Hard Live

Lost In The Binary

80 points

142 Solves

Reverse Engineering

ramza500

Community Rating: 4.68 / 5

Headline

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

I lost a flag inside this binary, please help me to find it. If you trigger certain anti-debugging techniques, you might get false flagsā€¦. flag format: FLAG-(str) https://mega.nz/#!ifgzQQCC!E1W0cSOFRvi7bE_v419rzwQB2jAHF0IsIRAWL6H1RNE

First 10 Solvers

Rank Username
1 vidar
2 blakeks4711
3 kronos
4 voidmercy
5 Yeraisci
Rank Username
6 getbackmazafaka
7 lunatic
8 slowr
9 lonelyboyz
10 kerrodali

Comments

    • Ichild

      -1

      flag format: FLAG-something, with no brackets. I was misled, founded two other false flags after I had found the right flag.

    • IT_Oracle

      0.0

      Whew, I confused myself a lot on that one hahahaha. Thanks for the super fun challenge, it taught be a ton of new things!

    • mavleop

      0.0

      I liked the challenge, was annoying that I I had to have a specific version of openssl installed. Was quicker just to manually recover.

    • domin568

      Protected 0.0

      [REDACTED] This comment is only shown to users who have solved this challenge.

      • mavleop

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        [REDACTED] This comment is only shown to users who have solved this challenge.

      • Rivit

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    • EdbR

      0.0

      Excellent ctf !!!

      • sheng855174

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        [REDACTED] This comment is only shown to users who have solved this challenge.

        • EdbR

          0.0

          Look on disassembler you will find some conditions that will help you find the correct parameters. And the parameters are not in md5.

          • sheng855174

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            • EdbR

              0.0

              You are very close !!! I passed the same way as you. You have the condition of "(rdp-34h), 4?" and as you know you need to pass 4 arguments. Now try to see in IDA where the flow goes if you passed 4 arguments. You will be see 4 if conditions that will helps you to generate 4 equation with 4 variable and by that you will find the correct arguments.

              • sheng855174

                0.0

                I succeed!!! I am freshman, interested in information security. Thank you!

                • EdbR

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            • b4el7d

              0.0

              Hello I had found another fake flag easy_f14g and using the if condition compose of 4 strtol and 4 equation i had found 4 value : 248.84050000000002 112.77770000000001 200.6176 309.4615

              but its so wrong. Can u help me to understand the method? TY

              • EdbR

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                • b4el7d

                  0.0

                  i cant read your comment

                • b4el7d

                  0.0

                  SOLVED wrong linear equation. Ty for support!

                  • EdbR

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