Malicious PowerShell Exfiltration to webhook.site Following WSUS Exploitation

ATT&CK techniques

Execution → Exfiltration

Recon
Resource Dev
Initial Access
Execution
- T1059.001PowerShell
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
- T1041Exfiltration Over C2 Channel
Impact

What it detects

This rule detects PowerShell using Invoke-WebRequest to PUT data to the webhook.site service, the exfiltration channel observed after Windows Server Update Services remote code execution. Attackers stage discovery output and upload it to a disposable webhook endpoint for collection. Outbound PUT requests to webhook.site from PowerShell are a strong exfiltration indicator.

Reporting behind it

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Malicious PowerShell Exfiltration to webhook.site Following WSUS Exploitation

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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