Suspicious PowerShell Stager Download of Spf Script by Seedworm

PremiumReviewedSigma · Medium · v1
Category
ps_script
Author
HuntRule
Published
2026-05-16
Updated
2026-08-28

ATT&CK techniques

Execution → C2
  1. Recon

  2. Resource Dev

  3. Initial Access

  4. Persistence

  5. Priv Esc

  6. Defense Evasion

  7. Cred Access

  8. Discovery

  9. Lateral Movement

  10. Collection

  11. Exfiltration

  12. Impact

What it detects

This rule detects PowerShell referencing the Spf.ps1 stager under a remote install path used by the Seedworm MuddyWater actor. The script initiates the next stage of the intrusion against Middle East targets. PowerShell fetching a remote install script is a common first-stage execution technique.

Related detections9 linkedT1059.001 — drag to rearrange
Suspicious PowerShell Invoke-WebRequest Piped to Invoke-Expression via FakeBat Loader
Suspicious PowerShell COM-Based Script Execution and HTTP Retrieval (via ps_script)
Malicious Powerfun Reverse Shell Script via Script Block (via ps_script)
Windows curl.exe SOCKS Proxy and .onion Command-Line Execution
Suspicious Scheduled Task Running PowerShell Every Minute (via process_creation)
Malicious Script Host Spawning PowerShell With Invoke-Expression (via process_creation)
Possible Remcos C2 Connection from eilowutil Process
Hidden PowerShell Archive Extraction via ExtractToDirectory
CastleLoader ClickFix PowerShell Hex Decode and Re-Execution
Suspicious PowerShell Stager Download of Spf Script by Seedworm
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.