Suspicious Browser Remote Debugging Port Cookie Theft via process_creation

ATT&CK techniques

Cred Access

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
- T1539Steal Web Session Cookie
- T1555.003Credentials from Web Browsers
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects a Chromium based browser launched with the remote-debugging-port switch which attackers use to attach to the browser and steal cookies and session tokens without triggering DPAPI prompts. The Arcane stealer opened browsers with a remote debugging port to harvest authentication cookies. This technique bypasses cookie encryption so unexpected debugging launches warrant investigation.

Reporting behind it

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Suspicious Browser Remote Debugging Port Cookie Theft via process_creation

Pivot detection · T1555.003 · 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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