title: EfsPotato Named Pipe
id: 637f689e-b4a5-4a86-be0e-0100a0a33ba2
status: experimental
description: Detects the pattern of a pipe name as used by the tool EfsPotato
references:
   - https://twitter.com/SBousseaden/status/1429530155291193354?s=20
   - https://github.com/zcgonvh/EfsPotato
date: 2021/08/23
modified: 2022/06/20
author: Florian Roth
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'  # more specific version (use only this one of the other causes too many false positives)
   filter:
      PipeName|contains: '\CtxShare'
   condition: selection and not filter
tags:
   - attack.defense_evasion
   - attack.privilege_escalation
   - attack.t1055
falsepositives:
   - Unknown
level: high
