Execution DLL of Choice Using WAB.EXE — Sigma Rule

Rule metadata and linked tags

Author: oscd.community, Natalia Shornikova. Source status: test; severity: high. Source dates: 2020-10-13 / 2023-08-17.

{
  "category": "registry_set",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 750827ac4c0d9a5a455ed49d2b5c889d72cdec7e2716830b4764bc1df0efaf3f

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Execution DLL of Choice Using WAB.EXE
id: fc014922-5def-4da9-a0fc-28c973f41bfb
status: test
description: This rule detects that the path to the DLL written in the registry is different from the default one. Launched WAB.exe tries to load the DLL from Registry.
references:
    - https://github.com/LOLBAS-Project/LOLBAS/blob/8283d8d91552213ded165fd36deb6cb9534cb443/yml/OSBinaries/Wab.yml
    - https://twitter.com/Hexacorn/status/991447379864932352
    - http://www.hexacorn.com/blog/2018/05/01/wab-exe-as-a-lolbin/
author: oscd.community, Natalia Shornikova
date: 2020-10-13
modified: 2023-08-17
tags:
    - attack.stealth
    - attack.t1218
logsource:
    category: registry_set
    product: windows
detection:
    selection:
        TargetObject|endswith: '\Software\Microsoft\WAB\DLLPath'
    filter:
        Details: '%CommonProgramFiles%\System\wab32.dll'
    condition: selection and not filter
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://github.com/LOLBAS-Project/LOLBAS/blob/8283d8d91552213ded165fd36deb6cb9534cb443/yml/OSBinaries/Wab.yml
• https://twitter.com/Hexacorn/status/991447379864932352
• http://www.hexacorn.com/blog/2018/05/01/wab-exe-as-a-lolbin/