Sync from PR#2057

Create open_redirect_next2.yml by @aidenmitchell
#2057
Source SHA b8449b6
Triggered by @aidenmitchell

detection-rules/open_redirect_next2.yml

@@ -0,0 +1,41 @@
+name: "Open redirect: next2.io"
+description: "Message contains use of a next.io redirect. This redirection has been abused by threat actors in the wild."
+type: "rule"
+severity: "medium"
+source: |
+  type.inbound
+  and any(body.links,
+          .href_url.domain.domain == "c.next2.io"
+          and .href_url.path =~ "/api/ads"
+          and strings.icontains(.href_url.query_params, 'fallback_url=')
+  )
+  and (
+    not profile.by_sender().solicited
+    or (
+      profile.by_sender().any_messages_malicious_or_spam
+      and not profile.by_sender().any_false_positives
+    )
+  )
+
+  // 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"
+tactics_and_techniques:
+  - "Evasion"
+  - "Open redirect"
+  - "Social engineering"
+detection_methods:
+  - "Content analysis"
+  - "Header analysis"
+  - "Sender analysis"
+  - "URL analysis"
+id: "5085c422-6fce-5ce9-836b-d4834117e810"
+testing_pr: 2057
+testing_sha: b8449b60a98bd91fe509fb035a4c28888b03f7c6