553 lines
17 KiB
Ruby
553 lines
17 KiB
Ruby
#!/usr/bin/env ruby
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require 'unicorn_engine'
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require 'unicorn_engine/x86_const'
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include UnicornEngine
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X86_CODE32 = "\x41\x4a" # INC ecx; DEC edx
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X86_CODE32_LOOP = "\x41\x4a\xeb\xfe" # INC ecx; DEC edx; JMP self-loop
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X86_CODE32_MEM_READ = "\x8B\x0D\xAA\xAA\xAA\xAA\x41\x4a" # mov ecx,[0xaaaaaaaa]; INC ecx; DEC edx
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X86_CODE32_MEM_WRITE = "\x89\x0D\xAA\xAA\xAA\xAA\x41\x4a" # mov [0xaaaaaaaa], ecx; INC ecx; DEC edx
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X86_CODE64 = "\x41\xBC\x3B\xB0\x28\x2A\x49\x0F\xC9\x90\x4D\x0F\xAD\xCF\x49\x87\xFD\x90\x48\x81\xD2\x8A\xCE\x77\x35\x48\xF7\xD9\x4D\x29\xF4\x49\x81\xC9\xF6\x8A\xC6\x53\x4D\x87\xED\x48\x0F\xAD\xD2\x49\xF7\xD4\x48\xF7\xE1\x4D\x19\xC5\x4D\x89\xC5\x48\xF7\xD6\x41\xB8\x4F\x8D\x6B\x59\x4D\x87\xD0\x68\x6A\x1E\x09\x3C\x59"
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X86_CODE32_INOUT = "\x41\xE4\x3F\x4a\xE6\x46\x43" # INC ecx; IN AL, 0x3f; DEC edx; OUT 0x46, AL; INC ebx
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X86_CODE64_SYSCALL = "\x0f\x05" # SYSCALL
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X86_CODE16 = "\x00\x00" # add byte ptr [bx + si], al
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# memory address where emulation starts
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ADDRESS = 0x1000000
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# callback for tracing basic blocks
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HOOK_BLOCK = Proc.new do |uc, address, size, user_data |
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puts(">>> Tracing basic block at 0x%x, block size = 0x%x" % [address, size])
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end
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# callback for tracing instructions
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HOOK_CODE = Proc.new do |uc, address, size, user_data|
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puts(">>> Tracing instruction at 0x%x, instruction size = %u" % [address, size])
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end
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# callback for tracing invalid memory access (READ or WRITE)
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HOOK_MEM_INVALID = lambda do |uc, access, address, size, value, user_data|
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if access == UC_MEM_WRITE_UNMAPPED
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puts(">>> Missing memory is being WRITE at 0x%x, data size = %u, data value = 0x%x" % [address, size, value])
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# map this memory in with 2MB in size
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uc.mem_map(0xaaaa0000, 2 * 1024*1024)
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# return True to indicate we want to continue emulation
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return true
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else
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puts(">>> Missing memory is being READ at 0x%x" % address)
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# return False to indicate we want to stop emulation
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return false
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end
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end
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# callback for tracing memory access (READ or WRITE)
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HOOK_MEM_ACCESS = Proc.new do |uc, access, address, size, value, user_data|
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if access == UC_MEM_WRITE
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puts(">>> Memory is being WRITE at 0x%x, data size = %u, data value = 0x%x" % [address, size, value])
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else # READ
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puts(">>> Memory is being READ at 0x%x, data size = %u" % [address, size])
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end
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end
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# callback for IN instruction
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HOOK_IN = lambda do |uc, port, size, user_data|
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eip = uc.reg_read(UC_X86_REG_EIP)
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puts("--- reading from port 0x%x, size: %u, address: 0x%x" % [port, size, eip])
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if size == 1
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# read 1 byte to AL
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return 0xf1
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end
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if size == 2
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# read 2 byte to AX
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return 0xf2
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end
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if size == 4
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# read 4 byte to EAX
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return 0xf4
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end
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# we should never reach here
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return 0
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end
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# callback for OUT instruction
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HOOK_OUT = Proc.new do |uc, port, size, value, user_data|
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eip = uc.reg_read(UC_X86_REG_EIP)
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puts("--- writing to port 0x%x, size: %u, value: 0x%x, address: 0x%x" % [port, size, value, eip])
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# confirm that value is indeed the value of AL/AX/EAX
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v = 0
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if size == 1
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# read 1 byte in AL
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v = uc.reg_read(UC_X86_REG_AL)
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end
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if size == 2
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# read 2 bytes in AX
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v = uc.reg_read(UC_X86_REG_AX)
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end
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if size == 4
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# read 4 bytes in EAX
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v = uc.reg_read(UC_X86_REG_EAX)
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end
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puts("--- register value = 0x%x" %v)
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end
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# Test X86 32 bit
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def test_i386()
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puts("Emulate i386 code")
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begin
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# Initialize emulator in X86-32bit mode
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mu = Uc.new UC_ARCH_X86, UC_MODE_32
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# map 2MB memory for this emulation
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mu.mem_map(ADDRESS, 2 * 1024 * 1024)
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# write machine code to be emulated to memory
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mu.mem_write(ADDRESS, X86_CODE32)
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# initialize machine registers
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mu.reg_write(UC_X86_REG_ECX, 0x1234)
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mu.reg_write(UC_X86_REG_EDX, 0x7890)
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# tracing all basic blocks with customized callback
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mu.hook_add(UC_HOOK_BLOCK, HOOK_BLOCK)
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# tracing all instructions with customized callback
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mu.hook_add(UC_HOOK_CODE, HOOK_CODE)
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mu.hook_add(UC_HOOK_MEM_READ_UNMAPPED, HOOK_MEM_INVALID)
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# emulate machine code in infinite time
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mu.emu_start(ADDRESS, ADDRESS + X86_CODE32.bytesize)
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# now print out some registers
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puts(">>> Emulation done. Below is the CPU context")
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r_ecx = mu.reg_read(UC_X86_REG_ECX)
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r_edx = mu.reg_read(UC_X86_REG_EDX)
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puts(">>> ECX = 0x%x" % r_ecx)
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puts(">>> EDX = 0x%x" % r_edx)
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# read from memory
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tmp = mu.mem_read(ADDRESS, 2)
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print(">>> Read 2 bytes from [0x%x] =" % (ADDRESS))
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tmp.each_byte { |i| print(" 0x%x" % i) }
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puts
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rescue UcError => e
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puts("ERROR: %s" % e)
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end
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end
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def test_i386_loop()
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puts("Emulate i386 code with infinite loop - wait for 2 seconds then stop emulation")
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begin
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# Initialize emulator in X86-32bit mode
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mu = Uc.new UC_ARCH_X86, UC_MODE_32
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# map 2MB memory for this emulation
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mu.mem_map(ADDRESS, 2 * 1024 * 1024)
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# write machine code to be emulated to memory
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mu.mem_write(ADDRESS, X86_CODE32_LOOP)
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# initialize machine registers
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mu.reg_write(UC_X86_REG_ECX, 0x1234)
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mu.reg_write(UC_X86_REG_EDX, 0x7890)
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# emulate machine code in infinite time
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mu.emu_start(ADDRESS, ADDRESS + X86_CODE32_LOOP.bytesize, 2 * UC_SECOND_SCALE)
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# now print out some registers
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puts(">>> Emulation done. Below is the CPU context")
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r_ecx = mu.reg_read(UC_X86_REG_ECX)
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r_edx = mu.reg_read(UC_X86_REG_EDX)
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puts(">>> ECX = 0x%x" % r_ecx)
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puts(">>> EDX = 0x%x" % r_edx)
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rescue UcError => e
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puts("ERROR: %s" % e)
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end
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end
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def test_i386_invalid_mem_read()
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puts("Emulate i386 code that read from invalid memory")
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begin
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# Initialize emulator in X86-32bit mode
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mu = Uc.new UC_ARCH_X86, UC_MODE_32
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# map 2MB memory for this emulation
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mu.mem_map(ADDRESS, 2 * 1024 * 1024)
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# write machine code to be emulated to memory
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mu.mem_write(ADDRESS, X86_CODE32_MEM_READ)
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# initialize machine registers
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mu.reg_write(UC_X86_REG_ECX, 0x1234)
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mu.reg_write(UC_X86_REG_EDX, 0x7890)
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# tracing all basic blocks with customized callback
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mu.hook_add(UC_HOOK_BLOCK, HOOK_BLOCK)
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# tracing all instructions with customized callback
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mu.hook_add(UC_HOOK_CODE, HOOK_CODE)
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begin
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# emulate machine code in infinite time
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mu.emu_start(ADDRESS, ADDRESS + X86_CODE32_MEM_READ.bytesize)
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rescue UcError => e
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puts("ERROR: %s" % e)
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end
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# now print out some registers
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puts(">>> Emulation done. Below is the CPU context")
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r_ecx = mu.reg_read(UC_X86_REG_ECX)
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r_edx = mu.reg_read(UC_X86_REG_EDX)
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puts(">>> ECX = 0x%x" % r_ecx)
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puts(">>> EDX = 0x%x" % r_edx)
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rescue UcError => e
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print("ERROR: %s" % e)
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end
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end
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def test_i386_invalid_mem_write()
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puts("Emulate i386 code that write to invalid memory")
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begin
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# Initialize emulator in X86-32bit mode
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mu = Uc.new UC_ARCH_X86, UC_MODE_32
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# map 2MB memory for this emulation
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mu.mem_map(ADDRESS, 2 * 1024 * 1024)
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# write machine code to be emulated to memory
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mu.mem_write(ADDRESS, X86_CODE32_MEM_WRITE)
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# initialize machine registers
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mu.reg_write(UC_X86_REG_ECX, 0x1234)
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mu.reg_write(UC_X86_REG_EDX, 0x7890)
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# tracing all basic blocks with customized callback
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#mu.hook_add(UC_HOOK_BLOCK, HOOK_BLOCK)
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# tracing all instructions with customized callback
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#mu.hook_add(UC_HOOK_CODE, HOOK_CODE)
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# intercept invalid memory events
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mu.hook_add(UC_HOOK_MEM_READ_UNMAPPED | UC_HOOK_MEM_WRITE_UNMAPPED, HOOK_MEM_INVALID)
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begin
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# emulate machine code in infinite time
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mu.emu_start(ADDRESS, ADDRESS + X86_CODE32_MEM_WRITE.bytesize)
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rescue UcError => e
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puts "ERROR: %s" % e
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end
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# now print out some registers
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puts ">>> Emulation done. Below is the CPU context"
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r_ecx = mu.reg_read(UC_X86_REG_ECX)
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r_edx = mu.reg_read(UC_X86_REG_EDX)
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puts ">>> ECX = 0x%x" % r_ecx
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puts ">>> EDX = 0x%x" % r_edx
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begin
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# read from memory
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print ">>> Read 4 bytes from [0x%x] = " % (0xaaaaaaaa)
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tmp = mu.mem_read(0xaaaaaaaa, 4)
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tmp.each_byte { |i| print(" 0x%x" % i) }
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puts
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print ">>> Read 4 bytes from [0x%x] = " % 0xffffffaa
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tmp = mu.mem_read(0xffffffaa, 4)
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tmp.each_byte { |i| puts(" 0x%x" % i) }
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puts
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rescue UcError => e
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puts "ERROR: %s" % e
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end
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rescue UcError => e
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puts "ERROR: %s" % e
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end
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end
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def test_i386_context_save()
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puts("Save/restore CPU context in opaque blob")
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address = 0
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code = '\x40' # inc eax
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begin
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# Initialize emulator
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mu = Uc.new UC_ARCH_X86, UC_MODE_32
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# map 8KB memory for this emulation
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mu.mem_map(address, 8 * 1024, UC_PROT_ALL)
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# write machine code to be emulated to memory
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mu.mem_write(address, code)
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# set eax to 1
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mu.reg_write(UC_X86_REG_EAX, 1)
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puts(">>> Running emulation for the first time")
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mu.emu_start(address, address+1)
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puts(">>> Emulation done. Below is the CPU context")
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puts(">>> EAX = 0x%x" %(mu.reg_read(UC_X86_REG_EAX)))
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puts(">>> Saving CPU context")
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saved_context = mu.context_save()
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puts(">>> Running emulation for the second time")
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mu.emu_start(address, address+1)
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puts(">>> Emulation done. Below is the CPU context")
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puts(">>> EAX = 0x%x" %(mu.reg_read(UC_X86_REG_EAX)))
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puts(">>> CPU context restored. Below is the CPU context")
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mu.context_restore(saved_context)
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puts(">>> EAX = 0x%x" %(mu.reg_read(UC_X86_REG_EAX)))
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rescue UcError => e
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puts("ERROR: %s" % e)
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end
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end
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# Test X86 32 bit with IN/OUT instruction
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def test_i386_inout()
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puts("Emulate i386 code with IN/OUT instructions")
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begin
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# Initialize emulator in X86-32bit mode
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mu = Uc.new UC_ARCH_X86, UC_MODE_32
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# map 2MB memory for this emulation
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mu.mem_map(ADDRESS, 2 * 1024 * 1024)
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# write machine code to be emulated to memory
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mu.mem_write(ADDRESS, X86_CODE32_INOUT)
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# initialize machine registers
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mu.reg_write(UC_X86_REG_EAX, 0x1234)
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mu.reg_write(UC_X86_REG_ECX, 0x6789)
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# tracing all basic blocks with customized callback
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mu.hook_add(UC_HOOK_BLOCK, HOOK_BLOCK)
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# tracing all instructions with customized callback
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mu.hook_add(UC_HOOK_CODE, HOOK_CODE)
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# handle IN & OUT instruction
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mu.hook_add(UC_HOOK_INSN, HOOK_IN, nil, 1, 0, UC_X86_INS_IN)
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mu.hook_add(UC_HOOK_INSN, HOOK_OUT, nil, 1, 0, UC_X86_INS_OUT)
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# emulate machine code in infinite time
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mu.emu_start(ADDRESS, ADDRESS + X86_CODE32_INOUT.bytesize)
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# now print out some registers
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puts(">>> Emulation done. Below is the CPU context")
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r_ecx = mu.reg_read(UC_X86_REG_ECX)
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r_eax = mu.reg_read(UC_X86_REG_EAX)
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puts ">>> EAX = 0x%x" % r_eax
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puts ">>> ECX = 0x%x" % r_ecx
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rescue UcError => e
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puts("ERROR: %s" % e)
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end
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end
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def test_x86_64()
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puts("Emulate x86_64 code")
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begin
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# Initialize emulator in X86-64bit mode
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mu = Uc.new UC_ARCH_X86, UC_MODE_64
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# map 2MB memory for this emulation
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mu.mem_map(ADDRESS, 2 * 1024 * 1024)
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# write machine code to be emulated to memory
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mu.mem_write(ADDRESS, X86_CODE64)
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# initialize machine registers
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mu.reg_write(UC_X86_REG_RAX, 0x71f3029efd49d41d)
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mu.reg_write(UC_X86_REG_RBX, 0xd87b45277f133ddb)
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mu.reg_write(UC_X86_REG_RCX, 0xab40d1ffd8afc461)
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mu.reg_write(UC_X86_REG_RDX, 0x919317b4a733f01)
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mu.reg_write(UC_X86_REG_RSI, 0x4c24e753a17ea358)
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mu.reg_write(UC_X86_REG_RDI, 0xe509a57d2571ce96)
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mu.reg_write(UC_X86_REG_R8, 0xea5b108cc2b9ab1f)
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mu.reg_write(UC_X86_REG_R9, 0x19ec097c8eb618c1)
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mu.reg_write(UC_X86_REG_R10, 0xec45774f00c5f682)
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mu.reg_write(UC_X86_REG_R11, 0xe17e9dbec8c074aa)
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mu.reg_write(UC_X86_REG_R12, 0x80f86a8dc0f6d457)
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mu.reg_write(UC_X86_REG_R13, 0x48288ca5671c5492)
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mu.reg_write(UC_X86_REG_R14, 0x595f72f6e4017f6e)
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mu.reg_write(UC_X86_REG_R15, 0x1efd97aea331cccc)
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# setup stack
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mu.reg_write(UC_X86_REG_RSP, ADDRESS + 0x200000)
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# tracing all basic blocks with customized callback
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mu.hook_add(UC_HOOK_BLOCK, HOOK_BLOCK)
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# tracing all instructions in range [ADDRESS, ADDRESS+20]
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mu.hook_add(UC_HOOK_CODE, HOOK_CODE, 0, ADDRESS, ADDRESS+20)
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# tracing all memory READ & WRITE access
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mu.hook_add(UC_HOOK_MEM_WRITE, HOOK_MEM_ACCESS)
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mu.hook_add(UC_HOOK_MEM_READ, HOOK_MEM_ACCESS)
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# actually you can also use READ_WRITE to trace all memory access
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#mu.hook_add(UC_HOOK_MEM_READ | UC_HOOK_MEM_WRITE, hook_mem_access)
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begin
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# emulate machine code in infinite time
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mu.emu_start(ADDRESS, ADDRESS + X86_CODE64.bytesize)
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rescue UcError => e
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puts("ERROR: %s" % e)
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end
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# now print out some registers
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puts(">>> Emulation done. Below is the CPU context")
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rax = mu.reg_read(UC_X86_REG_RAX)
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rbx = mu.reg_read(UC_X86_REG_RBX)
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rcx = mu.reg_read(UC_X86_REG_RCX)
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rdx = mu.reg_read(UC_X86_REG_RDX)
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rsi = mu.reg_read(UC_X86_REG_RSI)
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rdi = mu.reg_read(UC_X86_REG_RDI)
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r8 = mu.reg_read(UC_X86_REG_R8)
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r9 = mu.reg_read(UC_X86_REG_R9)
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r10 = mu.reg_read(UC_X86_REG_R10)
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r11 = mu.reg_read(UC_X86_REG_R11)
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r12 = mu.reg_read(UC_X86_REG_R12)
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r13 = mu.reg_read(UC_X86_REG_R13)
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r14 = mu.reg_read(UC_X86_REG_R14)
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r15 = mu.reg_read(UC_X86_REG_R15)
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puts(">>> RAX = %d" % rax)
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puts(">>> RBX = %d" % rbx)
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puts(">>> RCX = %d" % rcx)
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puts(">>> RDX = %d" % rdx)
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|
puts(">>> RSI = %d" % rsi)
|
|
puts(">>> RDI = %d" % rdi)
|
|
puts(">>> R8 = %d" % r8)
|
|
puts(">>> R9 = %d" % r9)
|
|
puts(">>> R10 = %d" % r10)
|
|
puts(">>> R11 = %d" % r11)
|
|
puts(">>> R12 = %d" % r12)
|
|
puts(">>> R13 = %d" % r13)
|
|
puts(">>> R14 = %d" % r14)
|
|
puts(">>> R15 = %d" % r15)
|
|
#BUG
|
|
mu.emu_start(ADDRESS, ADDRESS + X86_CODE64.bytesize)
|
|
|
|
rescue UcError => e
|
|
puts("ERROR: %s" % e)
|
|
end
|
|
end
|
|
|
|
|
|
def test_x86_64_syscall()
|
|
puts("Emulate x86_64 code with 'syscall' instruction")
|
|
begin
|
|
# Initialize emulator in X86-64bit mode
|
|
mu = Uc.new UC_ARCH_X86, UC_MODE_64
|
|
|
|
# map 2MB memory for this emulation
|
|
mu.mem_map(ADDRESS, 2 * 1024 * 1024)
|
|
|
|
# write machine code to be emulated to memory
|
|
mu.mem_write(ADDRESS, X86_CODE64_SYSCALL)
|
|
|
|
hook_syscall = Proc.new do |mu, user_data|
|
|
rax = mu.reg_read(UC_X86_REG_RAX)
|
|
if rax == 0x100
|
|
mu.reg_write(UC_X86_REG_RAX, 0x200)
|
|
else
|
|
puts('ERROR: was not expecting rax=%d in syscall' % rax)
|
|
end
|
|
end
|
|
|
|
# hook interrupts for syscall
|
|
mu.hook_add(UC_HOOK_INSN, hook_syscall, nil, 1, 0, UC_X86_INS_SYSCALL)
|
|
|
|
# syscall handler is expecting rax=0x100
|
|
mu.reg_write(UC_X86_REG_RAX, 0x100)
|
|
|
|
begin
|
|
# emulate machine code in infinite time
|
|
mu.emu_start(ADDRESS, ADDRESS + X86_CODE64_SYSCALL.bytesize)
|
|
rescue UcError => e
|
|
puts("ERROR: %s" % e)
|
|
end
|
|
|
|
# now print out some registers
|
|
puts(">>> Emulation done. Below is the CPU context")
|
|
|
|
rax = mu.reg_read(UC_X86_REG_RAX)
|
|
puts(">>> RAX = 0x%x" % rax)
|
|
|
|
rescue UcError => e
|
|
puts("ERROR: %s" % e)
|
|
end
|
|
end
|
|
|
|
|
|
def test_x86_16()
|
|
puts("Emulate x86 16-bit code")
|
|
begin
|
|
# Initialize emulator in X86-16bit mode
|
|
mu = Uc.new UC_ARCH_X86, UC_MODE_16
|
|
|
|
# map 8KB memory for this emulation
|
|
mu.mem_map(0, 8 * 1024)
|
|
|
|
# set CPU registers
|
|
mu.reg_write(UC_X86_REG_EAX, 7)
|
|
mu.reg_write(UC_X86_REG_EBX, 5)
|
|
mu.reg_write(UC_X86_REG_ESI, 6)
|
|
|
|
# write machine code to be emulated to memory
|
|
mu.mem_write(0, X86_CODE16)
|
|
|
|
# emulate machine code in infinite time
|
|
mu.emu_start(0, X86_CODE16.bytesize)
|
|
|
|
# now print out some registers
|
|
puts(">>> Emulation done. Below is the CPU context")
|
|
|
|
tmp = mu.mem_read(11, 1)
|
|
puts("[0x%x] = 0x%x" % [11, tmp[0].ord])
|
|
|
|
rescue UcError => e
|
|
puts("ERROR: %s" % e)
|
|
end
|
|
end
|
|
|
|
|
|
test_i386()
|
|
puts("=" * 20)
|
|
test_i386_loop()
|
|
puts("=" * 20)
|
|
test_i386_invalid_mem_read()
|
|
puts("=" * 20)
|
|
test_i386_invalid_mem_write()
|
|
puts("=" * 20)
|
|
test_i386_context_save()
|
|
puts("=" * 20)
|
|
test_i386_inout()
|
|
puts("=" * 20)
|
|
test_x86_64()
|
|
puts("=" * 20)
|
|
test_x86_64_syscall()
|
|
puts("=" * 20)
|
|
test_x86_16()
|