NetNTLM Downgrade Attack

 1title: NetNTLM Downgrade Attack
 2id: d3abac66-f11c-4ed0-8acb-50cc29c97eed
 3related:
 4    - id: d67572a0-e2ec-45d6-b8db-c100d14b8ef2
 5      type: derived
 6status: test
 7description: Detects NetNTLM downgrade attack
 8references:
 9    - https://www.optiv.com/blog/post-exploitation-using-netntlm-downgrade-attacks
10author: Florian Roth (Nextron Systems), wagga
11date: 2018-03-20
12modified: 2022-10-09
13tags:
14    - attack.persistence
15    - attack.defense-evasion
16    - attack.t1562.001
17    - attack.t1112
18# Windows Security Eventlog: Process Creation with Full Command Line
19logsource:
20    product: windows
21    service: security
22    definition: 'Requirements: Audit Policy : Object Access > Audit Registry (Success)'
23detection:
24    selection:
25        EventID: 4657
26        ObjectName|contains|all:
27            - '\REGISTRY\MACHINE\SYSTEM'
28            - 'ControlSet'
29            - '\Control\Lsa'
30        ObjectValueName:
31            - 'LmCompatibilityLevel'
32            - 'NtlmMinClientSec'
33            - 'RestrictSendingNTLMTraffic'
34    condition: selection
35falsepositives:
36    - Unknown
37level: high