From bbe84ae69f6c745efb3d53951beb2968592b6d11 Mon Sep 17 00:00:00 2001
From: Aiden Mitchell <me@aidenmitchell.ca>
Date: Tue, 17 Oct 2023 13:06:13 -0700
Subject: [PATCH 1/3] New rule: impersonation_quickbooks.yml

---
 detection-rules/impersonation_quickbooks.yml | 33 ++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 detection-rules/impersonation_quickbooks.yml

diff --git a/detection-rules/impersonation_quickbooks.yml b/detection-rules/impersonation_quickbooks.yml
new file mode 100644
index 00000000000..f1fb01bf702
--- /dev/null
+++ b/detection-rules/impersonation_quickbooks.yml
@@ -0,0 +1,33 @@
+name: "Brand impersonation: Quickbooks"
+description: "Impersonation of the Quickbooks service from Intuit."
+type: "rule"
+severity: "medium"
+source: |
+  type.inbound
+  and (
+    (
+      strings.ilike(sender.display_name, '*quickbooks*')
+      or strings.ilevenshtein(sender.display_name, 'quickbooks') <= 1
+      or strings.ilike(sender.email.domain.domain, '*quickbooks*')
+    )
+    or strings.ilike(body.current_thread.text, "*invoice*")
+  )
+  and any(ml.logo_detect(beta.message_screenshot()).brands,
+          .name == "Quickbooks" and .confidence in ("medium", "high")
+  )
+  and sender.email.domain.root_domain not in~ ('intuit.com', 'turbotax.com', 'intuit.ca')
+  and (
+      not profile.by_sender().any_false_positives 
+      and not profile.by_sender().solicited
+  )
+attack_types:
+  - "Callback Phishing"
+  - "Credential Phishing"
+tactics_and_techniques:
+  - "Impersonation: Brand"
+  - "Social engineering"
+detection_methods:
+  - "Computer Vision"
+  - "Content analysis"
+  - "Header analysis"
+  - "Sender analysis"

From 21e1804ace0576c2bdd5f1da208caecf6365c664 Mon Sep 17 00:00:00 2001
From: ID Generator <hello@sublimesecurity.com>
Date: Tue, 17 Oct 2023 20:10:06 +0000
Subject: [PATCH 2/3] Auto add rule ID

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

diff --git a/detection-rules/impersonation_quickbooks.yml b/detection-rules/impersonation_quickbooks.yml
index f1fb01bf702..9e004f6837a 100644
--- a/detection-rules/impersonation_quickbooks.yml
+++ b/detection-rules/impersonation_quickbooks.yml
@@ -31,3 +31,4 @@ detection_methods:
   - "Content analysis"
   - "Header analysis"
   - "Sender analysis"
+id: "4fd791d1-a053-5c2d-80dd-c6dcdc112a62"

From d2f5a44dcf780f098038731ae6495d1531eff8c7 Mon Sep 17 00:00:00 2001
From: Aiden Mitchell <me@aidenmitchell.ca>
Date: Fri, 3 Nov 2023 12:40:43 -0700
Subject: [PATCH 3/3] Update impersonation_quickbooks.yml

---
 detection-rules/impersonation_quickbooks.yml | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/detection-rules/impersonation_quickbooks.yml b/detection-rules/impersonation_quickbooks.yml
index 9e004f6837a..af5b20fac49 100644
--- a/detection-rules/impersonation_quickbooks.yml
+++ b/detection-rules/impersonation_quickbooks.yml
@@ -20,6 +20,20 @@ source: |
       not profile.by_sender().any_false_positives 
       and not profile.by_sender().solicited
   )
+
+  // 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:
   - "Callback Phishing"
   - "Credential Phishing"