Comprehensive and Detailed
Understanding the Security Event:
Administrator accounts are highly privileged and require strict monitoring.
Server 4 shows failed login attempts for the administrator account. This could indicate a brute-force attack or unauthorized access attempt.
The fact that none of the admin login attempts were successful suggests someone was trying to guess the credentials.
Why Option D is Correct:
Failed logins for administrator accounts are a critical security concern.
If an attacker gains access, they could escalate privileges and compromise the network.
Investigating unauthorized admin login attempts should be the top priority in a log audit.
Why Other Options Are Incorrect:
A (Endpoint not submitting logs): While this is concerning, it does not indicate an active attack.
B (Lateral movement): There's no evidence of a compromised account moving between servers yet.
C (Misconfigured syslog server): False negatives are a possibility, but the failed admin logins are real.
Reference:
CompTIA SecurityX CAS-005 Official Study Guide: SIEM & Incident Analysis