Suspicious Credential Exfiltration to webhook.site (via dns_query)

ATT&CK techniques

Cred Access → Exfiltration

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
- T1552.001Credentials In Files
Discovery
Lateral Movement
Collection
C2
Exfiltration
- T1567Exfiltration Over Web Service
Impact

What it detects

This rule detects DNS resolution of webhook.site, the request-catcher service abused by the Shai-Hulud npm worm to exfiltrate stolen .npmrc, cloud and SSH tokens. Enterprise hosts rarely need this testing service, so a lookup from a build or developer machine is a strong exfiltration signal.

Reporting behind it

Related detections9 linkedT1552.001 — drag to rearrange

Suspicious Access to Cloud and Database Credential Files via Process

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Suspicious HTTP POST to Local AI Malware Exfil Endpoint (via proxy)

Suspicious prt-scan Campaign Credential Harvesting via proc environ Scan (via process_creation)

Possible Stolen AWS Credential Validation via STS GetCallerIdentity

Malicious Mini Shai-Hulud TanStack C2 git-tanstack and getsession (via dns_query)

Suspicious Double Base64 Decoded Payload Piped to Shell in CI (reviewdog Supply Chain)

Malicious Winlogon Automatic Logon Persistence via Registry AutoAdminLogon (via process_creation)

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

Suspicious Credential Exfiltration to webhook.site (via dns_query)

Pivot detection · T1552.001 · 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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