Open redirect: tkqlhce.com

name: "Open redirect: tkqlhce.com"
description: |
  Message contains use of the tkqlhce.com redirect. This has been exploited in the wild for phishing.
type: "rule"
severity: "medium"
source: |
  type.inbound
  and length(body.links) < 10
  and any(body.links,
          .href_url.domain.root_domain == "tkqlhce.com"
          and (
            (
              strings.icontains(.href_url.query_params, 'url=')
              and not regex.icontains(.href_url.query_params,
                                      'url=(?:https?(?:%3a|:))?(?:%2f|\/){2}[^&]*tkqlhce\.com(?:\&|\/|$|%2f)'
              )
            )
            or (
              strings.icontains(.href_url.path, '/links/')
              and strings.icontains(.href_url.path, '/type/dlg/')
              and regex.icontains(.href_url.path, 'https?://')
              and not regex.icontains(.href_url.path,
                                      '/links/[^/]+/type/dlg/(?:https?(?:%3a|:))?(?:%2f|\/){2}[^&]*tkqlhce\.com(?:\&|\/|$|%2f)'
              )
            )
          )
  )
  and not sender.email.domain.root_domain == "tkqlhce.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: "44eef073-9264-53af-8a23-b2188295e238"