
title: Failed Logins with Different Accounts from Single Source System
author: Florian Roth
date: 2017/01/10
description: Detects suspicious failed logins with different user accounts from a
  single source system
detection:
  SELECTION_1:
    EventID: 4776
  SELECTION_2:
    TargetUserName: '*'
  SELECTION_3:
    Workstation: '*'
  condition: (SELECTION_1 and SELECTION_2 and SELECTION_3) | count(TargetUserName)
    by Workstation > 3
falsepositives:
- Terminal servers
- Jump servers
- Other multiuser systems like Citrix server farms
- Workstations with frequently changing users
id: 6309ffc4-8fa2-47cf-96b8-a2f72e58e538
level: medium
logsource:
  product: windows
  service: security
modified: 2021/09/21
related:
- id: e98374a6-e2d9-4076-9b5c-11bdb2569995
  type: derived
status: experimental
tags:
- attack.persistence
- attack.privilege_escalation
- attack.t1078
ruletype: SIGMA
