A security-enabled local group was changed
Properties of a local security group or AD Domain Local group (`SAM Account Name`, `Description`, `Group Type`) were altered.
Event ID 4735 logs when the attributes of a security-enabled local group are modified (such as changing scope or description). Adversaries sometimes rename high-privilege groups or alter group types to evade basic name-matching SIEM rules.
Failure Reason / Root Cause:
Modification of local/domain local group attributes (`TargetUserName`).
Raw Event XML snippet
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-Security-Auditing" Guid="{54849625-5478-4994-A5BA-3E3B0328C30D}" />
<EventID>4735</EventID>
<Version>0</Version>
<Level>0</Level>
<Task>12544</Task>
<Opcode>0</Opcode>
<Keywords>0x8020000000000000</Keywords>
<TimeCreated SystemTime="2026-07-17T09:54:44.898Z" />
<EventRecordID>1048576</EventRecordID>
<Correlation />
<Execution ProcessID="612" ThreadID="1024" />
<Channel>Security</Channel>
<Computer>DC01.enterprise.internal</Computer>
<Security />
</System>
<EventData>
<Data Name="SubjectUserSid">S-1-5-18</Data>
<Data Name="SubjectUserName">SYSTEM</Data>
<Data Name="SubjectDomainName">NT AUTHORITY</Data>
<Data Name="SubjectLogonId">0x3e7</Data>
<!-- Event telemetry fields specific to A security-enabled local group was changed -->
</EventData>
</Event>MITRE ATT&CK mapping
| ID | Technique | Tactic |
|---|---|---|
T1098 | Impair Defenses / Account Manipulation | Defense Evasion |
Recommended actions
- Inspect `sAMAccountName` and `GroupType` changes to detect renaming of sensitive security groups.