Suspicious WinRAR Silent Archive Staging

ATT&CK techniques

Collection

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
- T1560.001Archive via Utility
C2
Exfiltration
Impact

What it detects

This rule detects WinRAR invoked with the specific silent recursion and monitoring flag combination used to stage data for exfiltration. This behavior matches Akira operators who archive victim files quietly prior to theft. This distinctive flag set is uncommon in normal usage and indicates automated collection of files before ransomware exfiltration.

Reporting behind it

Related detections9 linkedT1560.001 — drag to rearrange

Suspicious Data Staging via Password-Protected Archive Utility (via process_creation)

Suspicious Archive Staged in Web Accessible Directory via tar

Suspicious Archive Staged in Web Root via tar on Ivanti EPMM

Suspicious Payload Staging in Public Libraries Directory via file_event

Suspicious macOS Data Staging via ditto to Temp Archive in Attacker Directory (via process_creation)

Suspicious VOLTZITE Single-Character Named ZIP Exfil Staging (via file_event)

Linux Process Creation Indicators for LiteLLM Backdoored Package Activity (v1.82.7/v1.82.8)

macOS Process Creation: hdiutil Used to Attach or Mount Disk Images

Windows tar.exe Used to Create Compressed Archives

Suspicious WinRAR Silent Archive Staging

Pivot detection · T1560.001 · 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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