Unsigned Image Loaded Into LSASS Process — Sigma Rule

Rule metadata and linked tags

Author: Teymur Kheirkhabarov, oscd.community. Source status: test; severity: medium. Source dates: 2019-10-22 / 2021-11-27.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 4275379660e0c5a751f7069ed5ae7fdbdef861da507a6b0646fbcc074b0d3cdb

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: Unsigned Image Loaded Into LSASS Process
id: 857c8db3-c89b-42fb-882b-f681c7cf4da2
status: test
description: Loading unsigned image (DLL, EXE) into LSASS process
references:
    - https://www.slideshare.net/heirhabarov/hunting-for-credentials-dumping-in-windows-environment
author: Teymur Kheirkhabarov, oscd.community
date: 2019-10-22
modified: 2021-11-27
tags:
    - attack.credential-access
    - attack.t1003.001
logsource:
    category: image_load
    product: windows
detection:
    selection:
        Image|endswith: '\lsass.exe'
        Signed: 'false'
    condition: selection
falsepositives:
    - Valid user connecting using RDP
level: medium

Original YAML and metadata in JSON

False positives

• Valid user connecting using RDP

Source references

• https://www.slideshare.net/heirhabarov/hunting-for-credentials-dumping-in-windows-environment