Suspicious Browser Kiosk Mode Forcing Credential Entry via process_creation

ATT&CK techniques

Cred Access → Collection

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
- T1056.002GUI Input Capture
- T1555.003Credentials from Web Browsers
Discovery
Lateral Movement
Collection
- T1056.002GUI Input Capture
C2
Exfiltration
Impact

What it detects

This rule detects the Credential Flusher technique that launches a Chromium based browser in fullscreen kiosk mode pointed at a login URL to coerce the victim into re-entering account credentials. The captured passwords are then harvested by an accompanying StealC infostealer delivered through Amadey. The pairing of kiosk mode with an app URL is a deliberate credential prompting behavior rather than normal browsing.

Reporting behind it

Related detections9 linkedT1555.003 — drag to rearrange

Possible Spectre Ops C2 Beacon via nico and yfat Query Parameters via proxy

Malicious Live Ledger Stealer Execution via Ledger Lives Masquerade via process_creation

Suspicious Access to Chrome Encrypted Preference MAC Registry Values (via registry_set)

Malicious SessionGopher Credential Extraction via PowerShell (via ps_script)

Suspicious Termination of Telegram Desktop Prior to Session Theft

Suspicious Download of Edge Login Data Stealer via curl

Suspicious Chrome Masquerade Running from ProgramData Google Path (via process_creation)

Suspicious Browser Remote Debugging Port Cookie Theft via process_creation

Malicious Credential Stealer PowerShell Script Names Targeting Financial Services

Suspicious Browser Kiosk Mode Forcing Credential Entry 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.

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 →