The answer is process creation events for cmd.exe or powershell.exe spawned by w3wp.exe. This trio of artifacts is critical because a webshell on IIS typically executes system commands through the web server’s worker process, w3wp.exe, which then spawns a child process like cmd.exe or powershell.exe—an abnormal parent-child relationship that stands out in Windows Event Logs. On the CHFI exam, this tests your ability to correlate IIS logs, file system anomalies, and process creation events as part of a forensic timeline; a common trap is focusing only on HTTP request patterns in IIS logs while ignoring the event log evidence of command execution. Remember the memory tip: “W3 spawns CMD” to link the worker process to the command shell, and always check Event ID 4688 for process creation.
CHFI OS and Network Forensics Practice Question
This CHFI practice question tests your understanding of os and network 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.
A security analyst is investigating a potential webshell on an IIS server. Which THREE artifacts are commonly associated with webshell presence?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Presence of encoded scripts in the web application directory
Webshells leave traces in IIS logs (HTTP requests), file system (malicious files in web directories), and event logs (process creation or errors).
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.
✗
Increase in NetFlow traffic to a known good update server
Why it's wrong here
Traffic to a known good server is not suspicious.
✓
Presence of encoded scripts in the web application directory
Why this is correct
Webshell files are typically stored in web-accessible directories.
Related concept
Read the scenario before looking for a memorised answer.
✗
Event ID 4624 logon events from the service account
Why it's wrong here
Logon events are not directly related to webshell activity.
✓
Unusual HTTP POST requests to .asp or .aspx files in IIS logs
Why this is correct
Webshells often use POST to receive commands.
Related concept
Read the scenario before looking for a memorised answer.
✓
Process creation events for cmd.exe or powershell.exe spawned by w3wp.exe
Why this is correct
Webshells often execute system commands, spawning child processes.
Related concept
Read the scenario before looking for a memorised answer.
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.
OS and Network Forensics — This question tests OS and Network Forensics — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Presence of encoded scripts in the web application directory — Webshells leave traces in IIS logs (HTTP requests), file system (malicious files in web directories), and event logs (process creation or errors).
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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Question Discussion
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