Medium Severity

Service abuse: Outlook Groups with Google Sites link and evasion tag

Labels

Credential Phishing
Evasion
Free subdomain host
Social engineering
Content analysis
Header analysis
URL analysis
Sender analysis

Description

Detects inbound messages sent via Outlook Groups (groups.outlook.com) that contain links to Google Sites, combined with a suspicious short alphanumeric tag appended to either the message body or subject line. This pattern is commonly used to evade detection while redirecting recipients to credential harvesting pages hosted on Google Sites.

References

No references.

Sublime Security
Created Jun 17th, 2026 • Last updated Jun 17th, 2026
Feed Source
Sublime Core Feed
Source
GitHub
type.inbound
and headers.return_path.domain.domain == "groups.outlook.com"
and any(body.current_thread.links,
        .href_url.domain.domain == "sites.google.com"
)
and (
  regex.icontains(body.current_thread.text, '\n[a-z0-9]{3}\s*$')
  or regex.icontains(subject.base, '\s{2,}[a-z0-9]{3}\s*$')
)
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