合格させちゃうCompTIA Cybersecurity Analyst CS0-003日本語試験簡単かつ正確なPDF問題 [2024年02月24日]
CS0-003日本語認証試験問題集解答を提供しています
質問 # 84
セキュリティ アナリストは、インフラストラクチャ チームが新しいパッチについてより迅速に情報を入手できるようにするサーバー パッチ管理ポリシーに取り組んでいます。脆弱性を迅速に修復するためにインフラストラクチャ チームが必要とする可能性が最も高いのは次のうちどれですか? (2 つ選択してください)。
- A. POC の可用性
- B. CVE の詳細
- C. ホスト名
- D. npm 識別子
- E. 場所
- F. KPI がありません
正解：B、E
解説：
CVE details and IoCs are information that would most likely be required by the infrastructure team so that vulnerabilities can be remediated quickly. CVE details provide the description, severity, impact, and solution of the vulnerabilities that affect the servers. IoCs are indicators of compromise that help identify and respond to potential threats or attacks on the servers. Reference: Server and Workstation Patch Management Policy, Section: Policy; Patch Management Policy: Why You Need One in 2024, Section: What is a patch management policy?
質問 # 85
セキュリティ アナリストがネットワーク上の脆弱性スキャンを実行しています。アナリストはスキャナ アプライアンスをインストールし、スキャンするサブネットを構成して、ネットワークのスキャンを開始します。次のうちどれ
この構成で実行されたスキャンでは欠落しますか?
- A. IPアドレス
- B. オペレーティング システムのバージョン
- C. ポートを開く
- D. レジストリキーの値
正解：D
解説：
Registry key values would be missing from a scan performed with this configuration, as the scanner appliance would not have access to the Windows Registry of the scanned systems. The Windows Registry is a database that stores configuration settings and options for the operating system and installed applications. To scan the Registry, the scanner would need to have credentials to log in to the systems and run a local agent or script. The other items would not be missing from the scan, as they can be detected by the scanner appliance without credentials. Operating system version can be identified by analyzing service banners or fingerprinting techniques. Open ports can be discovered by performing a port scan or sending probes to common ports. IP address can be obtained by resolving the hostname or using network discovery tools. https://attack.mitre.org/techniques/T1112/
質問 # 86
企業は、サードパーティから侵入テストレポートの概要を受け取ります。レポートの概要は、プロキシに適用する必要のあるいくつかのパッチがあることを示しています。プロキシはラック内にあり、実行されていません。
会社が新しいものに交換したため、使用されました。プロキシ上の脆弱性の CVE スコアは 9.8 です。企業がこのプロキシに関して従うべきベスト プラクティスは次のうちどれですか?
- A. プロキシはそのままにします。
- B. プロキシにパッチを適用します
- C. プロキシをクラウドに移行します。
- D. プロキシを廃止します。
正解：D
解説：
The best practice that the company should follow with this proxy is to decommission the proxy.
Decommissioning the proxy involves removing or disposing of the proxy from the rack and the network, as well as deleting or wiping any data or configuration on the proxy. Decommissioning the proxy can help eliminate the vulnerability on the proxy, as well as reduce the attack surface, complexity, or cost of maintaining the network. Decommissioning the proxy can also free up space or resources for other devices or systems that are in use or needed by the company.
質問 # 87
技術者は、PCI 監査用の一般的なネットワーク マッピング ツールからの出力を分析しています。
出力を最もよく説明しているのは次のうちどれですか?
- A. このホストの Secure Shell ポートが閉じられています
- B. ホストは過剰な暗号スイートを実行しています。
- C. ホストは安全でない暗号スイートを許可しています。
- D. ホストが起動していないか、応答していません。
正解：C
解説：
The output shows the result of running the ssl-enum-ciphers script with Nmap, which is a tool that can scan web servers for supported SSL/TLS cipher suites. Cipher suites are combinations of cryptographic algorithms that are used to establish secure communication between a client and a server. The output shows the cipher suites that are supported by the server, along with a letter grade (A through F) indicating the strength of the connection. The output also shows the least strength, which is the strength of the weakest cipher offered by the server. In this case, the least strength is F, which means that the server is allowing insecure cipher suites that are vulnerable to attacks or have been deprecated. For example, the output shows that the server supports SSLv3, which is an outdated and insecure protocol that is susceptible to the POODLE attack. The output also shows that the server supports RC4, which is a weak and broken stream cipher that should not be used. Therefore, the best description of the output is that the host is allowing insecure cipher suites. The other descriptions are not accurate, as they do not reflect what the output shows. The host is not up or responding is incorrect, as the output clearly shows that the host is up and responding to the scan. The host is running excessive cipher suites is incorrect, as the output does not indicate how many cipher suites the host is running, only which ones it supports. The Secure Shell port on this host is closed is incorrect, as the output does not show anything about port 22, which is the default port for Secure Shell (SSH). The output only shows information about port 443, which is the default port for HTTPS.
質問 # 88
セキュリティ チームは、最近のネットワーク スキャン中に、いくつかの不正な Wi-Fi アクセス ポイントを特定しました。ネットワーク スキャンは四半期に 1 回発生します。組織が不正デバイスをより迅速に特定するには、次の制御のうちどれが最適ですか?
- A. 継続的な監視ポリシーを実装します。
- B. ポータブル ワイヤレス スキャン ポリシーを実装します。
- C. BYOD ポリシーを実装します。
- D. ネットワーク スキャンの頻度を月に 1 回に変更します。
正解：A
解説：
The best control to allow the organization to identify rogue devices more quickly is A. Implement a continuous monitoring policy. A continuous monitoring policy is a set of procedures and tools that enable an organization to detect and respond to unauthorized or anomalous activities on its network in real time or near real time. A continuous monitoring policy can help identify rogue access points as soon as they appear on the network, rather than waiting for quarterly or monthly scans. A continuous monitoring policy can also help improve the overall security posture and compliance of the organization by providing timely and accurate information about its network assets, vulnerabilities, threats, and incidents1.
質問 # 89
システム アナリストは、Windows 環境でシステム構成キーと値へのユーザー アクセスを制限しています。アナリストがこれらの構成アイテムをどこで見つけられるかを説明しているものは次のうちどれですか?
- A. レジストリ
- B. 設定。イニ
- C. ntds.dit
- D. マスターブートレコード
正解：A
解説：
The correct answer is D. Registry.
The registry is a database that stores system configuration keys and values in a Windows environment. The registry contains information about the hardware, software, users, and preferences of the system. The registry can be accessed and modified using the Registry Editor tool (regedit.exe) or the command-line tool (reg.exe).
The registry is organized into five main sections, called hives, which are further divided into subkeys and values.
The other options are not the best descriptions of where the analyst can find system configuration keys and values in a Windows environment. config.ini (A) is a file that stores configuration settings for some applications, but it is not a database that stores system configuration keys and values. ntds.dit (B) is a file that stores the Active Directory data for a domain controller, but it is not a database that stores system configuration keys and values. Master boot record is a section of the hard disk that contains information about the partitions and the boot loader, but it is not a database that stores system configuration keys and values.
質問 # 90
.... を統合するダッシュボードを更新するために使用される可能性があるのは次のどれですか。
- A. Webhook
- B. 脅威フィードの組み合わせ
- C. JavaScript オブジェクト表記法
- D. 拡張マークアップ言語
正解：C
解説：
JavaScript Object Notation (JSON) is commonly used for transmitting data in web applications and would be suitable for updating dashboards that integrate various data sources. It's lightweight and easy to parse and generate.
質問 # 91
ある組織では、1 分以内に 10 回のログイン失敗が発生した場合にセキュリティ アナリスト配布リストにアラートを送信する SIEM ルールを有効にしました。ただし、コントロールは 9 回のログイン失敗による攻撃を検出できませんでした。何が起こったのかを最もよく表しているのは次のうちどれですか?
- A. 誤検知
- B. 真陰性
- C. 偽陰性
- D. 真陽性
正解：C
解説：
The correct answer is C. False negative.
A false negative is a situation where an attack or a threat is not detected by a security control, even though it should have been. In this case, the SIEM rule was unable to detect an attack with nine failed logins, which is below the threshold of ten failed logins that triggers an alert. This means that the SIEM rule missed a potential attack and failed to alert the security analysts, resulting in a false negative.
A false positive is a situation where a benign or normal activity is detected as an attack or a threat by a security control, even though it is not. A true negative is a situation where a benign or normal activity is not detected as an attack or a threat by a security control, as expected. A true positive is a situation where an attack or a threat is detected by a security control, as expected. These are not the correct answers for this question.
質問 # 92
セキュリティ アナリストは、侵害の可能性の間に発生したイベントを調査しています。アナリストは次のログを取得します。
ログ内のイベントに基づいて、発生している可能性が最も高いのは次のうちどれですか?
- A. 攻撃者が脆弱性スキャンを実行しています。
- B. 敵対者がパスワード スタッフィング攻撃を実行しています。
。 - C. 敵対者は最短の侵入経路を見つけようとしています。
- D. 敵対者が権限を昇格させています。
正解：A
解説：
.
Explanation:
Based on the events in the log, the most likely occurrence is that an adversary is performing a vulnerability scan. The log shows LDAP read operations and EDR enumerating local groups, which are indicative of an adversary scanning the system to find vulnerabilities or sensitive information. The final entry shows SMB connection attempts to multiple hosts from a single host, which could be a sign of network discovery or lateral movement. Reference: CompTIA CySA+ Study Guide: Exam CS0-003, 3rd Edition, Chapter 4: Security Operations and Monitoring, page 161; Monitor logs from vulnerability scanners, Section: Reports on Nessus vulnerability data.
質問 # 93
STIX および OpenloC 情報を人間とマシンの両方が読み取れるようにするものは次のうちどれですか?
- A. XML
- B. TAXII
- C. OVAL
- D. URL
正解：A
解説：
The correct answer is A. XML.
STIX and OpenloC are two standards for representing and exchanging cyber threat intelligence (CTI) information. STIX stands for Structured Threat Information Expression and OpenloC stands for Open Location and Identity Coordinates. Both standards use XML as the underlying data format to encode the information in a structured and machine-readable way. XML stands for Extensible Markup Language and it is a widely used standard for defining and exchanging data on the web. XML uses tags, attributes, and elements to describe the structure and meaning of the data. XML is also human-readable, as it uses plain text and follows a hierarchical and nested structure.
XML is not the only format that can be used to make STIX and OpenloC information readable by both humans and machines, but it is the most common and widely supported one. Other formats that can be used include JSON, CSV, or PDF, depending on the use case and the preferences of the information producers and consumers. However, XML has some advantages over other formats, such as:
XML is more expressive and flexible than JSON or CSV, as it can define complex data types, schemas, namespaces, and validation rules.
XML is more standardized and interoperable than PDF, as it can be easily parsed, transformed, validated, and queried by various tools and languages.
XML is more compatible with existing CTI standards and tools than other formats, as it is the basis for STIX 1.x, TAXII 1.x, MAEC, CybOX, OVAL, and others.
References:
1 Introduction to STIX - GitHub Pages
2 5 Best Threat Intelligence Feeds in 2023 (Free & Paid Tools) - Comparitech
3 What Are STIX/TAXII Standards? - Anomali Resources
4 What is STIX/TAXII? | Cloudflare
5 Sample Use | TAXII Project Documentation - GitHub Pages
6 Trying to retrieve xml data with taxii - Stack Overflow
7 CISA AIS TAXII Server Connection Guide
8 CISA AIS TAXII Server Connection Guide v2.0 | CISA
質問 # 94
セキュリティ アナリストは、侵害された可能性のあるマシンからの FTP セッションを含む Wireshark のパケット キャプチャを調査しています。アナリストは、表示フィルター ftp を設定します。アナリストは、226 転送完了応答を含む RETR リクエストがいくつかあることを確認できますが、パケット リスト ペインにはファイル転送自体を含むパケットが表示されません。アナリストがダウンロードしたファイルの内容全体を確認するには、次のどれを実行できますか?
- A. [ファイル] メニューに移動し、[オブジェクトのエクスポート] オプションから [FTP] を選択します。
- B. 表示フィルターを tcg.port=20 に変更します。
- C. 表示フィルタを f cp に変更します。積極的。細孔
- D. 表示フィルターを f cp-daca に変更し、TCP ストリームに従います。
正解：D
解説：
The best way to see the entire contents of the downloaded files in Wireshark is to change the display filter to ftp-data and follow the TCP streams. FTP-data is a protocol that is used to transfer files between an FTP client and server using TCP port 20. By filtering for ftp-data packets and following the TCP streams, the analyst can see the actual file data that was transferred during the FTP session
質問 # 95
違反を追跡および分析するプロセスを確立するときに、アラートの数を管理可能なレベルに保つためによく使用されるのは次のうちどれですか?
- A. しきい値
- B. ログの保存
- C. ログローテーション
- D. 最大ログサイズ
正解：A
解説：
A threshold value is a parameter that defines the minimum or maximum level of a metric or event that triggers an alert. For example, a threshold value can be set to alert when the number of failed login attempts exceeds
10 in an hour, or when the CPU usage drops below 20% for more than 15 minutes. By setting a threshold value, the process can filter out irrelevant or insignificant alerts and focus on the ones that indicate a potential problem or anomaly. A threshold value can help to reduce the noise and false positives in the alert system, and improve the efficiency and accuracy of the analysis12
質問 # 96
アナリストは、次のエントリを含むサーバー環境の脆弱性レポートをレビューしています。
次のシステムのうち、パッチ適用を最初に優先する必要があるのはどれですか?
- A. 54.74.110.26
- B. 54.74.110.228
- C. 10.101.27.98
- D. 54.73.225.17
正解：B
解説：
The system that should be prioritized for patching first is 54.74.110.228, as it has the highest number and severity of vulnerabilities among the four systems listed in the vulnerability report. According to the report, this system has 12 vulnerabilities, with 8 critical, 3 high, and 1 medium severity ratings. The critical vulnerabilities include CVE-2019-0708 (BlueKeep), CVE-2019-1182 (DejaBlue), CVE-2017-0144 (EternalBlue), and CVE-2017-0145 (EternalRomance), which are all remote code execution vulnerabilities that can allow an attacker to compromise the system without any user interaction or authentication. These vulnerabilities pose a high risk to the system and should be patched as soon as possible.
質問 # 97
最近の侵入テストでは、数人の従業員が電話で促されると特定の Web サイトにアクセスし、ダウンロードしたファイルを実行することで攻撃者を支援するよう誘導されていることが判明しました。この問題に最も適切に対処できるのは次のうちどれですか?
- A. 悪意のある Web サイトにアクセスできないようにする
- B. すべてのスタッフ メンバーがダウンロードしたアプリケーションを実行できないようにする
- C. インターネットからダウンロードされたすべてのスクリプトをブロックします。
- D. 全スタッフのトレーニングと意識の向上
正解：D
解説：
Increasing training and awareness for all staff is the best way to address the issue of employees being enticed to assist attackers by visiting specific websites and running downloaded files when prompted by phone calls. This issue is an example of social engineering, which is a technique that exploits human psychology and behavior to manipulate people into performing actions or divulging information that benefit the attackers. Social engineering can take many forms, such as phishing, vishing, baiting, quid pro quo, or impersonation. The best defense against social engineering is to educate and train the staff on how to recognize and avoid common social engineering tactics, such as:
Verifying the identity and legitimacy of the caller or sender before following their instructions or clicking on any links or attachments Being wary of unsolicited or unexpected requests for information or action, especially if they involve urgency, pressure, or threats Reporting any suspicious or anomalous activity to the security team or the appropriate authority Following the organization's policies and procedures on security awareness and best practices Official Reference:
https://partners.comptia.org/docs/default-source/resources/comptia-cysa-cs0-002-exam-objectives
https://www.comptia.org/certifications/cybersecurity-analyst
https://www.comptia.org/blog/the-new-comptia-cybersecurity-analyst-your-questions-answered
質問 # 98
Web アプリケーション チームは、公開 Web サーバー上に数千の HTTP/404 イベントがあることを SOC アナリストに通知しました。アナリストが次に取るべきステップは次のうちどれですか?
- A. イベントをインシデントにエスカレーションし、SOC マネージャーにアクティビティを通知します。
- B. この外部サーバーをブロックするにはルールを追加する必要があることをファイアウォール エンジニアに指示します。
- C. リクエストの IP/ホスト名を特定し、関連するアクティビティを確認します。
- D. DDoS 攻撃が発生していることをインシデント対応チームに通知します。
正解：C
解説：
A HTTP/404 error code means that the requested page or resource was not found on the web server. This could be caused by various reasons, such as incorrect URLs, moved or deleted pages, missing assets, or server misconfigurations123. The analyst should first identify the source of the requests and examine the related activity to determine if they are legitimate or malicious, and what actions need to be taken to resolve the issue.
The other options are either premature or irrelevant without further investigation. References: 1: 404 Page Not Found Error: What It Is and How to Fix It 2: 404 Error Code: What Causes Them and How To Fix It 3: About
404 errors and how to Troubleshoot it?
質問 # 99
セキュリティ アナリストは、特定のユーザーに対する複数の成功した MFA ログインに関するアラートを受け取りました。アナリストが認証ログを確認すると、次のことがわかります。
MFA ログに基づいて、発生している可能性が最も高いのは次のうちどれですか? (2 つ選択してください)。
- A. 不正なアクセス ポイント
- B. 辞書攻撃
- C. 不可能な地理速度
- D. パスワードスプレー
- E. 加入者 ID モジュールのスワッピング
- F. プッシュ フィッシング
正解：C、F
解説：
C) Impossible geo-velocity: This is an event where a single user's account is accessed from different geographical locations within a timeframe that is impossible for normal human travel. In the log, we can see that the user "jdoe" is accessing from the United States and then within a few minutes from Russia, which is practically impossible to achieve without the use of some form of automated system or if the account credentials are being used by different individuals in different locations.
B) Push phishing: This could also be an indication of push phishing, where the user is tricked into approving a multi-factor authentication request that they did not initiate. This is less clear from the logs directly, but it could be inferred if the user is receiving MFA requests that they are not initiating and are being approved without their genuine desire to access the resources.
質問 # 100
あなたの会社の約 100 人の従業員がフィッシングメールを受信しました。セキュリティアナリストとして。あなたにはこの状況に対処する任務が与えられています。
提供された情報を確認し、次のことを判断してください。
1. 何人の従業員がフィッシングメールのリンクをクリックしましたか?
2. マルウェアは何台のワークステーションにインストールされましたか?
3. マルウェアの実行ファイル名は何ですか?
正解：
解説：
see the answer in explanation for this task.
Explanation:
1. How many employees clicked on the link in the phishing email?
According to the email server logs, 25 employees clicked on the link in the phishing email.
2. On how many workstations was the malware installed?
According to the file server logs, the malware was installed on 15 workstations.
3. What is the executable file name of the malware?
The executable file name of the malware is svchost.EXE.
Answers
1. 25
2. 15
3. svchost.EXE
質問 # 101
インシデント中に、ネットワークのセグメント内のサーバーのグループで、ランサムウェア汚染の可能性のあるいくつかの場所が見つかりました。次に実行すべきステップは次のうちどれですか?
- A. 修復
- B. 再イメージ化
- C. 保存
- D. 分離
正解：D
解説：
Isolation is the first step to take after detecting some indicators of compromise (IoCs) of possible ransomware contamination. Isolation prevents the ransomware from spreading to other servers or segments of the network, and allows the security team to investigate and contain the incident. Isolation can be done by disconnecting the infected servers from the network, blocking the malicious traffic, or applying firewall rules12.
質問 # 102
次のセキュリティ運用タスクのうち、自動化に最適なものはどれですか?
- A. ファイアウォール IoC ブロック アクション:
最近公開されたゼロデイ エクスプロイトからの IoC のファイアウォール ログを調べます。 ログで見つかった動作をブロックするためにファイアウォールで緩和策を講じます。 ブロック ルールによって引き起こされた誤検知を追跡します。 - B. セキュリティ アプリケーション ユーザー エラー:
セキュリティ アプリケーションでユーザーが問題を抱えている兆候をエラー ログで検索します。 ユーザーの電話番号を調べます。 アプリケーションの使用に関する質問がある場合は、ユーザーに電話してください。 - C. 不審なファイルの分析:
フォルダー内で疑わしいグラフィックを探します。
見つかったグラフィックスのカテゴリに基づいて、元のフォルダーにサブフォルダーを作成します。
疑わしいグラフィックを適切なサブフォルダーに移動します - D. 電子メールヘッダー分析:
電子メールのヘッダーでフィッシング信頼度指標が 5 以上であるかどうかを確認します。 送信者のドメインをブロック リストに追加します。 電子メールを隔離に移動します。
正解：D
解説：
Email header analysis is one of the security operations tasks that are ideal for automation. Email header analysis involves checking the email header for various indicators of phishing or spamming attempts, such as sender address spoofing, mismatched domains, suspicious subject lines, or phishing confidence metrics. Email header analysis can be automated using tools or scripts that can parse and analyze email headers and take appropriate actions based on predefined rules or thresholds
質問 # 103
ログ分析フェーズ中に、次の不審なコマンドが検出されました。
次のうちどれが試みられていますか?
- A. バッファオーバーフロー
- B. スマーフの攻撃
- C. ICMPトンネリング
- D. RCE
正解：D
解説：
RCE stands for remote code execution, which is a type of attack that allows an attacker to execute arbitrary commands on a target system. The suspicious command in the question is an example of RCE, as it tries to download and execute a malicious file from a remote server using the wget and chmod commands. A buffer overflow is a type of vulnerability that occurs when a program writes more data to a memory buffer than it can hold, potentially overwriting other memory locations and corrupting the program's execution. ICMP tunneling is a technique that uses ICMP packets to encapsulate and transmit data that would normally be blocked by firewalls or filters. A smurf attack is a type of DDoS attack that floods a network with ICMP echo requests, causing all devices on the network to reply and generate a large amount of traffic. Verified References: What Is Buffer Overflow? Attacks, Types & Vulnerabilities - Fortinet1, What Is a Smurf Attack? Smurf DDoS Attack | Fortinet2, exploit - Interpreting CVE ratings: Buffer Overflow vs. Denial of ...3
質問 # 104
攻撃者が LAN 上の syslog サーバーにアクセスしたところです。syslog エントリを確認することで、攻撃者は次のターゲットとなる可能性のあるものに優先順位を付けることができます。これは次のどれに該当しますか?
- A. OS フィンガープリント
- B. パッシブネットワークフットプリント
- C. サービスポートの識別
- D. アプリケーションのバージョン管理
正解：B
解説：
Passive network foot printing is the best description of the example, as it reflects the technique of collecting information about a network or system by monitoring or sniffing network traffic without sending any packets or interacting with the target. Foot printing is a term that refers to the process of gathering information about a target network or system, such as its IP addresses, open ports, operating systems, services, or vulnerabilities. Foot printing can be done for legitimate purposes, such as penetration testing or auditing, or for malicious purposes, such as reconnaissance or intelligence gathering. Foot printing can be classified into two types: active and passive. Active foot printing involves sending packets or requests to the target and analyzing the responses, such as using tools like ping, traceroute, or Nmap. Active foot printing can provide more accurate and detailed information, but it can also be detected by firewalls or intrusion detection systems (IDS). Passive foot printing involves observing or capturing network traffic without sending any packets or requests to the target, such as using tools like tcpdump, Wireshark, or Shodan. Passive foot printing can provide less information, but it can also avoid detection by firewalls or IDS. The example in the question shows that the attacker has gained access to the syslog server on a LAN and reviewed the syslog entries to prioritize possible next targets. A syslog server is a server that collects and stores log messages from various devices or applications on a network. A syslog entry is a record of an event or activity that occurred on a device or application, such as an error, a warning, or an alert. By reviewing the syslog entries, the attacker can obtain information about the network or system, such as its configuration, status, performance, or security issues. This is an example of passive network foot printing, as the attacker is not sending any packets or requests to the target, but rather observing or capturing network traffic from the syslog server. The other options are not correct, as they describe different techniques or concepts. OS fingerprinting is a technique of identifying the operating system of a target by analyzing its responses to certain packets or requests, such as using tools like Nmap or Xprobe2. OS fingerprinting can be done actively or passively, but it is not what the attacker is doing in the example. Service port identification is a technique of identifying the services running on a target by scanning its open ports and analyzing its responses to certain packets or requests, such as using tools like Nmap or Netcat. Service port identification can be done actively or passively, but it is not what the attacker is doing in the example. Application versioning is a concept that refers to the process of assigning unique identifiers to different versions of an application, such as using numbers, letters, dates, or names. Application versioning can help to track changes, updates, bugs, or features of an application, but it is not related to what the attacker is doing in the example.
質問 # 105
セキュリティ アナリストは、会社のラップトップ上で不審なアクティビティに関するアラートを受け取ります。ログの抜粋を以下に示します。
次のうち、最も可能性が高いのはどれですか?
- A. 認証情報を盗む Web サイトにアクセスしました。
- B. 悪意のあるマクロを含む Office ドキュメントが開かれました。
- C. Web ブラウザの脆弱性が悪用されました。
- D. メール内のフィッシングリンクがクリックされた
正解：B
解説：
An Office document with a malicious macro was opened is the most likely explanation for the suspicious activity on the company laptop, as it reflects the common technique of using macros to execute PowerShell commands that download and run malware. A macro is a piece of code that can automate tasks or perform actions in an Office document, such as a Word file or an Excel spreadsheet. Macros can be useful and legitimate, but they can also be abused by threat actors to deliver malware or perform malicious actions on the system. A malicious macro can be embedded in an Office document that is sent as an attachment in a phishing email or hosted on a compromised website. When the user opens the document, they may be prompted to enable macros or content, which will trigger the execution of the malicious code. The malicious macro can then use PowerShell, which is a scripting language and command-line shell that is built into Windows, to perform various tasks, such as downloading and running malware from a remote URL, bypassing security controls, or establishing persistence on the system. The log excerpt shows that PowerShell was used to download a string from a URL using the WebClient.DownloadString method, which is a common way to fetch and execute malicious code from the internet. The log also shows that PowerShell was used to invoke an expression (iex) that contains obfuscated code, which is another common way to evade detection and analysis.
The other options are not as likely as an Office document with a malicious macro was opened, as they do not match the evidence in the log excerpt. A credential-stealing website was visited is possible, but it does not explain why PowerShell was used to download and execute code from a URL. A phishing link in an email was clicked is also possible, but it does not explain what happened after the link was clicked or how PowerShell was involved. A web browser vulnerability was exploited is unlikely, as it does not explain why PowerShell was used to download and execute code from a URL.
質問 # 106
ある企業がウェブサイトを改善するためにコンサルタントを雇います。コンサルタントが去った後。Web 開発者は、Web サイト上の異常なアクティビティに気づき、次のコードを含む不審なファイルをセキュリティ チームに送信します。
コンサルタントが行ったのは次のうちどれですか?
- A. Web サーバーにパッチを適用しました
- B. 権限昇格を実装しました
- C. クリックジャッキングを実装しました
- D. バックドアが埋め込まれています
正解：D
解説：
The correct answer is A. Implanted a backdoor.
A backdoor is a method that allows an unauthorized user to access a system or network without the permission or knowledge of the owner. A backdoor can be installed by exploiting a software vulnerability, by using malware, or by physically modifying the hardware or firmware of the device. A backdoor can be used for various malicious purposes, such as stealing data, installing malware, executing commands, or taking control of the system.
In this case, the consultant implanted a backdoor in the website by using an HTML and PHP code snippet that displays an image of a shutdown button and an alert message that says "Exit". However, the code also echoes the remote address of the server, which means that it sends the IP address of the visitor to the attacker. This way, the attacker can identify and target the visitors of the website and use their IP addresses to launch further attacks or gain access to their devices.
The code snippet is an example of a clickjacking attack, which is a type of interface-based attack that tricks a user into clicking on a hidden or disguised element on a webpage. However, clickjacking is not the main goal of the consultant, but rather a means to implant the backdoor. Therefore, option C is incorrect.
Option B is also incorrect because privilege escalation is an attack technique that allows an attacker to gain higher or more permissions than they are supposed to have on a system or network. Privilege escalation can be achieved by exploiting a software vulnerability, by using malware, or by abusing misconfigurations or weak access controls. However, there is no evidence that the consultant implemented privilege escalation on the website or gained any elevated privileges.
Option D is also incorrect because patching is a process of applying updates to software to fix errors, improve performance, or enhance security. Patching can prevent or mitigate various types of attacks, such as exploits, malware infections, or denial-of-service attacks. However, there is no indication that the consultant patched the web server or improved its security in any way.
References:
1 What Is a Backdoor & How to Prevent Backdoor Attacks (2023)
2 What is Clickjacking? Tutorial & Examples | Web Security Academy
3 What Is Privilege Escalation and How It Relates to Web Security | Acunetix
4 What Is Patching? | Best Practices For Patch Management - cWatch Blog
質問 # 107
ユーザーがマルウェアを含むソフトウェアをコンピュータにダウンロードすると、最終的に他の多数のシステムに感染します。ユーザーは次のうちどれになりましたか?
- A. 高度な持続的脅威
- B. インサイダーの脅威
- C. ハクリビスト
- D. スクリプトキディ
正解：B
解説：
The user has become an insider threat by downloading software that contains malware onto a computer that eventually infects numerous other systems. An insider threat is a person or entity that has legitimate access to an organization's systems, networks, or resources and uses that access to cause harm or damage to the organization. An insider threat can be intentional or unintentional, malicious or negligent, and can result from various actions or behaviors, such as downloading unauthorized software, violating security policies, stealing data, sabotaging systems, or collaborating with external attackers.
質問 # 108
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