Windows DnsAdmins New Member Added
The following analytic leverages Event ID 4732 to identify the addition of a new member to the DnsAdmins group within Active Directory. . Members of the DnsAdmin group can manage the DNS service which most of the times runs on the Domain Controller. By abusing legitimate DNS management functionality, a member of the DnsAdmins group can escalate privileges by executing malicious code on a Domain Controller as SYSTEM. Security teams should monitor the modification of the DnsAdmins group and validate the changes are legitimate.
- Type: TTP
Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Last Updated: 2023-04-06
- Author: Mauricio Velazco, Splunk
- ID: 27e600aa-77f8-4614-bc80-2662a67e2f48
Kill Chain Phase
- CIS 10
1 2 3 4 5 `wineventlog_security` EventCode=4732 TargetUserName=DnsAdmins | stats min(_time) as firstTime max(_time) as lastTime values(SubjectUserName) values(Computer) by MemberSid, TargetUserName | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `windows_dnsadmins_new_member_added_filter`
The SPL above uses the following Macros:
windows_dnsadmins_new_member_added_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
List of fields required to use this analytic.
How To Implement
To successfully implement this search, Domain Controller events need to be ingested. The Advanced Security Audit policy setting
Audit Security Group Management within
Account Management needs to be enabled.
Known False Positives
New members can be added to the DnsAdmins group as part of legitimate administrative tasks. Filter as needed.
Associated Analytic Story
|40.0||80||50||A new member was added to the DnsAdmins group by $SubjectUserName$|
The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.
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