From 957f80ec4a061f45ab445a358bbc1873397c37f4 Mon Sep 17 00:00:00 2001
From: frack113 <62423083+frack113@users.noreply.github.com>
Date: Sun, 17 Jul 2022 19:46:19 +0200
Subject: [PATCH] Fax service persistance

---
 .../registry_set_fax_change_service_user.yml  | 24 +++++++++++++++++
 .../registry_set_fax_dll_persistance.yml      | 26 +++++++++++++++++++
 2 files changed, 50 insertions(+)
 create mode 100644 rules/windows/registry/registry_set/registry_set_fax_change_service_user.yml
 create mode 100644 rules/windows/registry/registry_set/registry_set_fax_dll_persistance.yml

diff --git a/rules/windows/registry/registry_set/registry_set_fax_change_service_user.yml b/rules/windows/registry/registry_set/registry_set_fax_change_service_user.yml
new file mode 100644
index 000000000..53c54121b
--- /dev/null
+++ b/rules/windows/registry/registry_set/registry_set_fax_change_service_user.yml
@@ -0,0 +1,24 @@
+title: Change User Account Associated with the FAX Service
+id: e3fdf743-f05b-4051-990a-b66919be1743
+description: Detect change of the user account associated with the FAX service to avoid the escalation problem.
+status: experimental
+references:
+    - https://twitter.com/dottor_morte/status/1544652325570191361
+    - https://raw.githubusercontent.com/RiccardoAncarani/talks/master/F-Secure/unorthodox-lateral-movement.pdf
+date: 2022/07/17
+author: frack113
+level: high
+logsource:
+    product: windows
+    category: registry_set
+detection:
+    selection:
+        TargetObject: HKLM\System\CurrentControlSet\Services\Fax\ObjectName
+    filter:
+        details|contains: NetworkService
+    condition: selection and not filter
+falsepositives:
+    - Unknown
+tags:
+    - attack.defense_evasion
+    - attack.t1112 
\ No newline at end of file
diff --git a/rules/windows/registry/registry_set/registry_set_fax_dll_persistance.yml b/rules/windows/registry/registry_set/registry_set_fax_dll_persistance.yml
new file mode 100644
index 000000000..23107e6d4
--- /dev/null
+++ b/rules/windows/registry/registry_set/registry_set_fax_dll_persistance.yml
@@ -0,0 +1,26 @@
+title: Change the Fax Dll
+id: 9e3357ba-09d4-4fbd-a7c5-ad6386314513
+description: Detect possible persistance using Fax DLL load when service restart
+status: experimental
+references:
+    - https://twitter.com/dottor_morte/status/1544652325570191361
+    - https://raw.githubusercontent.com/RiccardoAncarani/talks/master/F-Secure/unorthodox-lateral-movement.pdf
+date: 2022/07/17
+author: frack113
+level: high
+logsource:
+    product: windows
+    category: registry_set
+detection:
+    selection:
+        TargetObject|contains|all:
+            - '\Software\Microsoft\Fax\Device Providers\'
+            - '\ImageName'
+    filter:
+        details: '%systemroot%\system32\fxst30.dll' #Windows 10
+    condition: selection and not filter
+falsepositives:
+    - Unknown
+tags:
+    - attack.defense_evasion
+    - attack.t1112 
\ No newline at end of file