本破解仅作学习研究用,请勿用于任何不法行为,否则后果自负。
软件名称:金易格坦克大战
下载:http://shareware.skycn.com/soft/4932.htm
编码语言:DELPHI 4.0-5.0
大 小:8.41M(压缩)
加密方式:注册码
使用工具:odbg110_cn,PEiD,w32dasm89cn
破解日期:2006年1月6日
破解人:[certainheart] QQ:8108306
试运行注册程序REGTANK.EXE,输入试炼码,发现有"产品注册码不对,请联系经销商或作者!"的字符串提示,以此为突破口。
首先用PEID查注册程序REGTANK.EXE,无壳。用w32dasm89cn反编译,点串式参考,查找"产品注册码不对,请联系经销商或作者!",双击,地址为0047D7FB。用odbg110_cn打开REGTANK.EXE,对0047D7FB下断点,F9运行程序,输入试炼码 CDCDCDCDC,点确认,拦截成功。
0047D7CF |. 8B83 F8020000 mov eax,dword ptr ds:[ebx+2F8]
0047D7D5 |. E8 4A40FBFF call RegTank.00431824
0047D7DA |. 8B55 FC mov edx,dword ptr ss:[ebp-4]
0047D7DD |. 8BC3 mov eax,ebx
0047D7DF |. E8 F0010000 call RegTank.0047D9D4
0047D7E4 |. 84C0 test al,al
0047D7E6 |. 75 25 jnz short RegTank.0047D80D
0047D7E8 |. 8B83 DC020000 mov eax,dword ptr ds:[ebx+2DC]
0047D7EE |. 8B40 58 mov eax,dword ptr ds:[eax+58]
0047D7F1 |. BA FFFF0000 mov edx,0FFFF
0047D7F6 |. E8 05C9F9FF call RegTank.0041A100
0047D7FB |. BA 5CD84700 mov edx,RegTank.0047D85C 《=====在此处成功拦截
0047D800 |. 8B83 DC020000 mov eax,dword ptr ds:[ebx+2DC]
0047D806 |. E8 5940FBFF call RegTank.00431864
0047D80B |. EB 1F jmp short RegTank.0047D82C
0047D80D |> 8D55 F8 lea edx,dword ptr ss:[ebp-8]
0047D810 |. 8B83 F8020000 mov eax,dword ptr ds:[ebx+2F8]
0047D816 |. E8 0940FBFF call RegTank.00431824
0047D81B |. 8B55 F8 mov edx,dword ptr ss:[ebp-8]
0047D81E |. 8BC3 mov eax,ebx
往上看几句可以发现可疑代码,如下:
0047D7CF |. 8B83 F8020000 mov eax,dword ptr ds:[ebx+2F8]
0047D7D5 |. E8 4A40FBFF call RegTank.00431824
0047D7DA |. 8B55 FC mov edx,dword ptr ss:[ebp-4]
0047D7DD |. 8BC3 mov eax,ebx
0047D7DF |. E8 F0010000 call RegTank.0047D9D4《=====可疑
0047D7E4 |. 84C0 test al,al《=====可疑
0047D7E6 |. 75 25 jnz short RegTank.0047D80D《=====可疑
0047D7E8 |. 8B83 DC020000 mov eax,dword ptr ds:[ebx+2DC]
0047D7EE |. 8B40 58 mov eax,dword ptr ds:[eax+58]
0047D7F1 |. BA FFFF0000 mov edx,0FFFF
0047D7F6 |. E8 05C9F9FF call RegTank.0041A100
0047D7FB |. BA 5CD84700 mov edx,RegTank.0047D85C 《=====在此处成功拦截
0047D800 |. 8B83 DC020000 mov eax,dword ptr ds:[ebx+2DC]
0047D806 |. E8 5940FBFF call RegTank.00431864
0047D80B |. EB 1F jmp short RegTank.0047D82C
0047D80D |> 8D55 F8 lea edx,dword ptr ss:[ebp-8]
0047D810 |. 8B83 F8020000 mov eax,dword ptr ds:[ebx+2F8]
0047D816 |. E8 0940FBFF call RegTank.00431824
0047D81B |. 8B55 F8 mov edx,dword ptr ss:[ebp-8]
0047D81E |. 8BC3 mov eax,ebx
对0047D7DF下断点,重新运行程序,测试发现该CALL的结果影响了显示的注册结果,表明0047D7DF为关键判断,F7跟进去。
来到以下:
0047D9D4 /$ 55 push ebp
0047D9D5 |. 8BEC mov ebp,esp
0047D9D7 |. 83C4 F8 add esp,-8
0047D9DA |. 53 push ebx
0047D9DB |. 56 push esi
0047D9DC |. 33C9 xor ecx,ecx
0047D9DE |. 894D F8 mov dword ptr ss:[ebp-8],ecx
0047D9E1 |. 8955 FC mov dword ptr ss:[ebp-4],edx
0047D9E4 |. 8B45 FC mov eax,dword ptr ss:[ebp-4]
0047D9E7 |. E8 A46FF8FF call RegTank.00404990
0047D9EC |. 33C0 xor eax,eax
0047D9EE |. 55 push ebp
0047D9EF |. 68 4DDA4700 push RegTank.0047DA4D
0047D9F4 |. 64:FF30 push dword ptr fs:[eax]
0047D9F7 |. 64:8920 mov dword ptr fs:[eax],esp
0047D9FA |. 33DB xor ebx,ebx
0047D9FC |. 8D45 F8 lea eax,dword ptr ss:[ebp-8]
0047D9FF |. 8B55 FC mov edx,dword ptr ss:[ebp-4]
0047DA02 |. E8 C56BF8FF call RegTank.004045CC
0047DA07 |.&nbs