Malicious Registry Hive Dump via reg save

ATT&CK techniques

Cred Access

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

What it detects

This rule detects reg.exe saving the SYSTEM, SAM, or SECURITY registry hives to disk, a credential-access technique used by Winnti in Operation CuckooBees to extract cached secrets and password hashes. Attackers export these hives for offline extraction of account credentials. Saving these particular hives is rarely legitimate outside backup tooling and strongly indicates credential theft.

Reporting behind it

Related detections9 linkedT1003.002 — drag to rearrange

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

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)

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

Suspicious SAM Registry Hive Dump to Windows Temp by BianLian

Malicious SAM and SYSTEM Hive Dump via reg save (via process_creation)

Malicious Mimikatz Credential Access Module Invocation

Malicious SYSTEM Registry Hive Dump via reg.exe by Sandworm

Malicious Registry Hive Dump via reg save

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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