UAC Bypass With Fake DLL — Sigma Rule

Rule metadata and linked tags

Author: oscd.community, Dmitry Uchakin. Source status: test; severity: high. Source dates: 2020-10-06 / 2022-12-25.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 75fee62e6177e73356330c16093f4cd2b46cf75f20d0cbc8fa7b429cac91578a

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: UAC Bypass With Fake DLL
id: a5ea83a7-05a5-44c1-be2e-addccbbd8c03
status: test
description: Attempts to load dismcore.dll after dropping it
references:
    - https://steemit.com/utopian-io/@ah101/uac-bypassing-utility
author: oscd.community, Dmitry Uchakin
date: 2020-10-06
modified: 2022-12-25
tags:
    - attack.persistence
    - attack.privilege-escalation
    - attack.execution
    - attack.stealth
    - attack.t1548.002
    - attack.t1574.001
logsource:
    category: image_load
    product: windows
detection:
    selection:
        Image|endswith: '\dism.exe'
        ImageLoaded|endswith: '\dismcore.dll'
    filter:
        ImageLoaded: 'C:\Windows\System32\Dism\dismcore.dll'
    condition: selection and not filter
falsepositives:
    - Actions of a legitimate telnet client
level: high

Original YAML and metadata in JSON

False positives

• Actions of a legitimate telnet client

Source references

• https://steemit.com/utopian-io/@ah101/uac-bypassing-utility