Create open_redirect_qrxtech.yml (#2328)

Co-authored-by: ID Generator <[email protected]>

detection-rules/open_redirect_qrxtech.yml

@@ -0,0 +1,35 @@
+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"