The correct answer is that the file is authentic and has not been tampered with, because the SHA256 hash of the downloaded file exactly matches the vendor-provided hash. SHA256 is a one-way cryptographic hash function that produces a fixed 64-character hexadecimal output; even a single bit change in the file would produce a completely different hash, so a match confirms data integrity and that the file has not been altered. On the Certified Ethical Hacker CEH exam, this concept tests your understanding of file integrity verification and hash collision resistance—a common trap is confusing SHA256 with weaker algorithms like MD5, which are more vulnerable to collisions. Remember that SHA256 is part of the SHA-2 family and is the industry standard for verifying downloads in penetration testing and forensic analysis. Memory tip: think of a hash as a digital fingerprint—if the fingerprints match, the file is the same.
CEH Cryptography and Malware Analysis Practice Question
This CEH practice question tests your understanding of cryptography and malware analysis. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Exhibit
Refer to the exhibit.
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C:\> certutil -hashfile C:\Users\Admin\Downloads\update.exe SHA256
SHA256 hash of C:\Users\Admin\Downloads\update.exe:
4e7c2a8f9b3d1e5f6a0c8b7d2e3f4a5b6c7d8e9f0a1b2c3d4e5f6a7b8c9d0e1f
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Refer to the exhibit. An analyst suspects that the downloaded file 'update.exe' may have been tampered with. The vendor's official website lists the SHA256 hash as 4e7c2a8f9b3d1e5f6a0c8b7d2e3f4a5b6c7d8e9f0a1b2c3d4e5f6a7b8c9d0e1f. What should the analyst conclude?
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 authentic and has not been tampered with.
Option C is correct because the SHA256 hash provided by the vendor exactly matches the hash of the downloaded file. SHA256 is a cryptographically strong hash function that produces a fixed 256-bit (64-character hexadecimal) output. A matching hash confirms the file's integrity and authenticity, indicating it has not been tampered with.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 has been tampered with because the hash is from a different file.
Why it's wrong here
The hash actually matches the official hash, indicating no tampering.
✗
The SHA256 hash is not reliable; the analyst should use MD5 instead.
Why it's wrong here
SHA256 is cryptographically stronger than MD5 and is reliable for integrity verification.
✓
The file is authentic and has not been tampered with.
Why this is correct
The hash matches the official value, confirming integrity.
Related concept
Read the scenario before looking for a memorised answer.
✗
The file is malicious because the hash is too long.
Why it's wrong here
Hash length is not an indicator of maliciousness; the hash matches the expected value.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may mistakenly think a hash that matches is suspicious or that SHA256 is unreliable, when in fact a matching hash is the definitive proof of file integrity; the exam tests whether you understand that hash length and format are fixed and correct for SHA256.
Detailed technical explanation
How to think about this question
SHA256 is part of the SHA-2 family, producing a 256-bit digest that is computationally infeasible to reverse or find collisions for in practice. In real-world malware analysis, verifying a file's SHA256 hash against the vendor's published value is a standard first step to detect tampering, as even a single bit change in the file produces a completely different hash (avalanche effect). Tools like `certutil -hashfile` on Windows or `sha256sum` on Linux are commonly used for this purpose.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the CEH exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CEH question in full detail.
Cryptography and Malware Analysis — This question tests Cryptography and Malware Analysis — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The file is authentic and has not been tampered with. — Option C is correct because the SHA256 hash provided by the vendor exactly matches the hash of the downloaded file. SHA256 is a cryptographically strong hash function that produces a fixed 256-bit (64-character hexadecimal) output. A matching hash confirms the file's integrity and authenticity, indicating it has not been tampered with.
What should I do if I get this CEH question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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