huntrule

Windows: Raspberry Robin Command Execution via fodhelper.exe and rundll32/regsvr32

Flags Windows process-spawn chains where fodhelper.exe runs rundll32/regsvr32 with Raspberry Robin-style command-line patterns.

FreeReviewedSigma · High · v5
Product
windows
Category
process_creation
Author
@kostastsale (SigmaHQ), DRL 1.1
Published
2022-05-06
Updated
2026-07-31
AnalysisDetection

ATT&CK techniques

Execution

  1. Recon

  2. Resource Dev

  3. Initial Access

  4. Execution

  5. Persistence

  6. Priv Esc

  7. Defense Evasion

  8. Cred Access

  9. Discovery

  10. Lateral Movement

  11. Collection

  12. C2

  13. Exfiltration

  14. Impact

What it detects

This rule identifies suspicious Windows process creation where a parent process ending in \fodhelper.exe launches child processes ending in \rundll32.exe or \regsvr32.exe with command lines containing specific Raspberry Robin-related sequences. The behavior matters because these execution chains are used to run attacker-controlled code through trusted Windows binaries. It relies on process creation telemetry, specifically ParentImage, Image, and full CommandLine content.

Reporting behind it

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Suspicious SharePoint Worker Process Spawning Command Interpreter via ToolShell
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Windows: Raspberry Robin Command Execution via fodhelper.exe and rundll32/regsvr32
Pivot detection · T1059.001 · 9 related

Changelog

v5
  1. v5
    Candidate ingested via manual entry.2026-07-31
  2. v4
    Candidate ingested via manual entry.2026-07-31
  3. v3
    Candidate ingested via manual entry.2026-07-31
  4. v2
    Candidate ingested via manual entry.2026-07-31
  5. v1
    No changelog recorded for this version.2026-07-30

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.