From 00513ff2c515ae0bed40a7ac4306c6a169e841df Mon Sep 17 00:00:00 2001
From: Austin Songer <a.songer@protonmail.com>
Date: Thu, 30 Sep 2021 18:47:15 -0500
Subject: [PATCH] Create macos_suspicious_macos_firmware_activity.yml

---
 ...cos_suspicious_macos_firmware_activity.yml | 27 +++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 rules/linux/macos_suspicious_macos_firmware_activity.yml

diff --git a/rules/linux/macos_suspicious_macos_firmware_activity.yml b/rules/linux/macos_suspicious_macos_firmware_activity.yml
new file mode 100644
index 000000000..cc89eebfe
--- /dev/null
+++ b/rules/linux/macos_suspicious_macos_firmware_activity.yml
@@ -0,0 +1,27 @@
+title: Suspicious MacOS Firmware Activity
+id: 7ed2c9f7-c59d-4c82-a7e2-f859aa676099
+status: experimental
+description: Detects when a user manipulates with Firmward Password on MacOS. NOTE - this command has been disabled on silicon-based apple computers.
+author: Austin Songer @austinsonger
+date: 2021/09/30
+references:
+    - https://github.com/usnistgov/macos_security/blob/932a51f3e819dd3e02ebfcf3ef433cfffafbe28b/rules/os/os_firmware_password_require.yaml
+    - https://www.manpagez.com/man/8/firmwarepasswd/
+    - https://support.apple.com/guide/security/firmware-password-protection-sec28382c9ca/web
+logsource:
+    category: process_creation
+    product: macos
+detection:
+    selection1:
+        Image: '/usr/sbin/firmwarepasswd'
+        CommandLine|contains:
+            - 'setpasswd'
+            - 'full'
+            - 'delete'
+            - 'check'
+    condition: selection1
+falsepositives:
+    - Legitimate administration activities
+level: medium
+tags:
+    - attack.impact