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High Severity

Attachment: DocuSign image lure with no DocuSign domains in links

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Description

Detects DocuSign phishing emails with no DocuSign links, a DocuSign logo attached, from a first-time sender.

References

No references.

Sublime Security
Created Aug 17th, 2023 • Last updated Nov 27th, 2023
Feed Source
Sublime Core Feed
Source
GitHub
type.inbound
and length(filter(attachments, .file_type not in $file_types_images)) == 0
and any(body.links, not strings.ilike(.href_url.domain.root_domain, "docusign.*"))
and any(attachments,
        (
          any(ml.logo_detect(.).brands, .name == "DocuSign" and .confidence in ("medium", "high"))
          or any(file.explode(.),
                 strings.ilike(.scan.ocr.raw, "*DocuSign*")
                 and any(ml.nlu_classifier(.scan.ocr.raw).intents,
                     .name == "cred_theft" and .confidence != "low"
                 )
          )
        )
        and any(file.explode(.),
                regex.icontains(.scan.ocr.raw,
                                "review document",
                                "[^d][^o][^c][^u]sign",
                                "important edocs",
                                "completed document"
                )
        )
)
and (
  not profile.by_sender().solicited
  or (
    profile.by_sender().any_messages_malicious_or_spam
    and not profile.by_sender().any_false_positives
  )
)
and not profile.by_sender().any_false_positives

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