Medium Severity

Attachment: XLS with legal confidentiality disclaimer

Labels

Malware/Ransomware

BEC/Fraud

Description

Detects inbound emails with XLS attachments containing a specific legal confidentiality disclaimer string commonly found in corporate email signatures. This pattern may indicate a malicious spreadsheet crafted to appear as a legitimate forwarded business communication, lending false credibility to the attachment.

References

No references.

Sublime Security

Created Sep 10th, 2026 • Last updated Sep 10th, 2026

Feed Source

Sublime Core Feed

Source

GitHub

type.inbound
and any(attachments,
        (.file_extension in~ ("xls"))
        and any(file.explode(.),
                any(.scan.strings.strings,
                    strings.contains(.,
                                     'The information contained in this transmission and its attachments (an "e-communication") are intended solely for the use of the intended recipient(s) and may contain information that is privileged, confidential, proprietary and/or otherwise protected by work product immunity or other legal rules.'
                    )
                )
        )
)

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