(CAPA) CAPA_Trap_Flag

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rule:
  meta:
    name: check for trap flag exception
    namespace: anti-analysis/anti-debugging/debugger-detection
    authors:
      - michael.hunhoff@mandiant.com
    scope: basic block
    mbc:
      - Anti-Behavioral Analysis::Debugger Detection [B0001]
    references:
      - https://github.com/LordNoteworthy/al-khaser/blob/master/al-khaser/AntiDebug/TrapFlag.cpp
    examples:
      - al-khaser_x86.exe_:0x431680
      - al-khaser_x64.exe_:0x140030CB0
  features:
    - and:
      - or:
        - description: read/write EFLAGS register
        - and:
          - mnemonic: pushf
          - mnemonic: popf
        - and:
          - mnemonic: pushfd
          - mnemonic: popfd
        - and:
          - mnemonic: pushfq
          - mnemonic: popfq
      - or:
        - description: set trap flag
        - and:
          - mnemonic: or
          - number: 0x100
        - and:
          - mnemonic: bts
          - number: 0x8

Associated Techniques