
title: CobaltStrike BOF Injection Pattern
author: Christian Burkard
date: 2021/08/04
description: Detects a typical pattern of a CobaltStrike BOF which inject into other
  processes
detection:
  SELECTION_1:
    EventID: 10
  SELECTION_2:
    CallTrace|re: ^C:\\\\Windows\\\\SYSTEM32\\\\ntdll\\.dll\+[a-z0-9]{4,6}\|C:\\\\Windows\\\\System32\\\\KERNELBASE\\.dll\+[a-z0-9]{4,6}\|UNKNOWN\([A-Z0-9]{16}\)$
  SELECTION_3:
    GrantedAccess:
    - '0x1028'
    - '0x1fffff'
  condition: (SELECTION_1 and SELECTION_2 and SELECTION_3)
falsepositives:
- unknown
id: 09706624-b7f6-455d-9d02-adee024cee1d
level: high
logsource:
  category: process_access
  product: windows
references:
- https://github.com/boku7/injectAmsiBypass
- https://github.com/boku7/spawn
status: experimental
tags:
- attack.execution
- attack.t1106
- attack.defense_evasion
- attack.t1562.001
ruletype: SIGMA
