Medium Severity

Service abuse: Soundestlink.com Microsoft impersonation

Description

Detects links or extracted domains hosted on soundestlink.com where the subdomain contains Microsoft-related keywords such as 'microsoft', 'teams', 'login', 'office', '365', or 'outlook'. This pattern indicates abuse of a legitimate link redirection/tracking service to disguise malicious URLs as Microsoft login or authentication pages, a common technique used to harvest credentials.

References

No references.

Sublime Security
Created Aug 17th, 2026 • Last updated Aug 17th, 2026
Source
type.inbound
and (
  // parsed urls
  any(body.links,
      (
        .href_url.domain.root_domain == "soundestlink.com"
        and regex.icontains(.href_url.domain.subdomain,
                            '(?:microsoft|teams|login|office|365|outlook)'
        )
      )
      // handle mimecast
      or (
        .href_url.domain.root_domain in ("mimecastprotect.com", "mimecast.com")
        and any(.href_url.query_params_decoded['domain'],
                strings.parse_domain(.).root_domain == "soundestlink.com"
                and regex.icontains(strings.parse_domain(.).subdomain,
                                    '(?:microsoft|teams|login|office|365|outlook)'
                )
        )
      )
  )
  // unparsed and extracted
  or (
    strings.icontains(body.html.display_text, 'soundestlink.com')
    and any(regex.extract(body.html.display_text,
                          '(?P<domain>[a-z0-9.\-]+\.soundestlink\.com)'
            ),
            regex.icontains(strings.parse_domain(.named_groups["domain"]).subdomain,
                            '(?:microsoft|teams|login|office|365|outlook)'
            )
    )
  )
)
MQL Rule Console
DocsLearning Labs

Playground

Test against your own EMLs or sample data.

Share

Post about this on your socials.

Get Started. Today.

Managed or self-managed. No MX changes.

Deploy and integrate a free Sublime instance in minutes.
Get Started