NTLMv1 Logon Between Client and Server
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.
Detection logic
selection
Provider_Name: LsaSrv
EventID:
- 6038
- 6039Condition
selectionRaw YAML
title: NTLMv1 Logon Between Client and Server
id: e9d4ab66-a532-4ef7-a502-66a9e4a34f5d
status: test
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.
references:
- https://github.com/nasbench/EVTX-ETW-Resources/blob/f1b010ce0ee1b71e3024180de1a3e67f99701fe4/ETWProvidersManifests/Windows10/22H2/W10_22H2_Pro_20230321_19045.2728/WEPExplorer/LsaSrv.xml
author: Tim Shelton, Nasreddine Bencherchali (Nextron Systems)
date: 2022-04-26
modified: 2023-06-06
tags:
- attack.lateral-movement
- attack.t1550.002
logsource:
product: windows
service: system
detection:
selection:
Provider_Name: "LsaSrv"
EventID:
- 6038
- 6039
condition: selection
falsepositives:
- Environments that use NTLMv1
level: mediumFalse positives
- Environments that use NTLMv1