The idea is that you don't want to fill the memory chunk with real data from the server but keep the contents that happen to be in there from previous allocatio

The idea is that you don't want to fill the memory chunk with real data from the server but keep the contents that happen to be in there from previous allocations. Then when the proxy later retrieves the contents of the memory chunk they get essentially a random block of old heap contents. Thats valuable because those will contain (vtable) pointers that reveal where in memory the game was loaded - most executables nowadays use ASLR so a prerequisite to an exploit is having some sort of information leak like this that can tell you the base address.