Suspicious Data Exfiltration to Webhook.site via Command Line (via process_creation)

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
- T1567Exfiltration Over Web Service
Impact

What it detects

This rule detects PowerShell or curl reaching webhook.site, the exfiltration channel used by attackers after exploiting WSUS via CVE-2025-59287 to send reconnaissance output offsite. The free request-capture service receives whoami and network discovery results. Detecting this outbound call exposes staged data theft following server exploitation.

Reporting behind it

Related detections9 linkedT1059.001 — drag to rearrange

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Suspicious PowerShell Download Cradle via IEX and DownloadString (via process_creation)

Suspicious Data Exfiltration to Webhook.site via Command Line (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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