huntrule

Linux Process Creation: Shai-Hulud String Indicators in Command Line

Alerts on Linux process command lines containing Shai-Hulud or SHA1HULUD indicator strings.

FreeReviewedSigma · High · v5
Product
linux
Category
process_creation
Author
Swachchhanda Shrawan Poudel (Nextron Systems) (SigmaHQ), DRL 1.1
Published
2025-11-25
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 flags Linux process creation events where the process command line contains the strings "Shai-Hulud" or "SHA1HULUD". Attackers may embed recognizable naming or markers in malware components or launch arguments to support development, targeting, or operational behavior. Detection relies on process creation telemetry that includes the full command line for each spawned process.

Reporting behind it

Related detections9 linkedT1059 — drag to rearrange
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Malicious IIS Worker Process Spawning Command Shell after ASP.NET ViewState Injection (via process_creation)
Suspicious MSSQL xp_cmdshell Enablement via sp_configure (via process_creation)
Linux Process Creation: Shai-Hulud String Indicators in Command Line
Pivot detection · T1059 · 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.