Sublime Security high experimental mql

Attachment: HTML smuggling with RC4 decryption

Potential HTML smuggling. The RC4 algorithm is used within inline JavaScript to decrypt the payload on-the-fly.

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Detection Logic

type.inbound
and any(attachments,
        (
          .file_extension in~ ("html", "htm", "shtml", "dhtml")
          or .file_extension in~ $file_extensions_common_archives
          or .file_type == "html"
        )
        and any(file.explode(.),
                any(.scan.strings.strings,
                    strings.ilike(., "*?[(?[?]+?[?])%256]*")
                )
        )
)

Field Validations

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