splunk-security_content/docs/_posts/2021-06-10-powershell_domain_enumeration.md

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title	excerpt	categories	last_modified_at	toc	toc_label	tags
PowerShell Domain Enumeration	Command and Scripting Interpreter, PowerShell	Endpoint	2021-06-10	true		Command and Scripting Interpreter Execution PowerShell Execution Splunk Enterprise Splunk Enterprise Security Splunk Cloud

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Description

The following analytic utilizes PowerShell Script Block Logging (EventCode=4104) to identify suspicious PowerShell execution. Script Block Logging captures the command sent to PowerShell, the full command to be executed. Upon enabling, logs will output to Windows event logs. Dependent upon volume, enable on critical endpoints or all.
This analytic identifies specific PowerShell modules typically used to enumerate an organizations domain or users.
During triage, review parallel processes using an EDR product or 4688 events. It will be important to understand the timeline of events around this activity. Review the entire logged PowerShell script block.

• Type: TTP
• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel:
• Last Updated: 2021-06-10
• Author: Michael Haag, Splunk
• ID: e1866ce2-ca22-11eb-8e44-acde48001122

ATT&CK

ID	Technique	Tactic
T1059	Command and Scripting Interpreter	Execution

| T1059.001 | PowerShell | Execution |

Search

`powershell` EventCode=4104 Message IN (*get-netdomaintrust*, *get-netforesttrust*, *get-addomain*, *get-adgroupmember*, *get-domainuser*) 
| stats count min(_time) as firstTime max(_time) as lastTime by ComputerName EventCode Message 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `powershell_domain_enumeration_filter`

Associated Analytic Story

• Malicious PowerShell

How To Implement

To successfully implement this analytic, you will need to enable PowerShell Script Block Logging on some or all endpoints. Additional setup here https://docs.splunk.com/Documentation/UBA/5.0.4.1/GetDataIn/AddPowerShell#Configure_module_logging_for_PowerShell.

Required field

• _time
• Message
• ComputerName
• EventCode

Kill Chain Phase

• Reconnaissance

Known False Positives

It is possible there will be false positives, filter as needed.

RBA

Risk Score	Impact	Confidence	Message
42.0	60	70	A suspicious powershell script contains domain enumeration command in Message with EventCode EventCode in host ComputerName

Reference

• https://docs.splunk.com/Documentation/UBA/5.0.4.1/GetDataIn/AddPowerShell#Configure_module_logging_for_PowerShell.
• https://blog.palantir.com/tampering-with-windows-event-tracing-background-offense-and-defense-4be7ac62ac63
• https://static1.squarespace.com/static/552092d5e4b0661088167e5c/t/59c1814829f18782e24f1fe2/1505853768977/Windows+PowerShell+Logging+Cheat+Sheet+ver+Sept+2017+v2.1.pdf
• https://www.crowdstrike.com/blog/investigating-powershell-command-and-script-logging/

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

• https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1059.001/powershell_script_block_logging/windows-powershell.log

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