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  3. how do you check the quality of your obfuscation of a .net assembly?

how do you check the quality of your obfuscation of a .net assembly?

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  • S Southmountain

    great info. thanks a million. could you name a few stand-alone deobfuscators?

    diligent hands rule....

    N Offline
    N Offline
    Nelson Kosta Souto
    wrote on last edited by
    #14

    Try also this... http://ilspy.net/[^]

    NKS

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    • N Nelson Kosta Souto

      Try also this... http://ilspy.net/[^]

      NKS

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      T Offline
      thewazz
      wrote on last edited by
      #15

      i think that's a viewer, not a deobfuscator.

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      • S Southmountain

        my assembly is .NET user control in C#. after I obfuscate it, I want to check how good is the obfuscation. So I used Red-gate Reflector to check class, method etc. What is your way to check the quality of obfuscation of a .net assembly?

        diligent hands rule....

        C Offline
        C Offline
        Chris Jacobi
        wrote on last edited by
        #16

        It feels funny to me to obfuscate a user control. What is there to keep secret? Usually people obfuscate important algorithms. Admitted, to break an obfuscation, an attacker will try to start fooling around with user controls and see what modifications that does to the execution of the application. People with need for strong obfuscations normally do not obfuscate byte code languages. These have a tendency to be easy to de-obfuscate. Strong obfuscations are done on machine code programs. I'm doing obfuscations for business. Like the original poster I would love to know the quality of obfuscations. I bet my obfuscations are unbreakable by amateurs. But how can you find out security against sophisticated attackers? The solution is to pay a readteam. However,for my startup, I would not have the slightest idea where to take the money from. Maybe somebody might try it as a challenge or a crackme, just for bragging rights. But then. if somebody posts an opinion, how much would you believe it? Chris Chris Jacobi Founder White Hawk Software www.whitehawksoftware.com

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        • S Southmountain

          my assembly is .NET user control in C#. after I obfuscate it, I want to check how good is the obfuscation. So I used Red-gate Reflector to check class, method etc. What is your way to check the quality of obfuscation of a .net assembly?

          diligent hands rule....

          T Offline
          T Offline
          thund3rstruck
          wrote on last edited by
          #17

          I open the binaries in ILSpy and if ILSpy doesn't throw an exception then the obfuscation is not good enough

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          • F Fabio Franco

            I once used an obfuscator that prevented both ILDasm and Reflector from even opening the assemblies. It removed the headers. I'm not sure how it got to bind the assemblies without the headers, but I think it would go further on making it harder to unobfuscate the assemblies.

            To alcohol! The cause of, and solution to, all of life's problems - Homer Simpson ---- Our heads are round so our thoughts can change direction - Francis Picabia

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            L Offline
            Lost User
            wrote on last edited by
            #18

            Hopefully it really did that and didn't just slap [SuppressIldasmAttribute] on everything..

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            • T thewazz

              i think that's a viewer, not a deobfuscator.

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              N Offline
              Nelson Kosta Souto
              wrote on last edited by
              #19

              ILSpy is the open-source .NET assembly browser and decompiler. If you have a c# DLL File or EXE, you can save decompiled assembly as .csproj and Assembly as C# Project.

              NKS

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              • S Sascha Lefevre

                From what I've read, de4dot[^] is probably the top dog deobfuscator or at least among them.

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                S Offline
                Southmountain
                wrote on last edited by
                #20

                thanks. it is great tool.

                diligent hands rule....

                S 1 Reply Last reply
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                • N Nelson Kosta Souto

                  ILSpy is the open-source .NET assembly browser and decompiler. If you have a c# DLL File or EXE, you can save decompiled assembly as .csproj and Assembly as C# Project.

                  NKS

                  S Offline
                  S Offline
                  Southmountain
                  wrote on last edited by
                  #21

                  I am using it right now besides some others..

                  diligent hands rule....

                  1 Reply Last reply
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                  • C Chris Jacobi

                    It feels funny to me to obfuscate a user control. What is there to keep secret? Usually people obfuscate important algorithms. Admitted, to break an obfuscation, an attacker will try to start fooling around with user controls and see what modifications that does to the execution of the application. People with need for strong obfuscations normally do not obfuscate byte code languages. These have a tendency to be easy to de-obfuscate. Strong obfuscations are done on machine code programs. I'm doing obfuscations for business. Like the original poster I would love to know the quality of obfuscations. I bet my obfuscations are unbreakable by amateurs. But how can you find out security against sophisticated attackers? The solution is to pay a readteam. However,for my startup, I would not have the slightest idea where to take the money from. Maybe somebody might try it as a challenge or a crackme, just for bragging rights. But then. if somebody posts an opinion, how much would you believe it? Chris Chris Jacobi Founder White Hawk Software www.whitehawksoftware.com

                    S Offline
                    S Offline
                    Southmountain
                    wrote on last edited by
                    #22

                    inside my user control I do have some algorithms to protect. I checked your website, but not see product yet...

                    diligent hands rule....

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                    • S Southmountain

                      thanks. it is great tool.

                      diligent hands rule....

                      S Offline
                      S Offline
                      Sascha Lefevre
                      wrote on last edited by
                      #23

                      glad I could help!

                      1 Reply Last reply
                      0
                      • S Southmountain

                        my assembly is .NET user control in C#. after I obfuscate it, I want to check how good is the obfuscation. So I used Red-gate Reflector to check class, method etc. What is your way to check the quality of obfuscation of a .net assembly?

                        diligent hands rule....

                        G Offline
                        G Offline
                        Ganesh R Rao
                        wrote on last edited by
                        #24

                        See if this tool can de-obfuscate your obfuscation: http://de4dot.com/[^]

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