Sublime Security medium experimental mql

Impersonation: Recipient organization in sender display name with credential theft image

Sender display name contains the recipient's organization domain while the actual email address differs. Message includes a single image attachment with OCR-detected credential theft language referencing the recipient's domain, and has no body text.

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Detection Logic

type.inbound
and length(body.links) <= 1
and length(attachments) == 1
and strings.icontains(sender.display_name, recipients.to[0].email.domain.sld)
and length(recipients.to) == 1
and recipients.to[0].email.domain.root_domain in $org_domains
and 
// No body text
(
  length(body.current_thread.text) == 0 or body.current_thread.text is null
)
and all(attachments,
        .file_type in $file_types_images
        //
        // 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 strings.icontains(beta.ocr(.).text,
                              recipients.to[0].email.domain.sld
        )
        and any(ml.nlu_classifier(beta.ocr(.).text).intents,
                .name == "cred_theft" and .confidence == "high"
        )
)

Field Validations

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