300-215 Question 23
Single answerDuring a forensic analysis of a compromised server, you encounter a suspicious PowerShell script. The script contains a string that appears to be encoded. Upon further inspection, you find that the string has a format similar to 'U29tZSBzZWNyZXQgbWVzc2FnZQ=='. What encoding technique is most likely being used, and what would be an appropriate next step to analyze the script?
- A
Base64 encoding; decode the string using a Base64 decoder to reveal its contents.
- B
Hex encoding; convert the string from hexadecimal to ASCII to understand its purpose.
- C
Polymorphic coding; analyze the script for dynamically generated code patterns.
- D
Metamorphic coding; look for variations of the script that maintain the same functionality.
Show answer and explanation
Correct answer: A
Explanation
The suspicious string 'U29tZSBzZWNyZXQgbWVzc2FnZQ==' is an example of Base64 encoding, which is commonly used to obfuscate data in scripts or malware. Decoding the string is a crucial step in understanding its contents and further investigating its purpose in the script. Recognizing encoding techniques like Base64 is essential for conducting effective forensic analysis and incident response.
- A. Correct.
This is the correct option because 'U29tZSBzZWNyZXQgbWVzc2FnZQ==' matches the format of Base64 encoding. The next step would be to decode it using a Base64 decoder to reveal its contents.
- B. Incorrect.
This is incorrect because the string provided does not match the typical format of hex encoding, which represents data as hexadecimal digits.
- C. Incorrect.
This is incorrect because polymorphic coding refers to malware that dynamically generates new code to avoid signature detection, which is unrelated to the observed encoding.
- D. Incorrect.
This is incorrect because metamorphic coding involves malware rewriting its own code while maintaining the same functionality, which is not applicable to the given encoded string.