sublimehighRule

Link: HTML file with suspicious binary fragment ending pattern

Detects links to HTML files containing fragments with a suspicious pattern of alphanumeric characters followed by a 5-digit binary sequence, commonly used in malicious URL structures.

MITRE ATT&CK

T1566 T1566.001 T1566.002 T1598 T1036 T1027

defense-evasion

Detection Query

type.inbound
and any(body.links,
        strings.ends_with(.href_url.path, '.html')
        and regex.contains(.href_url.fragment, '\-[a-z0-9]+[01]{5}$')
)

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Link: HTML file with suspicious binary fragment ending pattern"
description: "Detects links to HTML files containing fragments with a suspicious pattern of alphanumeric characters followed by a 5-digit binary sequence, commonly used in malicious URL structures."
type: "rule"
severity: "high"
source: |
  type.inbound
  and any(body.links,
          strings.ends_with(.href_url.path, '.html')
          and regex.contains(.href_url.fragment, '\-[a-z0-9]+[01]{5}$')
  )
attack_types:
  - "Credential Phishing"
tactics_and_techniques:
  - "Evasion"
detection_methods:
  - "URL analysis"
id: "dc5e3700-1f29-5fed-8378-38631e0ceea1"