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.*
- logs-windows.*
Severity: high
Risk score: 73
Runs every: 5m
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: 103
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule query
editsequence by winlog.computer_name 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 : "??*" and
/* exclude FPs where DnsHostName starts with the ComputerName that was changed */
not startswith~(winlog.event_data.DnsHostName, substring(winlog.event_data.TargetUserName, 0, length(winlog.event_data.TargetUserName) - 1))
] by winlog.event_data.SubjectLogonId
Framework: 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/
-
Technique:
- Name: Valid Accounts
- ID: T1078
- Reference URL: https://attack.mitre.org/techniques/T1078/
-
Sub-technique:
- Name: Domain Accounts
- ID: T1078.002
- Reference URL: https://attack.mitre.org/techniques/T1078/002/