Malicious Browser Credential Dump File Drop by Phantom Stealer via file_event

ATT&CK techniques

Cred Access → Collection

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
- T1555.003Credentials from Web Browsers
Discovery
Lateral Movement
Collection
- T1005Data from Local System
C2
Exfiltration
Impact

What it detects

This rule detects creation of files named Chromium_passwords_<host>.txt, the browser credential dump written by the multi-stage Phantom Stealer campaign after harvesting saved logins. The predictable filename marks the collection stage where stolen Chromium passwords are staged for SMTP exfiltration, so detecting the drop catches the theft before the data leaves the host.

Reporting behind it

Related detections9 linkedT1555.003 — drag to rearrange

Suspicious Termination of Telegram Desktop Prior to Session Theft

Suspicious BoryptGrab Infostealer Staging Directory (via file_event)

Suspicious Browser and Wallet Credential Theft via JavaScript Stealer

Windows SQLite CLI Querying Chromium Browser Profile Databases

Suspicious Chromium Browser Launch with Remote Debugging Port for Cookie Theft (via process_creation)

Malicious dllFake Stealer Execution from WindowsApps Directory (via process_creation)

Suspicious Cryptocurrency Wallet File Access by Stealer (via process_creation)

Malicious macOS Stealer Staging to Users Shared Directory (via process_creation)

Suspicious PAN-OS Running Config Staged as Web Content via CVE-2024-3400

Malicious Browser Credential Dump File Drop by Phantom Stealer via file_event

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.

Full detection rule

Unlock this rule to view and copy it

The detection logic is included with a plan. Everything else — context, mappings and implementation details — stays free on this page.

Sign in for 3 free unlocks

Signing in gives you 3 unlocks to spend on any rule in the library. No card, and they do not expire.

Also included

Unlocked rules convert on this page — to Splunk SPL or Splunk — Raw Index SPL or Microsoft Sentinel KQL or Microsoft Sentinel ASIM ASIM KQL or Microsoft Defender XDR KQL or Elastic Security KQL or Elastic Security Lucene or Elastic Security ES|QL or CrowdStrike Falcon CQL or SentinelOne PowerQuery or Palo Alto Cortex XDR XQL or Carbon Black Cloud Platform Search or Carbon Black EDR Process Search or Google Security Operations UDM Search or IBM QRadar AQL or Sumo Logic Cloud SIEM Rules expression or Rapid7 InsightIDR LEQL or Graylog Search or OpenSearch Lucene or OpenSearch PPL PPL or Grafana Loki LogQL or SQLite SQL or Zircolite SQLite — with the log-source profile the engine picked, the field map it used, and everything it could not express. Converting a rule you have unlocked costs no further credit.

See it run on a free rule →Convert your own rule →