Sublime Security high experimental mql
Brand impersonation: DocuSign with embedded QR code
This rule detects unsolicited messages with short bodies containing a DocuSign logo, QR code language and an embedded QR code.
Detection Logic
type.inbound
and length(body.current_thread.text) < 1000
and length(attachments) == 0
and regex.icontains(body.current_thread.text, '\bQ(\.)?R(\.)?\b')
and regex.icontains(body.current_thread.text, "scan
| mobile
| camera")
and any(ml.logo_detect(file.message_screenshot()).brands,
strings.starts_with(.name, "DocuSign")
)
//
// This rule makes use of a beta feature and is subject to change without notice
// using the beta feature in custom rules is not suggested until it has been formally released
//
and any(beta.scan_qr(file.message_screenshot()).items,
.type is not null and regex.contains(.data, '\.')
)
// negate highly trusted sender domains unless they fail DMARC authentication
and (
(
sender.email.domain.root_domain in $high_trust_sender_root_domains
and not headers.auth_summary.dmarc.pass
)
or sender.email.domain.root_domain not in $high_trust_sender_root_domains
) Field Validations
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