Malicious Scheduled Task Creation TaskSystem via Interlock Ransomware

PremiumReviewedSigma · High · v1
Product
windows
Category
process_creation
Author
HuntRule
Published
2026-09-11
Updated
2026-09-11

ATT&CK techniques

Execution → Priv Esc
  1. Recon

  2. Resource Dev

  3. Initial Access

  4. Defense Evasion

  5. Cred Access

  6. Discovery

  7. Lateral Movement

  8. Collection

  9. C2

  10. Exfiltration

  11. Impact

What it detects

This rule detects creation of a scheduled task named TaskSystem that runs in the SYSTEM context which Interlock ransomware operators use to establish persistence and execute payloads with elevated privileges. The fixed task name combined with SYSTEM execution distinguishes this from routine administrative task creation.

Related detections9 linkedT1053.005 — drag to rearrange
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Suspicious Scheduled Task Creation With WebDAV Loader Task Names (via process_creation)
Suspicious Scheduled Task Creation with ClickFix Update Recon Name (via process_creation)
Malicious Scheduled Task Named Gentlemen via Schtasks
Malicious Scheduled Task Masquerading as Defender NisSrv via Schtasks
Malicious Scheduled Task Masquerading as Windows Defender Updater (via process_creation)
Suspicious Scheduled Task Masquerading as Palo Alto Cortex Services
Malicious Scheduled Task Creation TaskSystem via Interlock Ransomware
Pivot detection · T1053.005 · 9 related

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