Detection rules › Sigma
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.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Lateral Movement | T1550.002 Use Alternate Authentication Material: Pass the Hash |
Event coverage
Rule body 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: medium
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
Provider_Name: "LsaSrv"
EventID:
- 6038
- 6039
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
Provider_Name | eq |
|