Suspicious PowerShell Launched by MSIX StartingScriptWrapper From WindowsApps via Process Creation (via process_creation)

ATT&CK techniques

Execution

Recon
Resource Dev
Initial Access
Execution
- T1059.001PowerShell
- T1204.002Malicious File
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects the MSIX StartingScriptWrapper.ps1 launching PowerShell from the WindowsApps directory, the installer-driven execution vector Red Canary tracked across multiple malware delivery campaigns. Legitimate apps rarely use this wrapper to run scripts, so its appearance signals a malicious MSIX package executing embedded PowerShell during installation.

Reporting behind it

Related detections9 linkedT1059.001 — drag to rearrange

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Suspicious PowerShell Launched by MSIX StartingScriptWrapper From WindowsApps via Process Creation (via process_creation)

Pivot detection · T1059.001 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

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