get number of processors

rule:
  meta:
    name: get number of processors
    namespace: host-interaction/hardware/cpu
    authors:
      - michael.hunhoff@mandiant.com
      - anushka.virgaonkar@mandiant.com
    scopes:
      static: function
      dynamic: unsupported  # requires property features
    att&ck:
      - Discovery::System Information Discovery [T1082]
    references:
      - https://github.com/LordNoteworthy/al-khaser/blob/bed03d2f849d9060c68f8d5905bd204d0cb3f593/al-khaser/AntiVM/Generic.cpp#L361
    examples:
      - al-khaser_x86.exe_:0x432CB0
  features:
    - or:
      - and:
        - match: PEB access
        - or:
          - and:
            - arch: i386
            - number: 0x64 = PEB->NumberOfProcessors
          - and:
            - arch: amd64
            - number: 0xB8 = PEB->NumberOfProcessors
      - property/read: System.Environment::ProcessorCount