• Sublime Core Feed
High Severity

Brand impersonation: Microsoft quarantine release notification in body

Labels

Credential Phishing
Impersonation: Brand
Social engineering
Computer Vision
Content analysis
File analysis
Sender analysis

Description

Message containing suspicious quarantine release language in the body, and a Microsoft logo attachment but did not come from Microsoft.

References

No references.

Sublime Security
Created May 10th, 2024 • Last updated Jul 16th, 2025
Feed Source
Sublime Core Feed
Source
GitHub
type.inbound
and length(filter(attachments, .file_type not in $file_types_images)) == 0
and any(attachments,
        any(file.explode(.),
            (
              // attachment is most likely only a logo 
              (
                length(.scan.ocr.raw) < 15 or .scan.ocr.raw is null
              )
              and any(ml.logo_detect(..).brands,
                      strings.starts_with(.name, "Microsoft")
              )
            )
        )
        and (
          3 of (
            strings.ilike(body.current_thread.text, "*review*"),
            strings.ilike(body.current_thread.text, "*release*"),
            strings.ilike(body.current_thread.text, "*quarantine*"),
            strings.ilike(body.current_thread.text, "*messages*"),
            strings.ilike(body.current_thread.text, "*blocked*"),
            strings.ilike(body.current_thread.text, "*notification*"),
            strings.ilike(body.current_thread.text, "*kindly*")
          )
        )
)
and sender.email.domain.root_domain not in (
  "bing.com",
  "microsoft.com",
  "microsoftonline.com",
  "microsoftsupport.com",
  "microsoft365.com",
  "office.com",
  "office365.com",
  "onedrive.com",
  "sharepointonline.com",
  "yammer.com",
)

// negate highly trusted sender domains unless they fail DMARC authentication
and (
  (
    sender.email.domain.root_domain in $high_trust_sender_root_domains
    and not headers.auth_summary.dmarc.pass
  )
  or sender.email.domain.root_domain not in $high_trust_sender_root_domains
)
and not profile.by_sender().solicited
and not profile.by_sender().any_messages_benign
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