send request in .NET

rule:
  meta:
    name: send request in .NET
    namespace: communication/http/client
    authors:
      - anushka.virgaonakr@mandiant.com
    scopes:
      static: function
      dynamic: span of calls
    att&ck:
      - Command and Control::Application Layer Protocol::Web Protocols [T1071.001]
    mbc:
      - Communication::HTTP Communication::Send Request [C0002.003]
  features:
    - and:
      - or:
        - api: System.Net.WebRequest::GetRequestStream
        - api: System.Net.WebRequest::GetRequestStreamAsync
        - and:
          - api: System.Net.WebRequest::BeginGetRequestStream
          - api: System.Net.WebRequest::EndGetRequestStream
      - api: System.IO.Stream::Write
      - api: System.IO.Stream::Close