CompTIA SecurityX (CAS-005)Security OperationsMedium
A security team is performing a post-incident analysis after a targeted attack. They suspect the attacker used a zero-day vulnerability to gain initial access. To understand the full scope of the compromise and prevent future similar attacks, they need to identify the specific vulnerability and the exploit used. Which type of analysis would be most effective in determining the exact nature of the zero-day exploit?
- AMalware reverse engineering
- BLog analysis of SIEM events
- CVulnerability scanning
- DNetwork traffic analysis with a sniffer
Show answer & explanationAnswer & explanation
Correct answer: A. Malware reverse engineering
To understand the exact nature of a zero-day exploit, especially if a custom payload or attack vector was used, reverse engineering the malware or exploit code itself is often the most effective method. This allows for detailed inspection of its functionality, targets, and methods.
Why the other options are wrong
- B. Log analysis provides indicators of compromise but may not reveal the specific zero-day vulnerability or exploit details without prior signatures.
- C. Vulnerability scanning identifies known vulnerabilities, but a zero-day is by definition unknown to scanners.
- D. Network traffic analysis can show communication patterns and payloads but might be encrypted or obfuscated, making it difficult to pinpoint the exact zero-day exploit without context.
Malware Reverse Engineering
The process of analyzing malicious software to understand its functionality, origin, potential impact, and how it exploits systems. This often involves disassembling code, debugging, and observing its behavior in a controlled environment.
- Deconstructs malicious code.
- Reveals exploit mechanisms and C2 protocols.
- Essential for understanding zero-day attacks.
Memory trick: To Dissect a Zero-Day, You Must Reverse Engineer the Code.