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1. #How to use ollydbg to crack how to#
2. #How to use ollydbg to crack Patch#
3. #How to use ollydbg to crack code#
4. #How to use ollydbg to crack password#
5. #How to use ollydbg to crack download#

So select the code line by pressing it once and then press F2, now you see it turn red. Now we are going to set breakpoints after each UNICODE number we saw just a moment ago. When you set a breakpoint at a code line, the program will stop executing codes when it reaches the breakpoint.

#How to use ollydbg to crack password#

So now we have to crack the password and for that we use breakpoints. You can see “CMP EAX,7”, that means he is comparing the code, with the length of 7 characters so the password is indeed 7 characters. 83F8 07 CMP EAX,7 In this piece of code you can see it checks the string, in the register. So when you find it you should see this piece of code: 00402469. So you have to scroll up until you see this: “vbaLenBstr”, this is the Visual Basic code that checks a string. Now you want to know if the password is 7 characters long. Then you scroll up and you see these 7 UNICODE numbers. When you find it you can see that “ACCESS GRANTED” is beneath “Calculating…” and beneath that is “ACCESS DENIED”. But you see the first string before the second one so you will also see that in Ollydbg, so you better search for “Calculating…”. Now you have to find the string “Calculating…” or “ACCESS DENIED”. Now open Ollydbg and open the Login2.exe program. It says “Calculating…”, then “ACCESS DENIED”. Now press F9 to run the program and enter “H4x0R” as the password and you will see that it says “ACCESS GRANTED”Ĭhapter 2: Cracking program level 2 Open Login2.exe (created by BasTijs not me so it’s also real cracking for me) and enter “aaaaaaa” as the password. 5200 4100 4E00>UNICODE "RANTED",0 In the right down corner you see “Paused”, that means that the program is paused. “ACCESS GRANTED”, and above that you will see H4x0R: 00401848. When you find it, you look a little above the string and you will see You are searching for the string “ACCESS DENIED”, so scroll down until you find it. Open Ollydbg and then open the Login1.exe program.

Then you will see that the program says “ACCESS DENIED”, we want to have “ACCESS GRANTED”. First we need a string to search for so enter “aaaaa” as a password.

#How to use ollydbg to crack download#

Needless to say, reverse engineering may be illegal in your location, or on specific products (see EULA), so make sure that you're not doing anything that you are not allowed to do.What you need: -Little ASM knowledge -Ollydbg ( download from ) *Note: When cracking always have a backup of the program you are cracking in case you fuck up!!*Ĭhapter 1: Cracking program level 1 Open Login1.exe and you will see that the program asks for as password, and we need to find the password. Understand the PE/ELF file formats (or any other format you'd want to reverse engineer).Knowledge of (several) programming languages.Here's a list of (some of the) things you'd need to know:

#How to use ollydbg to crack how to#

If you're interested in learning how to reverse engineer applications there are many books on this subject that you can look for and read.

Use a tool like Regshot to compare changes in the registry.Here's a few a practical leads on how you could achieve what you're trying to do: This requires knowledge in general and specific areas, dependening on what kind of program you're trying to reverse engineer. What you're doing is trying to reverse engineer an application and change it to do what you want.

#How to use ollydbg to crack Patch#

You could also patch the kernel (which is probably unsuitable for a check like this, as it will affect the whole system) or simply find the check in the executable and change the code to jump it, or just remove it. patch the system call that checks for the date and time to return an acceptable value. change the system date and time to temporarily "crack" the program or b. For example, if you have a program that checks for the date and time in order to decide if the product is expired, you could: a. There are many ways to go about changing the behavior of programs.