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

title, excerpt, categories, last_modified_at, toc, toc_label, tags

title	excerpt	categories	last_modified_at	toc	toc_label	tags
Recon Using WMI Class	Gather Victim Host Information	Endpoint	2021-06-10	true		Gather Victim Host Information Reconnaissance Splunk Enterprise Splunk Enterprise Security Splunk Cloud

Try in Splunk Security Cloud{: .btn .btn--success}

Description

The following analytic identifies suspicious PowerShell via EventCode 4104, where WMI is performing an event query looking for running processes or running services. This technique is commonly found where the adversary will identify services and system information on the compromised machine. During triage, review parallel processes within the same timeframe. Review the full script block to identify other related artifacts.

• Type: TTP
• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel:
• Last Updated: 2021-06-10
• Author: Teoderick Contreras, Splunk
• ID: 018c1972-ca07-11eb-9473-acde48001122

ATT&CK

ID	Technique	Tactic
T1592	Gather Victim Host Information	Reconnaissance

Search

`powershell` EventCode=4104 (Message= "*SELECT*" OR Message= "*Get-WmiObject*") AND (Message= "*Win32_Bios*" OR Message= "*Win32_OperatingSystem*" OR Message= "*Win32_Processor*" OR Message= "*Win32_ComputerSystem*" OR Message= "*Win32_ComputerSystemProduct*" OR Message= "*Win32_ShadowCopy*") 
| stats count min(_time) as firstTime max(_time) as lastTime by EventCode Message ComputerName User 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `recon_using_wmi_class_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
• EventCode
• Message
• ComputerName
• User

Kill Chain Phase

• Reconnaissance

Known False Positives

network administrator may used this command for checking purposes

RBA

Risk Score	Impact	Confidence	Message
60.0	75	80	A suspicious powershell script contains host recon command in Message with EventCode EventCode in host ComputerName

Reference

• https://news.sophos.com/en-us/2020/05/12/maze-ransomware-1-year-counting/
• 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/honeypots/pwsh/windows-powershell.log

source | version: 1