300-215 Question 22
Single answerDuring a forensic investigation, you encounter a suspicious PowerShell script that includes a long string of characters. Upon further inspection, you notice the string ends with '==' and contains only alphanumeric characters and slashes ('/'). What is the most likely encoding or obfuscation technique used in this script?
- A
Base64 encoding
- B
Hex encoding
- C
Polymorphic coding
- D
Metamorphic coding
Show answer and explanation
Correct answer: A
Explanation
The characteristics of the string ('==' at the end and alphanumeric characters with slashes) strongly indicate Base64 encoding. Base64 is a common encoding technique used to obfuscate data in scripts, making it less human-readable while still being easily decoded during execution. Recognizing these patterns is crucial for identifying and analyzing obfuscated data during forensic investigations.
- A. Correct.
Base64 encoding is commonly identified by the presence of '=' or '==' padding at the end of its encoded string, and it uses only alphanumeric characters and slashes. This is a widely used encoding technique to obscure data in scripts.
- B. Incorrect.
Hex encoding represents data as hexadecimal digits (0-9 and A-F) and does not typically include '=' or '==' padding. This does not match the characteristics of the string described.
- C. Incorrect.
Polymorphic coding refers to malware that changes its code to avoid detection but does not specifically relate to a string format such as the one described in the scenario.
- D. Incorrect.
Metamorphic coding is similar to polymorphic coding in that it involves variations in malicious code but does not involve encoding techniques like Base64.