Retrouver Serial Avec Ollydbg 64

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Retrouver Serial Avec Ollydbg 64Retrouver Serial Avec Ollydbg 64

From: Jessica To: w3pwnz Subject: New email from our contact Attachments: Thank you again for your help, our technical staff has a pretty good overview of the new device designed by Sciteek. Your account will be credited with $500. You did work hard enough to impress me, your help is still more than welcome, you will get nice rewards. Our anonymous guy managed to get access to another bunch of files. Here is one of his emails: --- Hi there, see attached file for more information.

It was found on --- Maybe you can get further than him by exploiting this website. We also need to get as much information as possible about the file itself. If you succeed, you will be rewarded with $2500 for the ndh file and $1000 for the website.

OllyDbg is a 32-bit assembler level analysing debugger for Microsoft® Windows®. Emphasis on binary code analysis makes it particularly useful in cases where source is unavailable. OllyDbg is a shareware, but you can download and use it for free. Special highlights are: Intuitive user interface, no cryptical commands. May 30, 2012 - 13 min - Uploaded by bryan45520TUTORIEL N°11 - [ Comment cracker un logiciel avec un WinHex et WinDasm ( Decryptage.

Pinnacle Studio 15 Hd Ultimate Collection Ita Download Itunes. Please use 'Sciteek shortener' and 'strange binary file #2' titles. Regards, Jessica. This challenge was another crackme. I called it 'VMception', and it was a little harder than the other one =) First we noticed the string 'password is wrong:' (0x8737), and another a little stranger 'Unhandled exception occured during execution.

From: Jessica To: w3pwnz Subject: unknown binary, need your help Attachments: Hello again, Thank you very much for your help. It is amazing that our technical staff and experts did not manage to recover any of it: the password sounds pretty weak.

I will notify our head of technical staff. Anyway, I forwarded them the file for further investigation. Meanwhile, we got fresh news from our mystery guy. He came along with an intersting binary file.

It just looks like an executable, but it is not ELF nor anything our experts would happen to know or recognize. Some of them we quite impressed by your skills and do think you may be able to succeed here. I attached the file, if you discover anything, please send me an email entitled 'Strange binary file'. This will be rewarded, as usual. By the way, your account has just been credited with $100. Regards, Jessica.

We first noticed the two strings ' Good password' and ' Bad password' at the end of the file. An easy way to attack a crackme is to search for string references in the code. The disassembly from vmndh tells us that the ' Bad password' string is loaded in 0x8480, and referenced from 0x82d4: 0x82d4: movl r0, # 0x8480 0x82d9: call 0xffdd 0x82dd: ret This is the ' bad boy' case, and whatever ' call 0xffdd' is, it must be the impression routine. There were two methods to get the actual adresses of the calls: check them in the debugger, or patch the disassembled output to translate relative calls into absolute ones. This is what does. With it, we can see that the address 0x82d4 is called 9 times between 0x82e8 and 0x83e1, just after ' jz' instructions. A first test is made, that checks the length of the input: 0x82e8: mov r7, r0 0x82ec: movl r6, # 0x840d 0x82f1: call 0x8003 0x82f5: cmpb r0, # 09; 9 bytes (8 without ' x0a') 0x82f9: jz 0x0005 0x82fc: call 0x82d4; ->bad boy 0x8300: end After that, each time the bytes pointed by r7 and r6 are xored together and compared to a hardcoded value.

From: Jessica To: w3pwnz Subject: New email from our contact Attachments: Thank you again for your help, our technical staff has a pretty good overview of the new device designed by Sciteek. Your account will be credited with $500. You did work hard enough to impress me, your help is still more than welcome, you will get nice rewards.

Our anonymous guy managed to get access to another bunch of files. Here is one of his emails: --- Hi there, see attached file for more information. It was found on --- Maybe you can get further than him by exploiting this website. We also need to get as much information as possible about the file itself. If you succeed, you will be rewarded with $2500 for the ndh file and $1000 for the website.

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