新160个CrackMe 007--Reg.exe注册算法分析
本帖最后由 lies2014 于 2022-10-5 03:59 编辑CrackMe程序运行后输入用户名和序列号,提示重启验证。
如何找到验证Call和真码比较简单,在这里我就不在赘述,大家可以参考以下教程:
文字教程:https://www.bilibili.com/read/cv18424843
视频教程:https://www.bilibili.com/video/BV1oa411z7rs
因为代码看起来比较复杂,上面两个教程都没有对注册算法进行分析。以往我总是满足于能够爆破而不思进取,搞得自己一直没有进步,这次终于国庆节长假有点时间,而某些原因又限制了出行不敢乱跑,终于潜下心来,打算痛改前非,勇攀高峰,刀口向内,自我革命,花了一天时间做了分析,并写下了人生第一个没啥X用的注册机。
具体的代码分析之前,先讲讲分析过程中个人的一些心得:动态调试是算法分析的一大利器,分析之前先以步过的方式大致的看一下每一个Call的参数及输出结果,有些调用很明显就能看出功能,可以跳过省下不少时间;动态分析目前Windows平台下x64dbg无疑是最好用的工具之一,而且现在很多都是64位的程序,OD已经力不从心了,而x64dbg一直在频繁的改进,我自从用了x64dbg以后就再也没有碰过OD了,早用早受益;x64dbg也有局限,这时可以结合IDA,将IDA分析的结果导出Map供x64dbg使用,可以看到x64dbg分析不出的一些信息,比如一些高级语言的函数,这也是事半功倍的;分析过程中及时做好代码注释,以前过分相信自己的记忆,分析过程中只看不记,总觉得回头看到就能想起,现实是随着年老色衰,往往是几秒前问候过的代码都觉得陌生,尤其是Call进去后的第一行代码注释,往往很多地方调用,来来回回翻看很不方便,如果有注释点击Call进去看就知道这段代码的功能了。
以下是注册算法的主要部分:
0045C61D lea edx,dword ptr ss:
0045C620 mov eax,dword ptr ss: 用户名"lies2022"
0045C623 call <reg.sub_45BE3C> 计算用户名MD5(32)
0045C628 lea eax,dword ptr ss: 前一个Call返回的MD5
0045C62B lea edx,dword ptr ss:
0045C62E call reg.45BEB0 MD5转字符串
0045C633 lea edx,dword ptr ss: "f3b715cab9553c8aaff743c61562a308"
0045C636 mov eax,dword ptr ss: 到期时间"110512"
0045C639 call <reg.sub_45BE3C> 到期时间MD5
0045C63E lea eax,dword ptr ss: 前一个Call返回的MD5
0045C641 lea edx,dword ptr ss:
0045C644 call reg.45BEB0 MD5转字符串
0045C649 lea eax,dword ptr ss: "316a6f4ced05edfc00f35e2699f0b762"
0045C64C mov ecx,dword ptr ss:
0045C64F mov edx,dword ptr ss:
0045C652 call <reg.@System@@LStrCat3$qqrv> 前两个MD5字符串合并
0045C657 mov eax,dword ptr ss: "f3b715cab9553c8aaff743c61562a308316a6f4ced05edfc00f35e2699f0b762"
0045C65A lea edx,dword ptr ss:
0045C65D call <reg.sub_45BE3C> 合并串MD5
0045C662 lea eax,dword ptr ss:
0045C665 lea edx,dword ptr ss:
0045C668 call reg.45BEB0 合并串MD5转字符串
0045C66D lea eax,dword ptr ss: "45a5199feb18a39980fe17a5da4dad98"
0045C670 mov edx,dword ptr ss:
0045C673 call <reg.@System@@LStrLAsg$qqrpvpxv>
0045C678 lea eax,dword ptr ss:
0045C67B push eax
0045C67C mov ecx,0x2 取2位
0045C681 mov edx,0x1 从第1位开始
0045C686 mov eax,dword ptr ss: "110512"
0045C689 call <reg.Delphi_Copy_404880> 从第1位开始取2位
0045C68E mov eax,dword ptr ss:
0045C691 call <reg.Delphi_StrToInt_408528> 字符串转整数
0045C696 mov ebx,eax ebx=11
0045C698 lea eax,dword ptr ss:
0045C69B push eax
0045C69C mov ecx,0x2
0045C6A1 mov edx,0x3
0045C6A6 mov eax,dword ptr ss:
0045C6A9 call <reg.Delphi_Copy_404880>
0045C6AE mov eax,dword ptr ss:
0045C6B1 call <reg.Delphi_StrToInt_408528>
0045C6B6 mov esi,eax esi=5
0045C6B8 lea eax,dword ptr ss:
0045C6BB push eax
0045C6BC mov ecx,0x2
0045C6C1 mov edx,0x5
0045C6C6 mov eax,dword ptr ss:
0045C6C9 call <reg.Delphi_Copy_404880>
0045C6CE mov eax,dword ptr ss:
0045C6D1 call <reg.Delphi_StrToInt_408528>
0045C6D6 mov edi,eax edi=12
0045C6D8 lea eax,dword ptr ss:
0045C6DB push eax
0045C6DC lea edx,dword ptr ss:
0045C6DF mov eax,ebx 11
0045C6E1 call reg.45C044 转二进制
0045C6E6 mov eax,dword ptr ss: "00001011"
0045C6E9 mov ecx,0x7
0045C6EE mov edx,0x2
0045C6F3 call <reg.Delphi_Copy_404880> 第2位开始取7位
0045C6F8 push dword ptr ss: "0001011"
0045C6FB lea eax,dword ptr ss:
0045C6FE push eax
0045C6FF lea edx,dword ptr ss:
0045C702 mov eax,esi 5
0045C704 call reg.45C044 转二进制
0045C709 mov eax,dword ptr ss: "00000101"
0045C70C mov ecx,0x4
0045C711 mov edx,0x5
0045C716 call <reg.Delphi_Copy_404880> 第5位开始取4位
0045C71B push dword ptr ss: "0101"
0045C71E lea eax,dword ptr ss:
0045C721 push eax
0045C722 lea edx,dword ptr ss:
0045C725 mov eax,edi 12
0045C727 call reg.45C044 转二进制
0045C72C mov eax,dword ptr ss: "00001100"
0045C72F mov ecx,0x5
0045C734 mov edx,0x4
0045C739 call <reg.Delphi_Copy_404880> 第4位开始取5位
0045C73E push dword ptr ss: "01100"
0045C741 lea eax,dword ptr ss:
0045C744 mov edx,0x3
0045C749 call <reg.@System@@LStrCatN$qqrv> 上面三个串合并"0001011010101100"
0045C74E lea eax,dword ptr ss:
0045C751 mov edx,dword ptr ss:
0045C754 mov dl,byte ptr ds:
0045C757 mov byte ptr ds:,dl
0045C75A mov byte ptr ds:,0x1 二进制串取第3位ASCII,前面插入1(0130)
0045C75D lea edx,dword ptr ss: ^低位1表示长度
0045C760 lea eax,dword ptr ss:
0045C763 call <reg.@System@@PStrCpy$qqrp28System@%SmallString$iuc$255%t1>
0045C768 lea eax,dword ptr ss:
0045C76E mov edx,dword ptr ss:
0045C771 mov dl,byte ptr ds:
0045C774 mov byte ptr ds:,dl
0045C777 mov byte ptr ds:,0x1 二进制串取第4位ASCII,前面插入1(0131)
0045C77A lea edx,dword ptr ss:
0045C780 lea eax,dword ptr ss:
0045C783 mov cl,0x2
0045C785 call <reg.@System@@PStrNCat$qqrv> 合并上面两串(023031)
0045C78A lea edx,dword ptr ss: ^第1位2表示长度
0045C78D lea eax,dword ptr ss:
0045C793 call <reg.@System@@PStrCpy$qqrp28System@%SmallString$iuc$255%t1>
0045C798 lea eax,dword ptr ss:
0045C79E mov edx,dword ptr ss:
0045C7A1 mov dl,byte ptr ds:
0045C7A4 mov byte ptr ds:,dl 二进制串取第5位ASCII,前面插入1(0130)
0045C7A7 mov byte ptr ds:,0x1
0045C7AA lea edx,dword ptr ss:
0045C7B0 lea eax,dword ptr ss:
0045C7B6 mov cl,0x3
0045C7B8 call <reg.@System@@PStrNCat$qqrv>
0045C7BD lea edx,dword ptr ss:
0045C7C3 lea eax,dword ptr ss:
0045C7C9 call <reg.@System@@PStrCpy$qqrp28System@%SmallString$iuc$255%t1>
0045C7CE lea eax,dword ptr ss:
0045C7D4 mov edx,dword ptr ss:
0045C7D7 mov dl,byte ptr ds: 二进制串第9位
0045C7DA mov byte ptr ds:,dl
0045C7DD mov byte ptr ds:,0x1
0045C7E0 lea edx,dword ptr ss:
0045C7E6 lea eax,dword ptr ss:
0045C7EC mov cl,0x4
0045C7EE call <reg.@System@@PStrNCat$qqrv>
0045C7F3 lea edx,dword ptr ss:
0045C7F9 lea eax,dword ptr ss:
0045C7FF call <reg.@System@@PStrCpy$qqrp28System@%SmallString$iuc$255%t1>
0045C804 lea eax,dword ptr ss:
0045C80A mov edx,dword ptr ss:
0045C80D mov dl,byte ptr ds: 二进制串第10位
0045C810 mov byte ptr ds:,dl
0045C813 mov byte ptr ds:,0x1
0045C816 lea edx,dword ptr ss:
0045C81C lea eax,dword ptr ss:
0045C822 mov cl,0x5
0045C824 call <reg.@System@@PStrNCat$qqrv>
0045C829 lea edx,dword ptr ss:
0045C82F lea eax,dword ptr ss:
0045C835 call <reg.@System@@PStrCpy$qqrp28System@%SmallString$iuc$255%t1>
0045C83A lea eax,dword ptr ss:
0045C840 mov edx,dword ptr ss:
0045C843 mov dl,byte ptr ds: 二进制串第13位
0045C846 mov byte ptr ds:,dl
0045C849 mov byte ptr ds:,0x1
0045C84C lea edx,dword ptr ss:
0045C852 lea eax,dword ptr ss:
0045C858 mov cl,0x6
0045C85A call <reg.@System@@PStrNCat$qqrv>
0045C85F lea edx,dword ptr ss:
0045C865 lea eax,dword ptr ss:
0045C86B call <reg.@System@@PStrCpy$qqrp28System@%SmallString$iuc$255%t1>
0045C870 lea eax,dword ptr ss:
0045C876 mov edx,dword ptr ss:
0045C879 mov dl,byte ptr ds: 二进制串第14位
0045C87C mov byte ptr ds:,dl
0045C87F mov byte ptr ds:,0x1
0045C882 lea edx,dword ptr ss:
0045C888 lea eax,dword ptr ss:
0045C88E mov cl,0x7
0045C890 call <reg.@System@@PStrNCat$qqrv>
0045C895 lea edx,dword ptr ss:
0045C89B lea eax,dword ptr ss:
0045C8A1 call <reg.@System@@PStrCpy$qqrp28System@%SmallString$iuc$255%t1>
0045C8A6 lea eax,dword ptr ss:
0045C8AC mov edx,dword ptr ss:
0045C8AF mov dl,byte ptr ds: 二进制串第15位
0045C8B2 mov byte ptr ds:,dl
0045C8B5 mov byte ptr ds:,0x1
0045C8B8 lea edx,dword ptr ss:
0045C8BE lea eax,dword ptr ss:
0045C8C4 mov cl,0x8
0045C8C6 call <reg.@System@@PStrNCat$qqrv> 上面8位合并"01010110"
0045C8CB lea edx,dword ptr ss: 带长度的"01010110"
0045C8D1 lea eax,dword ptr ss:
0045C8D4 call <reg.unknown_libname_76> LStrFromPCharLen
0045C8D9 mov eax,dword ptr ss: "01010110"
0045C8DC call <reg.sub_45BF94> 循环读取二进制串,遇1则将剩余循环次数n做1<<n,结果累加
0045C8E1 lea ecx,dword ptr ss: 0x56
0045C8E4 mov edx,0x2
0045C8E9 call <reg.@Sysutils@IntToHex$qqrii>
0045C8EE mov eax,dword ptr ss: "56"
0045C8F1 push eax
0045C8F2 lea eax,dword ptr ss:
0045C8F5 mov edx,dword ptr ss: "0001011010101100"
0045C8F8 mov dl,byte ptr ds:
0045C8FA mov byte ptr ds:,dl 二进制串第1位(30)
0045C8FD mov byte ptr ds:,0x1 长度1
0045C900 lea edx,dword ptr ss:
0045C903 lea eax,dword ptr ss:
0045C906 call <reg.@System@@PStrCpy$qqrp28System@%SmallString$iuc$255%t1>
0045C90B lea eax,dword ptr ss:
0045C911 mov edx,dword ptr ss:
0045C914 mov dl,byte ptr ds:
0045C917 mov byte ptr ds:,dl 二进制串第2位(30)
0045C91A mov byte ptr ds:,0x1
0045C91D lea edx,dword ptr ss:
0045C923 lea eax,dword ptr ss:
0045C926 mov cl,0x2
0045C928 call <reg.@System@@PStrNCat$qqrv> 合并上面两串(023031)
0045C92D lea edx,dword ptr ss: ^第1位2表示长度
0045C930 lea eax,dword ptr ss:
0045C936 call <reg.@System@@PStrCpy$qqrp28System@%SmallString$iuc$255%t1>
0045C93B lea eax,dword ptr ss:
0045C941 mov edx,dword ptr ss:
0045C944 mov dl,byte ptr ds:
0045C947 mov byte ptr ds:,dl 二进制串第6位(31)
0045C94A mov byte ptr ds:,0x1
0045C94D lea edx,dword ptr ss:
0045C953 lea eax,dword ptr ss:
0045C959 mov cl,0x3
0045C95B call <reg.@System@@PStrNCat$qqrv>
0045C960 lea edx,dword ptr ss:
0045C966 lea eax,dword ptr ss:
0045C96C call <reg.@System@@PStrCpy$qqrp28System@%SmallString$iuc$255%t1>
0045C971 lea eax,dword ptr ss:
0045C977 mov edx,dword ptr ss:
0045C97A mov dl,byte ptr ds:
0045C97D mov byte ptr ds:,dl 二进制串第7位(31)
0045C980 mov byte ptr ds:,0x1
0045C983 lea edx,dword ptr ss:
0045C989 lea eax,dword ptr ss:
0045C98F mov cl,0x4
0045C991 call <reg.@System@@PStrNCat$qqrv>
0045C996 lea edx,dword ptr ss:
0045C99C lea eax,dword ptr ss:
0045C9A2 call <reg.@System@@PStrCpy$qqrp28System@%SmallString$iuc$255%t1>
0045C9A7 lea eax,dword ptr ss:
0045C9AD mov edx,dword ptr ss:
0045C9B0 mov dl,byte ptr ds:
0045C9B3 mov byte ptr ds:,dl 二进制串第8位(30)
0045C9B6 mov byte ptr ds:,0x1
0045C9B9 lea edx,dword ptr ss:
0045C9BF lea eax,dword ptr ss:
0045C9C5 mov cl,0x5
0045C9C7 call <reg.@System@@PStrNCat$qqrv>
0045C9CC lea edx,dword ptr ss:
0045C9D2 lea eax,dword ptr ss:
0045C9D8 call <reg.@System@@PStrCpy$qqrp28System@%SmallString$iuc$255%t1>
0045C9DD lea eax,dword ptr ss:
0045C9E3 mov edx,dword ptr ss:
0045C9E6 mov dl,byte ptr ds:
0045C9E9 mov byte ptr ds:,dl 二进制串第11位(31)
0045C9EC mov byte ptr ds:,0x1
0045C9EF lea edx,dword ptr ss:
0045C9F5 lea eax,dword ptr ss:
0045C9FB mov cl,0x6
0045C9FD call <reg.@System@@PStrNCat$qqrv>
0045CA02 lea edx,dword ptr ss:
0045CA08 lea eax,dword ptr ss:
0045CA0E call <reg.@System@@PStrCpy$qqrp28System@%SmallString$iuc$255%t1>
0045CA13 lea eax,dword ptr ss:
0045CA19 mov edx,dword ptr ss:
0045CA1C mov dl,byte ptr ds:
0045CA1F mov byte ptr ds:,dl 二进制串第12位(30)
0045CA22 mov byte ptr ds:,0x1
0045CA25 lea edx,dword ptr ss:
0045CA2B lea eax,dword ptr ss:
0045CA31 mov cl,0x7
0045CA33 call <reg.@System@@PStrNCat$qqrv>
0045CA38 lea edx,dword ptr ss:
0045CA3E lea eax,dword ptr ss:
0045CA44 call <reg.@System@@PStrCpy$qqrp28System@%SmallString$iuc$255%t1>
0045CA49 lea eax,dword ptr ss:
0045CA4F mov edx,dword ptr ss:
0045CA52 mov dl,byte ptr ds:
0045CA55 mov byte ptr ds:,dl 二进制串第16位(30)
0045CA58 mov byte ptr ds:,0x1
0045CA5B lea edx,dword ptr ss:
0045CA61 lea eax,dword ptr ss:
0045CA67 mov cl,0x8
0045CA69 call <reg.@System@@PStrNCat$qqrv> 上面8位合并"00110100"
0045CA6E lea edx,dword ptr ss: 带长度的"00110100"
0045CA74 lea eax,dword ptr ss:
0045CA7A call <reg.unknown_libname_76>
0045CA7F mov eax,dword ptr ss: "00110100"
0045CA85 call <reg.sub_45BF94> 循环读取二进制串,遇1则将剩余循环次数n做1<<n,结果累加
0045CA8A lea ecx,dword ptr ss: 0x34
0045CA90 mov edx,0x2
0045CA95 call <reg.@Sysutils@IntToHex$qqrii>
0045CA9A mov edx,dword ptr ss: "34"
0045CAA0 lea eax,dword ptr ss:
0045CAA3 pop ecx "56"上一次结果
0045CAA4 call <reg.@System@@LStrCat3$qqrv> 两串合并"3456"
0045CAA9 lea eax,dword ptr ss:
0045CAAF mov ecx,dword ptr ss: "f3b715cab9553c8aaff743c61562a308"用户名MD5
0045CAB2 mov edx,dword ptr ss: "3456"
0045CAB5 call <reg.@System@@LStrCat3$qqrv>
0045CABA mov eax,dword ptr ss: "3456f3b715cab9553c8aaff743c61562a308"
0045CAC0 lea edx,dword ptr ss:
0045CAC3 call <reg.sub_45C244> 将eax按位读取,与dl最后1位亦或为1则(dl^0x18)>>1||0x80,为0则dl>>1(dl初始0),结果转为16进制字符串"EA"
0045CAC8 lea eax,dword ptr ss:
0045CACB push eax
0045CACC lea eax,dword ptr ss:
0045CAD2 mov ecx,dword ptr ss: 上个Call结果"EA"
0045CAD5 mov edx,dword ptr ss: "3456"
0045CAD8 call <reg.@System@@LStrCat3$qqrv> "3456"+"EA"
0045CADD mov eax,dword ptr ss: "3456EA"
0045CAE3 lea edx,dword ptr ss:
0045CAE6 call <reg.sub_45BE3C> MD5(32)
0045CAEB lea eax,dword ptr ss:
0045CAEE lea edx,dword ptr ss:
0045CAF4 call reg.45BEB0 MD5转字符串
0045CAF9 mov eax,dword ptr ss: "6189a4059d33687fea8dfe485d4e07c8"
0045CAFF mov ecx,0x2
0045CB04 mov edx,0x8
0045CB09 call <reg.Delphi_Copy_404880> 第8位开始取2位"59"
0045CB0E lea eax,dword ptr ss:
0045CB14 mov ecx,dword ptr ss: "45a5199feb18a39980fe17a5da4dad98"合并串MD5
0045CB17 mov edx,dword ptr ss: "f3b715cab9553c8aaff743c61562a308"用户名MD5
0045CB1A call <reg.@System@@LStrCat3$qqrv> 合并前面2字符串
0045CB1F mov eax,dword ptr ss: "f3b715cab9553c8aaff743c61562a30845a5199feb18a39980fe17a5da4dad98"
0045CB25 lea edx,dword ptr ss:
0045CB28 call <reg.sub_45C244> 将eax按位读取,与dl最后1位亦或为1则(dl^0x18)>>1||0x80,为0则dl>>1(dl初始0),结果转为16进制字符串"6E"
0045CB2D lea eax,dword ptr ss:
0045CB33 mov ecx,dword ptr ss: "45a5199feb18a39980fe17a5da4dad98"合并串MD5
0045CB36 mov edx,dword ptr ss: "316a6f4ced05edfc00f35e2699f0b762"到期时间MD5
0045CB39 call <reg.@System@@LStrCat3$qqrv>
0045CB3E mov eax,dword ptr ss: "316a6f4ced05edfc00f35e2699f0b76245a5199feb18a39980fe17a5da4dad98"
0045CB44 lea edx,dword ptr ss:
0045CB47 call <reg.sub_45C244> 将eax按位读取,与dl最后1位亦或为1则(dl^0x18)>>1||0x80,为0则dl>>1(dl初始0),结果转为16进制字符串"30"
0045CB4C push dword ptr ss:
0045CB4F push dword ptr ss:
0045CB52 push dword ptr ss:
0045CB55 lea eax,dword ptr ss:
0045CB5B mov edx,dword ptr ss: "45a5199feb18a39980fe17a5da4dad98"
0045CB5E mov dl,byte ptr ds: 从第8位开始取1位(取第8位)
0045CB61 call <reg.unknown_libname_73> LStrFromPCharLen取1位
0045CB66 push dword ptr ss: "f"
0045CB6C lea eax,dword ptr ss:
0045CB72 mov edx,dword ptr ss:
0045CB75 mov dl,byte ptr ds: 取第16位
0045CB78 call <reg.unknown_libname_73>
0045CB7D push dword ptr ss: "9"
0045CB83 push dword ptr ss:
0045CB86 lea eax,dword ptr ss:
0045CB8C mov edx,dword ptr ss:
0045CB8F mov dl,byte ptr ds: 取第24位
0045CB92 call <reg.unknown_libname_73>
0045CB97 push dword ptr ss: "5"
0045CB9D lea eax,dword ptr ss:
0045CBA3 mov edx,dword ptr ss:
0045CBA6 mov dl,byte ptr ds: 取第12位
0045CBA9 call <reg.unknown_libname_73>
0045CBAE push dword ptr ss: "8"
0045CBB4 push dword ptr ss: "30"来自0045CB47
0045CBB7 lea eax,dword ptr ss:
0045CBBD mov edx,0x9 9:'\t'
0045CBC2 call <reg.@System@@LStrCatN$qqrv> 将上面数个字符连接,Call后出现真码
0045CBC7 mov eax,dword ptr ss: "EA345659f96E5830"
0045CBCD lea edx,dword ptr ss:
0045CBD0 call <reg.@Sysutils@UpperCase$qqrx17System@AnsiString> 转换成大写
0045CBD5 mov eax,dword ptr ss:
0045CBD8 mov edx,dword ptr ss: "EA345659F96E5830"真码
0045C62 call <reg.sub_45BE3C>这个调用是计算MD5的,实际上我并未跟进去,只是动态调试的时候看着像是MD5,用工具验证了一下确实结果一样,所以之前就说过动态调试的重要性,这些算法给源代码我都未必能看懂,何况是反汇编,如果硬磕估计会影响某些功能。
注册算法中0045C67C-0045CAA4之间的代码尽管很长,其实就是用有效期算出一个4位字符串,而有效期是一个固定的“110512”,因此这个结果字符串也是固定的“3456”,我们在最后写注册机的时候直接使用即可,不必复现计算过程。这部分Call里面我就不详细的说明了,Call的作用我已经在代码后面注明,感兴趣的可以自己跟进去看一下。
CrackMe是用Delphi编写的,IDA已经分析出了一些函数名,函数具体功能可以在网络上很方便的查到。
0045CAC call <reg.sub_45C244>是对输入串做计算,输出一个2位字符串,算法如下:
0045C274 mov eax,dword ptr ss: "3456f3b715cab9553c8aaff743c61562a308"
0045C277 call <reg.unknown_libname_78> 取长度0x24
0045C27C and eax,0x80000001 结果0
0045C281 jns reg.45C288
0045C283 dec eax
0045C284 or eax,0xFFFFFFFE
0045C287 inc eax
0045C288 dec eax 结果-1
0045C289 jne reg.45C298
0045C28B lea eax,dword ptr ss:
0045C28E mov edx,reg.45C360 45C360:L"0"
0045C293 call <reg.@System@@LStrCat$qqrv>
0045C298 mov eax,dword ptr ss: "3456f3b715cab9553c8aaff743c61562a308"
0045C29B call <reg.unknown_libname_78> 取长度0x24
0045C2A0 mov esi,eax
0045C2A2 sar esi,0x1 结果0x12
0045C2A4 jns reg.45C2A9
0045C2A6 adc esi,0x0
0045C2A9 test esi,esi
0045C2AB jle reg.45C2F2
0045C2AD mov edi,0x1
0045C2B2 lea ebx,dword ptr ss:
0045C2B8 push 0x1F4
0045C2BD lea eax,dword ptr ss:
0045C2C3 push eax
0045C2C4 mov eax,edi
0045C2C6 dec eax
0045C2C7 mov edx,eax
0045C2C9 add edx,edx
0045C2CB inc edx
0045C2CC mov ecx,0x2
0045C2D1 mov eax,dword ptr ss: "3456f3b715cab9553c8aaff743c61562a308"
0045C2D4 call <reg.Delphi_Copy_404880> 从edx位取2位
0045C2D9 mov eax,dword ptr ss: 取出的2位
0045C2DF xor ecx,ecx
0045C2E1 mov edx,0x10
0045C2E6 call <reg.sub_45C118> StrToInt
0045C2EB mov byte ptr ds:,al
0045C2ED inc edi
0045C2EE inc ebx
0045C2EF dec esi
0045C2F0 jne reg.45C2B8 以上循环将字符串转为数字
0045C2F2 mov eax,dword ptr ss: "3456f3b715cab9553c8aaff743c61562a308"
0045C2F5 call <reg.unknown_libname_78> 取长度0x24
0045C2FA sar eax,0x1
0045C2FC jns reg.45C301
0045C2FE adc eax,0x0
0045C301 lea edx,dword ptr ss: 0x3456f3b715cab9553c8aaff743c61562a308
0045C307 mov ecx,eax
0045C309 mov eax,0xFF
0045C30E xchg edx,eax
0045C30F call reg.45C09C 将eax按位读取,与dl最后1位亦或为1则(dl^0x18)>>1||0x80(dl初始0)
0045C314 mov ebx,eax
0045C316 mov ecx,dword ptr ss:
0045C319 xor eax,eax
0045C31B mov al,bl
0045C31D mov edx,0x2
0045C322 call <reg.@Sysutils@IntToHex$qqrii> 将上面Call结果转为16进制字符串
到这里涉及计算的部分就结束了,剩下的部分就是把前面的计算结果拼起来,生成16位字符串,最后转换成大写的序列号。
最后写注册机,想起原来看到过一个aardio的国人开发的小巧的编程语言,早就想试试,就用他吧。于是花了半天时间学习了一下语法,敲下了总共三十行代码,边学边做平均五分钟一行的速度,是不是太笨了?不过出来的东西感觉还不错,是我喜欢的简洁明了。
注册机代码:
function ToHex(src){
var data = 0;
len = string.len(src);
for(i = 1; len; 2){
one = tonumber('0x' + string.slice(src, i, i + 1,));
for(j = 1; 8){
if((((one >> (j - 1)) & 1) ^ (data & 1)) == 1){
data = ((data ^ 0x18) >> 1) | 0x80;
}
else{
data = data >> 1;
}
}
}
return string.format("%02X",data);
}
mainForm.button.oncommand = function(id,event){
if(mainForm.edit.text == ''){mainForm.edit2.text = '请输入用户名';}
else{
usermd5 = crypt.md5(mainForm.edit.text, 0);
datemd5 = crypt.md5('110512', 0);
catmd5 = crypt.md5(usermd5 + datemd5);
Key = ToHex('3456' + usermd5);
Key = Key + '3456' + string.slice(crypt.md5('3456' + Key), 8, 9) + string.slice(catmd5,8,8) +
string.slice(catmd5,15,15) + ToHex(usermd5 + catmd5) + string.slice(catmd5,24,24) +
string.slice(catmd5,12,12) + ToHex(datemd5 + catmd5);
mainForm.edit2.text = Key;
file = io.open('reg.dll', 'w');
file.write('UserName=', mainForm.edit.text, '\n');
file.write('SN=', Key, '\n');
file.close();
}
}
编译好后,验证一下,注册机输入用户名,生成注册码后自动生成注册需要的reg.dll文件(其实就是个文本文件)。
reg.dll复制到CrackMe同目录,运行CrackMe,大功告成!
附件包含CrackMe及注册机。
搜了下关键词论坛好像不少这题的算法分析:
练习笔记之160Crackme-007
https://www.52pojie.cn/thread-1629880-1-1.html
160个crackme-007注册机编写
https://www.52pojie.cn/thread-1496557-1-1.html
160个Crackme007之分析思路和注册算法分析详解
https://www.52pojie.cn/thread-1131694-1-1.html
160 crackme 之 007
https://www.52pojie.cn/thread-1352537-1-1.html
探讨crackMe160之007中破解问题
https://www.52pojie.cn/thread-488516-1-1.html
Hmily 发表于 2022-10-12 16:30
搜了下关键词论坛好像不少这题的算法分析:
练习笔记之160Crackme-007
谢谢大大关注,新160个CrackMe是有人重新整理过的,换掉了原版160 CrackMe中的一些题目,这题就是被换掉的,和你链接里那些都不一样,应该本论坛没有人分析过,新160的题目来自这里:https://www.zhihu.com/people/wanao-meng-tian/zvideos 学习了,很有帮助的{:1_918:} 谢谢提供分享好好学习一下 谢谢分享,收藏备用 学习了,受益匪浅 学习了,很有帮助的 支持一下 lies2014 发表于 2022-10-12 16:57
谢谢大大关注,新160个CrackMe是有人重新整理过的,换掉了原版160 CrackMe中的一些题目,这题就是被换掉 ...
论坛应该都是来自这里
【反汇编练习】160个CrackME索引目录1~160建议收藏备用
https://www.52pojie.cn/thread-709699-1-1.html
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