├── .gitignore ├── AsmExec.py ├── AsmGen.py ├── AsmGen32.py ├── AsmGen64.py ├── Examples ├── x64 │ └── ArgPrintf.asm └── x86 │ ├── EntryPoint.asm │ ├── Printf.asm │ └── RetArg.asm ├── ExecBuffWin.py ├── LICENSE ├── PyASM.py ├── README.md └── Utils.py /.gitignore: -------------------------------------------------------------------------------- 1 | # Byte-compiled / optimized / DLL files 2 | __pycache__/ 3 | *.py[cod] 4 | *$py.class 5 | 6 | # C extensions 7 | *.so 8 | 9 | # Distribution / packaging 10 | .Python 11 | build/ 12 | develop-eggs/ 13 | dist/ 14 | downloads/ 15 | eggs/ 16 | .eggs/ 17 | lib/ 18 | lib64/ 19 | parts/ 20 | sdist/ 21 | var/ 22 | wheels/ 23 | *.egg-info/ 24 | .installed.cfg 25 | *.egg 26 | MANIFEST 27 | 28 | # PyInstaller 29 | # Usually these files are written by a python script from a template 30 | # before PyInstaller builds the exe, so as to inject date/other infos into it. 31 | *.manifest 32 | *.spec 33 | 34 | # Installer logs 35 | pip-log.txt 36 | pip-delete-this-directory.txt 37 | 38 | # Unit test / coverage reports 39 | htmlcov/ 40 | .tox/ 41 | .coverage 42 | .coverage.* 43 | .cache 44 | nosetests.xml 45 | coverage.xml 46 | *.cover 47 | .hypothesis/ 48 | .pytest_cache/ 49 | 50 | # Translations 51 | *.mo 52 | *.pot 53 | 54 | # Django stuff: 55 | *.log 56 | local_settings.py 57 | db.sqlite3 58 | 59 | # Flask stuff: 60 | instance/ 61 | .webassets-cache 62 | 63 | # Scrapy stuff: 64 | .scrapy 65 | 66 | # Sphinx documentation 67 | docs/_build/ 68 | 69 | # PyBuilder 70 | target/ 71 | 72 | # Jupyter Notebook 73 | .ipynb_checkpoints 74 | 75 | # pyenv 76 | .python-version 77 | 78 | # celery beat schedule file 79 | celerybeat-schedule 80 | 81 | # SageMath parsed files 82 | *.sage.py 83 | 84 | # Environments 85 | .env 86 | .venv 87 | env/ 88 | venv/ 89 | ENV/ 90 | env.bak/ 91 | venv.bak/ 92 | 93 | # Spyder project settings 94 | .spyderproject 95 | .spyproject 96 | 97 | # Rope project settings 98 | .ropeproject 99 | 100 | # mkdocs documentation 101 | /site 102 | 103 | # mypy 104 | .mypy_cache/ 105 | -------------------------------------------------------------------------------- /AsmExec.py: -------------------------------------------------------------------------------- 1 | import ctypes 2 | 3 | from ExecBuffWin import gen_executable_func 4 | from Utils import get_platform_pointer_size_bits 5 | 6 | if get_platform_pointer_size_bits() == 64: 7 | from AsmGen64 import wrap_64_asm as wrap_asm, assemble, validate_asm 8 | else: 9 | from AsmGen32 import wrap_32_asm as wrap_asm, assemble, validate_asm 10 | 11 | 12 | def transform_arg(arg): 13 | arg = arg.strip() 14 | if arg.startswith('0x'): 15 | return int(arg, 16) 16 | 17 | if arg.startswith('0b'): 18 | return int(arg, 1) 19 | 20 | return int(arg, 10) 21 | 22 | 23 | def prepare_asm(asm_lines, argnum, entry_point=None): 24 | if type(asm_lines) in (str, unicode): 25 | asm_lines = asm_lines.splitlines() 26 | 27 | print "[+] Assembling the ASM code" 28 | assert validate_asm(asm_lines), "ASM seems invalid!" 29 | asm_bytes = assemble(wrap_asm(asm_lines, zero_arg_regs=False, zero_gp_regs=True, entry_point=entry_point)) 30 | print "[+] Preparing code for execution" 31 | return gen_executable_func(asm_bytes, args_num=argnum) 32 | 33 | 34 | def run_asm_func(asm_func, *args): 35 | print "[+] Running the ASM code (ptr to code is at: {})".format(hex(ctypes.addressof(asm_func))) 36 | ret_val = hex(asm_func(*args)) 37 | print "[+] ASM code returned {}".format(ret_val) 38 | return ret_val 39 | 40 | 41 | def run_asm(asm_lines, entry_point, *args): 42 | args = [transform_arg(a) for a in args] 43 | 44 | asm_func = prepare_asm(asm_lines, len(args), entry_point) 45 | run_asm_func(asm_func, *args) 46 | 47 | 48 | def read_asm_interactive(funcs, fname): 49 | asm_lines = [] 50 | 51 | print "Enter ASM code line by line (enter two consecutive new lines to finish):" 52 | print " " 53 | 54 | while len(asm_lines) < 2 or asm_lines[-1] != "" and asm_lines[-2] != "": 55 | line = raw_input('') 56 | asm_lines.append(line.strip()) 57 | 58 | if not fname: 59 | fname = 'f_{}'.format(len(funcs)) 60 | 61 | funcs[fname] = (prepare_asm(asm_lines, 0), asm_lines, 0) 62 | 63 | print "Your code is now the function {F}. To see it's contents, use 'print {F}'. " \ 64 | "To execute it, use {F}()".format(F=fname) 65 | 66 | 67 | def do_interactive(): 68 | print """ 69 | No file argument was given, so switching to interactive mode. 70 | 71 | Type help to see what you can do :-) 72 | 73 | """ 74 | funcs = {} 75 | 76 | while True: 77 | try: 78 | command_line = raw_input('>> ').strip() 79 | 80 | if command_line.startswith('exit'): 81 | return 82 | 83 | elif command_line.startswith('help'): 84 | print """ 85 | You are in interactive mode. This is what you can do here: 86 | >> help - Show this screen 87 | >> new [${name}] - Will let you enter a new asm func [with the chosen name, if given] 88 | >> print funcs - Will show you all existing function names 89 | >> print ${func_name} - Print asm contents of the requested function 90 | >> ${func_name}(args) - Will execute the given function with the given args 91 | >> exit - Will let you out of here 92 | 93 | """ 94 | 95 | elif command_line.startswith('new') or command_line.startswith('asm'): 96 | name = None 97 | if len(command_line.split()) > 1: 98 | name = command_line.split()[1] 99 | 100 | read_asm_interactive(funcs, name) 101 | 102 | elif command_line.startswith('print'): 103 | if command_line == 'print funcs': 104 | print funcs 105 | else: 106 | name = command_line.split()[-1] 107 | print name, funcs[name][1], "expected args: ", funcs[name][2] 108 | 109 | elif '(' in command_line: 110 | func_name, args_l = command_line.split('(') 111 | args = [a for a in args_l[:-1].split(',') if a] 112 | 113 | nargs = funcs[func_name][2] 114 | if len(args) > nargs: 115 | correct_nargs = len(args) 116 | print "Seems like {} has more args than expected. Adjusting args accordingly".format(func_name) 117 | func_lines = funcs[func_name][1] 118 | funcs[func_name] = (prepare_asm(func_lines, correct_nargs), func_lines, correct_nargs) 119 | 120 | run_asm_func(funcs[func_name][0], *[transform_arg(a) for a in args]) 121 | 122 | else: 123 | print 'Unknown command "{}". Use help to see what you can do'.format(command_line) 124 | 125 | except Exception as e: 126 | print repr(e) 127 | 128 | 129 | 130 | -------------------------------------------------------------------------------- /AsmGen.py: -------------------------------------------------------------------------------- 1 | import re 2 | import ctypes 3 | from keystone import * 4 | 5 | ctypes_strs = [] 6 | 7 | 8 | def gen_c_string(text): 9 | str_obj = ctypes.create_string_buffer(text.replace('\\n', '\n')) 10 | 11 | # Prevent the GC from killing our string 12 | ctypes_strs.append(str_obj) 13 | 14 | return ctypes.addressof(str_obj) 15 | 16 | 17 | def asm_entry_exit_fix(asm_lines, entry_point): 18 | asm_lines = [line.strip() for line in asm_lines if line.strip()] 19 | 20 | ret_line = None 21 | if entry_point: 22 | # The function will be executed from the beginning of the block, 23 | # so we want to put our prefix, and then jump to the entry point 24 | asm_lines = ['jmp {}'.format(entry_point)] + asm_lines 25 | 26 | entry_point_found = False 27 | for i, line in enumerate(asm_lines): 28 | if entry_point in line and line.endswith(':'): 29 | entry_point_found = True 30 | 31 | if not entry_point_found: 32 | continue 33 | 34 | if line == 'ret' and entry_point_found: 35 | ret_line = i 36 | 37 | else: 38 | # If there is no entry point, the last ret is the one we want to replace with 'jmp .end' 39 | ret_line = len(asm_lines)-1 40 | 41 | if ret_line and asm_lines[ret_line] == 'ret': 42 | asm_lines = asm_lines[:ret_line] + ["jmp .end"] + asm_lines[ret_line:] 43 | 44 | return asm_lines 45 | 46 | 47 | def _transform_asm(asm_lines, call_direct_boilerplate, wrapped_call_boilerplate, debug_func): 48 | clean_lines = [] 49 | for line in asm_lines: 50 | line = line.split('//')[0] 51 | line = line.split('#')[0] 52 | line = line.strip() 53 | if not line: 54 | continue 55 | 56 | # TODO: This should support a list 57 | if line == 'debug' or re.match('call.?\s+[!]?debug', line): 58 | # Pseudo call to debug 59 | line = call_direct_boilerplate.format(debug_func) 60 | 61 | if '"' in line: 62 | # Generate a string object, and change the string literal to the pointer to it 63 | assert len(line.split('"')) == 3 64 | string_literal = line.split('"')[1] 65 | line = line.replace('"{}"'.format(string_literal), '{}'.format(gen_c_string(string_literal))) 66 | 67 | if line.strip().startswith('call') and '!' in line: 68 | # Pseudo call to ctype function 69 | pseudo_call_site = line.split('!')[1].split(' ')[0] 70 | 71 | if '.' not in pseudo_call_site: 72 | pseudo_call_site = 'msvcrt.' + pseudo_call_site 73 | 74 | dll, funcname = pseudo_call_site.split('.') 75 | ctypes_dll = getattr(ctypes.cdll, dll) 76 | ctypes_dll_funcs = [f for f in dir(ctypes_dll) if '_' not in f] 77 | if funcname not in ctypes_dll_funcs: 78 | raise Exception('Could not find {} in ctypes.cdll.{}. Options are: {}'.format(funcname, dll, ctypes_dll_funcs)) 79 | 80 | func_addr = ctypes.addressof(getattr(ctypes_dll, funcname)) 81 | line = wrapped_call_boilerplate.format(func_addr) 82 | 83 | clean_lines.append(line) 84 | 85 | return clean_lines 86 | 87 | 88 | def validate_asm_imp(asm_lines, assembler): 89 | # Due to a keystone bug, it won't raise an error if there is an invalid line followed by a valid one. 90 | # To solve this, we will try to ASM line by line. 91 | # Obviously, we can't trust missing label errors in this case, so we will simply test location exceptions ourselves 92 | 93 | asm_lines = _transform_asm(asm_lines, "", "", "") 94 | 95 | for line in asm_lines: 96 | line = line.split('//')[0] 97 | line = line.split('#')[0] 98 | 99 | try: 100 | assembler.asm(line) 101 | except keystone.KsError as e: 102 | # import pdb; pdb.set_trace() 103 | if e.message == 'Cannot find a symbol (KS_ERR_ASM_SYMBOL_MISSING)': 104 | symbol = line.split()[e.stat_count] 105 | assert re.search(symbol + '\s*' + ':', '\n'.join(asm_lines)), "Could not find symbol {} in ASM lines!".format(symbol) 106 | else: 107 | print "ASM error of type", repr(e), "on line ", line 108 | print "Maybe the error is at '{}'".format(line.split()[e.stat_count]) 109 | return False 110 | 111 | return True 112 | 113 | 114 | def assemble_imp(asm_lines, assembler, call_direct_boilerplate, wrapped_call_boilerplate, debug_func): 115 | lines = _transform_asm(asm_lines, call_direct_boilerplate, wrapped_call_boilerplate, debug_func) 116 | 117 | # print '\n'.join(lines) 118 | 119 | try: 120 | opcodes = assembler.asm('\n'.join(lines))[0] 121 | except keystone.KsError: 122 | print "Error assembling the code! Trying line by line, hopefully this will help spot the issue:" 123 | for l in lines: 124 | print l 125 | assembler.asm(l) 126 | return 127 | 128 | return ''.join([chr(c) for c in opcodes]) 129 | -------------------------------------------------------------------------------- /AsmGen32.py: -------------------------------------------------------------------------------- 1 | import ctypes 2 | 3 | from keystone import * 4 | 5 | from AsmGen import assemble_imp, validate_asm_imp, ctypes_strs, asm_entry_exit_fix 6 | 7 | from ExecBuffWin import alloc_executable_buff_windows 8 | from Utils import get_platform_pointer_size_bits, Hex 9 | 10 | 11 | assert get_platform_pointer_size_bits() == 32, "This module should only be imported for x86 32 bit envs" 12 | 13 | ASSEMBLER_X86 = Ks(KS_ARCH_X86, KS_MODE_32) 14 | 15 | DEBUG_FUNC = None 16 | 17 | 18 | msvcrt = ctypes.cdll.msvcrt 19 | printf = msvcrt.printf 20 | fflush = msvcrt.fflush 21 | 22 | 23 | PUSHA = """ 24 | push eax 25 | push ecx 26 | push edx 27 | push ebx 28 | push ebx 29 | push ebp 30 | push esi 31 | push edi 32 | """ 33 | 34 | POPA = """ 35 | pop edi 36 | pop esi 37 | pop ebp 38 | pop ebx 39 | pop ebx 40 | pop edx 41 | pop ecx 42 | pop eax 43 | """ 44 | 45 | POPA_NO_EAX = """ 46 | pop edi 47 | pop esi 48 | pop ebp 49 | pop ebx 50 | pop ebx 51 | pop edx 52 | pop ecx 53 | add esp, 4 # Instead of popping eax 54 | """ 55 | 56 | 57 | CALL_DIRECT = """ 58 | push eax 59 | mov eax, {} 60 | call eax 61 | pop eax 62 | """ 63 | 64 | CALL_W = """ 65 | mov eax, {} 66 | mov eax, dword ptr [eax] 67 | call eax 68 | """ 69 | 70 | 71 | STACK_MOVE_OFFSET = 0x1000 72 | 73 | FFLUSH = """ 74 | pusha 75 | push 0 76 | call !fflush 77 | add esp, 4 78 | popa 79 | """.format(FFLUSH_PTR_PTR=ctypes.addressof(fflush)) 80 | 81 | 82 | def validate_asm(asm_lines): 83 | return validate_asm_imp(asm_lines, ASSEMBLER_X86) 84 | 85 | 86 | def assemble(asm_lines): 87 | return assemble_imp(asm_lines, ASSEMBLER_X86, CALL_DIRECT, CALL_W, DEBUG_FUNC) 88 | 89 | 90 | def wrap_32_asm(asm_lines, zero_gp_regs=True, zero_arg_regs=False, entry_point=None): 91 | asm_lines = asm_entry_exit_fix(asm_lines, entry_point) 92 | 93 | PREFIX = """ 94 | sub esp, {STACK_MOVE_OFFSET} 95 | {PUSHA} 96 | add esp, {STACK_MOVE_OFFSET_PLUS_REG_SIZE} 97 | """.format(PUSHA=PUSHA, STACK_MOVE_OFFSET=Hex(STACK_MOVE_OFFSET), 98 | STACK_MOVE_OFFSET_PLUS_REG_SIZE=Hex(STACK_MOVE_OFFSET + 99 | len([l for l in PUSHA.splitlines() if l.strip()] * 4))).splitlines() 100 | 101 | if zero_gp_regs: 102 | PREFIX += """ 103 | mov eax, 0 104 | mov ebx, 0 105 | mov ecx, 0 106 | mov edx, 0 107 | mov edi, 0 108 | mov esi, 0 109 | """.splitlines() 110 | 111 | if zero_arg_regs: 112 | print "'zero_arg_regs' should not be used for x86, as it doesn't make any sense" 113 | 114 | SUFFIX = """ 115 | .end_dubug: 116 | pusha 117 | push "Done running, dumping register state:\\n" 118 | call !msvcrt.printf 119 | add esp, 4 120 | popa 121 | 122 | debug 123 | 124 | .end: 125 | sub esp, {STACK_MOVE_OFFSET_PLUS_REG_SIZE} 126 | {POPA_NO_EAX} 127 | add esp, {STACK_MOVE_OFFSET} 128 | ret 129 | """.format(POPA_NO_EAX=POPA_NO_EAX, STACK_MOVE_OFFSET=Hex(STACK_MOVE_OFFSET), 130 | STACK_MOVE_OFFSET_PLUS_REG_SIZE=Hex(STACK_MOVE_OFFSET + 131 | len([l for l in PUSHA.splitlines() if l.strip()] * 4))).splitlines() 132 | 133 | return PREFIX + asm_lines + SUFFIX 134 | 135 | 136 | def gen_debug_asm(): 137 | gp_reg_pairs = [('eax', 'ebx'), ('ecx', 'edx'), ('edi', 'esi'), ('ebp', 'esp')] 138 | 139 | debug_asm = [] 140 | for r1, r2 in gp_reg_pairs: 141 | format_str = ctypes.create_string_buffer('{}: 0x%x {}: 0x%x\n'.format(r1, r2)) 142 | 143 | # We must do this to prevent the GC from freeing the c_str and causing cool bugs :-) 144 | ctypes_strs.append(format_str) 145 | 146 | debug_asm += """ 147 | {FFLUSH} # call fflush 148 | pusha 149 | 150 | push {ARG2} # Load arg2 151 | push {ARG1} # Load arg1 152 | push {STR_PTR} # format string 153 | 154 | mov eax, {PRINTF_PTR_PTR} # pointer to printf 155 | mov eax, dword ptr [eax] # printf addr 156 | 157 | call eax # call printf 158 | add esp, 0xc # Fix stack 159 | 160 | popa 161 | {FFLUSH} # call fflush 162 | """.format(PUSHA=PUSHA, POPA=POPA, 163 | STR_PTR=ctypes.addressof(format_str), 164 | ARG1=r1, ARG2=r2, 165 | FFLUSH=FFLUSH, 166 | PRINTF_PTR_PTR=ctypes.addressof(printf)).splitlines() 167 | 168 | debug_asm += ['ret'] 169 | 170 | return alloc_executable_buff_windows(assemble(debug_asm)) 171 | 172 | 173 | DEBUG_FUNC = gen_debug_asm() 174 | 175 | 176 | -------------------------------------------------------------------------------- /AsmGen64.py: -------------------------------------------------------------------------------- 1 | import ctypes 2 | 3 | from keystone import * 4 | 5 | from AsmGen import assemble_imp, validate_asm_imp, ctypes_strs, asm_entry_exit_fix 6 | from ExecBuffWin import alloc_executable_buff_windows 7 | from Utils import get_platform_pointer_size_bits 8 | 9 | 10 | assert get_platform_pointer_size_bits() == 64, "This module should only be imported for 64 bit envs" 11 | 12 | ASSEMBLER_X64 = Ks(KS_ARCH_X86, KS_MODE_64) 13 | 14 | DEBUG_FUNC = None 15 | 16 | msvcrt = ctypes.cdll.msvcrt 17 | printf = msvcrt.printf 18 | fflush = msvcrt.fflush 19 | 20 | 21 | PUSHAQ = """ 22 | push rax 23 | push rcx 24 | push rdx 25 | push rbx 26 | push rbp 27 | push rsi 28 | push rdi 29 | """ 30 | 31 | POPAQ = """ 32 | pop rdi 33 | pop rsi 34 | pop rbp 35 | pop rbx 36 | pop rdx 37 | pop rcx 38 | pop rax 39 | """ 40 | 41 | POPAQ_NO_EAX = """ 42 | pop rdi 43 | pop rsi 44 | pop rbp 45 | pop rbx 46 | pop rdx 47 | pop rcx 48 | add rsp, 8 # Instead of popping eax 49 | """ 50 | 51 | PUSHRS = """ 52 | push r8 53 | push r9 54 | push r10 55 | push r11 56 | push r12 57 | push r13 58 | push r14 59 | push r15 60 | """ 61 | 62 | POPRS = """ 63 | pop r15 64 | pop r14 65 | pop r13 66 | pop r12 67 | pop r11 68 | pop r10 69 | pop r9 70 | pop r8 71 | """ 72 | 73 | CALL_DIRECT = """ 74 | push r15 75 | mov r15, {} 76 | call r15 77 | pop r15 78 | """ 79 | 80 | CALL_W = """ 81 | mov r15, {} 82 | call call_w 83 | """ 84 | 85 | FFLUSH = """ 86 | push rax 87 | push rbx 88 | push rcx 89 | 90 | sub rsp, 16 91 | mov rcx, 0 # flush all 92 | mov rbx, {FFLUSH_PTR_PTR} # Pointer to fflush 93 | mov rbx, qword ptr [rbx] # fflush addr 94 | call rbx # Call fflush 95 | add rsp, 16 96 | 97 | pop rcx 98 | pop rbx 99 | pop rax 100 | """.format(FFLUSH_PTR_PTR=ctypes.addressof(fflush)) 101 | 102 | 103 | def validate_asm(asm_lines): 104 | return validate_asm_imp(asm_lines, ASSEMBLER_X64) 105 | 106 | 107 | def assemble(asm_lines): 108 | return assemble_imp(asm_lines, ASSEMBLER_X64, CALL_DIRECT, CALL_W, DEBUG_FUNC) 109 | 110 | 111 | def gen_debug_asm(): 112 | reg_pairs = [('rax', 'rbx'), ('rcx', 'rdx'), ('rdi', 'rsi')] 113 | reg_pairs_rs = [('r8', 'r9'), ('r10', 'r11'), ('r12', 'r13'), ('r14', 'r15'), ('rsp', 'rip')] 114 | 115 | debug_asm = [] 116 | for r1, r2 in reg_pairs + reg_pairs_rs: 117 | format_str = ctypes.create_string_buffer('{}: 0x%x {}: 0x%x\n'.format(r1, r2)) 118 | 119 | # We must do this to prevent the GC from freeing the c_str and causing cool bugs :-) 120 | ctypes_strs.append(format_str) 121 | 122 | debug_asm += """ 123 | {PUSHRS} 124 | {PUSHAQ} 125 | {FFLUSH} # call fflush 126 | 127 | mov rax, {ARG1} # Load arg1 128 | mov r8, {ARG2} # Load arg2 129 | 130 | mov rcx, {STR_PTR} # format string 131 | mov rbx, {PRINTF_PTR_PTR} # pointer to printf 132 | mov rbx, qword ptr [rbx] # printf addr 133 | 134 | 135 | push rax 136 | push rbx 137 | push rcx 138 | mov rdx, rax 139 | call rbx # call printf 140 | pop rcx 141 | pop rbx 142 | pop rax 143 | 144 | {FFLUSH} # call fflush 145 | 146 | {POPAQ} 147 | {POPRS} 148 | """.format(PUSHAQ=PUSHAQ, POPAQ=POPAQ, PUSHRS=PUSHRS, POPRS=POPRS, 149 | STR_PTR=ctypes.addressof(format_str), 150 | ARG1=r1, ARG2=r2, 151 | FFLUSH=FFLUSH, 152 | PRINTF_PTR_PTR=ctypes.addressof(printf)).splitlines() 153 | 154 | debug_asm += ['ret'] 155 | 156 | return alloc_executable_buff_windows(assemble(debug_asm)) 157 | 158 | 159 | def wrap_64_asm(asm_lines, zero_gp_regs=True, zero_arg_regs=False, entry_point=None): 160 | asm_lines = asm_entry_exit_fix(asm_lines, entry_point) 161 | 162 | PREFIX = """ 163 | {PUSHAQ} 164 | {PUSHRS} 165 | """.format(PUSHAQ=PUSHAQ, PUSHRS=PUSHRS).splitlines() 166 | 167 | if zero_gp_regs: 168 | PREFIX += """ 169 | mov rax, 0 170 | mov rbx, 0 171 | mov rdi, 0 172 | mov r10, 0 173 | mov r11, 0 174 | mov r12, 0 175 | mov r13, 0 176 | mov r14, 0 177 | """.splitlines() 178 | 179 | if zero_arg_regs: 180 | PREFIX += """ 181 | mov rcx, 0 182 | mov rdx, 0 183 | mov r8, 0 184 | mov r9, 0 185 | """.splitlines() 186 | 187 | SUFFIX = """ 188 | .end_dubug: 189 | push rax 190 | push rcx 191 | mov rcx, "Done running, dumping register state:\\n" 192 | call !msvcrt.printf 193 | pop rcx 194 | pop rax 195 | 196 | debug 197 | 198 | .end: 199 | {POPRS} 200 | {POPAQ_NO_EAX} 201 | ret 202 | 203 | 204 | """.format(POPRS=POPRS, POPAQ_NO_EAX=POPAQ_NO_EAX).splitlines() 205 | 206 | PRE_DEF_FUNCS = """ 207 | # Call the function whose pointer is stored where r15 points to 208 | # Return value is in rax. 209 | # All other registers are restored 210 | call_w: 211 | {PUSHAQ} 212 | {PUSHRS} 213 | push r15 214 | sub rsp, 32 215 | mov r15, qword ptr [r15] 216 | call r15 217 | add rsp, 32 218 | pop r15 219 | {POPRS} 220 | {POPAQ_NO_EAX} 221 | ret 222 | """.format(PUSHAQ=PUSHAQ, POPAQ_NO_EAX=POPAQ_NO_EAX, POPRS=POPRS, PUSHRS=PUSHRS).splitlines() 223 | 224 | return PREFIX + asm_lines + SUFFIX + PRE_DEF_FUNCS 225 | 226 | 227 | DEBUG_FUNC = gen_debug_asm() 228 | 229 | 230 | -------------------------------------------------------------------------------- /Examples/x64/ArgPrintf.asm: -------------------------------------------------------------------------------- 1 | xchg rcx, rdx # Move arg1 to edx 2 | 3 | mov rcx, "%d\n" 4 | call !msvcrt.printf 5 | mov rcx, 0 6 | call !msvcrt.fflush 7 | 8 | call !debug 9 | ret -------------------------------------------------------------------------------- /Examples/x86/EntryPoint.asm: -------------------------------------------------------------------------------- 1 | 2 | # This function will only work if the entry point is set to main 3 | # If set to f, it will crash python (since python will not know where it ends and how to fix the stack) 4 | 5 | f: 6 | mov eax, 0x10 7 | ret 8 | 9 | main: 10 | call f 11 | add eax, 0x20 12 | ret -------------------------------------------------------------------------------- /Examples/x86/Printf.asm: -------------------------------------------------------------------------------- 1 | 2 | 3 | start: 4 | push "Hello world\n" 5 | call !msvcrt.printf 6 | add esp, 4 7 | 8 | push 0xcafefefe 9 | push "%x\n" 10 | 11 | call !msvcrt.printf 12 | add esp, 8 13 | 14 | push 0 15 | call !msvcrt.fflush 16 | add esp, 4 17 | 18 | ret -------------------------------------------------------------------------------- /Examples/x86/RetArg.asm: -------------------------------------------------------------------------------- 1 | mov eax, [esp+4] 2 | 3 | debug 4 | 5 | ret 6 | -------------------------------------------------------------------------------- /ExecBuffWin.py: -------------------------------------------------------------------------------- 1 | import os 2 | import ctypes 3 | 4 | MEM_COMMIT = 0x00001000 5 | MEM_RESERVE = 0x00002000 6 | 7 | PAGE_EXECUTE_READ = 0x20 8 | PAGE_EXECUTE_READWRITE = 0x40 9 | 10 | 11 | def alloc_executable_buff_windows(buff): 12 | assert os.name == 'nt', 'This method will only work on windows platforms' 13 | 14 | """Return a pointer to a page-aligned executable buffer filled in with the data of the string provided. 15 | The pointer should be freed with libc.free() when finished""" 16 | 17 | VirtualAlloc = ctypes.windll.kernel32.VirtualAlloc 18 | VirtualProtect = ctypes.windll.kernel32.VirtualProtect 19 | RtlMoveMemory = ctypes.windll.kernel32.RtlMoveMemory 20 | 21 | shellcode = bytearray(buff) 22 | 23 | mem_buff = VirtualAlloc(ctypes.c_int(0), 24 | ctypes.c_int(len(shellcode)), 25 | ctypes.c_int(MEM_COMMIT | MEM_RESERVE), 26 | ctypes.c_int(0x40)) 27 | 28 | c_buf = (ctypes.c_char * len(shellcode)).from_buffer(shellcode) 29 | old = ctypes.c_long(1) 30 | VirtualProtect(mem_buff, ctypes.c_int(len(shellcode)), PAGE_EXECUTE_READWRITE, ctypes.byref(old)) 31 | RtlMoveMemory(ctypes.c_int(mem_buff), c_buf, ctypes.c_int(len(shellcode))) 32 | 33 | return mem_buff 34 | 35 | 36 | def func_ptr_from_mem(mem_buff, ctype_args=None): 37 | func = ctypes.cast(mem_buff, ctypes.CFUNCTYPE(ctypes.c_void_p)) 38 | func.restype = ctypes.c_int 39 | 40 | if ctype_args: 41 | func.argtypes = ctype_args 42 | return func 43 | 44 | 45 | def gen_executable_func(asm_bytes, args_num=0): 46 | exec_buff = alloc_executable_buff_windows(asm_bytes) 47 | 48 | ctype_args = None 49 | if args_num: 50 | ctype_args = [ctypes.c_int for _ in range(args_num)] 51 | 52 | return func_ptr_from_mem(exec_buff, ctype_args) 53 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /PyASM.py: -------------------------------------------------------------------------------- 1 | import sys 2 | import argparse 3 | from argparse import RawTextHelpFormatter 4 | from AsmExec import do_interactive, run_asm 5 | 6 | # TODO: Create git repo and upload to github 7 | 8 | 9 | # TODO: Add linux support 10 | # TODO: Check what ctypes.cdll has for linux 11 | 12 | 13 | DESCRIPTION = """ 14 | Play with ASM from python. 15 | 16 | This program will assemble your ASM lines, create an executable buffer, and run your code. 17 | 18 | Execution will start from the first assembly line, unless a start label is specifically given in the 'entry_point' arg. 19 | 20 | I added some convenience 'cheat' functions. You can call these using 'call !funcname' . 21 | Use --magic-funcs to see a list of available functions. 22 | 23 | In addition, you can allocate and get a reference to a string by simply using 'mov reg, "str"'. 24 | 25 | See the example ASM dir for examples of all this. 26 | 27 | """ 28 | 29 | 30 | def print_magic_help(): 31 | print """ 32 | You can call magic function at any point using 'call !func' (notice the bang before the function's name). 33 | 34 | These function are either built-in function by me, or function exported by ctyptes.cdll . 35 | 36 | To call cdll functions, you should use 'call !dllname.dllfunc' for instance, calling printf is 'call !msvcrt.printf' 37 | Don't forget the calling convention is probably cdecl in these cases. 38 | 39 | Available built-in funcs are: 40 | - void debug(void) - Will use printf to dump the register state at the given point 41 | 42 | 43 | You can find available cdll funcs by iterating over ctypes.cdll (for instance, try dir(ctypes.cdll.msvcrt) 44 | """ 45 | 46 | 47 | def main(): 48 | # Check for keystone installation: 49 | try: 50 | import keystone 51 | except ImportError: 52 | raise Exception("Keystone is required for assembling text. " 53 | "You can get it from here: " 54 | "http://www.keystone-engine.org/download/#python-module-for-windows---binaries--") 55 | 56 | parser = argparse.ArgumentParser(description=DESCRIPTION, formatter_class=RawTextHelpFormatter) 57 | 58 | parser.add_argument('-f', '--file', default=None, 59 | help='File containing ASM text to run') 60 | 61 | parser.add_argument('-e', '--entry-point', default=None, 62 | help='Label to start execution from. ' 63 | 'Note: If you use an entry point, make sure the first ret after that label is where the program ends. ' 64 | 'Otherwise python will crash on return') 65 | 66 | parser.add_argument('--magic-funcs', action='store_true', 67 | help='Print help about using magic functions and exists') 68 | 69 | parser.add_argument('-a', '--asm-args', nargs='+', default=[], 70 | help='Arguments to pass to the assembly function') 71 | 72 | args = parser.parse_args() 73 | 74 | if args.magic_funcs: 75 | print_magic_help() 76 | sys.exit(0) 77 | 78 | if args.file: 79 | run_asm(open(args.file, 'r').readlines(), args.entry_point, *args.asm_args) 80 | else: 81 | do_interactive() 82 | 83 | 84 | if __name__ == '__main__': 85 | main() 86 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # PyASM 2 | Fiddle with x86 and x64 asm from python. 3 | 4 | This project simply assembles the given code with keystone, calls VirtualProtect on the buffer, and lets you execute it. 5 | 6 | Currently only work on Windows {x86, x64}. 7 | 8 | # But why? 9 | Because I can. 10 | 11 | # Seriously, why not just use a real assembler? or gcc's \_\_asm\_\_? 12 | There is no really good answer here. 13 | If you are comfortable with gcc's inline asm, or like using your favorite assembler - go ahead! 14 | 15 | I personally find it very convenient to be able to simply type in some asm line, add some printf magic, and call the buffer with arguments. 16 | Especially if I want to script the arguments (hence the python). 17 | 18 | Also, sometimes you just need to execute that friggin buffer. From python. 19 | 20 | -------------------------------------------------------------------------------- /Utils.py: -------------------------------------------------------------------------------- 1 | import struct 2 | 3 | 4 | def get_platform_pointer_size_bits(): 5 | return struct.calcsize("P") * 8 6 | 7 | 8 | def Hex(n): 9 | return hex(n).replace('L', '') 10 | --------------------------------------------------------------------------------