Callback phishing via Zoho service abuse

type.inbound

// Legitimate Zoho sending infratructure
and (
  sender.email.domain.root_domain in ('zohoinvoice.com')
  // check for SPF or DMARC passed
  and (headers.auth_summary.spf.pass or headers.auth_summary.dmarc.pass)
)
and (
  // Callback Phishing in body (brand names required)
  (
    length(attachments) == 0

    // brand names are required.
    and regex.icontains(body.current_thread.text,
                        (
                          "mcafee|norton|geek.{0,5}squad|paypal|ebay|symantec|best buy|lifelock"
                        )
    )
    and 3 of (
      strings.ilike(body.current_thread.text, '*purchase*'),
      strings.ilike(body.current_thread.text, '*payment*'),
      strings.ilike(body.current_thread.text, '*transaction*'),
      strings.ilike(body.current_thread.text, '*subscription*'),
      strings.ilike(body.current_thread.text, '*antivirus*'),
      strings.ilike(body.current_thread.text, '*order*'),
      strings.ilike(body.current_thread.text, '*support*'),
      strings.ilike(body.current_thread.text, '*help line*'),
      strings.ilike(body.current_thread.text, '*receipt*'),
      strings.ilike(body.current_thread.text, '*invoice*'),
      strings.ilike(body.current_thread.text, '*call*'),
      strings.ilike(body.current_thread.text, '*cancel*'),
      strings.ilike(body.current_thread.text, '*renew*'),
      strings.ilike(body.current_thread.text, '*refund*')
    )
    // phone number regex
    and any([body.current_thread.text, subject.subject],
            regex.icontains(., '\b\+?(\d{1}.)?\(?\d{3}?\)?.\d{3}.?\d{4}\b')
    )
  )
  // all attachments are PDFs with callback phishing indicators Brands Required
  or (
    length(attachments) < 3
    and all(attachments, .file_extension == "pdf")
    // the attachment is a pdf with 1 page, and at least 60 ocr chars
    and any(attachments,
            (
              .file_extension == "pdf"
              and any(file.explode(.), .scan.exiftool.page_count < 3)
              and any(file.explode(.), length(.scan.ocr.raw) > 60)

              // 4 of the following strings are found        
              and (
                any(file.explode(.),
                    4 of (
                      strings.icontains(.scan.ocr.raw, "purchase"),
                      strings.icontains(.scan.ocr.raw, "payment"),
                      strings.icontains(.scan.ocr.raw, "transaction"),
                      strings.icontains(.scan.ocr.raw, "subscription"),
                      strings.icontains(.scan.ocr.raw, "antivirus"),
                      strings.icontains(.scan.ocr.raw, "order"),
                      strings.icontains(.scan.ocr.raw, "support"),
                      strings.icontains(.scan.ocr.raw, "help line"),
                      strings.icontains(.scan.ocr.raw, "receipt"),
                      strings.icontains(.scan.ocr.raw, "invoice"),
                      strings.icontains(.scan.ocr.raw, "call"),
                      strings.icontains(.scan.ocr.raw, "helpdesk"),
                      strings.icontains(.scan.ocr.raw, "cancel"),
                      strings.icontains(.scan.ocr.raw, "renew"),
                      strings.icontains(.scan.ocr.raw, "refund"),
                      strings.icontains(.scan.ocr.raw, "amount"),
                      strings.icontains(.scan.ocr.raw, "crypto"),
                      strings.icontains(.scan.ocr.raw, "wallet address"),
                      regex.icontains(.scan.ocr.raw, '\$\d{3}\.\d{2}\b'),
                      regex.icontains(.scan.ocr.raw,
                                      '(\+\d|1.(\()?\d{3}(\))?\D\d{3}\D\d{4})'
                      ),
                      regex.icontains(.scan.ocr.raw,
                                      '\+?(\d{1,2})?\s?\(?\d{3}\)?[\s\.\-⋅]{0,5}\d{3}[\s\.\-⋅]{0,5}\d{4}'
                      )
                    )

                    // 1 of the following strings is found, representing common Callback brands          
                    and (
                      1 of (
                        strings.icontains(.scan.ocr.raw, "geek squad"),
                        strings.icontains(.scan.ocr.raw, "lifelock"),
                        strings.icontains(.scan.ocr.raw, "best buy"),
                        strings.icontains(.scan.ocr.raw, "mcafee"),
                        strings.icontains(.scan.ocr.raw, "norton"),
                        strings.icontains(.scan.ocr.raw, "ebay"),
                        strings.icontains(.scan.ocr.raw, "paypal"),
                      )
                      // add additional logic for common language for paypal, which is a valid payment method
                      and not regex.icontains(.scan.ocr.raw, "paypal[^\n]+accepted")
                      and not regex.icontains(.scan.ocr.raw, "payment.{0,30}(via|by) paypal")
                      and not regex.icontains(.scan.ocr.raw, '\d{2,4} norton')  // an address, example: 1234 Norton Road
                    )
                )
                or any(ml.logo_detect(.).brands,
                       .name in ("PayPal", "Norton", "GeekSquad", "Ebay")
                )
              )
            )
    )
  )
)