300-215 Question 25
Select 2During a forensic investigation, you come across a suspicious script file that appears to be encoded. Upon examining the file, you observe strings such as 'U2FsdGVkX1+...' and '0x4D616C'. Which of the following encoding or obfuscation techniques could be used in this context to hide malicious code?
- A
Base64 encoding
- B
Hexadecimal encoding
- C
Polymorphic coding
- D
Metamorphic coding
- E
ROT13 encoding
- F
URL encoding
Show answer and explanation
Correct answers: A, B
Explanation
The strings 'U2FsdGVkX1+' and '0x4D616C' are indicative of Base64 and hexadecimal encoding, respectively. These techniques are commonly used to obfuscate data or hide malicious code in files. Understanding different encoding techniques is crucial during forensic analysis to identify and decode potentially harmful content.
- A. Correct.
Base64 encoding is a common method for encoding binary data into a text format. The 'U2FsdGVkX1+' string resembles Base64 encoded data.
- B. Correct.
Hexadecimal encoding represents binary data in a hexadecimal format. The '0x4D616C' string indicates the use of hexadecimal encoding.
- C. Incorrect.
Polymorphic coding refers to malware that changes its appearance using encryption or obfuscation but retains its core functionality. This is unrelated to the specific encoding patterns observed here.
- D. Incorrect.
Metamorphic coding involves malware rewriting its own code to avoid detection, which is unrelated to the observed strings.
- E. Incorrect.
ROT13 encoding is a substitution cipher that shifts letters by 13 places. While it's an encoding method, the strings in the question do not resemble ROT13 encoding.
- F. Incorrect.
URL encoding is used for encoding special characters in URLs. The observed strings do not follow URL encoding patterns.