sublimemediumRule

Attachment: PDF including a Microsoft lure with specific signature

Detects inbound messages containing PDF attachments that match a YARA rule associated with Microsoft-themed lure content.

MITRE ATT&CK

T1566 T1566.001 T1566.002 T1598 T1598.003

initial-access

Detection Query

type.inbound
and any(filter(attachments, .file_type == "pdf"),
        any(file.explode(.),
            any(.scan.yara.matches, .name == "pdf_msft_lure_signature")
        )
)

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Attachment: PDF including a Microsoft lure with specific signature"
description: "Detects inbound messages containing PDF attachments that match a YARA rule associated with Microsoft-themed lure content."
type: "rule"
severity: "medium"
source: |
  type.inbound
  and any(filter(attachments, .file_type == "pdf"),
          any(file.explode(.),
              any(.scan.yara.matches, .name == "pdf_msft_lure_signature")
          )
  )
attack_types:
  - "Credential Phishing"
tactics_and_techniques:
  - "PDF"
  - "Impersonation: Brand"
  - "Social engineering"
detection_methods:
  - "YARA"
  - "File analysis"
id: "34810dba-296e-539f-b85e-0074a30afcc7"