I compiled dll in VisualStudio 2019 and get 10 kb.

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Index > High Level Languages > I compiled dll in VisualStudio 2019 and get 10 kb.

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Roman

Joined: 21 Apr 2012
Posts: 1766

Roman 12 Dec 2020, 10:50

How i can get small size dll about 2 kb ?
And can i grab only one function from DLL ?

Last edited by Roman on 13 Dec 2020, 12:43; edited 1 time in total

12 Dec 2020, 10:50

bitRAKE

Joined: 21 Jul 2003
Posts: 4016
Location: vpcmpistri

bitRAKE 13 Dec 2020, 09:15

Code:

extern "C" // don't decorate name
__declspec(dllexport)
int
MyAdd(int A, int B) { return A + B; }

bool
__declspec(noinline)
__stdcall
_DllMainCRTStartup(int&, int, int&) { return true; }

disable security checks "/GS-", /NODEFLIB, etc ...

What do you mean by "grab function from DLL"? The DLL is either loaded or not.

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13 Dec 2020, 09:15

bitshifter

Joined: 04 Dec 2007
Posts: 796
Location: Massachusetts, USA

bitshifter 13 Dec 2020, 09:32

you can dynamically load individual library functions at runtime
is that what you meant?

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you just have to keep focused and take it one 'byte' at a time.

13 Dec 2020, 09:32

ProMiNick

Joined: 24 Mar 2012
Posts: 798
Location: Russian Federation, Sochi

ProMiNick 13 Dec 2020, 11:32

10 kb for HLL is very nice result if it is not interpretative DotNet program(for DotNet it is catastroficaly large result).
first of all HLL initialization, creating couples(up to 10) of critical sections, RTTI information, there present checking of windows version even if don`t needed, and many many other checks, may be inited internal memory manager even if it not needed...
so 10 kb for HLL is nice. (if it is not .NET exe).

13 Dec 2020, 11:32

Roman

Joined: 21 Apr 2012
Posts: 1766

Roman 13 Dec 2020, 12:41

bitRAKE wrote:

What do you mean by "grab function from DLL"? The DLL is either loaded or not.

Like as in IDA pro copy code of concrete function.
But do this in special program.

Cut because i need 3 kb code one function, but not all 13 kb dll !

13 Dec 2020, 12:41

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20298
Location: In your JS exploiting you and your system

revolution 13 Dec 2020, 12:44

Oh, so you want to use VS2019 to make some binary code, and then disassemble it and use the code as your own in asm files?

You don't even need to create the DLL. You can ask VS to output just the intermediate assembly text.

13 Dec 2020, 12:44

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