mias (cea-sec/miasm)

mias (cea-sec/miasm) | MoltPulse

>>> from miasm.arch.x86.arch import mn_x86
>>> from miasm.core.locationdb import LocationDB

>>> loc_db = LocationDB()

>>> l = mn_x86.fromstring('XOR ECX, ECX', loc_db, 32)
>>> print(l)
XOR        ECX, ECX
>>> mn_x86.asm(l)
['1\xc9', '3\xc9', 'g1\xc9', 'g3\xc9']

>>> l.args[0] = mn_x86.regs.EAX
>>> print(l)
XOR        EAX, ECX
>>> a = mn_x86.asm(l)
>>> print(a)
['1\xc8', '3\xc1', 'g1\xc8', 'g3\xc1']

>>> print(mn_x86.dis(a[0], 32))
XOR        EAX, ECX

>>> from miasm.analysis.machine import Machine
>>> mn = Machine('x86_32').mn
>>> print(mn.dis('\x33\x30', 32))
XOR        ESI, DWORD PTR [EAX]

>>> mn = Machine('mips32b').mn
>>> print(mn.dis(b'\x97\xa3\x00 ', "b"))
LHU        V1, 0x20(SP)

>>> machine = Machine('arml')
>>> instr = machine.mn.dis('\x00 \x88\xe0', 'l')
>>> print(instr)
ADD        R2, R8, R0

>>> lifter = machine.lifter_model_call(loc_db)

>>> ircfg = lifter.new_ircfg()

>>> lifter.add_instr_to_ircfg(instr, ircfg)

>>> for lbl, irblock in ircfg.blocks.items():
...     print(irblock)
loc_0:
R2 = R8 + R0

IRDst = loc_4

>>> for lbl, irblock in ircfg.blocks.items():
...     for assignblk in irblock:
...         rw = assignblk.get_rw()
...         for dst, reads in rw.items():
...             print('read:   ', [str(x) for x in reads])
...             print('written:', dst)
...             print()
...
read:    ['R8', 'R0']
written: R2

read:    []
written: IRDst

00000000 8d4904      lea    ecx, [ecx+0x4]
00000003 8d5b01      lea    ebx, [ebx+0x1]
00000006 80f901      cmp    cl, 0x1
00000009 7405        jz     0x10
0000000b 8d5bff      lea    ebx, [ebx-1]
0000000e eb03        jmp    0x13
00000010 8d5b01      lea    ebx, [ebx+0x1]
00000013 89d8        mov    eax, ebx
00000015 c3          ret
>>> s = b'\x8dI\x04\x8d[\x01\x80\xf9\x01t\x05\x8d[\xff\xeb\x03\x8d[\x01\x89\xd8\xc3'

>>> from miasm.analysis.binary import Container
>>> c = Container.from_string(s, loc_db)
>>> c
<miasm.analysis.binary.ContainerUnknown object at 0x7f34cefe6090>

>>> from miasm.analysis.machine import Machine
>>> machine = Machine('x86_32')
>>> mdis = machine.dis_engine(c.bin_stream, loc_db=loc_db)
>>> asmcfg = mdis.dis_multiblock(0)
>>> for block in asmcfg.blocks:
...  print(block)
...
loc_0
LEA        ECX, DWORD PTR [ECX + 0x4]
LEA        EBX, DWORD PTR [EBX + 0x1]
CMP        CL, 0x1
JZ         loc_10
->      c_next:loc_b    c_to:loc_10
loc_10
LEA        EBX, DWORD PTR [EBX + 0x1]
->      c_next:loc_13
loc_b
LEA        EBX, DWORD PTR [EBX + 0xFFFFFFFF]
JMP        loc_13
->      c_to:loc_13
loc_13
MOV        EAX, EBX
RET

>>> jitter = machine.jitter(loc_db, jit_type='python')
>>> jitter.init_stack()

>>> run_addr = 0x40000000
>>> from miasm.jitter.csts import PAGE_READ, PAGE_WRITE
>>> jitter.vm.add_memory_page(run_addr, PAGE_READ | PAGE_WRITE, s)

def code_sentinelle(jitter):
    jitter.running = False
    jitter.pc = 0
    return True

>>> jitter.add_breakpoint(0x1337beef, code_sentinelle)
>>> jitter.push_uint32_t(0x1337beef)

>>> jitter.set_trace_log()

>>> jitter.init_run(run_addr)
>>> jitter.continue_run()
RAX 0000000000000000 RBX 0000000000000000 RCX 0000000000000000 RDX 0000000000000000
RSI 0000000000000000 RDI 0000000000000000 RSP 000000000123FFF8 RBP 0000000000000000
zf 0000000000000000 nf 0000000000000000 of 0000000000000000 cf 0000000000000000
RIP 0000000040000000
40000000 LEA        ECX, DWORD PTR [ECX+0x4]
RAX 0000000000000000 RBX 0000000000000000 RCX 0000000000000004 RDX 0000000000000000
RSI 0000000000000000 RDI 0000000000000000 RSP 000000000123FFF8 RBP 0000000000000000
zf 0000000000000000 nf 0000000000000000 of 0000000000000000 cf 0000000000000000
....
4000000e JMP        loc_0000000040000013:0x40000013
RAX 0000000000000000 RBX 0000000000000000 RCX 0000000000000004 RDX 0000000000000000
RSI 0000000000000000 RDI 0000000000000000 RSP 000000000123FFF8 RBP 0000000000000000
zf 0000000000000000 nf 0000000000000000 of 0000000000000000 cf 0000000000000000
RIP 0000000040000013
40000013 MOV        EAX, EBX
RAX 0000000000000000 RBX 0000000000000000 RCX 0000000000000004 RDX 0000000000000000
RSI 0000000000000000 RDI 0000000000000000 RSP 000000000123FFF8 RBP 0000000000000000
zf 0000000000000000 nf 0000000000000000 of 0000000000000000 cf 0000000000000000
RIP 0000000040000013
40000015 RET
>>>

>>> jitter.vm
ad 1230000 size 10000 RW_ hpad 0x2854b40
ad 40000000 size 16 RW_ hpad 0x25e0ed0

>>> hex(jitter.cpu.EAX)
'0x0L'
>>> jitter.cpu.ESI = 12

>>> lifter = machine.lifter_model_call(loc_db)
>>> ircfg = lifter.new_ircfg_from_asmcfg(asmcfg)

>>> from miasm.ir.symbexec import SymbolicExecutionEngine
>>> sb = SymbolicExecutionEngine(lifter)

>>> symbolic_pc = sb.run_at(ircfg, 0)
>>> print(symbolic_pc)
((ECX + 0x4)[0:8] + 0xFF)?(0xB,0x10)

>>> sb = SymbolicExecutionEngine(lifter, machine.mn.regs.regs_init)
>>> symbolic_pc = sb.run_at(ircfg, 0, step=True)
Instr LEA        ECX, DWORD PTR [ECX + 0x4]
Assignblk:
ECX = ECX + 0x4
________________________________________________________________________________
ECX                = ECX + 0x4
________________________________________________________________________________
Instr LEA        EBX, DWORD PTR [EBX + 0x1]
Assignblk:
EBX = EBX + 0x1
________________________________________________________________________________
EBX                = EBX + 0x1
ECX                = ECX + 0x4
________________________________________________________________________________
Instr CMP        CL, 0x1
Assignblk:
zf = (ECX[0:8] + -0x1)?(0x0,0x1)
nf = (ECX[0:8] + -0x1)[7:8]
pf = parity((ECX[0:8] + -0x1) & 0xFF)
of = ((ECX[0:8] ^ (ECX[0:8] + -0x1)) & (ECX[0:8] ^ 0x1))[7:8]
cf = (((ECX[0:8] ^ 0x1) ^ (ECX[0:8] + -0x1)) ^ ((ECX[0:8] ^ (ECX[0:8] + -0x1)) & (ECX[0:8] ^ 0x1)))[7:8]
af = ((ECX[0:8] ^ 0x1) ^ (ECX[0:8] + -0x1))[4:5]
________________________________________________________________________________
af                 = (((ECX + 0x4)[0:8] + 0xFF) ^ (ECX + 0x4)[0:8] ^ 0x1)[4:5]
pf                 = parity((ECX + 0x4)[0:8] + 0xFF)
zf                 = ((ECX + 0x4)[0:8] + 0xFF)?(0x0,0x1)
ECX                = ECX + 0x4
of                 = ((((ECX + 0x4)[0:8] + 0xFF) ^ (ECX + 0x4)[0:8]) & ((ECX + 0x4)[0:8] ^ 0x1))[7:8]
nf                 = ((ECX + 0x4)[0:8] + 0xFF)[7:8]
cf                 = (((((ECX + 0x4)[0:8] + 0xFF) ^ (ECX + 0x4)[0:8]) & ((ECX + 0x4)[0:8] ^ 0x1)) ^ ((ECX + 0x4)[0:8] + 0xFF) ^ (ECX + 0x4)[0:8] ^ 0x1)[7:8]
EBX                = EBX + 0x1
________________________________________________________________________________
Instr JZ         loc_key_1
Assignblk:
IRDst = zf?(loc_key_1,loc_key_2)
EIP = zf?(loc_key_1,loc_key_2)
________________________________________________________________________________
af                 = (((ECX + 0x4)[0:8] + 0xFF) ^ (ECX + 0x4)[0:8] ^ 0x1)[4:5]
EIP                = ((ECX + 0x4)[0:8] + 0xFF)?(0xB,0x10)
pf                 = parity((ECX + 0x4)[0:8] + 0xFF)
IRDst              = ((ECX + 0x4)[0:8] + 0xFF)?(0xB,0x10)
zf                 = ((ECX + 0x4)[0:8] + 0xFF)?(0x0,0x1)
ECX                = ECX + 0x4
of                 = ((((ECX + 0x4)[0:8] + 0xFF) ^ (ECX + 0x4)[0:8]) & ((ECX + 0x4)[0:8] ^ 0x1))[7:8]
nf                 = ((ECX + 0x4)[0:8] + 0xFF)[7:8]
cf                 = (((((ECX + 0x4)[0:8] + 0xFF) ^ (ECX + 0x4)[0:8]) & ((ECX + 0x4)[0:8] ^ 0x1)) ^ ((ECX + 0x4)[0:8] + 0xFF) ^ (ECX + 0x4)[0:8] ^ 0x1)[7:8]
EBX                = EBX + 0x1
________________________________________________________________________________
>>>

>>> from miasm.expression.expression import ExprInt
>>> sb.symbols[machine.mn.regs.ECX] = ExprInt(-3, 32)
>>> symbolic_pc = sb.run_at(ircfg, 0, step=True)
Instr LEA        ECX, DWORD PTR [ECX + 0x4]
Assignblk:
ECX = ECX + 0x4
________________________________________________________________________________
af                 = (((ECX + 0x4)[0:8] + 0xFF) ^ (ECX + 0x4)[0:8] ^ 0x1)[4:5]
EIP                = ((ECX + 0x4)[0:8] + 0xFF)?(0xB,0x10)
pf                 = parity((ECX + 0x4)[0:8] + 0xFF)
IRDst              = ((ECX + 0x4)[0:8] + 0xFF)?(0xB,0x10)
zf                 = ((ECX + 0x4)[0:8] + 0xFF)?(0x0,0x1)
ECX                = 0x1
of                 = ((((ECX + 0x4)[0:8] + 0xFF) ^ (ECX + 0x4)[0:8]) & ((ECX + 0x4)[0:8] ^ 0x1))[7:8]
nf                 = ((ECX + 0x4)[0:8] + 0xFF)[7:8]
cf                 = (((((ECX + 0x4)[0:8] + 0xFF) ^ (ECX + 0x4)[0:8]) & ((ECX + 0x4)[0:8] ^ 0x1)) ^ ((ECX + 0x4)[0:8] + 0xFF) ^ (ECX + 0x4)[0:8] ^ 0x1)[7:8]
EBX                = EBX + 0x1
________________________________________________________________________________
Instr LEA        EBX, DWORD PTR [EBX + 0x1]
Assignblk:
EBX = EBX + 0x1
________________________________________________________________________________
af                 = (((ECX + 0x4)[0:8] + 0xFF) ^ (ECX + 0x4)[0:8] ^ 0x1)[4:5]
EIP                = ((ECX + 0x4)[0:8] + 0xFF)?(0xB,0x10)
pf                 = parity((ECX + 0x4)[0:8] + 0xFF)
IRDst              = ((ECX + 0x4)[0:8] + 0xFF)?(0xB,0x10)
zf                 = ((ECX + 0x4)[0:8] + 0xFF)?(0x0,0x1)
ECX                = 0x1
of                 = ((((ECX + 0x4)[0:8] + 0xFF) ^ (ECX + 0x4)[0:8]) & ((ECX + 0x4)[0:8] ^ 0x1))[7:8]
nf                 = ((ECX + 0x4)[0:8] + 0xFF)[7:8]
cf                 = (((((ECX + 0x4)[0:8] + 0xFF) ^ (ECX + 0x4)[0:8]) & ((ECX + 0x4)[0:8] ^ 0x1)) ^ ((ECX + 0x4)[0:8] + 0xFF) ^ (ECX + 0x4)[0:8] ^ 0x1)[7:8]
EBX                = EBX + 0x2
________________________________________________________________________________
Instr CMP        CL, 0x1
Assignblk:
zf = (ECX[0:8] + -0x1)?(0x0,0x1)
nf = (ECX[0:8] + -0x1)[7:8]
pf = parity((ECX[0:8] + -0x1) & 0xFF)
of = ((ECX[0:8] ^ (ECX[0:8] + -0x1)) & (ECX[0:8] ^ 0x1))[7:8]
cf = (((ECX[0:8] ^ 0x1) ^ (ECX[0:8] + -0x1)) ^ ((ECX[0:8] ^ (ECX[0:8] + -0x1)) & (ECX[0:8] ^ 0x1)))[7:8]
af = ((ECX[0:8] ^ 0x1) ^ (ECX[0:8] + -0x1))[4:5]
________________________________________________________________________________
af                 = 0x0
EIP                = ((ECX + 0x4)[0:8] + 0xFF)?(0xB,0x10)
pf                 = 0x1
IRDst              = ((ECX + 0x4)[0:8] + 0xFF)?(0xB,0x10)
zf                 = 0x1
ECX                = 0x1
of                 = 0x0
nf                 = 0x0
cf                 = 0x0
EBX                = EBX + 0x2
________________________________________________________________________________
Instr JZ         loc_key_1
Assignblk:
IRDst = zf?(loc_key_1,loc_key_2)
EIP = zf?(loc_key_1,loc_key_2)
________________________________________________________________________________
af                 = 0x0
EIP                = 0x10
pf                 = 0x1
IRDst              = 0x10
zf                 = 0x1
ECX                = 0x1
of                 = 0x0
nf                 = 0x0
cf                 = 0x0
EBX                = EBX + 0x2
________________________________________________________________________________
Instr LEA        EBX, DWORD PTR [EBX + 0x1]
Assignblk:
EBX = EBX + 0x1
________________________________________________________________________________
af                 = 0x0
EIP                = 0x10
pf                 = 0x1
IRDst              = 0x10
zf                 = 0x1
ECX                = 0x1
of                 = 0x0
nf                 = 0x0
cf                 = 0x0
EBX                = EBX + 0x3
________________________________________________________________________________
Instr LEA        EBX, DWORD PTR [EBX + 0x1]
Assignblk:
IRDst = loc_key_3
________________________________________________________________________________
af                 = 0x0
EIP                = 0x10
pf                 = 0x1
IRDst              = 0x13
zf                 = 0x1
ECX                = 0x1
of                 = 0x0
nf                 = 0x0
cf                 = 0x0
EBX                = EBX + 0x3
________________________________________________________________________________
Instr MOV        EAX, EBX
Assignblk:
EAX = EBX
________________________________________________________________________________
af                 = 0x0
EIP                = 0x10
pf                 = 0x1
IRDst              = 0x13
zf                 = 0x1
ECX                = 0x1
of                 = 0x0
nf                 = 0x0
cf                 = 0x0
EBX                = EBX + 0x3
EAX                = EBX + 0x3
________________________________________________________________________________
Instr RET
Assignblk:
IRDst = @32[ESP[0:32]]
ESP = {ESP[0:32] + 0x4 0 32}
EIP = @32[ESP[0:32]]
________________________________________________________________________________
af                 = 0x0
EIP                = @32[ESP]
pf                 = 0x1
IRDst              = @32[ESP]
zf                 = 0x1
ECX                = 0x1
of                 = 0x0
nf                 = 0x0
cf                 = 0x0
EBX                = EBX + 0x3
ESP                = ESP + 0x4
EAX                = EBX + 0x3
________________________________________________________________________________
>>>

$ cd miasm_directory
$ python -m pip install .

$ python -m pip install '.[cparser,z3,llvm]'
$ python -m pip install '.[all]'
$ python -m pip install --group dev '.[all]'  # local development/test runs

uv sync --extra all
# or: python -m pip install --group dev '.[all]'
cd miasm_directory/test

# Run tests using our own test runner
python test_all.py

# Run tests using standard frameworks (slower, require 'parameterized')
python -m unittest test_all.py        # sequential, requires 'unittest'
python -m pytest test_all.py          # sequential, requires 'pytest'
python -m pytest -n auto test_all.py  # parallel, requires 'pytest' and 'pytest-xdist'

mias

MoltPulse

What is Miasm?

Table of Contents

Basic examples

Assembling / Disassembling

Intermediate representation

Emulation

Symbolic execution

How does it work?

Documentation

Obtaining Miasm

Software requirements

Configuration

Windows & IDA

Testing

They already use Miasm

Tools

Blog posts / papers / conferences

Books

Ecosystem Role

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