Themida 3.x Unpacker -

Themida 3.x often resolves APIs via a giant jmp dword ptr [register+offset] table. To rebuild:

Here's an example unpacker code in C:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <windows.h>
// Define the OEP and memory dump functions
DWORD find_oep(HANDLE hProcess, LPCVOID lpBaseAddress);
VOID dump_memory(HANDLE hProcess, LPCVOID lpBaseAddress, DWORD dwSize, LPCSTR lpDumpFile);
int main() 
    // Specify the protected executable and output file
    LPCSTR lpProtectedExecutable = "protected.exe";
    LPCSTR lpOutputFile = "unpacked.exe";
// Open the protected executable
    HANDLE hFile = CreateFileA(lpProtectedExecutable, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (hFile == INVALID_HANDLE_VALUE) 
        printf("Failed to open protected executable\n");
        return 1;
// Map the file into memory
    HANDLE hMapFile = CreateFileMappingA(hFile, NULL, PAGE_READONLY, 0, 0, NULL);
    if (hMapFile == NULL) 
        printf("Failed to create file mapping\n");
        CloseHandle(hFile);
        return 1;
// Get the base address of the mapped file
    LPCVOID lpBaseAddress = MapViewOfFile(hMapFile, FILE_MAP_READ, 0, 0, 0);
    if (lpBaseAddress == NULL) 
        printf("Failed to map view of file\n");
        CloseHandle(hMapFile);
        CloseHandle(hFile);
        return 1;
// Find the OEP
    DWORD oep = find_oep(GetCurrentProcess(), lpBaseAddress);
    if (oep == 0) 
        printf("Failed to find OEP\n");
        UnmapViewOfFile(lpBaseAddress);
        CloseHandle(hMapFile);
        CloseHandle(hFile);
        return 1;
// Dump the memory
    dump_memory(GetCurrentProcess(), lpBaseAddress, 0x100000, "memory.dump");
// Reconstruct the import table
    // ...
// Write the unpacked executable
    HANDLE hOutputFile = CreateFileA(lpOutputFile, GENERIC_WRITE, FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
    if (hOutputFile == INVALID_HANDLE_VALUE) 
        printf("Failed to create output file\n");
        UnmapViewOfFile(lpBaseAddress);
        CloseHandle(hMapFile);
        CloseHandle(hFile);
        return 1;
// Write the unpacked code
    DWORD dwSize = 0x100000;
    WriteFile(hOutputFile, lpBaseAddress, dwSize, &dwSize, NULL);
// Close handles
    CloseHandle(hOutputFile);
    UnmapViewOfFile(lpBaseAddress);
    CloseHandle(hMapFile);
    CloseHandle(hFile);
return 0;
// Define the OEP and memory dump functions
DWORD find_oep(HANDLE hProcess, LPCVOID lpBaseAddress) 
    // TO DO: implement OEP finding logic
    return 0x100000;
VOID dump_memory(HANDLE hProcess, LPCVOID lpBaseAddress, DWORD dwSize, LPCSTR lpDumpFile) 
    // TO DO: implement memory dumping logic

Note: This is a basic example and may require modifications to work with your specific use case.

No. Themida 3.x implements CRC checks on all executable pages. An INT 3 instruction (opcode 0xCC) will change the CRC, and the protection will call TerminateProcess within 2 milliseconds.

Finding the Original Entry Point (OEP) in Themida 3.x is difficult because the entry point is often virtualized.

The leap from Themida 2.x to 3.x involved moving from a linear VM dispatcher to a polymorphic dispatcher. In 2.x, the VM handler could be identified by a signature (e.g., mov r32, [rsp] ; jmp r32). In 3.x, the dispatcher changes shape per build. Furthermore, 3.x introduced hardware breakpoint obfuscation via DR register manipulation and deeper integration with Windows 10/11 process mitigation policies.

This is the closest to a true unpacker. The workflow:

Best tool for 3.x: Scylla v0.9.8+ (with advanced IAT search) combined with x64dbg and TitanHide v3.x.