The correct answer is PowerShell-based malware using encoded commands to evade detection. This is because Sysmon Event ID 1 reveals a process creation chain where a signed, trusted parent process spawns an unsigned child process whose command line includes 'powershell -EncodedCommand', a classic indicator of obfuscated malicious activity. Attackers encode their payloads in Base64 to bypass simple string-based detection, as PowerShell decodes and executes the hidden commands at runtime. On the Cisco CyberOps Associate 200-201 exam, this scenario tests your ability to correlate process ancestry with suspicious command-line artifacts in Sysmon logs—a common trap is assuming a signed parent guarantees the child is safe. Remember the memory tip: “Signed parent, unsigned child with EncodedCommand equals hidden malware.”
200-201 Host-Based Analysis Practice Question
This 200-201 practice question tests your understanding of host-based 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.
An analyst is reviewing Sysmon logs on a Windows host and sees Event ID 1 (process creation) with a signed parent process but an unsigned child. The child has a CommandLine that includes 'powershell -EncodedCommand'. What is the most likely threat?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
PowerShell-based malware using encoded commands to evade detection
Event ID 1 with a signed parent process and an unsigned child using 'powershell -EncodedCommand' strongly indicates PowerShell-based malware. Attackers use Base64-encoded commands to obfuscate malicious actions and bypass simple string-based detection, as the encoded payload is decoded and executed by PowerShell at runtime.
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.
✓
PowerShell-based malware using encoded commands to evade detection
Why this is correct
Encoded commands are a common obfuscation technique in PowerShell attacks.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Privilege escalation attempt
Why it's wrong here
Privilege escalation does not typically use encoded PowerShell commands.
✗
Process hollowing attack
Why it's wrong here
Process hollowing involves replacing legitimate process memory, not necessarily encoding.
✗
Phishing email attachment
Why it's wrong here
Phishing typically starts with an email, not necessarily encoded PowerShell.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between execution indicators (like encoded PowerShell commands) and other attack stages (like privilege escalation or process hollowing), leading candidates to confuse a common obfuscation technique with a different attack type.
Trap categories for this question
Command / output trap
Privilege escalation does not typically use encoded PowerShell commands.
Detailed technical explanation
How to think about this question
PowerShell's -EncodedCommand parameter accepts a Base64-encoded string that is decoded and executed, allowing attackers to hide commands from plain-text logs and simple signature-based detection. Sysmon Event ID 1 captures the full command line, but the encoded payload is not immediately readable without decoding. In real-world attacks, this technique is often used in fileless malware campaigns where the parent process (e.g., Microsoft Office or a browser) is signed, making the child process appear less suspicious.
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 junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Host-Based Analysis — This question tests Host-Based Analysis — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: PowerShell-based malware using encoded commands to evade detection — Event ID 1 with a signed parent process and an unsigned child using 'powershell -EncodedCommand' strongly indicates PowerShell-based malware. Attackers use Base64-encoded commands to obfuscate malicious actions and bypass simple string-based detection, as the encoded payload is decoded and executed by PowerShell at runtime.
What should I do if I get this 200-201 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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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