Medium Severity

Service abuse: Zoom with newly registered reply-to domain

Labels

Spam
Social engineering
Evasion
Sender analysis
Header analysis
Whois

Description

Detects messages from legitimate Zoom infrastructure (no-reply@zoom.us) that contain a reply-to address with a domain registered within the last 45 days, indicating potential abuse of Zoom's service for malicious purposes.

References

No references.

Sublime Security
Created May 4th, 2026 • Last updated May 4th, 2026
Feed Source
Sublime Core Feed
Source
GitHub
type.inbound
// Legitimate zoom sending infrastructure
and sender.email.email == "no-reply@zoom.us"
// newly registered reply-to domain
and network.whois(headers.reply_to[0].email.domain).days_old < 45
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