Suspicious PowerShell Download Cradle with Spoofed User-Agent via MSIX

ATT&CK techniques

Execution → C2

Recon
Resource Dev
Initial Access
Execution
- T1059.001PowerShell
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
- T1105Ingress Tool Transfer
Exfiltration
Impact

What it detects

This rule detects a PowerShell download cradle that fetches and executes remote content while presenting a spoofed browser User-Agent string. A malicious MSIX package runs an obfuscated startup script that combines Invoke-WebRequest and Invoke-Expression to pull a next stage from an attacker server.

Reporting behind it

Related detections9 linkedT1059.001 — drag to rearrange

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Malicious Silver Fox PowerShell Download Cradle via irm and iex (via process_creation)

Malicious DAEMON Tools Supply Chain Payload Download via PowerShell WebClient (via process_creation)

Suspicious PowerShell Remote File Download Cmdlets (via ps_script)

Suspicious PowerShell Download Cradle Writing Executable To Windows Temp

Suspicious PowerShell Download Cradle with Spoofed User-Agent via MSIX

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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