sublimemediumRule

Service abuse: Zoom with newly registered reply-to domain

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.

MITRE ATT&CK

T1566 T1598 T1036 T1027

initial-accessdefense-evasion

Detection Query

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

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Tags

Attack surface reduction

Raw Content

name: "Service abuse: Zoom with newly registered reply-to domain"
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."
type: "rule"
severity: "medium"
source: |
  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
tags:
  - "Attack surface reduction"
attack_types:
  - "Spam"
tactics_and_techniques:
  - "Social engineering"
  - "Evasion"
detection_methods:
  - "Sender analysis"
  - "Header analysis"
  - "Whois"
id: "93115dd9-5b26-5bc7-9f79-d6e5fae96fd9"