Event ID 4733 — A member was removed from a security-enabled local group.
Description
A member was removed from a security-enabled local group.
Message #
Fields #
| Name | Description |
|---|---|
Account_Name | [Member] Account Name. |
Security_ID | [Member] Security ID. |
Group_Name | [Group] Group Name. |
Group_Domain | [Group] Group Domain. |
Security_ID | [Group] Security ID. |
Security_ID | [Subject] Security ID. |
Account_Name | [Subject] Account Name. |
Account_Domain | [Subject] Account Domain. |
Logon_ID | [Subject] Logon ID. |
Privileges | [Additional Information] Privileges. Privilege constants reference |
Example Event #
{
"system": {
"provider": "Microsoft-Windows-Security-Auditing",
"guid": "54849625-5478-4994-A5BA-3E3B0328C30D",
"event_source_name": "",
"event_id": 4733,
"version": 0,
"level": 0,
"task": 13826,
"opcode": 0,
"keywords": 9232379236109516800,
"time_created": "2013-10-23T16:22:40.036000Z",
"event_record_id": 117,
"correlation": {},
"execution": {
"process_id": 508,
"thread_id": 1032
},
"channel": "Security",
"computer": "IE8Win7",
"security": {
"user_id": ""
}
},
"event_data": {
"MemberName": "-",
"MemberSid": "S-1-5-21-3463664321-2923530833-3546627382-1000",
"TargetUserName": "Users",
"TargetDomainName": "Builtin",
"TargetSid": "S-1-5-32-545",
"SubjectUserSid": "S-1-5-18",
"SubjectUserName": "WIN-QALA5Q3KJ43$",
"SubjectDomainName": "WORKGROUP",
"SubjectLogonId": "0x3e7",
"PrivilegeList": "-"
}
}
Detection Patterns #
User Account
Security-Auditing Event ID 4720: A user account was created.ANDEvent ID 4722: A user account was enabled.ANDEvent ID 4723: An attempt was made to change an account's password.ANDEvent ID 4724: An attempt was made to reset an account's password.ANDEvent ID 4725: A user account was disabled.ANDEvent ID 4726: A user account was deleted.ANDEvent ID 4728: A member was added to a security-enabled global group.ANDEvent ID 4732: A member was added to a security-enabled local group.ANDEvent ID 4733: A member was removed from a security-enabled local group.ANDEvent ID 4738: A user account was changed.ANDEvent ID 4743: A computer account was deleted.ANDEvent ID 4780: The ACL was set on accounts which are members of administrators groups.
6 rules
References #
- Microsoft Learn https://learn.microsoft.com/en-us/windows/security/threat-protection/auditing/event-4733
- Microsoft Learn Audit Policy https://learn.microsoft.com/en-us/windows/security/threat-protection/auditing/audit-security-group-management
- Ultimate Windows Security https://www.ultimatewindowssecurity.com/securitylog/encyclopedia/event.aspx?eventid=4733
- Example event sourced from https://github.com/NextronSystems/evtx-baseline