Permissions on an object were changed
SACLs or DACLs on a file, registry key, or system object were modified.
Event ID 4670 documents when security permissions (`SDDL` descriptors) are changed on an object. Attackers often alter file or registry permissions (`take ownership` or grant `Full Control` to `Everyone`) to overwrite protected system binaries (`icacls`, `takeown`).
Failure Reason / Root Cause:
IT permission adjustments, or attacker weakening DACLs on `C:\Windows\System32\` files to replace system executables.
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>4670</EventID>
<Version>0</Version>
<Level>0</Level>
<Task>12544</Task>
<Opcode>0</Opcode>
<Keywords>0x8020000000000000</Keywords>
<TimeCreated SystemTime="2026-07-17T09:54:44.873Z" />
<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 Permissions on an object were changed -->
</EventData>
</Event>MITRE ATT&CK mapping
| ID | Technique | Tactic |
|---|---|---|
T1222.001 | File and Directory Permissions Modification | Defense Evasion |
Recommended actions
- Alert on any Event 4670 altering permissions (`DACL changed`) on system service binaries or critical registry keys (`Run`, `Services`).