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Detectionhightest

PUA - DefenderCheck Execution

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.

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Launch
Florian Roth (Nextron Systems)Created Tue Aug 30Updated Sat Feb 04f0ca6c24-3225-47d5-b1f5-352bf07ecfa7windows
Log Source
WindowsProcess Creation
ProductWindows← raw: windows
CategoryProcess Creation← raw: process_creation

Events generated when a new process is spawned on the system. Covers command-line arguments, parent/child relationships, and process metadata.

Detection Logic
Detection Logic1 selector
detection:
    selection:
        - Image|endswith: '\DefenderCheck.exe'
        - Description: 'DefenderCheck'
    condition: selection
False Positives
Unlikely

False positives are unlikely for most environments. High confidence detection.

References
1
Resolving title…
github.com
MITRE ATT&CK
Rule Metadata
Rule ID
f0ca6c24-3225-47d5-b1f5-352bf07ecfa7
Status
test
Level
high
Type
Detection
Created
Tue Aug 30
Modified
Sat Feb 04
Author
Florian Roth (Nextron Systems)
Path
rules/windows/process_creation/proc_creation_win_pua_defendercheck.yml
Raw Tags
attack.defense-evasionattack.t1027.005
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