Quick Answer
The answer is Anti-VM / sandbox evasion. This technique is correct because malware often checks the number of CPU cores to distinguish a real user’s system from a lightweight analysis environment; virtual machines and sandboxes are frequently configured with a single core to conserve resources, so a core count below two triggers the malware to terminate execution and avoid detection. On the Certified Ethical Hacker CEH exam, this concept tests your understanding of how attackers exploit environmental artifacts—like CPU core count, RAM size, or disk space—to evade forensic tools. A common trap is confusing this with anti-debugging or obfuscation, but remember: anti-VM checks target the host’s hardware profile, not the debugger’s behavior. Memory tip: “One core, no more—malware hits the floor.”
This CEH practice question tests your understanding of cryptography and malware analysis. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
During a forensic investigation, an analyst finds that a malware sample uses a technique to detect if it is running in a sandbox by checking the number of CPU cores. The malware terminates execution if the core count is less than 2. Which anti-analysis technique is this?
Code obfuscation
Why wrong: Obfuscation makes code hard to read, not detection.
Anti-debugging
Why wrong: Anti-debugging detects debugger attachment, not system resources.
Anti-VM / sandbox evasion
Checking for low resource counts is a common sandbox evasion technique.
Packing
Why wrong: Packing compresses the executable to evade signature detection.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Anti-VM / sandbox evasion
Option C is correct because checking the number of CPU cores is a classic anti-VM/sandbox evasion technique. Virtual machines and sandboxes often allocate minimal resources (e.g., a single core) to remain lightweight, so malware uses this check to detect an analysis environment and terminate execution to avoid detection.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Code obfuscation
Why it's wrong here
Obfuscation makes code hard to read, not detection.
Anti-debugging
Why it's wrong here
Anti-debugging detects debugger attachment, not system resources.
Anti-VM / sandbox evasion
Why this is correct
Checking for low resource counts is a common sandbox evasion technique.
Related concept
Read the scenario before looking for a memorised answer.
Packing
Why it's wrong here
Packing compresses the executable to evade signature detection.
Common exam traps
EC-Council often tests the distinction between anti-debugging and anti-VM techniques; the trap here is that candidates confuse resource-based checks (like CPU cores) with debugger detection, but anti-debugging specifically targets debugger artifacts, not hardware resource enumeration.
Detailed technical explanation
Under the hood, malware can query the number of CPU cores via Windows API calls like GetSystemInfo (which returns a SYSTEM_INFO structure with dwNumberOfProcessors) or by reading the CPUID instruction. In real-world scenarios, advanced malware may combine this with checks for low RAM, small hard disk size, or the presence of analysis tools (e.g., Wireshark, Process Monitor) to evade sandboxes like Cuckoo or Joe Sandbox.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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FAQ
Cryptography and Malware Analysis — This question tests Cryptography and Malware Analysis — Read the scenario before looking for a memorised answer..
The correct answer is: Anti-VM / sandbox evasion — Option C is correct because checking the number of CPU cores is a classic anti-VM/sandbox evasion technique. Virtual machines and sandboxes often allocate minimal resources (e.g., a single core) to remain lightweight, so malware uses this check to detect an analysis environment and terminate execution to avoid detection.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This CEH practice question is part of Courseiva's free EC-Council certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CEH exam.
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