I just updated my CentOS 6 OSSEC server using the Atomic RPMs from 2.8.3-53
to 2.9.0-48.
Before the updates, my Windows server logs were process fine. After the
updates, ALL my windows logs are no longer being decoded correctly.
Using ossec-logtest, and a test log entry of
2017 Feb 08 19:00:00 WinEvtLog: Security: AUDIT_SUCCESS(4738):
Microsoft-Windows-Security-Auditing: (no user):
With 2.8.3-53, logtest reports:
**Phase 1: Completed pre-decoding.
full event: '2017 Feb 08 19:00:00 WinEvtLog: Security:
AUDIT_SUCCESS(4738): Microsoft-Windows-Security-Auditing: (no user):'
hostname: 'mybox'
program_name: '(null)'
log: '2017 Feb 08 19:00:00 WinEvtLog: Security: AUDIT_SUCCESS(4738):
Microsoft-Windows-Security-Auditing: (no user):'
**Phase 2: Completed decoding.
decoder: 'windows'
With 2.9.0, logtest reports:
**Phase 1: Completed pre-decoding.
full event: '2017 Feb 08 19:00:00 WinEvtLog: Security:
AUDIT_SUCCESS(4738): Microsoft-Windows-Security-Auditing: (no user):'
hostname: 'mybox'
program_name: 'WinEvtLog'
log: 'Security: AUDIT_SUCCESS(4738):
Microsoft-Windows-Security-Auditing: (no user):'
**Phase 2: Completed decoding.
No decoder matched.
BUT! If I drop off the date stamp prefix and just use the rest of the line,
IT WORKS!
WinEvtLog: Security: AUDIT_SUCCESS(4738):
Microsoft-Windows-Security-Auditing: (no user):
**Phase 1: Completed pre-decoding.
full event: 'WinEvtLog: Security: AUDIT_SUCCESS(4738):
Microsoft-Windows-Security-Auditing: (no user):'
hostname: 'tmgweb01'
program_name: '(null)'
log: 'WinEvtLog: Security: AUDIT_SUCCESS(4738):
Microsoft-Windows-Security-Auditing: (no user):'
**Phase 2: Completed decoding.
decoder: 'windows'
I've tried to play with the windows WinEvt decoder definition but I haven't
had any luck getting it to match with the date stamp.
I will say that my Windows servers are still running the 2.8.3 clients
because I can't find an install package for 2.9.0 yet.
Any ideas what's going on here? Help!
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