Attachment: OLE external relationship containing file scheme link to executable filetype

type.inbound
and any(attachments,
        (
          .file_extension in~ $file_extensions_macros
          or .file_extension in~ $file_extensions_common_archives
          or (
            .file_extension is null
            and .file_type == "unknown"
            and .content_type == "application/octet-stream"
            and .size < 100000000
          )
        )
        and length(file.oletools(.).relationships) < 500
        and any(file.oletools(.).relationships,
                .target_url.scheme == "file"
                and regex.icontains(.target_url.path,
                                    '\.(action|ahk|apk|app|appimage|applescript|bat|bin|cab|cmd|command|cpl|dll|dmg|exe|gadget|hta|inf|ins|ipa|isu|jar|job|js|jse|lnk|msi|msp|paf|pif|ps1|rgs|run|scr|sct|sh|shb|vb|vbe|vbs)($|[^\w])'
                )
                // avoid flagging on internal/network drives mappings
                and not (
                  strings.starts_with(.target_url.scheme, "file")
                  and not regex.imatch(.target_url.path, '/?[a-z]:/')
                )
        )
)
and (
  not profile.by_sender().any_messages_benign
  or profile.by_sender().any_messages_malicious_or_spam
)