{"id":"e9d4ab66-a532-4ef7-a502-66a9e4a34f5d","title":"NTLMv1 Logon Between Client and Server","description":"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.","author":"Tim Shelton, Nasreddine Bencherchali (Nextron Systems)","status":"test","level":"medium","date":"2022-04-26","modified":"2023-06-06","tags":["attack.lateral-movement","attack.t1550.002"],"technique_ids":["T1550.002"],"logsource":{"product":"windows","service":"system"},"falsepositives":["Environments that use NTLMv1"],"references":["https://github.com/nasbench/EVTX-ETW-Resources/blob/f1b010ce0ee1b71e3024180de1a3e67f99701fe4/ETWProvidersManifests/Windows10/22H2/W10_22H2_Pro_20230321_19045.2728/WEPExplorer/LsaSrv.xml"],"source_path":"rules/windows/builtin/system/lsasrv/win_system_lsasrv_ntlmv1.yml","source_sha256":"5afaf70983ef0d4db770d98661be56a13c8a4e7c7d12ff96f98858de5ebda90f","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/builtin/system/lsasrv/win_system_lsasrv_ntlmv1.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: NTLMv1 Logon Between Client and Server\nid: e9d4ab66-a532-4ef7-a502-66a9e4a34f5d\nstatus: test\ndescription: 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.\nreferences:\n    - https://github.com/nasbench/EVTX-ETW-Resources/blob/f1b010ce0ee1b71e3024180de1a3e67f99701fe4/ETWProvidersManifests/Windows10/22H2/W10_22H2_Pro_20230321_19045.2728/WEPExplorer/LsaSrv.xml\nauthor: Tim Shelton, Nasreddine Bencherchali (Nextron Systems)\ndate: 2022-04-26\nmodified: 2023-06-06\ntags:\n    - attack.lateral-movement\n    - attack.t1550.002\nlogsource:\n    product: windows\n    service: system\ndetection:\n    selection:\n        Provider_Name: \"LsaSrv\"\n        EventID:\n            - 6038\n            - 6039\n    condition: selection\nfalsepositives:\n    - Environments that use NTLMv1\nlevel: medium\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1550.002","id":"T1550.002","name":"Pass the Hash","page":"techniques/enterprise/T1550.002/"}],"data_path":"data/detection-rules/e9d4ab66-a532-4ef7-a502-66a9e4a34f5d.json","kind":"sigma"}