enumerate process modules

rule:
  meta:
    name: enumerate process modules
    namespace: host-interaction/process/modules/list
    authors:
      - michael.hunhoff@mandiant.com
      - anushka.virgaonkar@mandiant.com
    scopes:
      static: function
      dynamic: thread
    att&ck:
      - Discovery::Process Discovery [T1057]
    examples:
      - 6F99A2C8944CB02FF28C6F9CED59B161:0x419FF8
      - 9B2FD471274C41626B75DDBB5C897877:0x100046B0
  features:
    - or:
      - and:
        - optional:
          - or:
            - api: kernel32.OpenProcess
            - api: kernel32.CloseHandle
        - or:
          - api: kernel32.K32EnumProcessModules
          - api: kernel32.K32EnumProcessModulesEx
          - api: kernel32.K32EnumProcesses
          # depending on OS version in kernel32 or psapi
          - api: EnumProcessModules
          - api: EnumProcessModulesEx
          - api: EnumProcesses
      - and:
        - api: kernel32.Module32First
        - api: kernel32.Module32Next
        - optional:
          - basic block:
            - and:
              - or:
                - number: 0x8 = TH32CS_SNAPMODULE
                - number: 0x10 = TH32CS_SNAPMODULE32
                - number: 0x18 = TH32CS_SNAPMODULE | TH32CS_SNAPMODULE32
              - api: kernel32.CreateToolhelp32Snapshot
          - call:
            - and:
              - or:
                - number: 0x8 = TH32CS_SNAPMODULE
                - number: 0x10 = TH32CS_SNAPMODULE32
                - number: 0x18 = TH32CS_SNAPMODULE | TH32CS_SNAPMODULE32
              - api: kernel32.CreateToolhelp32Snapshot
      - and:
        - property/read: System.Diagnostics.Process::Modules
        - property/read: System.Diagnostics.ProcessModuleCollection::Item