Sigma rule: NtdllPipe Like Activity Execution

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-763507807a76, updated 2023-03-07T00:00:00.000Z.

Rule

Title
NtdllPipe Like Activity Execution
Status
test
Level
high
Author
Florian Roth (Nextron Systems)
Date
2022-03-05
Modified
2023-03-07
File
rules/windows/process_creation/proc_creation_win_cmd_ntdllpipe_redirect.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects command that type the content of ntdll.dll to a different file or a pipe in order to evade AV / EDR detection. As seen being used in the POC NtdllPipe

Log source

product
windows
category
process_creation

Detection

selection:
    CommandLine|contains:
        - 'type %windir%\system32\ntdll.dll'
        - 'type %systemroot%\system32\ntdll.dll'
        - 'type c:\windows\system32\ntdll.dll'
        - '\\ntdll.dll > \\\\.\\pipe\\'
condition: selection

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.defense-impairment

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_cmd_ntdllpipe_redirect.yml

Sources and licences

  • SigmaHQ

    "NtdllPipe Like Activity Execution" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_cmd_ntdllpipe_redirect.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: NtdllPipe Like Activity Execution",
entity page, dataset version ref-763507807a76, updated 2023-03-07T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/bbc865e4-7fcd-45a6-8ff1-95ced28ec5b2 (accessed 2026-11-03).
Underlying source: SigmaHQ rule bbc865e4-7fcd-45a6-8ff1-95ced28ec5b2, 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.