Open redirect: qrxtech.com

name: "Open redirect: qrxtech.com"
description: |
  Message contains use of the qrxtech.com open redirect. This has been exploited in the wild.
type: "rule"
severity: "medium"
source: |
  type.inbound
  and any(body.links,
          .href_url.domain.root_domain == "qrxtech.com"
          and strings.iends_with(.href_url.path, 'XMLServer.aspx')
          and strings.icontains(.href_url.query_params, 'HREF=')
          and strings.icontains(.href_url.query_params, 'FUNC=')
          and not strings.icontains(.href_url.query_params,
                                    'HREF=(?:https?(?:%3a|:))?(?:%2f|\/){2}[^&]*qrxtech\.com(?:\&|\/|$)'
          )
  )
  // remove uses that originate from qrxtech.com
  and not any(headers.domains, .root_domain == "qrxtech.com")
  // 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
  )
attack_types:
  - "Credential Phishing"
  - "Malware/Ransomware"
tactics_and_techniques:
  - "Open redirect"
detection_methods:
  - "Sender analysis"
  - "URL analysis"
id: "b790552a-b115-50f8-b1ed-9fb3731824df"