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Windows JScript Compiler (jsc.exe) Process Execution

Identifies execution of jsc.exe (JScript Compiler) from Windows process creation logs.

FreeReviewedSigma · Low · v2
Product
windows
Category
process_creation
Author
frack113 (SigmaHQ), DRL 1.1
Published
2022-05-02
Updated
2026-07-31
AnalysisDetection

ATT&CK techniques

Execution → Defense Evasion

  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

Identifies when the Windows JScript Compiler executable (jsc.exe) is launched. Attackers can use jsc.exe to compile JScript content dynamically, potentially helping evade application allowlisting controls. The detection relies on Windows process creation telemetry, matching the launched binary name/path ending in \jsc.exe and the process OriginalFileName value of jsc.exe.

Reporting behind it

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Windows: Process creation involving VSIISExeLauncher.exe with -p and -a arguments
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Windows JScript Compiler (jsc.exe) Process Execution
Pivot detection · T1127 · 9 related

Changelog

v2
  1. v2
    Candidate ingested via manual entry.2026-07-31
  2. 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.