Attachment: ZIP containing Office binary with embedded DLL

calendar Aug 24, 2026  ยท
Share on: linkedin copy

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

Sublime rule (View on GitHub)

 1name: "Attachment: ZIP containing Office binary with embedded DLL"
 2description: "Detects inbound messages with a ZIP attachment that contains an office binary and an unknown DLL."
 3type: "rule"
 4severity: "medium"
 5source: |
 6  type.inbound
 7  and any(filter(attachments, .file_type == "zip"),
 8          any(file.explode(.),
 9              any(.scan.yara.matches, .name == "zip_office_bin_dll")
10          )
11  )  
12attack_types:
13  - "Malware/Ransomware"
14tactics_and_techniques:
15  - "Evasion"
16detection_methods:
17  - "Archive analysis"
18  - "File analysis"
19  - "YARA"
20id: "23ec29d1-e1ca-5eaf-a03d-8d07dc395249"
to-top