File Download Via Windows Defender MpCmpRun.EXE — Sigma Rule

Rule metadata and linked tags

Author: Matthew Matchen. Source status: test; severity: high. Source dates: 2020-09-04 / 2023-11-09.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 0678de9bf9094fbaa679603e9bd0f58be55a8caed768c7d72fff29ba7b34e083

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: File Download Via Windows Defender MpCmpRun.EXE
id: 46123129-1024-423e-9fae-43af4a0fa9a5
status: test
description: Detects the use of Windows Defender MpCmdRun.EXE to download files
references:
    - https://web.archive.org/web/20200903194959/https://twitter.com/djmtshepana/status/1301608169496612866
    - https://lolbas-project.github.io/lolbas/Binaries/MpCmdRun/
author: Matthew Matchen
date: 2020-09-04
modified: 2023-11-09
tags:
    - attack.stealth
    - attack.t1218
    - attack.command-and-control
    - attack.t1105
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - OriginalFileName: 'MpCmdRun.exe'
        - Image|endswith: '\MpCmdRun.exe'
        - CommandLine|contains: 'MpCmdRun.exe'
        - Description: 'Microsoft Malware Protection Command Line Utility'
    selection_cli:
        CommandLine|contains|all:
            - 'DownloadFile'
            - 'url'
    condition: all of selection_*
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://web.archive.org/web/20200903194959/https://twitter.com/djmtshepana/status/1301608169496612866
• https://lolbas-project.github.io/lolbas/Binaries/MpCmdRun/