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Forked fromklezVirus/EtwStartWebClient.cs
CreatedJanuary 13, 2023 15:18
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A PoC in C# to enable WebClient Programmatically
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| usingSystem.Runtime.InteropServices; | |
| usingSystem; | |
| /* | |
| * Simple C# PoC to enable WebClient Service Programmatically | |
| * Based on the C++ version from @tirannido (James Forshaw) | |
| * Twitter: https://twitter.com/tiraniddo | |
| * URL: https://www.tiraniddo.dev/2015/03/starting-webclient-service.html | |
| * | |
| * Compile with: | |
| * - 32-bit: C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe .\EtwStartWebClient.cs /unsafe | |
| * - 64-bit: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe .\EtwStartWebClient.cs /unsafe | |
| */ | |
| namespaceEtwStartWebClient | |
| { | |
| classEtwStartWebClient | |
| { | |
| staticvoidMain(string[]args) | |
| { | |
| if(StartWebClientService()){ | |
| Console.WriteLine("[+] WebClient Service started successfully"); | |
| } | |
| else{ | |
| Console.WriteLine("[-] Failed to start WebClient Service"); | |
| } | |
| } | |
| staticboolStartWebClientService() | |
| { | |
| Guid_MS_Windows_WebClntLookupServiceTrigger_Provider=newGuid(0x22B6D684,0xFA63,0x4578,0x87,0xC9,0xEF,0xFC,0xBE,0x66,0x43,0xC7); | |
| Win32.EVENT_DESCRIPTOReventDescriptor=newWin32.EVENT_DESCRIPTOR(); | |
| ulongregHandle=0; | |
| Win32.WINERRORwinError=Win32.EventRegister( | |
| ref_MS_Windows_WebClntLookupServiceTrigger_Provider, | |
| IntPtr.Zero, | |
| IntPtr.Zero, | |
| refregHandle | |
| ); | |
| if(winError==((ulong)Win32.WINERROR.ERROR_SUCCESS)) | |
| { | |
| unsafe{ | |
| if(Win32.EventWrite( | |
| regHandle, | |
| refeventDescriptor, | |
| 0, | |
| null | |
| )==Win32.WINERROR.ERROR_SUCCESS){ | |
| Win32.EventUnregister(regHandle); | |
| returntrue; | |
| } | |
| } | |
| } | |
| returnfalse; | |
| } | |
| } | |
| classWin32 | |
| { | |
| publicenumWINERROR:ulong{ | |
| ERROR_SUCCESS=0x0, | |
| ERROR_INVALID_PARAMETER=0x57, | |
| ERROR_INVALID_HANDLE=0x6, | |
| ERROR_ARITHMETIC_OVERFLOW=0x216, | |
| ERROR_MORE_DATA=0xEA, | |
| ERROR_NOT_ENOUGH_MEMORY=0x8, | |
| STATUS_LOG_FILE_FULL=0xC0000188, | |
| } | |
| [StructLayout(LayoutKind.Explicit,Size=16)] | |
| publicclassEVENT_DESCRIPTOR | |
| { | |
| [FieldOffset(0)]ushortId=1; | |
| [FieldOffset(2)]byteVersion=0; | |
| [FieldOffset(3)]byteChannel=0; | |
| [FieldOffset(4)]byteLevel=4; | |
| [FieldOffset(5)]byteOpcode=0; | |
| [FieldOffset(6)]ushortTask=0; | |
| [FieldOffset(8)]longKeyword=0; | |
| } | |
| [StructLayout(LayoutKind.Explicit,Size=16)] | |
| publicstructEVENT_DATA_DESCRIPTOR | |
| { | |
| [FieldOffset(0)] | |
| internalUInt64DataPointer; | |
| [FieldOffset(8)] | |
| internaluintSize; | |
| [FieldOffset(12)] | |
| internalintReserved; | |
| } | |
| [DllImport("Advapi32.dll",SetLastError=true)] | |
| publicstaticexternWINERROREventRegister(refGuidguid,[Optional]IntPtrEnableCallback,[Optional]IntPtrCallbackContext,[In][Out]refulongRegHandle); | |
| [DllImport("Advapi32.dll",SetLastError=true)] | |
| publicstaticexternunsafeWINERROREventWrite(ulongRegHandle,refEVENT_DESCRIPTOREventDescriptor,uintUserDataCount,EVENT_DATA_DESCRIPTOR*UserData); | |
| [DllImport("Advapi32.dll",SetLastError=true)] | |
| publicstaticexternWINERROREventUnregister(ulongRegHandle); | |
| } | |
| } |
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