Suspicious Keylog and Screenshot Files in windows-cache Directory (OtterCookie)

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
- T1113Screen Capture
C2
Exfiltration
Impact

What it detects

This rule detects creation of the collection artifacts 1.tmp and 2.jpeg inside a windows-cache directory, where the OtterCookie module stores keystroke logs and screenshots before exfiltration. These fixed staging paths and filenames are distinctive to the malware. Their appearance indicates active input capture and screen collection.

Reporting behind it

Related detections9 linkedT1056.001 — drag to rearrange

Suspicious WezRat Keylog File in Temp Directory

Suspicious Larva-24009 Keylogger Log Staging in OneDrive Path (via file_event)

Suspicious RDP Shadow Session Started - Native (via rdp)

Suspicious Kimsuky AlphaSeed Artifacts in edge Hidden Directory (via file_event)

Malicious RDP Shadow Session Configuration Enabled - Registry (via registry_event)

Suspicious GoGRPC Screen Capture Log File Creation (via file_event)

In-Memory Remcos RAT Keylog Store Created Under ProgramData rema (via file_event)

Possible Andariel Keylogger Output Archive Staged in Temp (via file_event)

Suspicious Parallax RAT Keylogger Output File Creation via File System (via file_event)

Suspicious Keylog and Screenshot Files in windows-cache Directory (OtterCookie)

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.

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 →