mirror of
https://github.com/cheat-engine/cheat-engine
synced 2026-08-15 02:26:08 -04:00
327 lines
9.8 KiB
C
327 lines
9.8 KiB
C
/*
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sigcheck is responsible for checking if the controlling process is Cheat Engine or another program signed by Dark Byte and not someone elses/modified one
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This is only in case of a signed release build
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*/
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#include <ntifs.h>
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#include <windef.h>
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#include <bcrypt.h>
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#include <Ntstrsafe.h>
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#include <ntimage.h>
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#include "sigcheck.h"
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unsigned char publicKey[]={0x45, 0x43, 0x53, 0x35, 0x42, 0x00, 0x00, 0x00, 0x00, 0x3A, 0xBA, 0x72, 0xCF, 0xA7, 0x79, 0xFA, 0x92, 0x96, 0x15, 0x8E, 0x69, 0x35, 0x19, 0x09, 0x99, 0x3C, 0x97, 0xE8, 0x18, 0x0B, 0xC6, 0x2C, 0x8B, 0x24, 0x5A, 0xD8, 0x1C, 0x86, 0x83, 0x89, 0xE7, 0xA4, 0xA9, 0x47, 0x11, 0x7E, 0x07, 0x74, 0x69, 0x74, 0x33, 0x0B, 0x1A, 0xB8, 0x63, 0x11, 0x51, 0xEA, 0x00, 0xD6, 0x26, 0xE7, 0x7C, 0x6D, 0x77, 0xA5, 0x0E, 0x9F, 0x37, 0x87, 0x7B, 0x79, 0x2F, 0xEE, 0x00, 0x65, 0x7A, 0xBF, 0x44, 0x79, 0xD1, 0x7E, 0x47, 0xBC, 0xF9, 0x6F, 0x31, 0x81, 0x85, 0x70, 0x78, 0x5D, 0xED, 0xA5, 0xC6, 0x15, 0x0F, 0x2C, 0x0A, 0x27, 0x3B, 0x3E, 0x36, 0xEB, 0x53, 0x3E, 0x3E, 0x75, 0xC1, 0xA3, 0x0A, 0xC0, 0xC1, 0x53, 0x3A, 0x77, 0xFB, 0x84, 0x88, 0x35, 0xE8, 0x86, 0xF0, 0xA2, 0x52, 0x86, 0x5D, 0x12, 0x2D, 0x03, 0x88, 0x00, 0x36, 0x2B, 0x8D, 0x21, 0x13, 0x99, 0x7F, 0x62};
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NTSYSAPI NTSTATUS NTAPI ZwQueryInformationProcess(IN HANDLE ProcessHandle, IN PROCESSINFOCLASS ProcessInformationClass, OUT PVOID ProcessInformation, IN ULONG ProcessInformationLength, OUT PULONG ReturnLength OPTIONAL);
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NTSYSAPI NTSTATUS NTAPI ZwQueryInformationThread(IN HANDLE ThreadHandle, IN THREADINFOCLASS ThreadInformationClass, OUT PVOID ThreadInformation, IN ULONG ThreadInformationLength, OUT PULONG ReturnLength OPTIONAL);
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NTSTATUS LoadFile(PUNICODE_STRING filename, PVOID *buffer, DWORD *size)
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/*
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Loads the specified file into paged memory
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pre: filename must be valid
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post:
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buffer will get a pointer to the loaded file
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Size will get the size of the file
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Caller is responsible for calling ExFreePool on the buffer
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*/
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{
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HANDLE hFile;
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OBJECT_ATTRIBUTES oa;
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FILE_STANDARD_INFORMATION fsi;
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IO_STATUS_BLOCK statusblock;
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NTSTATUS s=STATUS_UNSUCCESSFUL;
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InitializeObjectAttributes(&oa, filename, 0, NULL, NULL);
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s=ZwCreateFile(&hFile,SYNCHRONIZE|STANDARD_RIGHTS_READ , &oa, &statusblock, NULL, FILE_SYNCHRONOUS_IO_NONALERT| FILE_ATTRIBUTE_NORMAL, 0, FILE_OPEN, 0, NULL, 0);
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if (s==STATUS_SUCCESS)
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{
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s=ZwQueryInformationFile(hFile, &statusblock, &fsi, sizeof(fsi), FileStandardInformation);
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if (fsi.EndOfFile.HighPart==0)
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{
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*size=fsi.EndOfFile.LowPart;
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*buffer=ExAllocatePool(PagedPool, fsi.EndOfFile.LowPart); //caller MUST free this
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if (*buffer)
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{
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LARGE_INTEGER ByteOffset;
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ByteOffset.QuadPart=0;
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s=ZwReadFile(hFile, NULL, NULL, NULL, &statusblock, *buffer, fsi.EndOfFile.LowPart, &ByteOffset, NULL);
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if (s==STATUS_PENDING)
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s=ZwWaitForSingleObject(hFile, FALSE, NULL);
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if (s==STATUS_SUCCESS)
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s=statusblock.Status;
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if (s!=STATUS_SUCCESS) //read error, free the buffer
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ExFreePool(*buffer);
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}
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}
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ZwClose(hFile);
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}
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return s;
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}
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NTSTATUS CheckSignature(PVOID buffer, DWORD buffersize, PVOID sig, DWORD sigsize)
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/*
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Calculates a hash from the buffer and then checks the signature
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*/
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{
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NTSTATUS s=STATUS_UNSUCCESSFUL;
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BCRYPT_ALG_HANDLE hashAlgoritm;
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s=BCryptOpenAlgorithmProvider(&hashAlgoritm, BCRYPT_SHA512_ALGORITHM, NULL, 0);
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if (s==STATUS_SUCCESS)
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{
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DbgPrint("Created a hash algoritm\n");
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if (s==STATUS_SUCCESS)
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{
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DWORD objectlength;
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ULONG size;
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s=BCryptGetProperty(hashAlgoritm, BCRYPT_OBJECT_LENGTH, (PUCHAR)&objectlength, sizeof(DWORD), &size, 0);
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if (s==STATUS_SUCCESS)
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{
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BCRYPT_HASH_HANDLE hHash;
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PUCHAR pbHashObject=ExAllocatePool(PagedPool, objectlength);
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if (pbHashObject)
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{
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s=BCryptCreateHash(hashAlgoritm, &hHash, pbHashObject, objectlength, (PUCHAR)NULL, 0, 0);
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if (s==STATUS_SUCCESS)
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{
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s=BCryptHashData(hHash, buffer, buffersize, 0);
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if (s==STATUS_SUCCESS)
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{
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DWORD hashlength;
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s=BCryptGetProperty(hashAlgoritm, BCRYPT_HASH_LENGTH, (PUCHAR)&hashlength, sizeof(DWORD), &size, 0);
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if (s==STATUS_SUCCESS)
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{
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PUCHAR pbHashBuffer=ExAllocatePool(PagedPool, hashlength);
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if (pbHashBuffer)
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{
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s=BCryptFinishHash(hHash, pbHashBuffer, hashlength, 0);
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if (s==STATUS_SUCCESS)
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{
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BCRYPT_ALG_HANDLE SignAlgoritm;
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s=BCryptOpenAlgorithmProvider(&SignAlgoritm, BCRYPT_ECDSA_P521_ALGORITHM, NULL, 0);
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if (s==STATUS_SUCCESS)
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{
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BCRYPT_KEY_HANDLE hKey;
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s=BCryptImportKeyPair(SignAlgoritm, 0, BCRYPT_ECCPUBLIC_BLOB, &hKey, publicKey, 140, 0);
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if (s==STATUS_SUCCESS)
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{
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s=BCryptVerifySignature(hKey, NULL, pbHashBuffer, hashlength, sig, sigsize, 0);
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if (s==STATUS_SUCCESS)
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{
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DbgPrint("Valid signature");
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}
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else
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{
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//Invalid signature. Wait a bit before returning
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LARGE_INTEGER timeout;
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timeout.QuadPart=-(LONGLONG)2* 10 * 1000 * 1000; // WDF_REL_TIMEOUT_IN_SEC(2);
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KeDelayExecutionThread(UserMode, FALSE, &timeout);
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DbgPrint("Signature failure: %x\n", s);
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}
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BCryptDestroyKey(hKey);
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}
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else
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DbgPrint("ImportKeyPair fail\n");
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BCryptCloseAlgorithmProvider(SignAlgoritm,0);
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}
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else
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DbgPrint("OpenSignAlgoritm fail\n");
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}
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else
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DbgPrint("FinishHash Failed\n");
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ExFreePool(pbHashBuffer);
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}
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else
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DbgPrint("Failed allocating pbHashBuffer\n");
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}
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else
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DbgPrint("BCRYPT_OBJECT_LENGTH hash failure\n");
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}
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else
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DbgPrint("Failure hashing data\n");
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BCryptDestroyHash(hHash);
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}
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else
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DbgPrint("CreateHash failed\n");
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ExFreePool(pbHashObject);
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}
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else
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DbgPrint("Failure allocating room for pbHashObject\n");
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}
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else
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DbgPrint("BCRYPT_OBJECT_LENGTH alg failure\n");
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}
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BCryptCloseAlgorithmProvider(hashAlgoritm,0);
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}
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else
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DbgPrint("Failed getting a hash algoritm\n");
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//DbgPrint("returning %x\n", s);
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return s;
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}
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NTSTATUS TestProcess(PIMAGE_DOS_HEADER buf, DWORD size)
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{
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UINT_PTR maxAddress = (UINT_PTR)buf + size;
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if (buf->e_magic != IMAGE_DOS_SIGNATURE)
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return STATUS_UNSUCCESSFUL;
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if ((DWORD)buf->e_lfanew >= size)
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return STATUS_UNSUCCESSFUL;
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PIMAGE_NT_HEADERS nth = (PIMAGE_NT_HEADERS)((UINT_PTR)buf + buf->e_lfanew);
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if (nth->Signature != IMAGE_NT_SIGNATURE)
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return STATUS_UNSUCCESSFUL;
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PIMAGE_SECTION_HEADER sections = IMAGE_FIRST_SECTION(nth);
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if ((UINT_PTR)sections >= maxAddress)
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return STATUS_UNSUCCESSFUL;
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int i;
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for (i = 0; i < nth->FileHeader.NumberOfSections; i++)
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{
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if (strcmp((char *)sections[i].Name, ".text") == 0)
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{
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if (((UINT_PTR)buf + sections[i].PointerToRawData + sections[i].SizeOfRawData) >= maxAddress)
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return STATUS_UNSUCCESSFUL;
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//BSOD on purpose if this isn't a match
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if (RtlCompareMemory((void*)(0x00400000 + sections[i].VirtualAddress), (void*)((UINT_PTR)buf + sections[i].PointerToRawData), sections[i].SizeOfRawData) == sections[i].SizeOfRawData)
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{
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//seems ok. Confirm the caller is from this .text section
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UINT_PTR startaddress;
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DWORD length;
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if (ZwQueryInformationThread(ZwCurrentThread(), (THREADINFOCLASS)ThreadQuerySetWin32StartAddress, &startaddress, sizeof(startaddress), &length) == STATUS_SUCCESS)
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{
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if ((startaddress >= (0x00400000 + sections[i].VirtualAddress)) && (startaddress < (0x00400000 + sections[i].VirtualAddress + sections[i].SizeOfRawData)))
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return STATUS_SUCCESS;
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else
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return STATUS_UNSUCCESSFUL;
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}
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else
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return STATUS_UNSUCCESSFUL;
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}
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else
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return STATUS_UNSUCCESSFUL;
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}
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}
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return STATUS_UNSUCCESSFUL;
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}
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NTSTATUS CheckSignatureOfFile(PUNICODE_STRING originalpath, BOOL isProcess)
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{
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NTSTATUS s=STATUS_UNSUCCESSFUL;
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PVOID file=NULL;
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DWORD filesize;
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PVOID sig=NULL;
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DWORD sigsize;
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WCHAR MyBuffer[MAX_PATH*2];
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UNICODE_STRING p;
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PUNICODE_STRING path=&p;
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DbgPrint("CheckSignatureOfFile: ");
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p.Buffer=MyBuffer;
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p.Length=0;
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p.MaximumLength=MAX_PATH*2;
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s=RtlUnicodeStringCopy(path, originalpath);
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if (s!=STATUS_SUCCESS)
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{
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DbgPrint("Failure duplicating path: %x\n", s);
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return s;
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}
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s=LoadFile(path, &file, &filesize);
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if (s==STATUS_SUCCESS)
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{
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s=RtlAppendUnicodeToString(path, L".sig");
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if (s==STATUS_SUCCESS)
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{
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s=LoadFile(path, &sig, &sigsize);
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if (s==STATUS_SUCCESS)
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{
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s=CheckSignature(file,filesize,sig,sigsize);
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ExFreePool(sig);
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if ((s == STATUS_SUCCESS) && isProcess) //one extra check to see if it's actually CE and not just something renamed afterwards
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s=TestProcess((PIMAGE_DOS_HEADER)file, filesize);
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}
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else
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DbgPrint("Failure loading %S\n", path->Buffer);
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}
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ExFreePool(file);
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}
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else
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DbgPrint("Failure loading %S\n", path->Buffer);
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//DbgPrint("returning %x\n", s);
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return s;
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}
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NTSTATUS SecurityCheck(void)
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/*
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Checks the current process for a valid signature
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*/
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{
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NTSTATUS s=STATUS_UNSUCCESSFUL;
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char *buffer[MAX_PATH*2+sizeof(UNICODE_STRING)];
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PUNICODE_STRING path=(PUNICODE_STRING)&buffer[0];
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ULONG length;
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if (KeGetCurrentIrql() != PASSIVE_LEVEL)
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return STATUS_UNSUCCESSFUL;
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if (ZwQueryInformationProcess(ZwCurrentProcess(), ProcessImageFileName, buffer, MAX_PATH*2, &length)==STATUS_SUCCESS)
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{
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path->MaximumLength=MAX_PATH*2;
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s=CheckSignatureOfFile(path,1);
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//DbgPrint("returning %x\n", s);
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return s;
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}
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else
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return STATUS_UNSUCCESSFUL;
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}
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