splunk-security_content/docs/_posts/2021-06-22-powershell_enable_smb1protocol_feature.md

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

title	excerpt	categories	last_modified_at	toc	toc_label	tags
Powershell Enable SMB1Protocol Feature	Obfuscated Files or Information, Indicator Removal from Tools	Endpoint	2021-06-22	true		TTP T1027 Obfuscated Files or Information Defense Evasion T1027.005 Indicator Removal from Tools Defense Evasion Splunk Enterprise Splunk Enterprise Security Splunk Cloud Endpoint Exploitation

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Description

This search is to detect a suspicious enabling of smb1protocol through "powershell.exe". This technique was seen in some ransomware (like reddot) where it enable smb share to do the lateral movement and encrypt other files within the compromise network system.

• Type: TTP
• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel: Endpoint
• Last Updated: 2021-06-22
• Author: Teoderick Contreras, Splunk
• ID: afed80b2-d34b-11eb-a952-acde48001122

ATT&CK

ID	Technique	Tactic
T1027	Obfuscated Files or Information	Defense Evasion
T1027.005	Indicator Removal from Tools	Defense Evasion

Search

`powershell` EventCode=4104 Message = "*Enable-WindowsOptionalFeature*" Message = "*SMB1Protocol*" 
| stats count min(_time) as firstTime max(_time) as lastTime by EventCode Message ComputerName User 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `powershell_enable_smb1protocol_feature_filter`

Associated Analytic Story

• Malicious PowerShell
• Ransomware

How To Implement

To successfully implement this search, you need to be ingesting logs with the powershell logs from your endpoints. make sure you enable needed registry to monitor this event.

Required field

• _time
• EventCode
• Message
• ComputerName
• User

Kill Chain Phase

• Exploitation

Known False Positives

network operator may enable or disable this windows feature.

Reference

• https://app.any.run/tasks/c0f98850-af65-4352-9746-fbebadee4f05/

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/malware/ransomware_ttp/data2/windows-powershell.log

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