Medium Severity

Service abuse: Citrix ShareFile impersonation via Outlook plugin

Description

Detects inbound messages with Word document attachments containing references to sharefile.com and Outlook plugin system indicators, suggesting abuse of legitimate file sharing services to deliver malicious content.

References

No references.

Sublime Security
Created Jun 5th, 2026 • Last updated Jun 5th, 2026
Source
type.inbound
and any(attachments,
        .file_type in ("doc", "docx")
        and any(file.explode(.),
                strings.icontains(.scan.strings.raw, "sharefile.com")
                and strings.icontains(.scan.strings.raw,
                                      "src=system-email-outlookplugin-new"
                )
        )
)  
MQL Rule Console
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