The answer is a recently modified file with a timestamp different from other files in the same directory, along with a file that accepts command parameters via GET or POST requests. Webshells are malicious scripts uploaded to a compromised server, and forensic investigators look for timestamps that are outliers because an attacker’s upload will often stand out against the bulk of static, unchanged files. Additionally, webshells are designed to receive and execute system commands, so they must parse input from HTTP requests—a behavior normal web pages rarely exhibit. On the CHFI exam, this question tests your ability to distinguish active compromise artifacts from benign anomalies; a common trap is assuming large file size is a reliable indicator, but webshells are often small and efficient. Remember the mnemonic “TAC” for Timestamp anomaly, Accepts commands, and Code injection—if a file shows two of these, treat it as a webshell until proven otherwise.
CHFI Application, Email and Cloud Forensics Practice Question
This CHFI practice question tests your understanding of application, email and cloud forensics. 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.
Which TWO of the following are indicators of a webshell on a web server? (Select TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The file contains system commands executed via GET or POST parameters
Webshells often have recent modification times out of sync with other files, and they typically accept command parameters in GET/POST requests. Large file size alone is not definitive, and missing index.html is unrelated.
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.
✗
A file named 'cmd.php' with a modification date matching other legitimate files
Why it's wrong here
If the date matches legitimate files, it's less suspicious.
✓
The file contains system commands executed via GET or POST parameters
Why this is correct
Webshells commonly execute commands from input parameters.
Related concept
Read the scenario before looking for a memorised answer.
✓
A recently modified file with a timestamp different from other files in the same directory
Why this is correct
Anomalous timestamps can indicate a web shell upload.
Related concept
Read the scenario before looking for a memorised answer.
✗
The server's index.html file is missing
Why it's wrong here
Missing index.html is not directly related to webshells.
✗
The file is over 1 MB in size
Why it's wrong here
Webshells are usually small; size alone is not a reliable indicator.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 CHFI 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 CHFI question in full detail.
Identify which CHFI exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Application, Email and Cloud Forensics — This question tests Application, Email and Cloud Forensics — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The file contains system commands executed via GET or POST parameters — Webshells often have recent modification times out of sync with other files, and they typically accept command parameters in GET/POST requests. Large file size alone is not definitive, and missing index.html is unrelated.
What should I do if I get this CHFI question wrong?
Identify which CHFI exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This CHFI 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 CHFI exam.
Question Discussion
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