Suspicious MSDT Parent Process

SIGMA detection rule by Nextron Systems · NOASSERTION

Detects msdt.exe executed by a suspicious parent as seen in CVE-2022-30190 / Follina exploitation

title: Suspicious MSDT Parent Process
id: 7a74da6b-ea76-47db-92cc-874ad90df734
status: test
description: Detects msdt.exe executed by a suspicious parent as seen in CVE-2022-30190 / Follina exploitation
references:
    - https://twitter.com/nao_sec/status/1530196847679401984
    - https://app.any.run/tasks/713f05d2-fe78-4b9d-a744-f7c133e3fafb/
author: Nextron Systems
date: 2022-06-01
modified: 2023-02-06
tags:
    - attack.stealth
    - attack.t1036
    - attack.t1218
logsource:
    category: process_creation
    product: windows
detection:
    selection_parent:
        ParentImage|endswith:
            - '\cmd.exe'
            - '\cscript.exe'
            - '\mshta.exe'
            - '\powershell.exe'
            - '\pwsh.exe'
            - '\regsvr32.exe'
            - '\rundll32.exe'
            - '\schtasks.exe'
            - '\wmic.exe'
            - '\wscript.exe'
            - '\wsl.exe'
            # Note: office applications are covered by: 438025f9-5856-4663-83f7-52f878a70a50
    selection_msdt:
        - Image|endswith: '\msdt.exe'
        - OriginalFileName: 'msdt.exe'
    condition: all of selection_*
falsepositives:
    - Unknown
level: high

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

19fcc8ee-f417-492a-9ef0-89280b75541a

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

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