Suspicious RunMRU Entry Containing Script Download from ClickFix

ATT&CK techniques

Execution

Recon
Resource Dev
Initial Access
Execution
- T1059.001PowerShell
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects a RunMRU history value that records a scripted download command such as PowerShell or mshta invoking a remote resource. ClickFix social engineering has the victim paste the command into the Run dialog which leaves the payload in RunMRU before it is cleared. Script interpreters and download utilities in the Run dialog history strongly suggest a ClickFix style delivery.

Reporting behind it

Related detections9 linkedT1059.001 — drag to rearrange

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CastleLoader ClickFix PowerShell Hex Decode and Re-Execution

Malicious Non-Interactive Encoded PowerShell Stager (via process_creation)

Malicious ActiveMQ Exploitation Java Spawning PowerShell Downloader (via process_creation)

Suspicious Cleo Autorun Health Check File Drop (via file_event)

Suspicious PowerShell Spawned by VBScript for RMM Delivery

Suspicious PowerShell Loading Fake Edge Update Script

Suspicious RunMRU Entry Containing Script Download from ClickFix

Pivot detection · T1059.001 · 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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