High Severity
Attachment: HTML smuggling with RC4 decryption
Description
Potential HTML smuggling. The RC4 algorithm is used within inline JavaScript to decrypt the payload on-the-fly.
References
Sublime Security
Created Aug 17th, 2023 • Last updated Aug 21st, 2023
Feed Source
Sublime Core Feed
Source
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]*"))
)
)
Playground
Test against your own EMLs or sample data.