├── LICENSE ├── README.md └── emu.py /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. By contrast, the GNU General Public 13 | License is intended to guarantee your freedom to share and change free 14 | software--to make sure the software is free for all its users. This 15 | General Public License applies to most of the Free Software 16 | Foundation's software and to any other program whose authors commit to 17 | using it. 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You may copy and distribute verbatim copies of the Program's 80 | source code as you receive it, in any medium, provided that you 81 | conspicuously and appropriately publish on each copy an appropriate 82 | copyright notice and disclaimer of warranty; keep intact all the 83 | notices that refer to this License and to the absence of any warranty; 84 | and give any other recipients of the Program a copy of this License 85 | along with the Program. 86 | 87 | You may charge a fee for the physical act of transferring a copy, and 88 | you may at your option offer warranty protection in exchange for a fee. 89 | 90 | 2. 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In such case, this License incorporates 235 | the limitation as if written in the body of this License. 236 | 237 | 9. The Free Software Foundation may publish revised and/or new versions 238 | of the General Public License from time to time. Such new versions will 239 | be similar in spirit to the present version, but may differ in detail to 240 | address new problems or concerns. 241 | 242 | Each version is given a distinguishing version number. If the Program 243 | specifies a version number of this License which applies to it and "any 244 | later version", you have the option of following the terms and conditions 245 | either of that version or of any later version published by the Free 246 | Software Foundation. If the Program does not specify a version number of 247 | this License, you may choose any version ever published by the Free Software 248 | Foundation. 249 | 250 | 10. If you wish to incorporate parts of the Program into other free 251 | programs whose distribution conditions are different, write to the author 252 | to ask for permission. For software which is copyrighted by the Free 253 | Software Foundation, write to the Free Software Foundation; we sometimes 254 | make exceptions for this. Our decision will be guided by the two goals 255 | of preserving the free status of all derivatives of our free software and 256 | of promoting the sharing and reuse of software generally. 257 | 258 | NO WARRANTY 259 | 260 | 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY 261 | FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN 262 | OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES 263 | PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED 264 | OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 265 | MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 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It is safest 289 | to attach them to the start of each source file to most effectively 290 | convey the exclusion of warranty; and each file should have at least 291 | the "copyright" line and a pointer to where the full notice is found. 292 | 293 | {description} 294 | Copyright (C) {year} {fullname} 295 | 296 | This program is free software; you can redistribute it and/or modify 297 | it under the terms of the GNU General Public License as published by 298 | the Free Software Foundation; either version 2 of the License, or 299 | (at your option) any later version. 300 | 301 | This program is distributed in the hope that it will be useful, 302 | but WITHOUT ANY WARRANTY; without even the implied warranty of 303 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 304 | GNU General Public License for more details. 305 | 306 | You should have received a copy of the GNU General Public License along 307 | with this program; if not, write to the Free Software Foundation, Inc., 308 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 309 | 310 | Also add information on how to contact you by electronic and paper mail. 311 | 312 | If the program is interactive, make it output a short notice like this 313 | when it starts in an interactive mode: 314 | 315 | Gnomovision version 69, Copyright (C) year name of author 316 | Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 317 | This is free software, and you are welcome to redistribute it 318 | under certain conditions; type `show c' for details. 319 | 320 | The hypothetical commands `show w' and `show c' should show the appropriate 321 | parts of the General Public License. Of course, the commands you use may 322 | be called something other than `show w' and `show c'; they could even be 323 | mouse-clicks or menu items--whatever suits your program. 324 | 325 | You should also get your employer (if you work as a programmer) or your 326 | school, if any, to sign a "copyright disclaimer" for the program, if 327 | necessary. Here is a sample; alter the names: 328 | 329 | Yoyodyne, Inc., hereby disclaims all copyright interest in the program 330 | `Gnomovision' (which makes passes at compilers) written by James Hacker. 331 | 332 | {signature of Ty Coon}, 1 April 1989 333 | Ty Coon, President of Vice 334 | 335 | This General Public License does not permit incorporating your program into 336 | proprietary programs. If your program is a subroutine library, you may 337 | consider it more useful to permit linking proprietary applications with the 338 | library. If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. 340 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # emu 2 | emu is a code emulator base on [unicorn engine](http://www.unicorn-engine.org/). 3 | 4 | It is inspired by [idaemu](https://github.com/36hours/idaemu) and made some modification. 5 | 6 | Supported architecture 7 | 8 | * X86 (16, 32, 64-bit) 9 | * ARM 10 | * ARM64 (ARMv8) 11 | 12 | ## features 13 | 14 | * automatic memory management 15 | * code tracing && memory access tracing 16 | * apis for human 17 | 18 | ## install 19 | [unicorn-engine](http://www.unicorn-engine.org/download/) 20 | 21 | hexdump (recommend) 22 | 23 | ## examples 24 | 25 | ``` 26 | from emu import * 27 | 28 | a = Emu(UC_ARCH_X86, UC_MODE_32) 29 | X86_CODE32 = b"\x41\x4a" # INC ecx; DEC edx 30 | base_address = 0x1000000 31 | a.setData(base_address, X86_CODE32) 32 | a.setReg(UC_X86_REG_ECX, 0x1234) 33 | a.setReg(UC_X86_REG_EDX, 0x7890) 34 | a.run(base_address, base_address + len(X86_CODE32), TimeOut=3) 35 | print(a.readReg(UC_X86_REG_ECX)) 36 | ``` 37 | 38 | ## contact 39 | 40 | md5_salt [AT] 0ops.net -------------------------------------------------------------------------------- /emu.py: -------------------------------------------------------------------------------- 1 | # author: md5_salt 2 | from __future__ import print_function 3 | from unicorn import * 4 | from unicorn.x86_const import * 5 | from unicorn.arm_const import * 6 | from unicorn.arm64_const import * 7 | from struct import unpack, pack, unpack_from, calcsize 8 | 9 | import binascii 10 | try: 11 | import hexdump 12 | except ImportError: 13 | pass 14 | 15 | PAGE_ALIGN = 0x1000 # 4k 16 | 17 | COMPILE_GCC = 1 18 | COMPILE_MSVC = 2 19 | 20 | TRACE_OFF = 0 21 | TRACE_DATA_READ = 1 22 | TRACE_DATA_WRITE = 2 23 | TRACE_CODE = 4 24 | 25 | 26 | class Emu(object): 27 | def __init__(self, arch, mode, compiler=COMPILE_GCC, stack=0xf000000, \ 28 | ssize=3): 29 | assert (arch in [UC_ARCH_X86, UC_ARCH_ARM, UC_ARCH_ARM64]) 30 | self.arch = arch 31 | self.mode = mode 32 | self.compiler = compiler 33 | self.stack = self._alignAddr(stack) 34 | self.mmaped = [] 35 | self.ssize = ssize 36 | self.curUC = None 37 | self.traceOption = TRACE_OFF 38 | self.logBuffer = [] 39 | self.altFunc = {} 40 | self.hooks = [] 41 | self.curUC = Uc(self.arch, self.mode) 42 | self.ignoreUnmappedRead = False 43 | self._init() 44 | 45 | def _initArgs(self, RA, args): 46 | sp = self.curUC.reg_read(self.REG_SP) 47 | if self.REG_RA == 0: 48 | self.curUC.mem_write(sp, pack(self.pack_fmt, RA)) 49 | else: 50 | self.curUC.reg_write(self.REG_RA, RA) 51 | 52 | ## init the arguments 53 | i = 0 54 | while i < len(self.REG_ARGS) and i < len(args): 55 | self.curUC.reg_write(self.REG_ARGS[i], args[i]) 56 | i += 1 57 | 58 | while i < len(args): 59 | sp += self.step 60 | self.curUC.mem_write(sp, pack(self.pack_fmt, args[i])) 61 | i += 1 62 | 63 | def malloc(self, address, length): 64 | addr = self._alignAddr(address) 65 | size = self._alignAddr(length) + PAGE_ALIGN 66 | 67 | for start, length in self.mmaped: 68 | if addr >= start and addr + size <= start + length: # already mmaped 69 | return 70 | elif addr < start and start < addr + size <= start + length: # left overlap 71 | nl = start - addr 72 | self.curUC.mem_map(addr, nl) 73 | self.mmaped.remove((start, length)) 74 | self.mmaped.append((addr, nl + length)) 75 | return 76 | elif addr >= start and addr + size > start + length > addr: # ritht overlap 77 | nl = (addr + size) - (start + length) 78 | self.curUC.mem_map(start + length, nl) 79 | self.mmaped.remove((start, length)) 80 | self.mmaped.append((start, nl + length)) 81 | return 82 | elif addr < start and addr + size > start + length: # both overlap 83 | nl1 = start - addr 84 | self.curUC.mem_map(addr, nl) 85 | nl2 = (addr + size) - (start + length) 86 | self.curUC.mem_map(start + length, nl) 87 | self.mmaped.remove((start, length)) 88 | self.mmaped.append((addr, size)) 89 | return 90 | self.curUC.mem_map(addr, size) 91 | self.mmaped.append((addr, size)) 92 | 93 | # set the data before emulation 94 | def setData(self, address, data): 95 | addr = self._alignAddr(address) 96 | self.malloc(addr, len(data)) 97 | self.curUC.mem_write(address, data) 98 | 99 | def readData(self, addr, size): 100 | return self.curUC.mem_read(addr, size) 101 | 102 | def setReg(self, reg, value): 103 | self.curUC.reg_write(reg, value) 104 | 105 | def readReg(self, reg): 106 | return self.curUC.reg_read(reg) 107 | 108 | def _getBit(self, value, offset): 109 | mask = 1 << offset 110 | return 1 if (value & mask) > 0 else 0 111 | 112 | def _clearHooks(self): 113 | for h in self.hooks: 114 | self.curUC.hook_del(h) 115 | 116 | def run(self, startAddr, stopAddr, args=[], TimeOut=0, Count=0): 117 | try: 118 | self._clearHooks() 119 | self._initArgs(stopAddr, args) 120 | self.logBuffer = [] 121 | 122 | # add the invalid memory access hook 123 | self.hooks.append(self.curUC.hook_add(UC_HOOK_MEM_READ_UNMAPPED | UC_HOOK_MEM_WRITE_UNMAPPED | UC_HOOK_MEM_FETCH_UNMAPPED, self._hook_mem_invalid)) 124 | 125 | # add the trace hook 126 | if self.traceOption & (TRACE_DATA_READ | TRACE_DATA_WRITE): 127 | self.hooks.append(self.curUC.hook_add(UC_HOOK_MEM_READ | UC_HOOK_MEM_WRITE, self._hook_mem_access)) 128 | 129 | self.hooks.append(self.curUC.hook_add(UC_HOOK_CODE, self._hook_code)) 130 | 131 | # start emulate 132 | self.curUC.emu_start(startAddr, stopAddr, timeout=TimeOut, count=Count) 133 | except UcError as e: 134 | print("#ERROR: %s" % e) 135 | 136 | def setTrace(self, opt): 137 | if opt != TRACE_OFF: 138 | self.traceOption |= opt 139 | else: 140 | self.traceOption = TRACE_OFF 141 | 142 | def _addTrace(self, logInfo): 143 | self.logBuffer.append(logInfo) 144 | 145 | def showTrace(self): 146 | logs = "\n".join(self.logBuffer) 147 | print(logs) 148 | 149 | def alt(self, address, func, argc, balance=False): 150 | """ 151 | If call the address, will call the func instead. 152 | the arguments of func : func(self.curUC, consoleouput, args) 153 | """ 154 | assert (callable(func)) 155 | self.altFunc[address] = (func, argc, balance) 156 | 157 | def dumpData(self, addr, size): 158 | data = str(self.readData(addr, size)) 159 | try: 160 | hexdump.hexdump(data) 161 | except: 162 | for i in range(0, size, 4): 163 | if i % 16 == 0: print("") 164 | print(binascii.hexlify(data[i:i+4]), end=' ') 165 | 166 | def showMaps(self): 167 | for address, size in self.mmaped: 168 | print('%s-%s\t%s'%(hex(address), hex(address+size), hex(size))) 169 | 170 | # callback for tracing invalid memory access (READ or WRITE, FETCH) 171 | def _hook_mem_invalid(self, uc, access, address, size, value, user_data): 172 | if access == UC_MEM_WRITE_UNMAPPED: 173 | addr = self._alignAddr(address) 174 | self.malloc(addr, PAGE_ALIGN) 175 | return True 176 | elif access == UC_MEM_READ_UNMAPPED and self.ignoreUnmappedRead: 177 | print("#WARNING: Read unmaped address %s" % hex(address)) 178 | addr = self._alignAddr(address) 179 | self.malloc(addr, PAGE_ALIGN) 180 | return True 181 | 182 | def _hook_mem_access(self, uc, access, address, size, value, user_data): 183 | if access == UC_MEM_WRITE and self.traceOption & TRACE_DATA_WRITE: 184 | self._addTrace("### Memory WRITE at 0x%x, data size = %u, data value = 0x%x" \ 185 | % (address, size, value)) 186 | elif access == UC_MEM_READ and self.traceOption & TRACE_DATA_READ: 187 | self._addTrace("### Memory READ at 0x%x, data size = %u" \ 188 | % (address, size)) 189 | 190 | def _hook_code(self, uc, address, size, user_data): 191 | if self.traceOption & TRACE_CODE: 192 | self._addTrace("### Trace Instruction at 0x%x, size = %u" % (address, size)) 193 | if address in self.altFunc.keys(): 194 | func, argc, balance = self.altFunc[address] 195 | try: 196 | sp = uc.reg_read(self.REG_SP) 197 | if self.REG_RA == 0: 198 | RA = unpack(self.pack_fmt, str(uc.mem_read(sp, self.step)))[0] 199 | sp += self.step 200 | else: 201 | RA = uc.reg_read(self.REG_RA) 202 | 203 | args = [] 204 | i = 0 205 | while i < argc and i < len(self.REG_ARGS): 206 | args.append(uc.reg_read(self.REG_ARGS[i])) 207 | i += 1 208 | sp2 = sp 209 | while i < argc: 210 | args.append(unpack(self.pack_fmt, str(uc.mem_read(sp2, self.step)))[0]) 211 | sp2 += self.step 212 | i += 1 213 | 214 | res = func(uc, self.logBuffer, args) 215 | if type(res) != int: res = 0 216 | uc.reg_write(self.REG_RES, res) 217 | uc.reg_write(self.REG_PC, RA) 218 | if balance: 219 | uc.reg_write(self.REG_SP, sp2) 220 | else: 221 | uc.reg_write(self.REG_SP, sp) 222 | except Exception as e: 223 | self._addTrace("alt exception: %s" % e) 224 | 225 | def _alignAddr(self, addr): 226 | #return addr 227 | return addr // PAGE_ALIGN * PAGE_ALIGN 228 | 229 | def showRegs(self, *regs): 230 | for reg in regs: 231 | print("0x%x" % self.curUC.reg_read(reg)) 232 | 233 | def _init(self): 234 | if self.arch == UC_ARCH_X86: 235 | if self.mode == UC_MODE_16: 236 | self.step = 2 237 | self.pack_fmt = '>> regs:") 292 | eflags = None 293 | try: 294 | if self.arch == UC_ARCH_X86: 295 | if self.mode == UC_MODE_16: 296 | ax = self.curUC.reg_read(UC_X86_REG_AX) 297 | bx = self.curUC.reg_read(UC_X86_REG_BX) 298 | cx = self.curUC.reg_read(UC_X86_REG_CX) 299 | dx = self.curUC.reg_read(UC_X86_REG_DX) 300 | di = self.curUC.reg_read(UC_X86_REG_SI) 301 | si = self.curUC.reg_read(UC_X86_REG_DI) 302 | bp = self.curUC.reg_read(UC_X86_REG_BP) 303 | sp = self.curUC.reg_read(UC_X86_REG_SP) 304 | ip = self.curUC.reg_read(UC_X86_REG_IP) 305 | eflags = self.curUC.reg_read(UC_X86_REG_EFLAGS) 306 | 307 | print(" AX = 0x%x BX = 0x%x CX = 0x%x DX = 0x%x" % (ax, bx, cx, dx)) 308 | print(" DI = 0x%x SI = 0x%x BP = 0x%x SP = 0x%x" % (di, si, bp, sp)) 309 | print(" IP = 0x%x" % ip) 310 | elif self.mode == UC_MODE_32: 311 | eax = self.curUC.reg_read(UC_X86_REG_EAX) 312 | ebx = self.curUC.reg_read(UC_X86_REG_EBX) 313 | ecx = self.curUC.reg_read(UC_X86_REG_ECX) 314 | edx = self.curUC.reg_read(UC_X86_REG_EDX) 315 | edi = self.curUC.reg_read(UC_X86_REG_ESI) 316 | esi = self.curUC.reg_read(UC_X86_REG_EDI) 317 | ebp = self.curUC.reg_read(UC_X86_REG_EBP) 318 | esp = self.curUC.reg_read(UC_X86_REG_ESP) 319 | eip = self.curUC.reg_read(UC_X86_REG_EIP) 320 | eflags = self.curUC.reg_read(UC_X86_REG_EFLAGS) 321 | 322 | print(" EAX = 0x%x EBX = 0x%x ECX = 0x%x EDX = 0x%x" % (eax, ebx, ecx, edx)) 323 | print(" EDI = 0x%x ESI = 0x%x EBP = 0x%x ESP = 0x%x" % (edi, esi, ebp, esp)) 324 | print(" EIP = 0x%x" % eip) 325 | elif self.mode == UC_MODE_64: 326 | rax = self.curUC.reg_read(UC_X86_REG_RAX) 327 | rbx = self.curUC.reg_read(UC_X86_REG_RBX) 328 | rcx = self.curUC.reg_read(UC_X86_REG_RCX) 329 | rdx = self.curUC.reg_read(UC_X86_REG_RDX) 330 | rdi = self.curUC.reg_read(UC_X86_REG_RSI) 331 | rsi = self.curUC.reg_read(UC_X86_REG_RDI) 332 | rbp = self.curUC.reg_read(UC_X86_REG_RBP) 333 | rsp = self.curUC.reg_read(UC_X86_REG_RSP) 334 | rip = self.curUC.reg_read(UC_X86_REG_RIP) 335 | r8 = self.curUC.reg_read(UC_X86_REG_R8) 336 | r9 = self.curUC.reg_read(UC_X86_REG_R9) 337 | r10 = self.curUC.reg_read(UC_X86_REG_R10) 338 | r11 = self.curUC.reg_read(UC_X86_REG_R11) 339 | r12 = self.curUC.reg_read(UC_X86_REG_R12) 340 | r13 = self.curUC.reg_read(UC_X86_REG_R13) 341 | r14 = self.curUC.reg_read(UC_X86_REG_R14) 342 | r15 = self.curUC.reg_read(UC_X86_REG_R15) 343 | eflags = self.curUC.reg_read(UC_X86_REG_EFLAGS) 344 | 345 | print(" RAX = 0x%x RBX = 0x%x RCX = 0x%x RDX = 0x%x" % (rax, rbx, rcx, rdx)) 346 | print(" RDI = 0x%x RSI = 0x%x RBP = 0x%x RSP = 0x%x" % (rdi, rsi, rbp, rsp)) 347 | print(" R8 = 0x%x R9 = 0x%x R10 = 0x%x R11 = 0x%x R12 = 0x%x " \ 348 | "R13 = 0x%x R14 = 0x%x R15 = 0x%x" % (r8, r9, r10, r11, r12, r13, r14, r15)) 349 | print(" RIP = 0x%x" % rip) 350 | if eflags: 351 | print(" EFLAGS:") 352 | print(" CF=%d PF=%d AF=%d ZF=%d SF=%d TF=%d IF=%d DF=%d OF=%d IOPL=%d " \ 353 | "NT=%d RF=%d VM=%d AC=%d VIF=%d VIP=%d ID=%d" 354 | % (self._getBit(eflags, 0), 355 | self._getBit(eflags, 2), 356 | self._getBit(eflags, 4), 357 | self._getBit(eflags, 6), 358 | self._getBit(eflags, 7), 359 | self._getBit(eflags, 8), 360 | self._getBit(eflags, 9), 361 | self._getBit(eflags, 10), 362 | self._getBit(eflags, 11), 363 | self._getBit(eflags, 12) + self._getBit(eflags, 13) * 2, 364 | self._getBit(eflags, 14), 365 | self._getBit(eflags, 16), 366 | self._getBit(eflags, 17), 367 | self._getBit(eflags, 18), 368 | self._getBit(eflags, 19), 369 | self._getBit(eflags, 20), 370 | self._getBit(eflags, 21))) 371 | if self.arch == UC_ARCH_ARM: 372 | if self.mode == UC_MODE_ARM: 373 | r0 = self.curUC.reg_read(UC_ARM_REG_R0) 374 | r1 = self.curUC.reg_read(UC_ARM_REG_R1) 375 | r2 = self.curUC.reg_read(UC_ARM_REG_R2) 376 | r3 = self.curUC.reg_read(UC_ARM_REG_R3) 377 | r4 = self.curUC.reg_read(UC_ARM_REG_R4) 378 | r5 = self.curUC.reg_read(UC_ARM_REG_R5) 379 | r6 = self.curUC.reg_read(UC_ARM_REG_R6) 380 | r7 = self.curUC.reg_read(UC_ARM_REG_R7) 381 | r8 = self.curUC.reg_read(UC_ARM_REG_R8) 382 | r9 = self.curUC.reg_read(UC_ARM_REG_R9) 383 | r10 = self.curUC.reg_read(UC_ARM_REG_R10) 384 | r11 = self.curUC.reg_read(UC_ARM_REG_R11) 385 | r12 = self.curUC.reg_read(UC_ARM_REG_R12) 386 | r13 = self.curUC.reg_read(UC_ARM_REG_R13) 387 | r14 = self.curUC.reg_read(UC_ARM_REG_R14) 388 | r15 = self.curUC.reg_read(UC_ARM_REG_R15) 389 | cpsr = self.curUC.reg_read(UC_ARM_REG_CPSR) 390 | fp = r11 391 | sp = r13 392 | lr = r14 393 | pc = r15 394 | print(" R0 = 0x%x R1 = 0x%x R2 = 0x%x R3 = 0x%x" % (r0, r1, r2, r3)) 395 | print(" R4 = 0x%x R5 = 0x%x R6 = 0x%x R7 = 0x%x" % (r4, r5, r6, r7)) 396 | print(" R8 = 0x%x R9 = 0x%x R10 = 0x%x R11 = 0x%x" % (r8, r9, r10, r11)) 397 | print(" R12 = 0x%x R13 = 0x%x R14 = 0x%x R15 = 0x%x" % (r12, r13, r14, r15)) 398 | print(" FP = 0x%x SP = 0x%x LR = 0x%x PC = 0x%x" % (fp, sp, lr, pc)) 399 | print(" CPSR:") 400 | print(" N = %d Z = %d C = %d V = %d" 401 | % ( self._getBit(cpsr, 31), 402 | self._getBit(cpsr, 30), 403 | self._getBit(cpsr, 29), 404 | self._getBit(cpsr, 28) ) ) 405 | except UcError as e: 406 | print("#ERROR: %s" % e) 407 | --------------------------------------------------------------------------------