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

ATT&CK techniques

Cred Access → Collection

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
- T1003.002Security Account Manager
Discovery
Lateral Movement
Collection
- T1560.001Archive via Utility
C2
Exfiltration
Impact

What it detects

This rule detects use of WinRAR to compress the SAM and SYSTEM registry hives for exfiltration. UAT-8099 archives these hives to extract credentials offline from compromised IIS servers. Archiving registry hives is a collection step supporting credential access and later exfiltration.

Reporting behind it

Related detections9 linkedT1003.002 — drag to rearrange

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

Malicious Registry Hive Dump of SAM or SYSTEM via Reg Save (via process_creation)

Malicious Credential Hive Copy from Volume Shadow Copy

Malicious Secretdump Password Dumping via SMB Admin Share (via security)

Suspicious Archive Staged in Web Accessible Directory via tar

Malicious Registry Hive Dump of SAM and SYSTEM via Reg Save (via process_creation)

Suspicious Archive Staged in Web Root via tar on Ivanti EPMM

Suspicious SAM Registry Hive Dump to Windows Temp by BianLian

Suspicious Payload Staging in Public Libraries Directory via file_event

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

Pivot detection · T1003.002 · 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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