Suspicious Multi-Volume RAR Archiving for Collection by EAGERBEE

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 rar.exe creating a split multi-volume archive with a 100MB volume size, a staging step the EAGERBEE backdoor uses to package collected data before exfiltration. Volume-split archiving keeps large data sets in transfer-friendly chunks. This archiving pattern indicates data collection prior to exfiltration.

Reporting behind it

Related detections9 linkedT1560.001 — drag to rearrange

Suspicious Archive Staging to ProgramData NetWorks Path via RAR (via process_creation)

Suspicious Selective Archiving via 7-Zip Linked to INC Ransomware Exfiltration

Suspicious Data Staging via Everything and 7-Zip Prior to Exfiltration via process_creation

Suspicious Data Staging into Archive via WinRAR

Suspicious Collection Staging via Archive Utility Filters

Suspicious Restic Backup Exfiltration to Remote Repository via Command Line

Data Collection via Rar Archiving With Recursion and Compression Flags

Suspicious Archiving of Registry Hives via WinRAR (UAT-8099)

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

Suspicious Multi-Volume RAR Archiving for Collection by EAGERBEE

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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