diff --git a/rules/windows/process_creation/proc_creation_win_susp_rundll32_spawn_explorer.yml b/rules/windows/process_creation/proc_creation_win_susp_rundll32_spawn_explorer.yml
index aabc317a5..e9e1826e1 100644
--- a/rules/windows/process_creation/proc_creation_win_susp_rundll32_spawn_explorer.yml
+++ b/rules/windows/process_creation/proc_creation_win_susp_rundll32_spawn_explorer.yml
@@ -1,9 +1,10 @@
 title: RunDLL32 Spawning Explorer
 id: caa06de8-fdef-4c91-826a-7f9e163eef4b
 description: Detects RunDLL32.exe spawning explorer.exe as child, which is very uncommon, often observes Gamarue spawning the explorer.exe process in an unusual way
-author: elhoim
+author: elhoim, CD_ROM_
 status: experimental
 date: 2022/04/27
+modified: 2022/05/25
 references:
   - https://redcanary.com/blog/intelligence-insights-november-2021/
 tags:
@@ -16,7 +17,9 @@ detection:
   selection:
     ParentImage|endswith: '\rundll32.exe'
     Image|endswith: '\explorer.exe'
-  condition: selection
+  filter:
+    ParentCommandLine|contains: '\shell32.dll,Control_RunDLL'
+  condition: selection and not filter
 falsepositives:
   - Unknown
 level: high
diff --git a/rules/windows/registry/registry_set/registry_set_custom_file_open_handler_powershell_execution.yml b/rules/windows/registry/registry_set/registry_set_custom_file_open_handler_powershell_execution.yml
new file mode 100644
index 000000000..c13f6736d
--- /dev/null
+++ b/rules/windows/registry/registry_set/registry_set_custom_file_open_handler_powershell_execution.yml
@@ -0,0 +1,25 @@
+title: Custom File Open Handler Executes PowerShell
+id: 7530b96f-ad8e-431d-a04d-ac85cc461fdc
+description: Detects the abuse of custom file open handler, executing powershell
+author: CD_R0M_
+date: 2022/06/11
+status: experimental
+references:
+    - https://news.sophos.com/en-us/2022/02/01/solarmarker-campaign-used-novel-registry-changes-to-establish-persistence/?cmp=30728
+logsource:
+    category: registry_set
+    product: windows
+detection:
+    selection:
+        TargetObject|contains: 'shell\open\command\'
+        Details|contains|all:
+            - 'powershell'
+            - '-command'
+        EventType: SetValue
+    condition: selection
+falsepositives:
+    - Unknown
+level: high
+tags:
+    - attack.defense_evasion
+    - attack.t1202