NTLMv1 Logon Between Client and Server

calendar Oct 28, 2023 · attack.defense_evasion attack.lateral_movement attack.t1550.002  ·
Share on: linkedin copy

Detects the reporting of NTLMv1 being used between a client and server. NTLMv1 is insecure as the underlying encryption algorithms can be brute-forced by modern hardware.

Sigma rule (View on GitHub)

 1title: NTLMv1 Logon Between Client and Server
 2id: e9d4ab66-a532-4ef7-a502-66a9e4a34f5d
 3status: experimental
 4description: Detects the reporting of NTLMv1 being used between a client and server. NTLMv1 is insecure as the underlying encryption algorithms can be brute-forced by modern hardware.
 5references:
 6    - https://github.com/nasbench/EVTX-ETW-Resources/blob/f1b010ce0ee1b71e3024180de1a3e67f99701fe4/ETWProvidersManifests/Windows10/22H2/W10_22H2_Pro_20230321_19045.2728/WEPExplorer/LsaSrv.xml
 7author: Tim Shelton, Nasreddine Bencherchali (Nextron Systems)
 8date: 2022/04/26
 9modified: 2023/06/06
10tags:
11    - attack.defense_evasion
12    - attack.lateral_movement
13    - attack.t1550.002
14logsource:
15    product: windows
16    service: system
17detection:
18    selection:
19        Provider_Name: "LsaSrv"
20        EventID:
21            - 6038
22            - 6039
23    condition: selection
24falsepositives:
25    - Environments that use NTLMv1
26level: medium

References

Related rules

to-top