Heap Buffer Overflow

[mtv () yopmail com]

Can someone with experience help me with this? I am trying to write an exploit for a heap-based buffer overflow 
vulnerability in a specific windows-based daemon. The thing is the vulnerability is triggered by special characters, so 
i tried testing multiple times and debugging to see what happens but there is no way to overwrite the EIP or whatever 
register in the program, it just crashes because it can't handle the characters. I don't know how to even start here 
and I am not familiar with these kind of exploit techniques, even though I own quite a knowledge for stack buffer 
overflow vulnerabilities and exploitation. 
Can someone help me out? Give me something, at least some links or materials, tell me where or what to look for, 
anything. 
Thanks in advance.

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