How does the mona plugin in Immunity Debugger assist in bypassing DEP with VirtualAlloc?

The mona plugin automatically generates a ROP chain that sets up the registers for a VirtualAlloc call with executable permissions. It produces ready-to-use gadget addresses and a chain that can be directly copied into the exploit shellcode, simplifying the process of disabling DEP. The plugin also outputs alternative chains for different scenarios, as shown in the article's `rop_chains.txt` example.