Splunk unknown stable spl

Windows Multiple Accounts Deleted

The following analytic detects the deletion of more than five unique Windows accounts within a 10-minute period, using Event Code 4726 from the Windows Security Event Log. It leverages the `wineventlog_security` dataset, segmenting data into 10-minute intervals to identify suspicious account deletions. This activity is significant as it may indicate an attacker attempting to erase traces of their actions. If confirmed malicious, this could lead to unauthorized access removal, hindering incident response and forensic investigations.

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Detection Logic

`wineventlog_security` EventCode=4726 status=success
| bucket span=10m _time
| stats count dc(user) as unique_users values(user) as user values(dest) as dest
    BY EventCode signature _time
       src_user SubjectDomainName TargetDomainName
       Logon_ID
| where unique_users > 5
| `windows_multiple_accounts_deleted_filter`

False Positives

⚠ Service accounts may be responsible for the creation, deletion or modification of accounts for legitimate purposes. Filter as needed.

Field Validations

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