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Opcode to bytes [C++]

 
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booingthetroll
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PostPosted: Fri Feb 08, 2013 7:11 pm    Post subject: Opcode to bytes [C++] Reply with quote

I discovered an exploit for Roblox, and I would like to automate it with C++. I have just about everything done except for one problem - I have the memory allocated(I hope... no errors), but I need to basically do
push [allocated mem addr]
As you know, they're mixed up and I don't know how to change "push 1234567" into 68 67 45 23 01. Anyway, how2do?
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Innovation
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PostPosted: Fri Feb 08, 2013 8:42 pm    Post subject: This post has 1 review(s) Reply with quote

0x01234567 -> {0x01, 0x23, 0x45, 0x67} -> {0x67, 0x45, 0x23, 0x01} (Reverse Order)

PUSH imm16/32 corresponds to 0x68 (see this for reference).

Putting it together, you have {0x68, 0x67, 0x45, 0x23, 0x01}.

The reason the bytes are reversed is that x86 uses little-endian.
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