check for software breakpoints

rule:
  meta:
    name: check for software breakpoints
    namespace: anti-analysis/anti-debugging/debugger-detection
    authors:
      - michael.hunhoff@mandiant.com
    scopes:
      static: function
      dynamic: unsupported  # requires mnemonic features
    mbc:
      - Anti-Behavioral Analysis::Debugger Detection::Software Breakpoints [B0001.025]
    references:
      - https://github.com/LordNoteworthy/al-khaser/blob/master/al-khaser/AntiDebug/SoftwareBreakpoints.cpp
      - https://anti-debug.checkpoint.com/techniques/assembly.html
    examples:
      - al-khaser_x86.exe_:0x431020
  features:
    - and:
      - or:
        - instruction:
          - mnemonic: cmp
          - number: 0xCC = INT3
        - and:
          - description: INT3 (long form)
          - instruction:
            - mnemonic: cmp
            - number: 0xCD = INT3 (long form byte 1)
          - instruction:
            - mnemonic: cmp
            - number: 0x03 = INT3 (long form byte 2)
      - match: contain loop