def main():
global dse, todo, current
sys.setrecursionlimit(2000) # oof
# Parse arguments
parser = Sandbox_Win_x86_64.parser(description="PE sandboxer")
parser.add_argument("filename", help="PE Filename")
options = parser.parse_args()
options.dependencies = True # So we dont need to reimplement qt
sb = Sandbox_Win_x86_64(LocationDB(),
options.filename,
options,
custom_methods=qt_methods)
sb.jitter.add_breakpoint(end_ptr, stop_exec) # End condition
# Setup the qt string memory and a pointer to it
sb.jitter.vm.add_memory_page(0x10000018, PAGE_READ | PAGE_WRITE,
pck64(0x20000000)) # Hooking in here
sb.jitter.vm.add_memory_page(0x20000000, PAGE_READ | PAGE_WRITE,
qtstring) # The initial qstring
sb.jitter.vm.add_memory_page(0x10000020, PAGE_READ | PAGE_WRITE,
b'\x00') # The result
sb.jitter.cpu.R15 = 0x10000000
sb.jitter.cpu.RSP = sb.jitter.stack_base + 0x8000
# Setup and attach the DSE
dse = DSEPC(sb.machine,
sb.loc_db,
produce_solution=DSEPC.PRODUCE_SOLUTION_PATH_COV)
sb.jitter.init_run(0x140004B61)
dse.attach(sb.jitter)
dse.update_state_from_concrete()
dse.symbolize_memory(interval([(flag_ptr, flag_ptr + 0x20)]))
# Printable unicode only
for address in range(flag_ptr, flag_ptr + 0x20, 0x2):
z3_mem = dse.z3_trans.from_expr(
dse.eval_expr(ExprMem(ExprInt(address, 64), 16)))
unicode_constraint = z3.And( \
z3.UGE(z3_mem, dse.z3_trans.from_expr(ExprInt(0x0020, 16))), \
z3.ULE(z3_mem, dse.z3_trans.from_expr(ExprInt(0x007E, 16))) \
)
dse.cur_solver.add(unicode_constraint)
snapshot = dse.take_snapshot()
# Begin run
todo = [b'\x41\x00' * 0x10]
while todo:
dse.restore_snapshot(snapshot)
current = todo.pop()
sb.jitter.vm.set_mem(flag_ptr,
current) # Update the password in jitter memory
print('-' * 40 + f' CONCRETE: {unicode_string(current)}')
sb.jitter.continue_run()
dse = DSEPathConstraint(machine, loc_db, produce_solution=strategy)
dse.attach(jitter)
# Concretize everything except the argument
dse.update_state_from_concrete()
regs = jitter.lifter.arch.regs
arg = ExprId("ARG", 32)
arg_addr = ExprMem(ExprInt(jitter.cpu.ESP + 4, regs.ESP.size), arg.size)
dse.update_state({
# @[ESP + 4] = ARG
arg_addr: arg
})
# Explore solutions
todo = set([ExprInt(0, arg.size)])
done = set()
snapshot = dse.take_snapshot()
# Only needed for the final output
reaches = set()
while todo:
# Get the next candidate
arg_value = todo.pop()
# Avoid using twice the same input
if arg_value in done:
continue
done.add(arg_value)
print("Run with ARG = %s" % arg_value)
# Restore state, while keeping already found solutions
# })
# - Generic:
dse.update_state_from_concrete()
# Add constraint on file size, we don't want to generate too big FILE
z3_file_size = dse.z3_trans.from_expr(FILE_size)
dse.cur_solver.add(0 < z3_file_size)
dse.cur_solver.add(z3_file_size < 0x10)
# Register symbolic stubs for extern functions (xxx_puts_symb, ...)
dse.add_lib_handler(sb.libs, globals())
# Automatic exploration of solution
## Save the current clean state, before any computation of the FILE content
snapshot = dse.take_snapshot()
found = False
while todo:
# Prepare a solution to try, based on the clean state
file_content = todo.pop()
print("CUR: %r" % file_content)
open(TEMP_FILE.name, "wb").write(file_content)
dse.restore_snapshot(snapshot, keep_known_solutions=True)
FILE_to_info.clear()
FILE_to_info_symb.clear()
# Play the current file
try:
sb.run()
except FinishOn as finish_info: