process where host.os.type == "windows" and
  event.type == "start" and
  (
    /* Slack */
    (process.name : "slack.exe" and not
      (process.code_signature.subject_name in (
        "Slack Technologies, Inc.",
        "Slack Technologies, LLC"
       ) and process.code_signature.trusted == true)
    ) or

    /* WebEx */
    (process.name : "WebexHost.exe" and not
      (process.code_signature.subject_name in ("Cisco WebEx LLC", "Cisco Systems, Inc.") and process.code_signature.trusted == true)
    ) or

    /* Teams */
    (process.name : "Teams.exe" and not
      (process.code_signature.subject_name == "Microsoft Corporation" and process.code_signature.trusted == true)
    ) or

    /* Discord */
    (process.name : "Discord.exe" and not
      (process.code_signature.subject_name == "Discord Inc." and process.code_signature.trusted == true)
    ) or

    /* RocketChat */
    (process.name : "Rocket.Chat.exe" and not
      (process.code_signature.subject_name == "Rocket.Chat Technologies Corp." and process.code_signature.trusted == true)
    ) or

    /* Mattermost */
    (process.name : "Mattermost.exe" and not
      (process.code_signature.subject_name == "Mattermost, Inc." and process.code_signature.trusted == true)
    ) or

    /* WhatsApp */
    (process.name : "WhatsApp.exe" and not
      (process.code_signature.subject_name in (
        "WhatsApp LLC",
        "WhatsApp, Inc",
        "24803D75-212C-471A-BC57-9EF86AB91435"
       ) and process.code_signature.trusted == true)
    ) or

    /* Zoom */
    (process.name : "Zoom.exe" and not
      (process.code_signature.subject_name == "Zoom Video Communications, Inc." and process.code_signature.trusted == true)
    ) or

    /* Outlook */
    (process.name : "outlook.exe" and not
      (process.code_signature.subject_name == "Microsoft Corporation" and process.code_signature.trusted == true)
    ) or

    /* Thunderbird */
    (process.name : "thunderbird.exe" and not
      (process.code_signature.subject_name == "Mozilla Corporation" and process.code_signature.trusted == true)
    )
  )