A computer account was deleted from AD.
Deletion of computer accounts disrupts domain authentication for affected machines. Sabotage or cleanup.
Alert: deletion of DC or server computer accounts. Alert: outside business hours.
SubjectUserNameTargetUserNameLogonTypeIpAddressWorkstationName Starting points — adapt the log source, projected fields and thresholds for your environment.
SecurityEvent
| where EventID == 4743 // A computer account was deleted
| project TimeGenerated, Computer, SubjectUserName, TargetUserName, LogonType, IpAddress, WorkstationName
| sort by TimeGenerated descindex=* sourcetype="WinEventLog:Security" EventCode=4743
| stats count earliest(_time) as first_seen latest(_time) as last_seen by ComputerName
| sort - count `# A computer account was deleted — add EventData fields: SubjectUserName, TargetUserName, LogonType, IpAddress`A computer account was deleted. A computer account was deleted from AD.
Event 4743 is written to the Security channel by Microsoft-Windows-Security-Auditing. Advanced Audit Policy — enable the 'Account Management' subcategory (Success and/or Failure).
Alert: deletion of DC or server computer accounts. Alert: outside business hours.