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問題 #89
An incident responder reviews a log entry that shows a Microsoft Word process initiating an outbound network connection followed by PowerShell execution with obfuscated commands. Considering the machine's role in a sensitive data department, what is the most critical action for the responder to take next to analyze this output for potential indicators of compromise?
答案：B
解題說明：
When dealing with suspected malicious activity involving obfuscated PowerShell scripts-especially when launched from Microsoft Word documents-behavioral analysis is the most critical next step. This approach helps in determining if the process chain is part of a known attack pattern, such as a phishing attempt using malicious macros that launch PowerShell for data exfiltration or payload download.
As highlighted in theCyberOps Technologies (CBRFIR) 300-215 study guide, understanding behavior and deobfuscating PowerShell scripts is an essential part of the forensic and incident response process.
Specifically:
* During the detection and analysis phase, if PowerShell is used with obfuscated or encoded commands, responders should investigate the intent and behavior of the command.
* Deobfuscation allows analysts to see what the script is doing (e.g., downloading files, creating persistence mechanisms, or opening a reverse shell).
The guide states:
"For example, if the threat is malware, the compromised system should be immediately isolated and the malware should be placed in a sandbox or a detonation chamber to understand what it is trying to do".
This confirms that understanding execution behavior (such as what the PowerShell script intends to perform) is key to uncovering indicators of compromise (IoCs).
Thus, option C-conducting a behavioral analysis and deobfuscating PowerShell-is the most critical and effective response at this stage.
問題 #90
Which tool is used for reverse engineering malware?
答案：A
解題說明：
Explanation/Reference: https://www.nsa.gov/resources/everyone/ghidra/#:~:text=Ghidra%20is%20a%20software%
20reverse,in%20their%20networks%20and%20systems.
問題 #91 
答案：A
解題說明：
This Python script uses a combination of libraries (urllib, zlib, base64, and ssl) to:
* Disable SSL certificate verification (ssl.CERT_NONE and check_hostname=False).
* Construct a custom HTTPS opener with the specified SSL context.
* Add a forged User-Agent header to mimic Internet Explorer 11.
* Connect to the URL https://23.1.4.14:8443.
* Download and execute base64-encoded and zlib-compressed content from that URL using:
exec(zlib.decompress(base64.b64decode(...).read()))
This shows a classic example of:
* Downloading payloads from a remote server (23.1.4.14:8443).
* Avoiding detection by disabling SSL verification.
* Executing the payload dynamically with exec() after decoding and decompressing.
The main goal is clearly to initiate a connection to a remote command-and-control (C2) server on port 8443 and download/execute additional code.
Hence, the correct answer is: A. Initiate a connection to 23.1.4.14 over port 8443.
問題 #92
Refer to the exhibit.
What is occurring?
答案：C
解題說明：
Comprehensive and Detailed Explanation:
The log entry contains the following key elements:
* The timestamp:(04/Jan/2022:20:18:06 +0000)
* HTTP method and URI:"GET /%60%60%60%60%60%60/ HTTP/2.0"
* HTTP status code:404
* User-Agent:Mozilla/5.0 ... Firefox/95.0
The status code404indicates that the requested resource was not found on the server. This is a standard HTTP response that signifies the server could not locate the requested URI (in this case, likely due to a malformed or invalid path/\`````/, where%60is the URL-encoded form of the backtick character "").
There is no clear evidence of SQL injection, WAF detection, or redirection in this log. The use of encoded backticks may suggest probing behavior, but the log does not show a definitive attack signature.
Therefore, the correct interpretation is:
D: The requested page was not found.
問題 #93
Refer to the exhibit.
A web hosting company analyst is analyzing the latest traffic because there was a 20% spike in server CPU usage recently. After correlating the logs, the problem seems to be related to the bad actor activities. Which attack vector is used and what mitigation can the analyst suggest?
答案：D
解題說明：
Comprehensive and Detailed Explanation:
The log entries show repeated SSH login attempts for various invalid usernames (e.g., admin, phoenix, rainbow, test, user, etc.) from different source ports. These are clear signs of a brute-force attack-an automated process trying multiple usernames and passwords in hopes of gaining access.
Mitigating such attacks includes:
* Implementing account lockout policies (e.g., locking an account after several failed login attempts).
* Enabling Multi-Factor Authentication (MFA) to ensure that password guessing alone is insufficient for account access.
Therefore, the correct answer is:
D). Brute-force attack; implement account lockout policies and roll out MFA.
問題 #94
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