Sigma rule: WinSxS Executable File Creation By Non-System Process

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-30c4612c3f3d, updated 2023-05-11T00:00:00.000Z.

Rule

Title
WinSxS Executable File Creation By Non-System Process
Status
test
Level
medium
Author
Nasreddine Bencherchali (Nextron Systems)
Date
2023-05-11
File
rules/windows/file/file_event/file_event_win_susp_winsxs_binary_creation.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects the creation of binaries in the WinSxS folder by non-system processes

Log source

product
windows
category
file_event

Detection

selection:
    TargetFilename|startswith: 'C:\Windows\WinSxS\'
    TargetFilename|endswith: '.exe'
filter_main_system_location:
    Image|startswith:
        - 'C:\Windows\Systems32\'
        - 'C:\Windows\SysWOW64\'
        - 'C:\Windows\WinSxS\'
condition: selection and not 1 of filter_main_*

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.execution

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/file/file_event/file_event_win_susp_winsxs_binary_creation.yml

Sources and licences

  • SigmaHQ

    "WinSxS Executable File Creation By Non-System Process" by Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/file/file_event/file_event_win_susp_winsxs_binary_creation.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: WinSxS Executable File Creation By Non-System Process",
entity page, dataset version ref-30c4612c3f3d, updated 2023-05-11T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/34746e8c-5fb8-415a-b135-0abc167e912a (accessed 2026-11-03).
Underlying source: SigmaHQ rule 34746e8c-5fb8-415a-b135-0abc167e912a, 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.