Remote Computer Account DnsHostName Update
editRemote Computer Account DnsHostName Update
editIdentifies the remote update to a computer account’s DnsHostName attribute. If the new value set is a valid domain controller DNS hostname and the subject computer name is not a domain controller, then it’s highly likely a preparation step to exploit CVE-2022-26923 in an attempt to elevate privileges from a standard domain user to domain admin privileges.
Rule type: eql
Rule indices:
- winlogbeat-*
- logs-system.*
Severity: high
Risk score: 73
Runs every: 5 minutes
Searches indices from: now-9m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References:
Tags:
- Elastic
- Host
- Windows
- Threat Detection
- Privilege Escalation
- Active Directory
Version: 2 (version history)
Added (Elastic Stack release): 8.3.0
Last modified (Elastic Stack release): 8.4.0
Rule authors: Elastic
Rule license: Elastic License v2
Rule query
editsequence by host.id with maxspan=5m [authentication where event.action == "logged-in" and winlog.logon.type == "Network" and event.outcome == "success" and not user.name == "ANONYMOUS LOGON" and not winlog.event_data.SubjectUserName : "*$" and not user.domain == "NT AUTHORITY" and source.ip != "127.0.0.1" and source.ip !="::1"] by winlog.event_data.TargetLogonId [iam where event.action == "changed-computer-account" and /* if DnsHostName value equal a DC DNS hostname then it's highly suspicious */ winlog.event_data.DnsHostName : "??*"] by winlog.event_data.SubjectLogonId
Threat mapping
editFramework: MITRE ATT&CKTM
-
Tactic:
- Name: Privilege Escalation
- ID: TA0004
- Reference URL: https://attack.mitre.org/tactics/TA0004/
-
Technique:
- Name: Exploitation for Privilege Escalation
- ID: T1068
- Reference URL: https://attack.mitre.org/techniques/T1068/
Rule version history
edit- Version 2 (8.4.0 release)
-
- Formatting only