sublimemediumRule

Attachment: ZIP containing Office binary with embedded DLL

Detects inbound messages with a ZIP attachment that contains an office binary and an unknown DLL.

MITRE ATT&CK

defense-evasion

Detection Query

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

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Attachment: ZIP containing Office binary with embedded DLL"
description: "Detects inbound messages with a ZIP attachment that contains an office binary and an unknown DLL."
type: "rule"
severity: "medium"
source: |
  type.inbound
  and any(filter(attachments, .file_type == "zip"),
          any(file.explode(.),
              any(.scan.yara.matches, .name == "zip_office_bin_dll")
          )
  )
attack_types:
  - "Malware/Ransomware"
tactics_and_techniques:
  - "Evasion"
detection_methods:
  - "Archive analysis"
  - "File analysis"
  - "YARA"
id: "23ec29d1-e1ca-5eaf-a03d-8d07dc395249"