Brand impersonation: Microsoft Teams

calendar Aug 21, 2023  ยท
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Impersonation of a Microsoft Teams message.

Sublime rule (View on GitHub)

 1name: "Brand impersonation: Microsoft Teams"
 2description: |
 3    Impersonation of a Microsoft Teams message.
 4type: "rule"
 5severity: "high"
 6source: |
 7  type.inbound
 8  and any(attachments,
 9          (.file_type in $file_types_images or .file_type == "pdf")
10          and any(file.explode(.),
11                  regex.icontains(.scan.ocr.raw, "trying to reach you.*microsoft teams")
12          )
13  )
14  and sender.email.domain.root_domain not in ("microsoft.com", "microsoftsupport.com", "office.com")  
15attack_types:
16  - "Credential Phishing"
17tactics_and_techniques:
18  - "Impersonation: Brand"
19  - "Social engineering"
20detection_methods:
21  - "Content analysis"
22  - "File analysis"
23  - "Optical Character Recognition"
24  - "Sender analysis"
25id: "9cd53055-8e1a-5a45-b78f-34a62f0793dd"
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