Potential CVE-2021-40444 Exploitation Attempt

Detects potential exploitation of CVE-2021-40444 via suspicious process patterns seen in in-the-wild exploitations

Detection logic

selection

Image|endswith: \control.exe
ParentImage|endswith:
  - \winword.exe
  - \powerpnt.exe
  - \excel.exe

filter

CommandLine|endswith:
  - \control.exe input.dll
  - \control.exe" input.dll

Condition

selection and not filter

Raw YAML

title: Potential CVE-2021-40444 Exploitation Attempt
id: 894397c6-da03-425c-a589-3d09e7d1f750
status: test
description: Detects potential exploitation of CVE-2021-40444 via suspicious process patterns seen in in-the-wild exploitations
references:
    - https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-40444
    - https://twitter.com/neonprimetime/status/1435584010202255375
    - https://www.joesandbox.com/analysis/476188/1/iochtml
author: Florian Roth (Nextron Systems), @neonprimetime
date: 2021-09-08
modified: 2023-02-04
tags:
    - attack.execution
    - attack.t1059
    - cve.2021-40444
    - detection.emerging-threats
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith: '\control.exe'
        ParentImage|endswith:
            - '\winword.exe'
            - '\powerpnt.exe'
            - '\excel.exe'
    filter:
        CommandLine|endswith:
            - '\control.exe input.dll'
            - '\control.exe" input.dll'
    condition: selection and not filter
falsepositives:
    - Unknown
level: high

False positives

Unknown

References

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