sublimehighRule

Link: Breely link masquerading as PDF

Detects messages containing a single Breely link that displays as a PDF file. Typically, redirects to a different destination for malicious purposes.

MITRE ATT&CK

T1566.002 T1534 T1656 T1566 T1566.001 T1598

initial-access

Detection Query

type.inbound
and length(filter(body.links, .href_url.domain.root_domain == "breely.com")) == 1
and any(body.links,
        .href_url.domain.root_domain == "breely.com"
        and strings.icontains(.display_text, ".pdf")
)

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Link: Breely link masquerading as PDF"
description: "Detects messages containing a single Breely link that displays as a PDF file. Typically, redirects to a different destination for malicious purposes."
type: "rule"
severity: "high"
source: |
  type.inbound
  and length(filter(body.links, .href_url.domain.root_domain == "breely.com")) == 1
  and any(body.links,
          .href_url.domain.root_domain == "breely.com"
          and strings.icontains(.display_text, ".pdf")
  )

attack_types:
  - "BEC/Fraud"
  - "Credential Phishing"
tactics_and_techniques:
  - "Free subdomain host"
  - "Social engineering"
detection_methods:
  - "Content analysis"
  - "URL analysis"
id: "4a498c21-2f8a-5b54-84f5-c3c4ad3ee8e9"