From 27716f147ba3b333d309320339419b94c97567f8 Mon Sep 17 00:00:00 2001
From: Aiden Mitchell <me@aidenmitchell.ca>
Date: Thu, 7 Dec 2023 10:31:41 -0800
Subject: [PATCH 1/2] Create impersonation_dashlane.yml

---
 detection-rules/impersonation_dashlane.yml | 40 ++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 detection-rules/impersonation_dashlane.yml

diff --git a/detection-rules/impersonation_dashlane.yml b/detection-rules/impersonation_dashlane.yml
new file mode 100644
index 00000000000..df43f400dba
--- /dev/null
+++ b/detection-rules/impersonation_dashlane.yml
@@ -0,0 +1,40 @@
+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"

From 2b8e242d7b8d15e5c3150a38ac9725891a6f9030 Mon Sep 17 00:00:00 2001
From: ID Generator <hello@sublimesecurity.com>
Date: Thu, 7 Dec 2023 18:33:06 +0000
Subject: [PATCH 2/2] Auto add rule ID

---
 detection-rules/impersonation_dashlane.yml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/detection-rules/impersonation_dashlane.yml b/detection-rules/impersonation_dashlane.yml
index df43f400dba..7c217b54031 100644
--- a/detection-rules/impersonation_dashlane.yml
+++ b/detection-rules/impersonation_dashlane.yml
@@ -38,3 +38,4 @@ tactics_and_techniques:
 detection_methods:
   - "Header analysis"
   - "Sender analysis"
+id: "9e400937-4e7e-53fe-ad34-8393ab01890e"