Failed Logins with Different Accounts from Single Source System

 1title: Failed Logins with Different Accounts from Single Source System
 2id: e98374a6-e2d9-4076-9b5c-11bdb2569995
 3status: unsupported
 4description: Detects suspicious failed logins with different user accounts from a single source system
 5author: Florian Roth (Nextron Systems)
 6date: 2017/01/10
 7modified: 2023/02/24
 8tags:
 9    - attack.persistence
10    - attack.privilege_escalation
11    - attack.t1078
12logsource:
13    product: windows
14    service: security
15detection:
16    selection1:
17        EventID:
18            - 529
19            - 4625
20        TargetUserName: '*'
21        WorkstationName: '*'
22    condition: selection1 | count(TargetUserName) by WorkstationName > 3
23falsepositives:
24    - Terminal servers
25    - Jump servers
26    - Other multiuser systems like Citrix server farms
27    - Workstations with frequently changing users
28level: medium