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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

    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....

    M Offline
    M Offline
    Mark_Wallace
    wrote on last edited by
    #11

    Just use Java. Its objectfuscation makes it impenetrable to even the most valiant code-breakers.

    I wanna be a eunuchs developer! Pass me a bread knife!

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    • K kmoorevs

      :laugh: I was thinking the same thing! BTW, a few hours ago I checked in here and found the lounge completely empty! No messages, nothing...no soapbox, no hall of shame weird and wonderful...QA, though was still working though. I had started to wonder if we were just starting over or something. Oh well, good to see all is back to normal. :omg: ...or maybe it was just me? :confused:

      "Go forth into the source" - Neal Morse

      Sander RosselS Offline
      Sander RosselS Offline
      Sander Rossel
      wrote on last edited by
      #12

      kmoorevs wrote:

      the lounge completely empty

      I figure, there is no lounge :laugh:

      kmoorevs wrote:

      no soapbox, no hall of shame weird and wonderful...QA

      What do you mean? They're not real...

      kmoorevs wrote:

      good to see all is back to normal

      Alright, this has gone on long enough. There is no lounge, no QA, no CodeProject... They're all figments of your imagination. What you experienced was one of your brighter moments where you almost realized you live in a fantasy world and was about to snap out of it :sigh: We're increasing your therapy.

      Visit my blog at Sander's bits - Writing the code you need. Or read my articles at my CodeProject profile.

      Simplicity is prerequisite for reliability. — Edsger W. Dijkstra

      Regards, Sander

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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....

        F Offline
        F Offline
        Fabio Franco
        wrote on last edited by
        #13

        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

        L 1 Reply Last reply
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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

          T 1 Reply Last reply
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          • N Nelson Kosta Souto

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

            NKS

            T Offline
            T Offline
            thewazz
            wrote on last edited by
            #15

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

            N 1 Reply Last reply
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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

              S 1 Reply Last reply
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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

                1 Reply Last reply
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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

                  L Offline
                  L Offline
                  Lost User
                  wrote on last edited by
                  #18

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

                  1 Reply Last reply
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                  • T thewazz

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

                    N Offline
                    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

                    S 1 Reply Last reply
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                    • S Sascha Lefevre

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

                      S Offline
                      S Offline
                      Southmountain
                      wrote on last edited by
                      #20

                      thanks. it is great tool.

                      diligent hands rule....

                      S 1 Reply Last reply
                      0
                      • 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....

                          1 Reply Last reply
                          0
                          • 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/[^]

                              1 Reply Last reply
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