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docs/detections/prebuilt-rules/downloadable-packages/8-12-25/prebuilt-rule-8-12-25-active-directory-forced-authentication-from-linux-host-smb-named-pipes.asciidoc

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+[[prebuilt-rule-8-12-25-active-directory-forced-authentication-from-linux-host-smb-named-pipes]]
+=== Active Directory Forced Authentication from Linux Host - SMB Named Pipes
+
+Identifies a potential forced authentication using related SMB named pipes. Attackers may attempt to force targets to authenticate to a host controlled by them to capture hashes or enable relay attacks.
+
+*Rule type*: eql
+
+*Rule indices*: 
+
+* logs-endpoint.events.network-*
+* logs-system.security-*
+* winlogbeat-*
+
+*Severity*: medium
+
+*Risk score*: 47
+
+*Runs every*: 5m
+
+*Searches indices from*: now-9m ({ref}/common-options.html#date-math[Date Math format], see also <<rule-schedule, `Additional look-back time`>>)
+
+*Maximum alerts per execution*: 100
+
+*References*: 
+
+* https://github.com/p0dalirius/windows-coerced-authentication-methods
+* https://www.thehacker.recipes/a-d/movement/mitm-and-coerced-authentications
+* https://attack.mitre.org/techniques/T1187/
+
+*Tags*: 
+
+* Domain: Endpoint
+* OS: Windows
+* OS: Linux
+* Use Case: Threat Detection
+* Tactic: Credential Access
+* Data Source: Elastic Defend
+* Data Source: Active Directory
+* Use Case: Active Directory Monitoring
+* Data Source: System
+
+*Version*: 3
+
+*Rule authors*: 
+
+* Elastic
+
+*Rule license*: Elastic License v2
+
+
+==== Setup
+
+
+
+*Setup*
+
+
+This rule uses Elastic Endpoint network events from Linux hosts and system integration events from Domain controllers
+for correlation. Both data sources should be collected from the hosts for this detection to work.
+
+The 'Audit Detailed File Share' audit policy must be configured (Success Failure).
+Steps to implement the logging policy with Advanced Audit Configuration:
+```
+Computer Configuration >
+Policies >
+Windows Settings >
+Security Settings >
+Advanced Audit Policies Configuration >
+Audit Policies >
+Object Access >
+Audit Detailed File Share (Success,Failure)
+```
+
+
+==== Rule query
+
+
+[source, js]
+----------------------------------
+sequence with maxspan=15s
+[network where host.os.type == "linux" and event.action == "connection_attempted" and destination.port == 445 and not startswith~(string(destination.ip), string(host.ip))] by host.ip, data_stream.namespace
+[file where host.os.type == "windows" and event.code == "5145" and file.name : ("Spoolss", "netdfs", "lsarpc", "lsass", "netlogon", "samr", "efsrpc", "FssagentRpc")] by source.ip, data_stream.namespace
+
+----------------------------------
+
+*Framework*: MITRE ATT&CK^TM^
+
+* 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/

docs/detections/prebuilt-rules/downloadable-packages/8-12-25/prebuilt-rule-8-12-25-enumerating-domain-trusts-via-nltest-exe.asciidoc

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+[[prebuilt-rule-8-12-25-enumerating-domain-trusts-via-nltest-exe]]
+=== Enumerating Domain Trusts via NLTEST.EXE
+
+Identifies the use of nltest.exe for domain trust discovery purposes. Adversaries may use this command-line utility to enumerate domain trusts and gain insight into trust relationships, as well as the state of Domain Controller (DC) replication in a Microsoft Windows NT Domain.
+
+*Rule type*: eql
+
+*Rule indices*: 
+
+* winlogbeat-*
+* logs-endpoint.events.process-*
+* logs-windows.forwarded*
+* logs-windows.sysmon_operational-*
+* endgame-*
+* logs-system.security*
+* logs-m365_defender.event-*
+
+*Severity*: low
+
+*Risk score*: 21
+
+*Runs every*: 5m
+
+*Searches indices from*: now-9m ({ref}/common-options.html#date-math[Date Math format], see also <<rule-schedule, `Additional look-back time`>>)
+
+*Maximum alerts per execution*: 100
+
+*References*: 
+
+* https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-r2-and-2012/cc731935(v=ws.11)
+* https://redcanary.com/blog/how-one-hospital-thwarted-a-ryuk-ransomware-outbreak/
+
+*Tags*: 
+
+* Domain: Endpoint
+* OS: Windows
+* Use Case: Threat Detection
+* Tactic: Discovery
+* Data Source: Elastic Endgame
+* Resources: Investigation Guide
+* Data Source: Elastic Defend
+* Data Source: System
+* Data Source: Microsoft Defender for Endpoint
+* Data Source: Sysmon
+
+*Version*: 113
+
+*Rule authors*: 
+
+* Elastic
+
+*Rule license*: Elastic License v2
+
+
+==== Investigation guide
+
+
+
+*Triage and analysis*
+
+
+
+*Investigating Enumerating Domain Trusts via NLTEST.EXE*
+
+
+Active Directory (AD) domain trusts define relationships between domains within a Windows AD environment. In this setup, a "trusting" domain permits users from a "trusted" domain to access resources. These trust relationships can be configurable as one-way, two-way, transitive, or non-transitive, enabling controlled access and resource sharing across domains.
+
+This rule identifies the usage of the `nltest.exe` utility to enumerate domain trusts. Attackers can use this information to enable the next actions in a target environment, such as lateral movement.
+
+
+*Possible investigation steps*
+
+
+- Investigate the process execution chain (parent process tree) for unknown processes. Examine their executable files for prevalence, whether they are located in expected locations, and if they are signed with valid digital signatures.
+- Identify the user account that performed the action and whether it should perform this kind of action.
+- Investigate other alerts associated with the user/host during the past 48 hours.
+
+
+*False positive analysis*
+
+
+- Discovery activities are not inherently malicious if they occur in isolation and are done within the user business context (e.g., an administrator in this context). As long as the analyst did not identify suspicious activity related to the user or host, such alerts can be dismissed.
+
+
+*Related rules*
+
+
+- Enumerating Domain Trusts via DSQUERY.EXE - 06a7a03c-c735-47a6-a313-51c354aef6c3
+
+
+*Response and remediation*
+
+
+- Initiate the incident response process based on the outcome of the triage.
+- Isolate the involved hosts to prevent further post-compromise behavior.
+- Restrict PowerShell usage outside of IT and engineering business units using GPOs, AppLocker, Intune, or similar software.
+- Determine the initial vector abused by the attacker and take action to prevent reinfection through the same vector.
+- Run a full antimalware scan. This may reveal additional artifacts left in the system, persistence mechanisms, and malware components.
+- Using the incident response data, update logging and audit policies to improve the mean time to detect (MTTD) and the mean time to respond (MTTR).
+
+
+==== Rule query
+
+
+[source, js]
+----------------------------------
+process where host.os.type == "windows" and event.type == "start" and
+    process.name : "nltest.exe" and process.args : (
+        "/DCLIST:*", "/DCNAME:*", "/DSGET*",
+        "/LSAQUERYFTI:*", "/PARENTDOMAIN",
+        "/DOMAIN_TRUSTS", "/BDC_QUERY:*"
+        ) and 
+not process.parent.name : "PDQInventoryScanner.exe" and 
+not user.id in ("S-1-5-18", "S-1-5-19", "S-1-5-20")
+
+----------------------------------
+
+*Framework*: MITRE ATT&CK^TM^
+
+* Tactic:
+** Name: Discovery
+** ID: TA0007
+** Reference URL: https://attack.mitre.org/tactics/TA0007/
+* Technique:
+** Name: Remote System Discovery
+** ID: T1018
+** Reference URL: https://attack.mitre.org/techniques/T1018/
+* Technique:
+** Name: Domain Trust Discovery
+** ID: T1482
+** Reference URL: https://attack.mitre.org/techniques/T1482/

docs/detections/prebuilt-rules/downloadable-packages/8-12-25/prebuilt-rule-8-12-25-enumeration-of-administrator-accounts.asciidoc

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+[[prebuilt-rule-8-12-25-enumeration-of-administrator-accounts]]
+=== Enumeration of Administrator Accounts
+
+Identifies instances of lower privilege accounts enumerating Administrator accounts or groups using built-in Windows tools.
+
+*Rule type*: eql
+
+*Rule indices*: 
+
+* logs-endpoint.events.process-*
+* winlogbeat-*
+* logs-windows.forwarded*
+* endgame-*
+* logs-system.security*
+* logs-m365_defender.event-*
+
+*Severity*: low
+
+*Risk score*: 21
+
+*Runs every*: 5m
+
+*Searches indices from*: now-9m ({ref}/common-options.html#date-math[Date Math format], see also <<rule-schedule, `Additional look-back time`>>)
+
+*Maximum alerts per execution*: 100
+
+*References*: None
+
+*Tags*: 
+
+* Domain: Endpoint
+* OS: Windows
+* Use Case: Threat Detection
+* Tactic: Discovery
+* Resources: Investigation Guide
+* Data Source: Elastic Endgame
+* Data Source: Elastic Defend
+* Data Source: System
+* Data Source: Microsoft Defender for Endpoint
+
+*Version*: 114
+
+*Rule authors*: 
+
+* Elastic
+
+*Rule license*: Elastic License v2
+
+
+==== Investigation guide
+
+
+
+*Triage and analysis*
+
+
+
+*Investigating Enumeration of Administrator Accounts*
+
+
+After successfully compromising an environment, attackers may try to gain situational awareness to plan their next steps. This can happen by running commands to enumerate network resources, users, connections, files, and installed security software.
+
+This rule looks for the execution of the `net` and `wmic` utilities to enumerate administrator-related users or groups in the domain and local machine scope. Attackers can use this information to plan their next steps of the attack, such as mapping targets for credential compromise and other post-exploitation activities.
+
+
+*Possible investigation steps*
+
+
+- Investigate the process execution chain (parent process tree) for unknown processes. Examine their executable files for prevalence, whether they are located in expected locations, and if they are signed with valid digital signatures.
+- Identify the user account that performed the action and whether it should perform this kind of action.
+- Investigate other alerts associated with the user/host during the past 48 hours.
+- Investigate any abnormal account behavior, such as command executions, file creations or modifications, and network connections.
+
+
+*False positive analysis*
+
+
+- Discovery activities are not inherently malicious if they occur in isolation. As long as the analyst did not identify suspicious activity related to the user or host, such alerts can be dismissed.
+
+
+*Related rules*
+
+
+- AdFind Command Activity - eda499b8-a073-4e35-9733-22ec71f57f3a
+
+
+*Response and remediation*
+
+
+- Initiate the incident response process based on the outcome of the triage.
+- Isolate the involved hosts to prevent further post-compromise behavior.
+- Investigate credential exposure on systems compromised or used by the attacker to ensure all compromised accounts are identified. Reset passwords for these accounts and other potentially compromised credentials, such as email, business systems, and web services.
+- Run a full antimalware scan. This may reveal additional artifacts left in the system, persistence mechanisms, and malware components.
+- Determine the initial vector abused by the attacker and take action to prevent reinfection through the same vector.
+- Using the incident response data, update logging and audit policies to improve the mean time to detect (MTTD) and the mean time to respond (MTTR).
+
+
+==== Rule query
+
+
+[source, js]
+----------------------------------
+process where host.os.type == "windows" and event.type == "start" and
+(
+  (
+    (
+      (process.name : "net.exe" or ?process.pe.original_file_name == "net.exe") or
+      ((process.name : "net1.exe" or ?process.pe.original_file_name == "net1.exe") and not process.parent.name : "net.exe")
+    ) and
+    process.args : ("group", "user", "localgroup") and
+    process.args : ("*admin*", "Domain Admins", "Remote Desktop Users", "Enterprise Admins", "Organization Management")
+    and not process.args : ("/add", "/delete")
+  ) or
+  (
+    (process.name : "wmic.exe" or ?process.pe.original_file_name == "wmic.exe") and
+    process.args : ("group", "useraccount")
+  )
+) and not user.id : ("S-1-5-18", "S-1-5-19", "S-1-5-20")
+
+----------------------------------
+
+*Framework*: MITRE ATT&CK^TM^
+
+* Tactic:
+** Name: Discovery
+** ID: TA0007
+** Reference URL: https://attack.mitre.org/tactics/TA0007/
+* Technique:
+** Name: Permission Groups Discovery
+** ID: T1069
+** Reference URL: https://attack.mitre.org/techniques/T1069/
+* Sub-technique:
+** Name: Local Groups
+** ID: T1069.001
+** Reference URL: https://attack.mitre.org/techniques/T1069/001/
+* Sub-technique:
+** Name: Domain Groups
+** ID: T1069.002
+** Reference URL: https://attack.mitre.org/techniques/T1069/002/
+* Technique:
+** Name: Account Discovery
+** ID: T1087
+** Reference URL: https://attack.mitre.org/techniques/T1087/
+* Sub-technique:
+** Name: Local Account
+** ID: T1087.001
+** Reference URL: https://attack.mitre.org/techniques/T1087/001/
+* Sub-technique:
+** Name: Domain Account
+** ID: T1087.002
+** Reference URL: https://attack.mitre.org/techniques/T1087/002/