200-201 Host-Based Analysis Practice Question
When analyzing a suspicious PE file, the analyst calculates the file's entropy and finds it to be 7.8. What does a high entropy value typically indicate, and why is it relevant to malware analysis?
⚠ Common exam trap
Cisco often tests the misconception that high entropy always means the file is malicious, when in fact it only indicates obfuscation or packing—legitimate files can also be packed (e.g., some installers), so entropy must be combined with other indicators like suspicious imports or network signatures.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The file is likely packed or encrypted to evade signature-based detection.
A high entropy value (close to 8.0) indicates that the data within the file is highly random, which is a strong sign of packing or encryption. Malware authors use packers to obfuscate the original executable code, making it harder for signature-based detection engines to identify known malicious patterns. In malware analysis, entropy is a quick heuristic to flag files that may be hiding their true content.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The file is likely packed or encrypted to evade signature-based detection.
Why this is correct
Malware often uses packing to obfuscate code, resulting in high entropy.
- ✗
The file contains no executable code.
Why it's wrong here
High entropy does not indicate absence of code; it indicates randomness.
- ✗
The file is likely a legitimate application with high compression.
Why it's wrong here
Legitimate applications typically have lower entropy unless packed.
- ✗
The file's imports are all standard Windows DLLs.
Why it's wrong here
Entropy does not relate to import table contents.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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