Sync from PR#1108

Create impersonation_dashlane.yml by @aidenmitchell
#1108
Source SHA 4cb2819
Triggered by @morriscode

detection-rules/impersonation_dashlane.yml

@@ -0,0 +1,42 @@
+name: "Brand impersonation: Dashlane"
+description: "Impersonation of the password management software Dashlane."
+type: "rule"
+severity: "medium"
+source: |
+  type.inbound
+  and (
+    regex.icontains(sender.display_name, '\bDashlane\b')
+    or strings.ilike(sender.email.domain.domain, '*Dashlane*')
+  )
+  and sender.email.domain.root_domain not in~ ('dashlane.com')
+  and (
+    profile.by_sender().prevalence in ("new", "outlier")
+    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 (
+        any(distinct(headers.hops, .authentication_results.dmarc is not null),
+            strings.ilike(.authentication_results.dmarc, "*fail")
+        )
+      )
+    )
+    or sender.email.domain.root_domain not in $high_trust_sender_root_domains
+  )
+attack_types:
+  - "Credential Phishing"
+tactics_and_techniques:
+  - "Impersonation: Brand"
+  - "Social engineering"
+detection_methods:
+  - "Header analysis"
+  - "Sender analysis"
+id: "9e400937-4e7e-53fe-ad34-8393ab01890e"
+testing_pr: 1108
+testing_sha: 4cb2819dc9048f6869325d03f18277d4b59138f6