PUA - DefenderCheck Execution

calendar Aug 12, 2024 · attack.defense-evasion attack.t1027.005  ·
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Detects the use of DefenderCheck, a tool to evaluate the signatures used in Microsoft Defender. It can be used to figure out the strings / byte chains used in Microsoft Defender to detect a tool and thus used for AV evasion.

Sigma rule (View on GitHub)

 1title: PUA - DefenderCheck Execution
 2id: f0ca6c24-3225-47d5-b1f5-352bf07ecfa7
 3status: test
 4description: Detects the use of DefenderCheck, a tool to evaluate the signatures used in Microsoft Defender. It can be used to figure out the strings / byte chains used in Microsoft Defender to detect a tool and thus used for AV evasion.
 5references:
 6    - https://github.com/matterpreter/DefenderCheck
 7author: Florian Roth (Nextron Systems)
 8date: 2022-08-30
 9modified: 2023-02-04
10tags:
11    - attack.defense-evasion
12    - attack.t1027.005
13logsource:
14    category: process_creation
15    product: windows
16detection:
17    selection:
18        - Image|endswith: '\DefenderCheck.exe'
19        - Description: 'DefenderCheck'
20    condition: selection
21falsepositives:
22    - Unlikely
23level: high

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