Suspicious FatalRAT Keylog File Creation in Windows Directory (via file_event)

ATT&CK techniques

Cred Access → Collection

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
- T1056.001Keylogging
Discovery
Lateral Movement
Collection
- T1056.001Keylogging
C2
Exfiltration
Impact

What it detects

This rule detects creation of the FatalRAT keylog artifact Fatal.key in the Windows directory. This behavior was observed in Operation SalmonSlalom where the backdoor recorded captured keystrokes to a fixed file for later collection. Detecting this artifact reveals credential and input capture activity on the host.

Reporting behind it

Related detections9 linkedT1056.001 — drag to rearrange

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Malicious VenomRAT Offline Keylog File Creation via file_event

Suspicious BunnyLoader Keylog Capture File in AppData Temp (via file_event)

NjRAT Fileless Keylogger Storage via Registry Value (via registry_set)

Suspicious FatalRAT Keylog File Creation in Windows Directory (via file_event)

Pivot detection · T1056.001 · 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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