From 1272c76ae7774430412a4adb7dbacbf1779ff92c Mon Sep 17 00:00:00 2001
From: Austin Songer <austin@songer.pro>
Date: Thu, 2 Sep 2021 20:31:27 -0500
Subject: [PATCH] Create azure_network_firewall_policy_modified_or_deleted.yml

---
 ...rk_firewall_policy_modified_or_deleted.yml | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 rules/cloud/azure/azure_network_firewall_policy_modified_or_deleted.yml

diff --git a/rules/cloud/azure/azure_network_firewall_policy_modified_or_deleted.yml b/rules/cloud/azure/azure_network_firewall_policy_modified_or_deleted.yml
new file mode 100644
index 000000000..b087d550f
--- /dev/null
+++ b/rules/cloud/azure/azure_network_firewall_policy_modified_or_deleted.yml
@@ -0,0 +1,24 @@
+title: Azure Network Firewall Policy Modified or Deleted
+id: 83c17918-746e-4bd9-920b-8e098bf88c23
+description: Identifies when a Firewall Policy is Modified or Deleted.
+author: Austin Songer @austinsonger
+status: experimental
+date: 2021/09/02
+references:
+    - https://docs.microsoft.com/en-us/azure/role-based-access-control/resource-provider-operations
+logsource:
+  service: azure.activitylogs
+detection:
+    selection:
+        properties.message: 
+            - MICROSOFT.NETWORK/FIREWALLPOLICIES/WRITE
+            - MICROSOFT.NETWORK/FIREWALLPOLICIES/JOIN/ACTION
+            - MICROSOFT.NETWORK/FIREWALLPOLICIES/CERTIFICATES/ACTION
+            - MICROSOFT.NETWORK/FIREWALLPOLICIES/DELETE
+    condition: selection
+level: medium
+tags:
+    - attack.impact
+falsepositives:
+ - Firewall Policy being modified or deleted may be performed by a system administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment. 
+ - Firewall Policy modified or deleted from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule.