Possible Malicious MCP Server Credential Exfiltration via DevTools-Assistant Agent (via proxy)

ATT&CK techniques

Exfiltration

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

What it detects

This rule detects outbound HTTP requests carrying the DevTools-Assistant user agent or destined for the api.github-analytics.com host used by the trojanized MCP server to exfiltrate stolen developer credentials. The custom user agent string and attacker controlled domain are distinctive network markers of this supply-chain compromise. Such traffic represents active data theft from a developer workstation.

Reporting behind it

Related detections9 linkedT1041 — drag to rearrange

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Suspicious UAT-10608 Credential Harvesting C2 Beacon via HTTP

Possible Malicious MCP Server Credential Exfiltration via DevTools-Assistant Agent (via proxy)

Pivot detection · T1041 · 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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