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
|T1027||Obfuscated Files or Information||Defense Evasion|
|T1027.005||Indicator Removal from Tools||Defense Evasion|
`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
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.
Kill Chain Phase
Known False Positives
network operator may enable or disable this windows feature.
source | version: 1