Techniques
Sample rules
Windows Multiple Accounts Deleted
- source: splunk
- technicques:
- T1098
- T1078
Description
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.
Detection logic
`wineventlog_security` EventCode=4726 status=success
| bucket span=10m _time
| stats count dc(user) as unique_users values(user) as user by EventCode signature _time src_user SubjectDomainName TargetDomainName Logon_ID
| where unique_users > 5
| `windows_multiple_accounts_deleted_filter`
Windows Multiple Account Passwords Changed
- source: splunk
- technicques:
- T1098
- T1078
Description
The following analytic detects instances where more than five unique Windows account passwords are changed within a 10-minute interval. It leverages Event Code 4724 from the Windows Security Event Log, using the wineventlog_security dataset to monitor and count distinct TargetUserName values. This behavior is significant as rapid password changes across multiple accounts are unusual and may indicate unauthorized access or internal compromise. If confirmed malicious, this activity could lead to widespread account compromise, unauthorized access to sensitive information, and potential disruption of services.
Detection logic
`wineventlog_security` EventCode=4724 status=success
| bucket span=10m _time
| stats count dc(user) as unique_users values(user) as user by EventCode signature _time src_user SubjectDomainName TargetDomainName Logon_ID
| where unique_users > 5
| `windows_multiple_account_passwords_changed_filter`
Windows Multiple Accounts Disabled
- source: splunk
- technicques:
- T1098
- T1078
Description
The following analytic identifies instances where more than five unique Windows accounts are disabled within a 10-minute window, as indicated by Event Code 4725 in the Windows Security Event Log. It leverages the wineventlog_security dataset, grouping data into 10-minute segments and tracking the count and distinct count of TargetUserName. This behavior is significant as it may indicate internal policy breaches or an external attacker’s attempt to disrupt operations. If confirmed malicious, this activity could lead to widespread account lockouts, hindering user access and potentially disrupting business operations.
Detection logic
`wineventlog_security` EventCode=4725 status=success
| bucket span=10m _time
| stats count dc(user) as unique_users values(user) as user by EventCode signature _time src_user SubjectDomainName TargetDomainName Logon_ID
| where unique_users > 5
| `windows_multiple_accounts_disabled_filter`