New PowerShell Instance Created

Title: New PowerShell Instance Created
Status: test
Description:Detects the execution of PowerShell via the creation of a named pipe starting with PSHost
References:
  -https://threathunterplaybook.com/hunts/windows/190610-PwshAlternateHosts/notebook.html
  -https://threathunterplaybook.com/hunts/windows/190410-LocalPwshExecution/notebook.html
Author: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research)
Date: 2019-09-12
modified:2023-11-30
Tags:

• -'attack.execution'
• -'attack.t1059.001'

Logsource:

• product: windows
• category: pipe_created
• definition: Note that you have to configure logging for Named Pipe Events in Sysmon config (Event ID 17 and Event ID 18). The basic configuration is in popular sysmon configuration (https://github.com/SwiftOnSecurity/sysmon-config), but it is worth verifying. You can also use other repo, e.g. https://github.com/Neo23x0/sysmon-config, https://github.com/olafhartong/sysmon-modular. How to test detection? You can check powershell script from this site https://svch0st.medium.com/guide-to-named-pipes-and-hunting-for-cobalt-strike-pipes-dc46b2c5f575

Detection:
  selection:
    PipeName|startswith: '\PSHost'
  condition:selection
Falsepositives:
  -Likely
Level: informational