HackTool - EfsPotato Named Pipe Creation

Title: HackTool - EfsPotato Named Pipe Creation
Status: test
Description:Detects the pattern of a pipe name as used by the hack tool EfsPotato
References:
  -https://twitter.com/SBousseaden/status/1429530155291193354?s=20
  -https://github.com/zcgonvh/EfsPotato
Author: Florian Roth (Nextron Systems)
Date: 2021-08-23
modified:2023-12-21
Tags:

• -'attack.privilege-escalation'
• -'attack.stealth'
• -'attack.t1055'

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|contains:
      -'\pipe\'
      -'\pipe\srvsvc'

  filter_optional_ctx:
    PipeName|contains: '\CtxShare'
  filter_optional_default:
    PipeName|startswith: '\pipe\'
  condition:selection and not 1 of filter_optional_*
Falsepositives:
  -\pipe\LOCAL\Monitorian
Level: high