Sigma rule: Suspicious Parent Double Extension File Execution

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-a472ca3abdb2, updated 2023-02-28T00:00:00.000Z.

Rule

Title
Suspicious Parent Double Extension File Execution
Status
test
Level
high
Author
frack113, Nasreddine Bencherchali (Nextron Systems)
Date
2023-01-06
Modified
2023-02-28
File
rules/windows/process_creation/proc_creation_win_susp_double_extension_parent.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detect execution of suspicious double extension files in ParentCommandLine

Log source

product
windows
category
process_creation

Detection

selection:
    - ParentImage|endswith:
          - '.doc.lnk'
          - '.docx.lnk'
          - '.xls.lnk'
          - '.xlsx.lnk'
          - '.ppt.lnk'
          - '.pptx.lnk'
          - '.rtf.lnk'
          - '.pdf.lnk'
          - '.txt.lnk'
          - '.doc.js'
          - '.docx.js'
          - '.xls.js'
          - '.xlsx.js'
          - '.ppt.js'
          - '.pptx.js'
          - '.rtf.js'
          - '.pdf.js'
          - '.txt.js'
    - ParentCommandLine|contains:
          - '.doc.lnk'
          - '.docx.lnk'
          - '.xls.lnk'
          - '.xlsx.lnk'
          - '.ppt.lnk'
          - '.pptx.lnk'
          - '.rtf.lnk'
          - '.pdf.lnk'
          - '.txt.lnk'
          - '.doc.js'
          - '.docx.js'
          - '.xls.js'
          - '.xlsx.js'
          - '.ppt.js'
          - '.pptx.js'
          - '.rtf.js'
          - '.pdf.js'
          - '.txt.js'
condition: selection

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.stealth
  • attack.t1036.007

MITRE ATT&CK ids this rule names

Related rules

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_susp_double_extension_parent.yml

Sources and licences

  • SigmaHQ

    "Suspicious Parent Double Extension File Execution" by frack113, Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_susp_double_extension_parent.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Suspicious Parent Double Extension File Execution",
entity page, dataset version ref-a472ca3abdb2, updated 2023-02-28T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/5e6a80c8-2d45-4633-9ef4-fa2671a39c5c (accessed 2026-11-03).
Underlying source: SigmaHQ rule 5e6a80c8-2d45-4633-9ef4-fa2671a39c5c, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.