Suspicious PowerShell WebClient DownloadFile of Archive Payload (UAT-7237)

ATT&CK techniques

Execution

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

What it detects

This rule detects PowerShell using the System.Net.WebClient DownloadFile method to retrieve a remote archive payload. UAT-7237 uses this technique to stage tooling including SoftEther VPN packaged as a RAR archive for persistence. Scripted downloads of archives via WebClient are a common malware staging behavior.

Reporting behind it

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Suspicious PowerShell WebClient DownloadFile of Archive Payload (UAT-7237)

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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