CAS-004 Security Operations Practice Question
A security analyst is using the MITRE ATT&CK framework to categorize adversary behavior observed in recent incidents. The analyst notes that the adversary used spearphishing with a malicious attachment to gain initial access, then executed a PowerShell script to download additional tools. Which ATT&CK tactic is the PowerShell execution associated with?
⚠ Common exam trap
The trap is conflating the *initial access vector* (spearphishing) with the *post-compromise action* (PowerShell execution) — candidates see 'spearphishing' in the scenario and reflexively choose Initial Access.
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
✓
Execution
In MITRE ATT&CK, Execution (TA0002) covers techniques that result in adversary-controlled code running on a local or remote system, including T1059 Command and Scripting Interpreter. PowerShell is explicitly documented under T1059.001, so running a PowerShell script to download tools is classified as Execution. Initial Access describes how the adversary got in (the spearphishing), not what they ran afterward.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Defense Evasion
Why it's wrong here
Defense Evasion covers techniques that avoid detection, such as obfuscation or disabling security tools. The stem describes PowerShell downloading additional tools, which maps to Execution. Defense Evasion would be correct if the script were obfuscated or used to impair defences.
- ✓
Execution
Why this is correct
PowerShell running a script to download tools is adversary-controlled code running on the victim host, which maps to the Execution tactic. Initial access was already achieved via spearphishing; the script's purpose is to execute further payloads, satisfying the stem's requirement to categorise this behaviour.
- ✗
Initial Access
Why it's wrong here
Initial Access covers the adversary's entry vector, which here is the spearphishing attachment. The PowerShell execution occurs after that foothold is established, so it maps to Execution. Initial Access would be the answer if the question asked about the phishing email itself.
- ✗
Command and Control
Why it's wrong here
Command and Control covers adversary communication with compromised systems, such as beaconing to C2 infrastructure. Here PowerShell downloads additional tooling, which is Execution under ATT&CK. Command and Control would fit if the script established a channel to an external server for tasking.
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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 CompTIA exam blueprint
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