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PUA - Crassus Execution

Detects Crassus, a Windows privilege escalation discovery tool, based on PE metadata characteristics.

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Martin MuellerCreated Mon Apr 172c32b543-1058-4808-91c6-5b31b8bed6c5windows
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: '\Crassus.exe'
        - OriginalFileName: 'Crassus.exe'
        - Description|contains: 'Crassus'
    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
2c32b543-1058-4808-91c6-5b31b8bed6c5
Status
test
Level
high
Type
Detection
Created
Mon Apr 17
Author
Martin Mueller
Path
rules/windows/process_creation/proc_creation_win_pua_crassus.yml
Raw Tags
attack.discoveryattack.reconnaissanceattack.t1590.001
View on GitHub