200-201 Question 31
Select 4A cybersecurity analyst is tasked with investigating a suspicious executable file found on a company workstation. They decide to use reverse engineering to analyze the file. During the reverse engineering process, which of the following activities would be most appropriate to uncover the file's behavior and potential threats?
- A
Disassembling the executable code to analyze its instructions
- B
Running the file in a sandbox environment to observe its runtime behavior
- C
Scanning the file with antivirus software to detect known signatures
- D
Using a debugger to trace the file's execution flow
- E
Examining network traffic generated by the file during execution
- F
Decrypting the file to access its source code
Show answer and explanation
Correct answers: A, B, D, E
Explanation
Reverse engineering involves both static and dynamic analysis techniques to understand the behavior and functionality of a file. Key steps include disassembling the code, using a debugger, running the file in a controlled environment (sandbox), and monitoring its network activity. These techniques provide comprehensive insights into the file's potential threats, whereas basic detection methods like antivirus scans or actions like decryption are outside the typical scope of reverse engineering.
- A. Correct.
Disassembling the executable code is a key step in reverse engineering as it allows the analyst to examine the low-level instructions and understand the program's logic.
- B. Correct.
Running the file in a sandbox environment is a safe way to observe its behavior dynamically, such as changes to the system or network activity, without risking harm to the actual system.
- C. Incorrect.
Scanning the file with antivirus software is not specific to reverse engineering. It is a basic detection technique and does not involve in-depth analysis of the file's behavior or code.
- D. Correct.
Using a debugger to trace the execution flow helps the analyst understand the program's operations step by step, providing valuable insights into its functionality and potential malicious actions.
- E. Correct.
Examining network traffic generated by the file during execution can reveal malicious communications, such as data exfiltration or command-and-control traffic, which is a critical part of dynamic analysis in reverse engineering.
- F. Incorrect.
Decrypting the file to access its source code is not a standard step in reverse engineering. Reverse engineering typically involves working with compiled code, as source code is often unavailable.