• Sublime Core Feed

Description

A fraudulent invoice/receipt found in the body of the message sent by leveraging Payoneer's invoicing service. Callback Phishing is an attempt by an attacker to solicit the victim (recipient) to call a phone number. The resulting interaction could lead to a multitude of attacks ranging from Financial theft, Remote Access Trojan (RAT) Installation or Ransomware Deployment.

References

No references.

Sublime Security
Created Nov 5th, 2024 • Last updated Sep 5th, 2025
Source
type.inbound
and length(attachments) == 0
and sender.email.domain.root_domain in ("payoneer.com")

and (
  (
    // icontains a phone number
    (
      regex.icontains(strings.replace_confusables(body.current_thread.text),
                      '.*\+?([ilo0-9]{1}.)?\(?[ilo0-9]{3}?\)?.[ilo0-9]{3}.?[ilo0-9]{4}.*\n'
      )
      or regex.icontains(strings.replace_confusables(body.current_thread.text),
                         '.*\+[ilo0-9]{1,3}[ilo0-9]{10}.*\n'
      )
      or // +12028001238
     regex.icontains(strings.replace_confusables(body.current_thread.text),
                 '.*[ilo0-9]{3}\.[ilo0-9]{3}\.[ilo0-9]{4}.*\n'
      )
      or // 202-800-1238
     regex.icontains(strings.replace_confusables(body.current_thread.text),
                 '.*[ilo0-9]{3}-[ilo0-9]{3}-[ilo0-9]{4}.*\n'
      )
      or // (202) 800-1238
     regex.icontains(strings.replace_confusables(body.current_thread.text),
                 '.*\([ilo0-9]{3}\)[\s-]+[ilo0-9]{3}[\s-]+[ilo0-9]{4}.*\n'
      )
      or // (202)-800-1238
     regex.icontains(strings.replace_confusables(body.current_thread.text),
                 '.*\([ilo0-9]{3}\)-[ilo0-9]{3}-[ilo0-9]{4}.*\n'
      )
      or ( // 8123456789
        regex.icontains(strings.replace_confusables(body.current_thread.text),
                        '.*8[ilo0-9]{9}.*\n'
        )
        and regex.icontains(strings.replace_confusables(body.current_thread.text
                            ),
                            '\+[1l]'
        )
      )
    )
    and (
      (
        // list of keywords taken from
        // https://github.com/sublime-security/sublime-rules/blob/main/detection-rules/paypal_invoice_abuse.yml
        4 of (
          strings.ilike(body.html.inner_text, '*you did not*'),
          strings.ilike(body.html.inner_text, '*is not for*'),
          strings.ilike(body.html.inner_text, '*done by you*'),
          regex.icontains(body.html.inner_text, "didn\'t ma[kd]e this"),
          strings.ilike(body.html.inner_text, "*Fruad Alert*"),
          strings.ilike(body.html.inner_text, "*Fraud Alert*"),
          strings.ilike(body.html.inner_text, '*using your PayPal*'),
          strings.ilike(body.html.inner_text, '*subscription*'),
          strings.ilike(body.html.inner_text, '*antivirus*'),
          strings.ilike(body.html.inner_text, '*order*'),
          strings.ilike(body.html.inner_text, '*support*'),
          strings.ilike(body.html.inner_text, '*receipt*'),
          strings.ilike(body.html.inner_text, '*invoice*'),
          strings.ilike(body.html.inner_text, '*Purchase*'),
          strings.ilike(body.html.inner_text, '*transaction*'),
          strings.ilike(body.html.inner_text, '*Market*Value*'),
          strings.ilike(body.html.inner_text, '*BTC*'),
          strings.ilike(body.html.inner_text, '*call*'),
          strings.ilike(body.html.inner_text, '*get in touch with our*'),
          strings.ilike(body.html.inner_text, '*quickly inform*'),
          strings.ilike(body.html.inner_text, '*quickly reach *'),
          strings.ilike(body.html.inner_text, '*detected unusual transactions*'),
          strings.ilike(body.html.inner_text, '*cancel*'),
          strings.ilike(body.html.inner_text, '*renew*'),
          strings.ilike(body.html.inner_text, '*refund*'),
          strings.ilike(body.html.inner_text, '*+1*'),
          regex.icontains(body.html.inner_text, 'help.{0,3}desk'),
        )
      )
    )
  )
  or (
    // Unicode confusables words obfuscated in note
    regex.icontains(body.html.inner_text,
                    '\+𝟭|𝗽𝗮𝘆𝗺𝗲𝗻𝘁|𝗛𝗲𝗹𝗽 𝗗𝗲𝘀𝗸|𝗿𝗲𝗳𝘂𝗻𝗱|𝗮𝗻𝘁𝗶𝘃𝗶𝗿𝘂𝘀|𝗰𝗮𝗹𝗹|𝗰𝗮𝗻𝗰𝗲𝗹'
    )
  )
  or strings.ilike(body.html.inner_text, '*kindly*')
)
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