IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
Potential Relay Attack against a Domain Controller
editPotential Relay Attack against a Domain Controller
editIdentifies potential relay attacks against a domain controller (DC) by identifying authentication events using the domain controller computer account coming from other hosts to the DC that owns the account. Attackers may relay the DC hash after capturing it using forced authentication.
Rule type: eql
Rule indices:
- logs-system.security-*
- logs-windows.forwarded*
Severity: low
Risk score: 21
Runs every: 5m
Searches indices from: now-9m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References:
Tags:
- Domain: Endpoint
- OS: Windows
- Use Case: Threat Detection
- Tactic: Credential Access
- Data Source: Elastic Defend
- Data Source: Active Directory
- Use Case: Active Directory Monitoring
Version: 1
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule query
editauthentication where host.os.type == "windows" and event.code in ("4624", "4625") and endswith~(user.name, "$") and
winlog.event_data.AuthenticationPackageName : "NTLM" and winlog.logon.type : "network" and
/* Filter for a machine account that matches the hostname */
startswith~(host.name, substring(user.name, 0, -1)) and
/* Verify if the Source IP belongs to the host */
not endswith(string(source.ip), string(host.ip)) and
source.ip != null and source.ip != "::1" and source.ip != "127.0.0.1"
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Credential Access
- ID: TA0006
- Reference URL: https://attack.mitre.org/tactics/TA0006/
-
Technique:
- Name: Forced Authentication
- ID: T1187
- Reference URL: https://attack.mitre.org/techniques/T1187/
-
Technique:
- Name: Adversary-in-the-Middle
- ID: T1557
- Reference URL: https://attack.mitre.org/techniques/T1557/
-
Sub-technique:
- Name: LLMNR/NBT-NS Poisoning and SMB Relay
- ID: T1557.001
- Reference URL: https://attack.mitre.org/techniques/T1557/001/