Suspicious Windows Update Agent Empty Cmdline

 1title: Suspicious Windows Update Agent Empty Cmdline
 2id: 52d097e2-063e-4c9c-8fbb-855c8948d135
 3status: test
 4description: |
 5        Detects suspicious Windows Update Agent activity in which a wuauclt.exe process command line doesn't contain any command line flags
 6references:
 7    - https://redcanary.com/blog/blackbyte-ransomware/
 8author: Florian Roth (Nextron Systems)
 9date: 2022/02/26
10modified: 2023/11/11
11tags:
12    - attack.defense_evasion
13    - attack.t1036
14logsource:
15    category: process_creation
16    product: windows
17detection:
18    selection_img:
19        - Image|endswith: '\Wuauclt.exe'
20        - OriginalFileName: 'Wuauclt.exe'
21    selection_cli:
22        CommandLine|endswith:
23            - 'Wuauclt'
24            - 'Wuauclt.exe'
25    condition: all of selection*
26falsepositives:
27    - Unknown
28level: high

References

• ProxyShell exploitation leads to BlackByte ransomware - Red Canary

  

  BlackByte ransomware leverages ProxyShell Microsoft Exchange vulnerabilities for initial access and Cobalt Strike for lateral movement.

  
  Read More

Related rules

• Suspicious Calculator Usage
• System File Execution Location Anomaly
• Explorer Process Tree Break
• HackTool - XORDump Execution
• Process Memory Dump Via Comsvcs.DLL