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KryziK
Expert Cheater
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 Posted: Wed Dec 09, 2009 6:27 pm Post subject: Instruction to Opcode? |
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I am working on a trainer for Step 7, and it requires that you inject code to add by 2 instead of dec by 1.
I was wondering, how do I get the bytes of the address to jump to, created by VirtualAllocEx.
What I mean is, when VirtualAllocEx returns an address, how do I turn that into a jump opcode to that address with just bytes?
E9 98 5F 26 02 makes "JMP 026C0000" in this case, but how do I change that address to the returned one. I know how to write, I just need to know how to convert the address into those bytes.
Then, in the new memory, I have the code to increase by 2, and I need to make a jump back to where I was.
In AA this would be:
| Code: | alloc(newmem,2048) //2kb should be enough
label(returnhere)
label(exit)
0045A063:
jmp newmem
returnhere:
newmem:
add blahblah(i have this somewhere)
exit:
jmp returnhere |
I need to convert the address of newmem into a jump command in bytes, so it can be written. It seems that 0045A069 seems to be the returnhere address every time, so I can get that myself.
If I am being unclear please let me know. I have tried learning assembly by itself numerous times, but cannot get my head around it. This all makes sense, I am just not sure how to apply it.
Thanks! 
EDIT:: I just learned that what I want to do is an Instruction to Opcode/Byte conversion, but I cannot find any converters ANYWHERE. There is one on this forum from 2007 but I don't exactly get what to do with it. I'll check again though.
RE-EDIT:: Yeah, I have no clue how to use that, and I don't think I'll be able to. Any other ideas? Is there somewhere that I can learn how to manually convert...or is that extremely hard or anything?
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KryziK
Expert Cheater
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Joined: 16 Aug 2009
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| Posted: Tue Dec 15, 2009 3:53 pm Post subject: |
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Bump.
Dead forum?
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Dark Byte
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Location: The netherlands
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| Posted: Tue Dec 15, 2009 4:42 pm Post subject: |
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check assemblerunit.pas
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KryziK
Expert Cheater
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Joined: 16 Aug 2009
Posts: 199
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| Posted: Tue Dec 15, 2009 4:47 pm Post subject: |
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| Hey, thanks for the reply, but I don't have a SVN client installed, nor do I have a Pascal interpreter. Is there an area I am overlooking on the forum where it is residing besides SVN?
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Dark Byte
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| Posted: Tue Dec 15, 2009 5:23 pm Post subject: |
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http://cheatengine.org/downloads.php
just download "Cheat Engine 5.5 sourcecode"
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KryziK
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| Posted: Tue Dec 15, 2009 5:35 pm Post subject: |
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Oh, forgot about the "main site" 
Oh, my....where to begin... xD... I've never used Pascal before.
This may be a lost cause if it needs conversion.
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KryziK
Expert Cheater
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Joined: 16 Aug 2009
Posts: 199
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| Posted: Tue Dec 22, 2009 2:27 pm Post subject: |
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I have decided that I may be willing to convert it.
Problem is, I don't know pascal. Could you please go through the main parts and tell me what they mean so I will have an idea on how to do them in another language?
Thanks!
Edit: sorry for the DP, I don't know if editing a message sends a notification like a new post does.
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