diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1454c87b..ab0e521d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 todo: improve behaviorue of toolbar customization menu
 
 ### Fixed
+- fixed Sandboxie-Plus 1.12.4 + failed to start start.exe in confidential box [#3514](https://github.com/sandboxie-plus/Sandboxie/issues/3514)
 - fixed fix for [#3475](https://github.com/sandboxie-plus/Sandboxie/issues/3475) not working without FileRootPath being explicitly set
 - fixed "The directory name is invalid" when starting a process in a encrypted private box [#3475](https://github.com/sandboxie-plus/Sandboxie/issues/3475)
 
diff --git a/Sandboxie/core/drv/file_flt.c b/Sandboxie/core/drv/file_flt.c
index 86c3a016..6f9026dd 100644
--- a/Sandboxie/core/drv/file_flt.c
+++ b/Sandboxie/core/drv/file_flt.c
@@ -505,7 +505,11 @@ check:
 
                     //DbgPrint("IRP_MJ_CREATE: %S\n", root->file_root);
 
-                    if (Util_IsProtectedProcess(PsGetCurrentProcessId()))
+                    //
+                    // csrss.exe needs acces to binaries of starting up processes,
+                    //
+
+                    if (Util_IsCsrssProcess(PsGetCurrentProcessId()))
                         break;
 
                     status = STATUS_ACCESS_DENIED;
diff --git a/Sandboxie/core/drv/thread.c b/Sandboxie/core/drv/thread.c
index 0fd69ad3..3c5aa87c 100644
--- a/Sandboxie/core/drv/thread.c
+++ b/Sandboxie/core/drv/thread.c
@@ -1202,7 +1202,9 @@ _FX ACCESS_MASK Thread_CheckObject_CommonEx(
                         //
 
                         if (protect_process /*&& MyIsProcessRunningAsSystemAccount(cur_pid)*/) {
-                            if ((_wcsicmp(nptr, SBIESVC_EXE) == 0) || Util_IsProtectedProcess(cur_pid)
+                            if ((_wcsicmp(nptr, SBIESVC_EXE) == 0) 
+                                || Util_IsCsrssProcess(cur_pid)
+                                || Util_IsProtectedProcess(cur_pid)
                                 || (_wcsicmp(nptr, L"conhost.exe") == 0)
                                 || (_wcsicmp(nptr, L"taskmgr.exe") == 0) || (_wcsicmp(nptr, L"sandman.exe") == 0))
                                 protect_process = FALSE;
diff --git a/Sandboxie/core/drv/util.c b/Sandboxie/core/drv/util.c
index 14091c1c..c5482dc8 100644
--- a/Sandboxie/core/drv/util.c
+++ b/Sandboxie/core/drv/util.c
@@ -446,6 +446,36 @@ retry:
 }
 
 
+//---------------------------------------------------------------------------
+// Util_IsCsrssProcess
+//---------------------------------------------------------------------------
+
+NTKERNELAPI PCHAR NTAPI PsGetProcessImageFileName(_In_ PEPROCESS Process);
+
+_FX BOOLEAN Util_IsCsrssProcess(HANDLE pid)
+{
+    PEPROCESS ProcessObject;
+    NTSTATUS status;
+    PCHAR ImageFileName;
+    BOOLEAN ret = FALSE;
+
+    if (!MyIsProcessRunningAsSystemAccount(pid))
+        return FALSE;
+
+    status = PsLookupProcessByProcessId(pid, &ProcessObject);
+    if (NT_SUCCESS(status)) {
+
+        ImageFileName = PsGetProcessImageFileName(ProcessObject);
+
+        ret = (_stricmp(ImageFileName, "csrss.exe") == 0);
+
+        ObDereferenceObject(ProcessObject);
+    }
+
+    return ret;
+}
+
+
 //---------------------------------------------------------------------------
 // Util_IsProtectedProcess
 //---------------------------------------------------------------------------
diff --git a/Sandboxie/core/drv/util.h b/Sandboxie/core/drv/util.h
index af67a579..63675077 100644
--- a/Sandboxie/core/drv/util.h
+++ b/Sandboxie/core/drv/util.h
@@ -109,6 +109,8 @@ NTSTATUS MyValidateCertificate(void);
 
 HANDLE Util_GetProcessPidByName(const WCHAR* name);
 
+BOOLEAN Util_IsCsrssProcess(HANDLE pid);
+
 BOOLEAN Util_IsProtectedProcess(HANDLE pid);
 
 LARGE_INTEGER Util_GetTimestamp(void);