PYG的一个CrackMe算法分析(附注算机源码)

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PYG的一个CrackMe算法分析(附注算机源码)

作者:佚名时间:2006-12-14 21:09 出处:pediy.com 责编:月夜寒箫

摘要：PYG的一个CrackMe算法分析(附注算机源码)

【文章标题】: PYG的一个CrackMe算法分析(附注算机源码)
【文章作者】: vxin
【软件名称】: CrackMe No.7.exe
【下载地址】: PYG
【作者声明】: 失误之处敬请诸位大侠赐教!
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【详细过程】

1、很少写算法分析,有些不知所云.见谅.^-^

2、此CM加了壳---ASPack 2.12  　ESP定律脱之（略）

3、此CM是　Microsoft Visual Basic 5.0 / 6.0　编写的

4、下断  bp __vbaStrComp

00407F4F            50             push eax
00407F50            FF51 20        call dword ptr ds:[ecx+20]         ; 取硬件ID
00407F53            3BC7           cmp eax,edi                        ; 2操作数相减，进行比较
00407F55            DBE2           fclex
00407F57            7D 15          jge short 14B0.00407F6E            ; 跳至 00407f7e
00407F59            8B8D 60FFFFFF  mov ecx,dword ptr ss:[ebp-A0]
00407F5F            6A 20          push 20
00407F61            68 38774000    push 14B0.00407738
00407F66            51             push ecx
00407F67            50             push eax
00407F68            FF15 4C104000  call dword ptr ds:[<&msvbvm60.__vb>; msvbvm60.__vbaHresultCheckObj
00407F6E            8B85 58FFFFFF  mov eax,dword ptr ss:[ebp-A8]      ; ss:[ebp-A8]移入eax
00407F74            8D95 44FFFFFF  lea edx,dword ptr ss:[ebp-BC]      ; ss:[ebp-BC]传送edx
00407F7A            8D4D 84        lea ecx,dword ptr ss:[ebp-7C]      ; ss:[ebp-7C]传送ecx
00407F7D            89BD 58FFFFFF  mov dword ptr ss:[ebp-A8],edi      ; ss:[0012F460]=0016F7E4　IC25N040ATMR04-0
00407F83            8985 4CFFFFFF  mov dword ptr ss:[ebp-B4],eax      ; eax移ss:[ebp-B4]
00407F89            C785 44FFFFFF >mov dword ptr ss:[ebp-BC],8        ; ss:[ebp-Bc]=8
00407F93            FFD6           call esi
00407F95            8D8D 5CFFFFFF  lea ecx,dword ptr ss:[ebp-A4]      ; ss:[ebp-A4]传ecx
00407F9B            FF15 70114000  call dword ptr ds:[<&msvbvm60.__vb>; msvbvm60.__vbaFreeStr
00407FA1            8B35 F4104000  mov esi,dword ptr ds:[<&msvbvm60._>; msvbvm60.__vbaVarCat
00407FA7            8D95 44FEFFFF  lea edx,dword ptr ss:[ebp-1BC]     ; ss:[ebp-1BC]入edx
00407FAD            8D45 84        lea eax,dword ptr ss:[ebp-7C]
00407FB0            52             push edx                           ; 压栈
00407FB1            8D8D 44FFFFFF  lea ecx,dword ptr ss:[ebp-BC]
00407FB7            50             push eax
00407FB8            51             push ecx
00407FB9            C785 4CFEFFFF >mov dword ptr ss:[ebp-1B4],14B0.00>
00407FC3            C785 44FEFFFF >mov dword ptr ss:[ebp-1BC],8
00407FCD            FFD6           call esi
00407FCF            50             push eax
00407FD0            FF15 1C104000  call dword ptr ds:[<&msvbvm60.__vb>; msvbvm60.__vbaStrVarMove
00407FD6            8BD0           mov edx,eax                        ; eax=0016A50C, (UNICODE "IC25N040ATMR04-0")
00407FD8            8D8D 5CFFFFFF  lea ecx,dword ptr ss:[ebp-A4]      ; ecx=0
00407FDE            FF15 58114000  call dword ptr ds:[<&msvbvm60.__vb>; msvbvm60.__vbaStrMove
00407FE4            8D95 5CFFFFFF  lea edx,dword ptr ss:[ebp-A4]      ; ss:[ebp-A4]传edx = IC25N040ATMR04-0
00407FEA            52             push edx                           ; 入栈
00407FEB            E8 100B0000    call 14B0.00408B00                 ; md5算法
00407FF0            8D95 34FFFFFF  lea edx,dword ptr ss:[ebp-CC]      ; ss:[ebp-CC]入edx
00407FF6            8D4D B8        lea ecx,dword ptr ss:[ebp-48]      ; ecx=ss:[ebp-48]
00407FF9            8985 3CFFFFFF  mov dword ptr ss:[ebp-C4],eax      ; eax=725D829A7B70514430E40320F795B2DC
00407FFF            C785 34FFFFFF >mov dword ptr ss:[ebp-CC],8
00408009            FF15 10104000  call dword ptr ds:[<&msvbvm60.__vb>; msvbvm60.__vbaVarMove
0040800F            8D8D 5CFFFFFF  lea ecx,dword ptr ss:[ebp-A4]
00408015            FF15 70114000  call dword ptr ds:[<&msvbvm60.__vb>; msvbvm60.__vbaFreeStr
0040801B            8D8D 44FFFFFF  lea ecx,dword ptr ss:[ebp-BC]
00408021            FF15 18104000  call dword ptr ds:[<&msvbvm60.__vb>; msvbvm60.__vbaFreeVar
00408027            8D85 74FFFFFF  lea eax,dword ptr ss:[ebp-8C]
0040802D            8D8D 44FEFFFF  lea ecx,dword ptr ss:[ebp-1BC]
00408033            50             push eax
00408034            51             push ecx
00408035            C785 4CFEFFFF >mov dword ptr ss:[ebp-1B4],6
0040803F            C785 44FEFFFF >mov dword ptr ss:[ebp-1BC],8002
00408049            FF15 50114000  call dword ptr ds:[<&msvbvm60.__vb>; msvbvm60.__vbaVarTstGe
0040804F            66:85C0        test ax,ax
00408052            0F84 1C030000  je 14B0.00408374
00408058            8D95 44FFFFFF  lea edx,dword ptr ss:[ebp-BC]
0040805E            8D45 B8        lea eax,dword ptr ss:[ebp-48]
00408061            52             push edx
00408062            6A 1B          push 1B
00408064            8D8D 34FFFFFF  lea ecx,dword ptr ss:[ebp-CC]
0040806A            50             push eax
0040806B            51             push ecx
0040806C            C785 4CFFFFFF >mov dword ptr ss:[ebp-B4],6        ; 堆栈 ss:[0012F454]=0016A50C, (UNICODE "IC25N040ATMR04-0")
00408076            C785 44FFFFFF >mov dword ptr ss:[ebp-BC],2
00408080            FF15 74104000  call dword ptr ds:[<&msvbvm60.rtcM>; msvbvm60.rtcMidCharVar
00408086            8D95 34FFFFFF  lea edx,dword ptr ss:[ebp-CC]
0040808C            8D85 24FFFFFF  lea eax,dword ptr ss:[ebp-DC]
00408092            52             push edx
00408093            50             push eax
00408094            FF15 38104000  call dword ptr ds:[<&msvbvm60.rtcL>; msvbvm60.rtcLowerCaseVar
0040809A            B8 02000000    mov eax,2
0040809F            8D8D E4FEFFFF  lea ecx,dword ptr ss:[ebp-11C]
004080A5            8985 E4FEFFFF  mov dword ptr ss:[ebp-11C],eax
004080AB            8985 24FEFFFF  mov dword ptr ss:[ebp-1DC],eax
004080B1            8D55 B8        lea edx,dword ptr ss:[ebp-48]
004080B4            51             push ecx
004080B5            8D85 04FFFFFF  lea eax,dword ptr ss:[ebp-FC]
004080BB            52             push edx
004080BC            50             push eax
004080BD            C785 3CFEFFFF >mov dword ptr ss:[ebp-1C4],14B0.00>; 连接符：-

..................................略N行................................

0004081A7            50             push eax
004081A8            8D8D B4FEFFFF  lea ecx,dword ptr ss:[ebp-14C]     ; ecx=ss:[ebp-14c]
004081AE            51             push ecx                           ; 入栈
004081AF            FFD6           call esi
004081B1            50             push eax
004081B2            8D55 CC        lea edx,dword ptr ss:[ebp-34]
004081B5            8D85 A4FEFFFF  lea eax,dword ptr ss:[ebp-15C]
004081BB            52             push edx
004081BC            50             push eax
004081BD            FFD6           call esi
004081BF            8D8D F4FDFFFF  lea ecx,dword ptr ss:[ebp-20C]
004081C5            50             push eax
004081C6            8D95 94FEFFFF  lea edx,dword ptr ss:[ebp-16C]
004081CC            51             push ecx
004081CD            52             push edx
004081CE            FFD6           call esi
004081D0            50             push eax
004081D1            8D85 64FEFFFF  lea eax,dword ptr ss:[ebp-19C]     ; eax=ss:[ebp-19c]
004081D7            8D8D 54FEFFFF  lea ecx,dword ptr ss:[ebp-1AC]
004081DD            50             push eax
004081DE            51             push ecx
004081DF            FFD6           call esi
004081E1            50             push eax
004081E2            FF15 1C104000  call dword ptr ds:[<&msvbvm60.__vb>; F7跟进
004081E8            8BD0           mov edx,eax                        ; eax=0016A50C, (UNICODE "95b2dc-795B-joe-lu-a7b70514")
004081EA            8D4D 94        lea ecx,dword ptr ss:[ebp-6C]
004081ED            FF15 58114000  call dword ptr ds:[<&msvbvm60.__vb>; msvbvm60.__vbaStrMove

====================================================算法=======================================================
6A2A540D msvbvm60>  56             push esi                           ; 压栈
6A2A540E            8B7424 08      mov esi,dword ptr ss:[esp+8]       ; ss:[esp+8]入esi
6A2A5412            66:833E 08     cmp word ptr ds:[esi],8            ; 两数进行相减,进行比较
6A2A5416            0F85 FF140200  jnz msvbvm60.6A2C691B
6A2A541C            66:8326 00     and word ptr ds:[esi],0            ; 逻辑与运算
6A2A5420            8B46 08        mov eax,dword ptr ds:[esi+8]       ; 堆栈 ds:[0012F364]=0016A50C, (UNICODE "95b2dc-795B-joe-lu-a7b70514")
6A2A5423            5E             pop esi                            ; msvbvm60.__vbaVarCat
6A2A5424            C2 0400        retn 4

===================================================================================================
算法总结：

1、取硬件ID＝IC25N040ATMR04-0   设为 CodeA

2、硬件ID（IC25N040ATMR04-0）MD5加密＝725D829A7B70514430E40320F795B2DC 设为 CodeB

3、重新分解CodeB=　95B2DC(code1) ＋ 795B(code2)　＋用户名＋a7b70514(code3)

注册机：

procedure TForm1.Button1Click(Sender: TObject);
var code1,code2,code3:string;
begin
   if length(Edit_Name.Text)>5 then
   begin
   code1:=RightStr(MD5Print(MD5String(Edit_ID.text)),6);
   Code2:=RightStr(MD5Print(MD5String(Edit_ID.text)),7);
   Code2:=LeftStr(code2,4);
   Code3:=copy(MD5Print(MD5String(Edit_ID.text)),7,9);
   Edit_No.Text:=(code1+'-'+code2+'-'+Edit_Name.Text+'-'+code3);
   end;
end;

所上传文件

crackme no.7.rar (上传时间2006-10-11,10:28,49.1 KB,32 次点击)

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