Low Severity

Service abuse: Zoom Clips with suspicious reply-to address or links

Description

Detects legitimate-looking Zoom 'Clips shared' notifications sent from Zoom's genuine no-reply infrastructure, where the underlying reply-to address or embedded links show signs of abuse. This includes reply-to domains that very recently created, links pointing to scheduling services like Cal.com, Calendly, or Vasta, or unsolicited reply-to senders — all indicating the legitimate clip-sharing feature is being leveraged to route victims to attacker-controlled contact points.

References

No references.

Sublime Security
Created Jul 17th, 2026 • Last updated Sep 1st, 2026
Source
type.inbound
// Legitimate zoom sending infrastructure
and sender.email.email == "no-reply@zoom.us"
// sharing a clip
and (
  // as determiend by the subject
  strings.starts_with(subject.base, 'Clips')
  // or by a link
  or any(body.links,
         .href_url.domain.root_domain == "zoom.us"
         and strings.istarts_with(.href_url.path, '/clips/share')
  )
)
and (
  // reply-to domain is not registered
  network.whois(headers.reply_to[0].email.domain).found == false
  // recently registered
  or network.whois(headers.reply_to[0].email.domain).days_old <= 90
  // links it cal.com
  or any(body.links,
         .href_url.domain.root_domain in ('cal.com', 'calendly.com', 'vasta.me')
         // the link domain is newer than 90 days
         or network.whois(.href_url.domain).days_old < 90
  )

  // the reply to address is not soliticed
  //
  // This rule makes use of a beta feature and is subject to change without notice
  // using the beta feature in custom rules is not suggested until it has been formally released
  //
  or beta.profile.by_reply_to().solicited == false
)
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