sublimemediumRule

Headers: iOS/iPadOS mailer with invalid build number

Detects emails claiming to be sent from an iOS or iPadOS device that contain an invalid build number.

MITRE ATT&CK

T1566.002 T1534 T1656 T1566 T1566.001 T1598 T1204.002 T1486 T1036 T1027

defense-evasion

Detection Query

type.inbound
and regex.contains(headers.mailer, '(iPad|iPhone) Mail')
and not regex.contains(headers.mailer, '(iPad|iPhone) Mail \([0-9]{2}')

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Headers: iOS/iPadOS mailer with invalid build number"
description: |
  Detects emails claiming to be sent from an iOS or iPadOS device that contain an invalid build number.
type: "rule"
severity: "medium"
source: |
  type.inbound
  and regex.contains(headers.mailer, '(iPad|iPhone) Mail')
  and not regex.contains(headers.mailer, '(iPad|iPhone) Mail \([0-9]{2}')
attack_types:
  - "BEC/Fraud"
  - "Credential Phishing"
  - "Malware/Ransomware"
tactics_and_techniques:
  - "Evasion"
detection_methods:
  - "Header analysis"
id: "e0b74072-3210-5511-9ad9-2c945ab28abb"