Slam!注册保护算法的分析
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软件名称: Slam!seeker1.0汉化版
工具:pw32dasmgold,Hiew32,trw2000.
这是个16位的软件,比较古老了点.所以pw32dasmgold反汇编代码看上去不太习惯.
**************************************************************************************
**************************************************************************************
运行后弹出一个注册框,随便输入注册码,trw2000设断bpx GETDLGITEMTEXT.
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0001.8510(C)
|
:0001.8518 8B760E mov si, [bp+0E]
:0001.851B 56 push si
* Possible Ref to Menu: WSLAMMENU, Item: "新游戏(N)"
|
:0001.851C 6A64 push 0064
:0001.851E 1E push ds
:0001.851F 68302E push 2E30
:0001.8522 6A40 push 0040
:0001.8524 9AFFFF0000 call USER.GETDLGITEMTEXT ---读入注册码
:0001.8529 803E302E00 cmp byte ptr [2E30], 00 ---是否为空
:0001.852E 7428 je 8558 ----空则跳offset:8B4E
:0001.8530 E829FF call 845C ----注册码检测的call
:0001.8533 0BC0 or ax, ax
:0001.8535 7521 jne 8558
----可以跳过853F的MESSAGEBOX,用Hiew32改为je,仅是使输入任意错误注册码都不弹出失败提示框.
:0001.8537 56 push si
:0001.8538 1E push ds
:0001.8539 680808 push 0808
:0001.853C 50 push ax
:0001.853D 50 push ax
:0001.853E 50 push ax
:0001.853F 9AEE110000 call USER.MESSAGEBOX ----弹出"无效注册码"
:0001.8544 C606302E00 mov byte ptr [2E30], 00
:0001.8549 56 push si
* Possible Ref to Menu: WSLAMMENU, Item: "新游戏(N)"
|
:0001.854A 6A64 push 0064
:0001.854C 1E push ds
:0001.854D 68302E push 2E30
:0001.8550 9AFFFF0000 call USER.SETDLGITEMTEXT
:0001.8555 EBAC jmp 8503
**************************************************************************************
**************************************************************************************
16位的软件,怪异,试试去掉nag,注册框nag是个DIALOGBOX
由pw32dasmgold反汇编知有三处代码调用了USER.DIALOGBOX,如下:
第一处:
* Referenced by a (U)nconditional or (C)onditional Jump at Addresses:
|:0001.0928(U), :0001.09D0(U)
|
:0001.088C FF760E push word ptr [bp+0E]
:0001.088F 52 push dx
:0001.0890 50 push ax
:0001.0891 8BFA mov di, dx
:0001.0893 9ADE080000 call USER.DIALOGBOX
:0001.0898 57 push di
:0001.0899 56 push si
:0001.089A 9AEA080000 call KERNEL.FREEPROCINSTANCE
第二处:
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0001.0816(C)
|
:0001.08B0 C7060A130100 mov word ptr [130A], 0001
:0001.08B6 680D09 push SEG ADDR of Segment 0001
:0001.08B9 681A14 push 141A
:0001.08BC FF36B812 push word ptr [12B8]
:0001.08C0 9A17090000 call KERNEL.MAKEPROCINSTANCE
:0001.08C5 8956FC mov [bp-04], dx
:0001.08C8 FF36B812 push word ptr [12B8]
:0001.08CC 1E push ds
* Possible Reference to Dialog: ANGLEBOX
|
:0001.08CD 687202 push 0272
:0001.08D0 FF760E push word ptr [bp+0E]
:0001.08D3 52 push dx
:0001.08D4 50 push ax
:0001.08D5 89863AFF mov [bp+FF3A], ax
:0001.08D9 89963CFF mov [bp+FF3C], dx
:0001.08DD 9AFFFF0000 call USER.DIALOGBOX
:0001.08E2 8BF8 mov di, ax
:0001.08E4 66FFB63AFF push word ptr [bp+FF3A]
:0001.08E9 9AFFFF0000 call KERNEL.FREEPROCINSTANCE
:0001.08EE 0BFF or di, di
:0001.08F0 74AD je 089F
:0001.08F2 FF760E push word ptr [bp+0E]
:0001.08F5 666800000500 push 00050000
* Possible Reference to Dialog: REGISTRATIONINFO, CONTROL_ID:00FF, ""
|
:0001.08FB 666AFF push FFFFFFFF
:0001.08FE 9A6B020000 call USER.POSTMESSAGE
:0001.0903 EB9A jmp 089F
第三处:
* Referenced by a CALL at Address:
|:0001.0F47
|
:0001.8572 C8040000 enter 0004, 00
:0001.8576 57 push di
:0001.8577 56 push si
:0001.8578 1E push ds
* Possible StringData Ref from Data Seg 002 ->"Wslam"
|
:0001.8579 683308 push 0833
:0001.857C 1E push ds
* Possible StringData Ref from Data Seg 002 ->"RegisID"
|
:0001.857D 682B08 push 082B
:0001.8580 1E push ds
:0001.8581 682A08 push 082A
:0001.8584 1E push ds
:0001.8585 68302E push 2E30
:0001.8588 6A40 push 0040
:0001.858A 1E push ds
* Possible StringData Ref from Data Seg 002 ->"wslam.ini"
|
:0001.858B 682008 push 0820
:0001.858E 9A4F160000 call KERNEL.GETPRIVATEPROFILESTRING
:0001.8593 E8C6FE call 845C ----注册码检测的call
:0001.8596 0BC0 or ax, ax
:0001.8598 7548 jne 85E2
----这个跳转可以跳过,offset:8BB8,用Hiew32改为je,一运行,爆破成功!去掉了注册框.
:0001.859A 683C5D push SEG ADDR of Segment 0001
:0001.859D 68E884 push 84E8
:0001.85A0 FF36B812 push word ptr [12B8]
:0001.85A4 9A465D0000 call KERNEL.MAKEPROCINSTANCE
----这儿下断点bpx MAKEPROCINSTANCE就能拦到下面那个弹出注册框的DIALOGBOX.
:0001.85A9 8BF0 mov si, ax
:0001.85AB FF36B812 push word ptr [12B8]
:0001.85AF 1E push ds
* Possible Reference to Dialog: REGISTRATIONINFO
|
:0001.85B0 683908 push 0839
:0001.85B3 FF7604 push word ptr [bp+04]
:0001.85B6 52 push dx
:0001.85B7 50 push ax
:0001.85B8 8BFA mov di, dx
:0001.85BA 9A94080000 call USER.DIALOGBOX ---向上看有无跳过的地方.
:0001.85BF 57 push di
:0001.85C0 56 push si
:0001.85C1 9AD25D0000 call KERNEL.FREEPROCINSTANCE
:0001.85C6 E893FE call 845C
:0001.85C9 0BC0 or ax, ax
:0001.85CB 7415 je 85E2
:0001.85CD 1E push ds
* Possible StringData Ref from Data Seg 002 ->"Wslam"
|
:0001.85CE 685C08 push 085C
:0001.85D1 1E push ds
* Possible StringData Ref from Data Seg 002 ->"RegisID"
|
:0001.85D2 685408 push 0854
:0001.85D5 1E push ds
:0001.85D6 68302E push 2E30
:0001.85D9 1E push ds
* Possible StringData Ref from Data Seg 002 ->"wslam.ini"
|
:0001.85DA 684A08 push 084A
:0001.85DD 9A375E0000 call KERNEL.WRITEPRIVATEPROFILESTRING
-----------------------------------------------------------------------------
然后用trw2000拦截DIALOGBOX,设断bpx DIALOGBOX,试探各DIALOGBOX的作用.
:0001.0891 8BFA mov di, dx
:0001.0893 9ADE080000 call USER.DIALOGBOX 弹出菜单里的对话框.
:0001.85B8 8BFA mov di, dx
:0001.85BA 9A94080000 call USER.DIALOGBOX 弹出注册框.
:0001.08D9 89963CFF mov [bp+FF3C], dx
:0001.08DD 9AFFFF0000 call USER.DIALOGBOX 功能不明.
-----------------------------------------------------------------------------
注册算法分析
-----注册码检测call 845C如下:
(如需动态分析,trw2000设断bpx GETDLGITEMTEXT,pmodule返回既是)
* Referenced by a CALL at Addresses:
|:0001.8530, :0001.8593, :0001.85C6
----------------------------
三个地方调用了注册码检测call,
:0001.8530,作用为验证输入的注册码
:0001.8593,程序启动时,用来判断是否弹出注册对话框
:0001.85C6,第二次验证输入的注册码,类似双重保险.
----------------------------
:0001.845C C8220000 enter 0022, 00
:0001.8460 57 push di
:0001.8461 56 push si
:0001.8462 33D2 xor dx, dx
:0001.8464 8956FE mov [bp-02], dx ----bp-02地址处双字节清零
:0001.8467 BE302E mov si, 2E30 -----2E30处存放了注册码
:0001.846A 3814 cmp [si], dl ---判断注册码第一位是否为零
:0001.846C 7426 je 8494 ----为零则跳转
:0001.846E 8D7EDE lea di, [bp-22] ----bp-22的有效值给di
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0001.8492(C)
|-------下面是一个循环对注册码字符进行变换
:0001.8471 8D46FE lea ax, [bp-02] ----bp-02的有效值给ax
:0001.8474 3BF8 cmp di, ax ----比较di, ax
:0001.8476 731C jnb 8494 ----di>=ax则跳
:0001.8478 8A04 mov al , [si] ----注册码首字符ASCII码给al
:0001.847A 98 cbw ---CBW 字节转换为字. (把AL中字节的符号扩展到AH中去)
:0001.847B 8BD8 mov bx, ax ----符号扩展后的注册码首字符给bx
:0001.847D F687FD0804 test byte ptr [bx+08FD], 04
:0001.8482 740A je 848E
:0001.8484 98 cbw
:0001.8485 2D3000 sub ax, 0030 ----ax=ax-0030
:0001.8488 8905 mov [di], ax ----把ax赋给di所指地址处的值
:0001.848A 83C702 add di, 0002 ----di=di+0002
:0001.848D 42 inc dx
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0001.8482(C)
|
:0001.848E 46 inc si
:0001.848F 803C00 cmp byte ptr [si], 00 ----判断注册码处理完毕否
:0001.8492 75DD jne 8471 ----没完跳回继续循环
* Referenced by a (U)nconditional or (C)onditional Jump at Addresses:
|:0001.846C(C), :0001.8476(C)
|
:0001.8494 83FA10 cmp dx, 0010
----注册码位数与10(hex)即16(dec)比较,在这儿设断点bpx ****(每次运行不同):8494可拦下所有调用
:0001.8497 7C48 jl 84E1 ------<=10则跳过下面一大段,直接返回.
------下面的bp-**都是注册码(设为a[i])经过变换后的相应值(设为a[i]')
:0001.8499 8B46E0 mov ax, [bp-20] ----注册码第二位变换值a[1]'给ax
:0001.849C F76EEA imul word ptr [bp-16]---a[1]'=a[1]'*a[6]'
:0001.849F F76EF4 imul word ptr [bp-0C]---a[1]'=a[1]'*a[6]'*a[11]'
:0001.84A2 F76EF6 imul word ptr [bp-0A]---a[1]'=a[1]'*a[6]'*a[11]'*a[12]'
:0001.84A5 8BC8 mov cx, ax ---cx=ax=a[1]'*a[6]'*a[11]'*a[12]'
:0001.84A7 8B46E4 mov ax, [bp-1C] ----注册码第四位变换值a[3]'给ax
:0001.84AA F76EE6 imul word ptr [bp-1A]
:0001.84AD F76EF2 imul word ptr [bp-0E]
:0001.84B0 F76EF8 imul word ptr [bp-08]
:0001.84B3 03C8 add cx, ax
---cx=cx+ax=a[1]'*a[6]'*a[11]'*a[12]'+a[3]'*a[4]'*a[10]'*a[13]'
:0001.84B5 8B46EC mov ax, [bp-14] ----注册码第八位变换值a[7]'给ax
:0001.84B8 F76EEE imul word ptr [bp-12]
:0001.84BB F76EF0 imul word ptr [bp-10]
:0001.84BE F76EFC imul word ptr [bp-04]
:0001.84C1 03C8 add cx, ax
---cx=cx+ax=a[1]'*a[6]'*a[11]'*a[12]'+a[3]'*a[4]'*a[10]'*a[13]'+a[7]'*a[8]'*a[9]'*a[15]'
:0001.84C3 8B46E2 mov ax, [bp-1E] ----注册码第三位变换值a[2]'给ax
:0001.84C6 F76EE8 imul word ptr [bp-18]
:0001.84C9 F76EFA imul word ptr [bp-06]
:0001.84CC F76EDE imul word ptr [bp-22]
:0001.84CF 03C1 add ax, cx
---ax=cx+ax=a[1]'*a[6]'*a[11]'*a[12]'+a[3]'*a[4]'*a[10]'*a[13]'+a[7]'*a[8]'*a[9]'*a[15]'+a[2]'*a[5]'*a[14]'*a[0]'
* Possible Ref to Menu: WSLAMMENU, Item: "帮助(H)..."
|
:0001.84D1 B9F401 mov cx, 01F4 ----cx=01F4
:0001.84D4 99 cwd
:0001.84D5 F7F9 idiv cx
----------------------------------------------------
div 源（eax＝eax/源，edx＝余数）
IDIV 整数除法. 以上两条,结果回送:
商回送AL,余数回送AH, (字节运算);
或 商回送AX,余数回送DX, (字运算).
----------------------------------------------------
:0001.84D7 83FA7F cmp dx, 007F ----余数和007F比较
:0001.84DA 7505 jne 84E1 ----不相等则失败
关键比较,offset:8AFA,用Hiew32改为je,OK了!
:0001.84DC C746FE0100 mov word ptr [bp-02], 0001 ---注册标志位置入
* Referenced by a (U)nconditional or (C)onditional Jump at Addresses:
|:0001.8497(C), :0001.84DA(C)
|
:0001.84E1 8B46FE mov ax, [bp-02] ----ax存放注册标志位
:0001.84E4 5E pop si
:0001.84E5 5F pop di
:0001.84E6 C9 leave
:0001.84E7 C3 ret
总结:
注册码必须为16位
1.处理过程
[注册码ASCII码值+08FD]处值与04比较,不同则
注册码处理值=注册码ASCII码值-30(hex)
2.检验过程:
简化bp-**=**,所以bp-12下面写为12
22 20 1E 1C 1A 18 16 14 内存中的处理值
1 2 3 4 5 6 7 8 对应第i位注册码
a[0]' a[1]' a[2]' a[3]' a[4]' a[5]' a[6]' a[7]' 对应注册码处理值
12 10 0E 0C 0A 08 06 04
9 10 11 12 13 14 15 16
a[8]' a[9]' a[10]' a[11]' a[12]' a[13]' a[14]' a[15]'
令sum=a[1]'*a[6]'*a[11]'*a[12]'+a[3]'*a[4]'*a[10]'*a[13]'+a[7]'*a[8]'*a[9]'*a[15]'+a[2]'*a[5]'*a[14]'*a[0]'
sum%01F4与007F比较,相等则注册成功!
喜欢做注册机的话,就试试看吧!
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