Malicious PowerShell Download Rename and Execute Chain via Script Block

ATT&CK techniques

Execution → C2

Recon
Resource Dev
Initial Access
Execution
- T1059.001PowerShell
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
- T1105Ingress Tool Transfer
Exfiltration
Impact

What it detects

This rule detects a PowerShell script block that downloads a file into the public directory with Invoke-WebRequest, renames it to an executable with Rename-Item, and launches it with Start-Process. RomCom uses this exact chain after its Firefox and Windows zero-day exploitation to stage and run its backdoor. This indicates scripted payload delivery following exploitation.

Reporting behind it

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Malicious PowerShell Download Rename and Execute Chain via Script Block

Pivot detection · T1059.001 · 9 related

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