GCFA Practice Question: Identification of Malicious and Normal Activity
A forensic analyst is reviewing a Windows 10 system and finds that a scheduled task named 'Updater' was created to run a PowerShell script every hour. The task's action is powershell.exe -WindowStyle Hidden -EncodedCommand <base64>. The task was created by a user account that normally does not perform administrative tasks. Which of the following best describes the forensic significance of this finding?
⚠ Common exam trap
The trap here is dismissing the finding because scheduled tasks are common, without recognizing that the specific flags and unusual creator account elevate it to a high-priority indicator of compromise.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The use of -EncodedCommand is a common obfuscation technique to hide malicious PowerShell code, and together with the hidden window and unusual creator, this strongly indicates persistence.
The combination of a scheduled task running PowerShell with an encoded command, a hidden window, and creation by a non-administrative user is a strong indicator of malicious persistence. Attackers use encoded commands to evade detection and scheduled tasks to maintain execution. This should be investigated by decoding the command and examining the task's XML for further clues.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
This is likely a legitimate software update mechanism, as many applications use scheduled tasks with hidden PowerShell for silent updates.
Why it's wrong here
While some legitimate software uses scheduled tasks, they typically do not use encoded commands with hidden windows, especially when created by a non-administrative user. The combination of a hidden window, encoded command, and unusual creator account is highly suspicious and not typical of standard update mechanisms.
- ✗
The task is likely a red herring because scheduled tasks cannot execute PowerShell scripts without administrative privileges.
Why it's wrong here
Scheduled tasks can execute PowerShell scripts under the context of the user who created them, and users can create tasks that run with their own privileges. Administrative rights are not required to create a task that runs a script, so this statement is incorrect. The task is not a red herring; it is a potential persistence mechanism.
- ✓
The use of -EncodedCommand is a common obfuscation technique to hide malicious PowerShell code, and together with the hidden window and unusual creator, this strongly indicates persistence.
Why this is correct
Attackers frequently use -EncodedCommand to obfuscate PowerShell payloads, and -WindowStyle Hidden to avoid detection. A scheduled task created by a non-administrative user that runs such a command hourly is a classic persistence mechanism. This finding warrants immediate investigation of the encoded command and the task's origin.
- ✗
The scheduled task is benign because it runs every hour, which is a common interval for legitimate system maintenance tasks.
Why it's wrong here
Hourly intervals are used by both legitimate and malicious tasks, so frequency alone is not an indicator of benign activity. The other characteristics, such as encoded command and hidden window, are far more telling. Assuming benign based on interval ignores the strong malicious indicators present.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official GIAC exam blueprint
This GCFA practice question is part of Courseiva's free GIAC 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 GCFA exam.