This is an interesting crackme I found randomly. You can download it from here: http://www.mediafire.com/file/5r3a3uqsg1pbp4v/CrackMe1.zip
The algorithm uses the PID of the application for the serial key calculation. It also uses the ‘GetComputerName’ and ‘GetUserName’ win32 APIs in generating the serial key. The length of both results are used for the loops and each ascii value is added. These results are used in the final calculation in the serial key.
This graph is from the OllyGraph plugin.
This is the final calculation of the serial key.
I don’t think my keygen is accurate but works fine on my PC and tested this in another Windows 7 64-bit SP1 VM.
| #include "stdafx.h" | |
| #include <Windows.h> | |
| /* | |
| * Author: @OsandaMalith | |
| * Website: https://osandamalith.com | |
| */ | |
| void check(int *pid) { | |
| TCHAR computerName[MAX_COMPUTERNAME_LENGTH + 1]; | |
| DWORD size = sizeof(computerName) / sizeof(computerName[0]); | |
| GetComputerName(computerName, &size); | |
| printf("[+] Computer Name: %s\n", computerName); | |
| TCHAR computerUserName[MAX_COMPUTERNAME_LENGTH + 1]; | |
| size = sizeof computerUserName / sizeof *computerUserName; | |
| GetUserName(computerUserName, &size); | |
| printf("[+] Username: %s\n\n", computerUserName); | |
| int name = strlen((char *)(&computerName)); | |
| int username = strlen((char *)(&computerUserName)); | |
| int charName = *(char *)((int)&computerName); | |
| int charUser = *(char *)((int)&computerUserName); | |
| for (int i = 1; i < name; i++) | |
| charName += *(char *)(i + (int)&computerName); | |
| for (int i = 1; i < username; i++) | |
| charUser += *(char *)(i + (int)&computerUserName); | |
| int a = 9999 ^ *pid; | |
| int b = 2222 ^ charUser; | |
| int c = (a – b) ^ charName; | |
| printf("[~] Serial Key: %d–%d–%d\n\n",c,2222,9999); | |
| puts("[*] If the above doesn't work try this:\n"); | |
| a = 9999 ^ *pid; | |
| b = 2222 ^ charUser; | |
| c = (a – b) ^ 0; | |
| printf("[~] Serial Key: %d–%d–%d\n\n", c, 2222, 9999); | |
| } | |
| int _tmain(int argc, _TCHAR* argv[]){ | |
| puts("\t\t\t[~] caneacsu's CrackMe Keygen\n\t\t\t[~] Coded by @OsandaMalith"); | |
| int pid = 0; | |
| printf("\n\n[?] Enter PID: "); | |
| scanf("%d", &pid); | |
| check(&pid); | |
| return 0; | |
| } | |