Suspicious Access To Chrome Credential Files

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 read access to the Google Chrome Local State, Cookies and Login Data files by a process other than Chrome, captured via a SACL file audit and Security event 4663. In the WithSecure Windows Lab 4 tooling such as Chlonium or Mimikatz reads these files to steal the DPAPI master key and decrypt session cookies and stored passwords. Attackers harvest browser credentials and session tokens for account takeover.

Reporting behind it

Related detections9 linkedT1555.003 — drag to rearrange

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Malicious Interlock Credential Stealer Output File

Malicious Browser Master Key Decryption Artifacts Written by Katz Stealer (via file_event)

Uncommon Browser Launched with Remote Debugging Port for Cookie Theft (via process_creation)

Suspicious AppleScript Payload Execution via osascript (macOS)

Suspicious Access To Chrome Credential Files

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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