Suspicious RunOnce Persistence Relaunching Payload with Safe Mode Flag

ATT&CK techniques

Persistence → Priv Esc

Recon
Resource Dev
Initial Access
Execution
Persistence
- T1547.001Registry Run Keys / Startup Folder
Priv Esc
- T1547.001Registry Run Keys / Startup Folder
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects a RunOnce registry value configured to relaunch a binary with a safe mode argument which BlackMatter ransomware sets to resume encryption after rebooting the host into Safe Mode. Running in Safe Mode disables security tooling while the RunOnce entry guarantees the payload restarts. It is important because this combination signals an in-progress ransomware detonation.

Reporting behind it

Related detections9 linkedT1547.001 — drag to rearrange

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Suspicious Ousaban Installation Marker maisum.dat Created (via file_event)

Suspicious Shahmaran Autostart Masquerading as Adobe Updater

Suspicious K7Soft Autostart Persistence

Suspicious Run Key Persistence to svcghost in Public WPSManager Path via Registry

Suspicious RunOnce Persistence Relaunching Payload with Safe Mode Flag

Pivot detection · T1547.001 · 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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