get remote cert context via SChannel

rule:
  meta:
    name: get remote cert context via SChannel
    namespace: data-manipulation/encryption
    authors:
      - matthew.williams@mandiant.com
    scopes:
      static: basic block
      dynamic: call
    att&ck:
      - Defense Evasion::Obfuscated Files or Information [T1027]
    references:
      - https://docs.microsoft.com/en-us/windows/win32/secauthn/querycontextattributes--schannel
  features:
    - and:
      - api: secur32.QueryContextAttributes
      - number: 0x53 = SECPKG_ATTR_REMOTE_CERT_CONTEXT