Suspicious Rename of Double-Extension PowerShell Script (via process_creation)

ATT&CK techniques

Execution → Defense Evasion

Recon
Resource Dev
Initial Access
Execution
- T1059.001PowerShell
Persistence
Priv Esc
Defense Evasion
- T1036Masquerading
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects a command shell renaming a file with a ps12x extension to a ps1 script. The DEEP#GOSU campaign linked to Kimsuky staged its PowerShell payload with this uncommon double extension before renaming and executing it.

Reporting behind it

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Suspicious Rename of Double-Extension PowerShell Script (via process_creation)

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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