blue-team-tools/linux/susp_failed_logons_single_source.yml

title: Multiple Failed Logins with Different Accounts from Single Source System
description: Detects suspicious failed logins with different user accounts from a single source system 
detection:
    selection:
        - log: auth
          pam_user: not null
          pam_rhost: not null
    timeframe: last 24h 
    condition: selection | count(pam_user) by pam_rhost > 3
falsepositives:
    - Terminal servers
    - Jump servers
    - Workstations with frequently changing users 
level: 40