sublimemediumRule

Service abuse: Google Drive share from new reply-to domain

A Google Drive sharing notification containing a reply-to address from a recently registered domain (less than 30 days old). The reply-to domain does not match any organizational domains.

MITRE ATT&CK

T1566.002 T1534 T1656 T1566.003 T1598 T1566 T1566.001

initial-access

Detection Query

type.inbound
and sender.email.email in (
  'drive-shares-dm-noreply@google.com',
  'drive-shares-noreply@google.com',
)
and not any(headers.reply_to, .email.domain.domain in $org_domains)

// the message needs to have a reply-to address
and length(headers.reply_to) > 0

// new reply-to
and any(headers.reply_to, network.whois(.email.domain).days_old < 30)

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Tags

Attack surface reduction

Raw Content

name: "Service abuse: Google Drive share from new reply-to domain"
description: "A Google Drive sharing notification containing a reply-to address from a recently registered domain (less than 30 days old). The reply-to domain does not match any organizational domains."
type: "rule"
severity: "medium"
source: |
  type.inbound
  and sender.email.email in (
    'drive-shares-dm-noreply@google.com',
    'drive-shares-noreply@google.com',
  )
  and not any(headers.reply_to, .email.domain.domain in $org_domains)
  
  // the message needs to have a reply-to address
  and length(headers.reply_to) > 0
  
  // new reply-to
  and any(headers.reply_to, network.whois(.email.domain).days_old < 30)
tags:
 - "Attack surface reduction"
attack_types:
  - "BEC/Fraud"
  - "Callback Phishing"
  - "Credential Phishing"
tactics_and_techniques:
  - "Free email provider"
  - "Social engineering"
  - "Free file host"
detection_methods:
  - "Header analysis"
  - "Sender analysis"
  - "Whois"
id: "c1a2d367-ebdd-5557-926d-fe7b9ebfa324"