Create brand_impersonation_salesforce.yml

detection-rules/brand_impersonation_salesforce.yml

@@ -0,0 +1,73 @@
+name: "Brand Impersonation: Salesforce"
+description: "Detects impersonation of Salesforce through display name, email domain, or domain similarity, excluding legitimate Salesforce communications, training-related emails with proper authentication, and internal domain notifications."
+type: "rule"
+severity: "medium"
+source: |
+  type.inbound
+  and (
+    regex.icontains(sender.display_name, 'salesforce')
+    or strings.ilike(sender.display_name, "*salesforce*")
+    or strings.ilevenshtein(sender.display_name, 'salesforce') <= 2
+    or strings.ilike(sender.email.domain.domain, '*salesforce*')
+  )
+  and not (
+    (
+      // legitimate domains
+      (
+        sender.email.domain.root_domain in (
+          "salesforce.com",
+          "salesforceventures.com",
+          "exacttarget.com",
+          "tangocard.com", // https://www.tangocard.com/salesforce-partnership
+          "elevatesalesforce.com", // unrelated but name in domain 
+          "salesforceben.com", // salesforce newsletter
+          "connectwithsal.com", // levenshtein 
+          "smartsheet.com", // used by salesforce
+          "hic-salesforce.com", // third party salesforce partner
+          "aspiresalesforceconsultancy.net", // third party salesforce partner
+          "kestoneglobal.biz", // third party 
+          "salesforceeurope.com", // outsourced salesforce staffing
+          "salesforcerecruiter.com", // outsourced salesforce staffing
+          "on24event.com", // events for salesforce
+          "cypress.courses" // trainign for salesforce
+        )
+        or sender.email.domain.domain in ("salesforce.rxsavingssolutions.com", "salesforce.jointcommission.org") // unrelated but legit domains
+      )
+      and headers.auth_summary.dmarc.pass
+    )
+    // email related to salesforce training being offered
+    or (
+      (
+        regex.icontains(body.current_thread.text, "salesforce (training|bootcamp|research)")
+        or regex.icontains(subject.subject, "salesforce (training|bootcamp|research)")
+      )
+      and headers.auth_summary.dmarc.pass
+   )
+  //  email from own domain with salesforce notification
+    or (
+      sender.email.domain.root_domain in $org_domains
+      and not headers.auth_summary.dmarc.pass
+    )
+  )
+  and not profile.by_sender().solicited
+  and not any(body.links, .href_url.domain.root_domain == "salesforce.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"
+tactics_and_techniques:
+  - "Impersonation: Brand"
+  - "Lookalike domain"
+  - "Social engineering"
+detection_methods:
+  - "Content analysis"
+  - "Header analysis"
+  - "Sender analysis"
+id: "736dfb87-1f99-5cdb-aefc-392257376f3d"