Sigma rule: ShimCache Flush

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-28875617536f, updated 2021-02-01T00:00:00.000Z.

Rule

Title
ShimCache Flush
Status
stable
Level
high
Author
Florian Roth (Nextron Systems)
Date
2021-02-01
File
rules/windows/process_creation/proc_creation_win_rundll32_susp_shimcache_flush.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects actions that clear the local ShimCache and remove forensic evidence

Log source

product
windows
category
process_creation

Detection

selection1a:
    CommandLine|contains|all:
        - 'rundll32'
        - 'apphelp.dll'
selection1b:
    CommandLine|contains:
        - 'ShimFlushCache'
        - '#250'
selection2a:
    CommandLine|contains|all:
        - 'rundll32'
        - 'kernel32.dll'
selection2b:
    CommandLine|contains:
        - 'BaseFlushAppcompatCache'
        - '#46'
condition: ( selection1a and selection1b ) or ( selection2a and selection2b )

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.persistence
  • attack.defense-impairment
  • attack.t1112

MITRE ATT&CK ids this rule names

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_rundll32_susp_shimcache_flush.yml

Sources and licences

  • SigmaHQ

    "ShimCache Flush" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_rundll32_susp_shimcache_flush.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: ShimCache Flush",
entity page, dataset version ref-28875617536f, updated 2021-02-01T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/b0524451-19af-4efa-a46f-562a977f792e (accessed 2026-11-03).
Underlying source: SigmaHQ rule b0524451-19af-4efa-a46f-562a977f792e, 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.