Suspicious Non-Browser Access to Chromium Credential Stores

ATT&CK techniques

Cred Access

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

What it detects

This rule detects a process that is not a web browser touching the Local State and Login Data files inside a Chromium User Data directory. The ShadowCoil packed Python stealer read Chrome and Edge Local State (the encrypted master key) and Login Data SQLite databases and used DPAPI CryptUnprotectData to recover saved credentials. Attackers harvest browser-stored passwords to enable follow-on account takeover and ransomware operations.

Reporting behind it

Related detections9 linkedT1555.003 — drag to rearrange

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Suspicious Named Pipe ChromeDecryptIPC Used by Stealer (via pipe_created)

Suspicious Clipboard Data Access via Get-Clipboard (BeaverTail OtterCookie)

Malicious Edge Credential Parser Execution via PowerShell (via process_creation)

SapphireStealer Working Directory File Drop in Temp

Malicious RemusStealer Credential Exfiltration to pics TLD C2

Suspicious Non-Browser Access to Chromium Credential Stores

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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