I wonder if Perl, Python, or Ruby can be used to write a program so that it will look for 0x12345678 in the memory of another process (probably the heap, for both data and c
There are ways to do do this using Process injection, delay load library etc.
I don't see you doing it from the tools you have listed. This is C and assembler country and beginning to get you into virus writing territory. Once you get it to work, any anti-virus packages will veto it running and try and isolate it. So you better really want to do this.
"With power comes much ...."
Good luck