NTLM Brute Force

 1title: NTLM Brute Force
 2id: 9c8acf1a-cbf9-4db6-b63c-74baabe03e59
 3status: test
 4description: Detects common NTLM brute force device names
 5references:
 6    - https://www.varonis.com/blog/investigate-ntlm-brute-force
 7author: Jerry Shockley '@jsh0x'
 8date: 2022/02/02
 9tags:
10    - attack.credential_access
11    - attack.t1110
12logsource:
13    product: windows
14    service: ntlm
15    definition: Requires events from Microsoft-Windows-NTLM/Operational
16detection:
17    selection:
18        EventID: 8004
19    devicename:
20        WorkstationName:
21            - 'Rdesktop'
22            - 'Remmina'
23            - 'Freerdp'
24            - 'Windows7'
25            - 'Windows8'
26            - 'Windows2012'
27            - 'Windows2016'
28            - 'Windows2019'
29    condition: selection and devicename
30falsepositives:
31    - Systems with names equal to the spoofed ones used by the brute force tools
32level: medium