UpGrade Posted September 1, 2020 Share Posted September 1, 2020 Hi all, I was wondering if anybody knows the process to edit locked .7z archives when they are made into custom installer like startisback? Link to comment Share on other sites More sharing options...
andy2004 Posted September 1, 2020 Share Posted September 1, 2020 i assume you mean a 7zip archive that is password protected.. in which case.. after a quick search.. i found an app called 7zcracker quote "7z Cracker is an opensource cracking tool which can extract any password protected 7zip file. It is developed for the purpose of helping users recover their files if they have forgotten the password." note is doesnt do encrypted, quote2 "Editor’s Important Note: While adding files to 7zip archive, just below the passwords field there is an option to encrypt the file name. While testing I observed that once this option is checked, 7zCracker will not be able to extract your files." Just tested this.. its a hoax app.. Link to comment Share on other sites More sharing options...
UpGrade Posted September 2, 2020 Author Share Posted September 2, 2020 7 hours ago, andy2004 said: i assume you mean a 7zip archive that is password protected.. in which case.. after a quick search.. i found an app called 7zcracker quote "7z Cracker is an opensource cracking tool which can extract any password protected 7zip file. It is developed for the purpose of helping users recover their files if they have forgotten the password." note is doesnt do encrypted, quote2 "Editor’s Important Note: While adding files to 7zip archive, just below the passwords field there is an option to encrypt the file name. While testing I observed that once this option is checked, 7zCracker will not be able to extract your files." Just tested this.. its a hoax app.. thanks but no, encryption and locked archives are 2 different things, if you take the installer for startisback as an example, open it in 7z and you'll see all the files, but try to add to the archive and you cant. I know theres a tool: https://github.com/CryptoNickSoft/7z-SFX-Constructor which looks like it should be able to do it but ive had no success. P.s. The latest versions of 7Zip use AES256 by default so the only way to "crack" or decrypt an encrypted archive without the password is brute force. This is time consuming and the longer the password the harder it is and more time it will take could even take longer than you live (with today's consumer level tech). Link to comment Share on other sites More sharing options...
Dodel Posted September 2, 2020 Share Posted September 2, 2020 3 hours ago, UpGrade said: thanks but no, encryption and locked archives are 2 different things, if you take the installer for startisback as an example, open it in 7z and you'll see all the files, but try to add to the archive and you cant. I know theres a tool: https://github.com/CryptoNickSoft/7z-SFX-Constructor which looks like it should be able to do it but ive had no success. P.s. The latest versions of 7Zip use AES256 by default so the only way to "crack" or decrypt an encrypted archive without the password is brute force. This is time consuming and the longer the password the harder it is and more time it will take could even take longer than you live (with today's consumer level tech). I've just grabbed the startisback installer from their website and unpacked with Winrar (5.91), and got the below file / folders:- Not sure if that's what you're attempting to do, if not you need to clarify exactly what you are trying to do. Regards Link to comment Share on other sites More sharing options...
UpGrade Posted September 2, 2020 Author Share Posted September 2, 2020 2 hours ago, Dodel said: I've just grabbed the startisback installer from their website and unpacked with Winrar (5.91), and got the below file / folders:- Not sure if that's what you're attempting to do, if not you need to clarify exactly what you are trying to do. Regards not quite, im trying to modify the installer not extract it, ive seen a few versions going around that are pre-cracked and its more for curiosity really im wondering how they are edited. Link to comment Share on other sites More sharing options...
Dodel Posted September 2, 2020 Share Posted September 2, 2020 18 minutes ago, UpGrade said: not quite, im trying to modify the installer not extract it, ive seen a few versions going around that are pre-cracked and its more for curiosity really im wondering how they are edited. Ah now I get you. I suspect it's extracted, the required files patched (xor'd, nop'd, et cetera) and then possibly repacked, given the primary installer isn't a 7zip file. It maybe worth grabbing an 'patched' version, and then the same version but 'unpatched' and then comparing the patched and unpatched files side by side in a hex editor. Link to comment Share on other sites More sharing options...
andy2004 Posted September 2, 2020 Share Posted September 2, 2020 if the file his trying to unpack isnt a 7zip but a portable exe file.. then it would be a good idea to download a app which can scan and tell him what app created it.. a few apps spring to mind ..all freeware.. Die aka Detect-it-easy.. Protection-id Nauz File detector. Then once the information has been found as to the compiler.. then a decompiler.. and maybe an unpacker if they packed the patched file.. Link to comment Share on other sites More sharing options...
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