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Entrances outside code?

 
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dnsi0
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PostPosted: Wed Nov 12, 2008 8:00 pm    Post subject: Entrances outside code? Reply with quote
How do packers make the code so that the exe runs outside the code? All I know is it modifys the PE header.
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nog_lorp
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PostPosted: Thu Nov 13, 2008 12:54 am    Post subject: Reply with quote
Use a tool such as PEditor to edit the section attribute, to allow execution. I'm not sure, but I believe there are programmatic and/or compiler oriented ways of doing this too.
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BanMe
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PostPosted: Thu Nov 13, 2008 11:12 am    Post subject: Reply with quote
the CLR is a example of a entry outside the the original code section IE it Export CRTMain which then calls Main() in the code section .. this is the basis of that methodology.. as to how packers do it would be that the stub to unpack before execution is called before main so modifing the PE Entry to point to stub and then stub calls main ... at least that is how i understand it.. Twisted Evil
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dnsi0
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PostPosted: Thu Nov 13, 2008 5:59 pm    Post subject: Reply with quote
So.
PEHeader
MainCode


Packer Code

Pe header points to PackerCode. and after packercode is finished, It calls Maincode with an empty stack?
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hcavolsdsadgadsg
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PostPosted: Thu Nov 13, 2008 6:39 pm    Post subject: Reply with quote
nog_lorp wrote:
Use a tool such as PEditor to edit the section attribute, to allow execution. I'm not sure, but I believe there are programmatic and/or compiler oriented ways of doing this too.


It's a linker switch

/SECTION
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