LSASS Process Memory Dump Creation Via Taskmgr.EXE — Sigma Rule

Rule metadata and linked tags

Author: Swachchhanda Shrawan Poudel. Source status: test; severity: high. Source dates: 2023-10-19 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 73247aaa9640ddc30f382da2a0718643f2f82403509db385c111205b611fb814

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: LSASS Process Memory Dump Creation Via Taskmgr.EXE
id: 69ca12af-119d-44ed-b50f-a47af0ebc364
status: test
description: Detects the creation of an "lsass.dmp" file by the taskmgr process. This indicates a manual dumping of the LSASS.exe process memory using Windows Task Manager.
author: Swachchhanda Shrawan Poudel
date: 2023-10-19
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/987e3ca988ae3cff4b9f6e388c139c05bf44bbb8/atomics/T1003.001/T1003.001.md#L1
tags:
    - attack.credential-access
    - attack.t1003.001
logsource:
    category: file_event
    product: windows
detection:
    selection:
        Image|endswith:
            - ':\Windows\system32\taskmgr.exe'
            - ':\Windows\SysWOW64\taskmgr.exe'
        TargetFilename|contains|all:
            - '\AppData\Local\Temp\'
            - '\lsass'
            - '.DMP'
    condition: selection
falsepositives:
    - Rare case of troubleshooting by an administrator or support that has to be investigated regardless
level: high
regression_tests_path: regression_data/rules/windows/file/file_event/file_event_win_taskmgr_lsass_dump/info.yml

Original YAML and metadata in JSON

False positives

• Rare case of troubleshooting by an administrator or support that has to be investigated regardless

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/987e3ca988ae3cff4b9f6e388c139c05bf44bbb8/atomics/T1003.001/T1003.001.md#L1