sublimemediumRule

Link: Mixed case HTTPS protocol

Detects messages containing links with mixed case 'hTTPs' protocol, a technique used to evade detection filters.

MITRE ATT&CK

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

defense-evasion

Detection Query

type.inbound
and length(body.links) > 0 
and any(body.links, strings.contains(.href_url.url, 'hTTPs://'))

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Link: Mixed case HTTPS protocol"
description: "Detects messages containing links with mixed case 'hTTPs' protocol, a technique used to evade detection filters."
type: "rule"
severity: "medium"
source: |
  type.inbound
  and length(body.links) > 0 
  and any(body.links, strings.contains(.href_url.url, 'hTTPs://'))

attack_types:
  - "Credential Phishing"
  - "Malware/Ransomware"
tactics_and_techniques:
  - "Evasion"
detection_methods:
  - "Content analysis"
  - "URL analysis"
id: "f3424a81-3843-5a3e-8fc8-126cf7037cfa"