The correct answer is to correlate web access logs, file timestamps, process execution, and outbound connections from the web service account. This combination is definitive because a web shell is typically uploaded via a malicious HTTP request—visible in access logs—and its creation alters file timestamps; once executed, it spawns child processes like cmd.exe or PowerShell, which are captured by Sysmon or process auditing, and it often initiates outbound connections for C2 or data exfiltration, logged by firewalls or netstat. On the CompTIA CySA+ CS0-003 exam, this question tests your ability to apply the NIST SP 800-61 incident-response methodology, which emphasizes multi-source correlation over relying on a single log. A common trap is to pick only web logs or only file timestamps, but the exam expects you to recognize that confirming a web shell requires evidence of the entire attack chain. Memory tip: think “L-T-P-O” for Logs, Timestamps, Processes, Outbound—the four pillars of web shell confirmation.
CS0-003 Incident Response and Management Practice Question
This CS0-003 practice question tests your understanding of incident response and management. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
After a high-priority SOC escalation, a web server contains a new file that executes commands through a query parameter. What evidence best confirms web-shell activity? During recovery, which decision is most defensible? which response best matches incident-response practice?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Why wrong: Printer logs are unrelated to web-shell behaviour.
B
Only the CEO's mailbox audit events
Why wrong: Mailbox events do not confirm server-side command execution.
C
Web access logs, file timestamps, process execution, and outbound connections from the web service account
A web shell leaves evidence across file, web, process, and network telemetry. In recovery, responders need action that reduces risk while preserving the investigation record.
D
Only SSL certificate metadata
Why wrong: Certificate data does not show command execution.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Web access logs, file timestamps, process execution, and outbound connections from the web service account
Option C is correct because web-shell activity requires correlating multiple evidence sources: web access logs show the initial malicious request (e.g., a POST to a PHP file with a query parameter like `?cmd=whoami`), file timestamps confirm when the shell was created, process execution logs (e.g., Sysmon Event ID 1) reveal the spawned child processes (e.g., cmd.exe, powershell.exe), and outbound connections from the web service account (e.g., netstat or firewall logs) indicate command-and-control (C2) or data exfiltration. This multi-source correlation aligns with the NIST SP 800-61 incident-response methodology for validating a compromise.
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.
✗
Only printer logs
Why it's wrong here
Printer logs are unrelated to web-shell behaviour.
✗
Only the CEO's mailbox audit events
Why it's wrong here
Mailbox events do not confirm server-side command execution.
✓
Web access logs, file timestamps, process execution, and outbound connections from the web service account
Why this is correct
A web shell leaves evidence across file, web, process, and network telemetry. In recovery, responders need action that reduces risk while preserving the investigation record.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Only SSL certificate metadata
Why it's wrong here
Certificate data does not show command execution.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that a single log source (like web access logs alone) is sufficient to confirm a web shell, when in fact incident-response best practice requires correlating multiple evidence types (file, process, network) to rule out false positives and establish a complete attack chain.
Trap categories for this question
Command / output trap
Mailbox events do not confirm server-side command execution.
Detailed technical explanation
How to think about this question
Under the hood, a web shell typically executes via the web server's process (e.g., w3wp.exe on IIS or apache2 on Linux), spawning child processes like cmd.exe or bash. Sysmon Event ID 1 captures these process creations with parent-child relationships, while Windows Event ID 4688 or Linux auditd logs can also track command-line arguments. Outbound connections from the web service account (e.g., port 443 or 80) to an external IP are often logged by firewall or EDR solutions, and correlating these with the exact timestamp of the web access log entry (e.g., HTTP 200 response to a suspicious URI) provides definitive proof of compromise.
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 developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CS0-003 question in full detail.
Incident Response and Management — This question tests Incident Response and Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Web access logs, file timestamps, process execution, and outbound connections from the web service account — Option C is correct because web-shell activity requires correlating multiple evidence sources: web access logs show the initial malicious request (e.g., a POST to a PHP file with a query parameter like `?cmd=whoami`), file timestamps confirm when the shell was created, process execution logs (e.g., Sysmon Event ID 1) reveal the spawned child processes (e.g., cmd.exe, powershell.exe), and outbound connections from the web service account (e.g., netstat or firewall logs) indicate command-and-control (C2) or data exfiltration. This multi-source correlation aligns with the NIST SP 800-61 incident-response methodology for validating a compromise.
What should I do if I get this CS0-003 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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