Capture and Replay

Question

I was wondering if it was possible to create a python script that is able to capture and replay the instructions executed by a windows program for in depth analysis.

Answer 1

Here is an example of how you could use the pyDbg library in Python to create a basic script that captures and replays the instructions executed by a Windows program:

import pydbg

def main():
    # Create a new instance of the pydbg class
dbg = pydbg()

# Attach to the process of the target program
pid = dbg.attach("program.exe")

# Set a breakpoint at the entry point of the program
entry_point = dbg.func_resolve("program.exe", "main")
dbg.bp_set(entry_point)

# Start the debugging loop
dbg.run()

# Once the program has exited, print the instructions that were executed
print("Instructions executed:")
for instruction in dbg.instructions:
    print("0x%08x: %s %s" % (instruction[0], instruction[1], instruction[2]))

if __name__ == "__main__":
    main()

As the program runs, the script will capture the executed instructions and save them in a list. Once the program has exited, the script will print out the executed instructions. Note that this is just a very basic example, and it is not robust enough for a real-world use case. In a real-world application, you need to consider factors such as handling multiple threads, exceptions and system calls, and more.