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[旧帖] [分享] 初探 vmp 0.00雪花
发表于: 2013-2-24 06:29 3384

[旧帖] [分享] 初探 vmp 0.00雪花

2013-2-24 06:29
3384

本人新菜

最近研究了一小段vmp的代码 做了一点分析还请各位大牛多多指教 有什么不对的地方请各位大牛发帖纠正 废话不多说

以下为 vmp createfileW 返回后的一小段跟踪和分析

handler --> 006FE85B  vPopReg4
pop reg[10] FFFFFFFF  vESP --> 12F760 = 8EC31C        reg[10] = 7c Createfile

handler --> 006FC9F4  vPushImm4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057      push 立即数 E64A6057

handler --> 006FC9F4  vPushImm4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057 
                      vESP --> 12F758 = E644A83E      push 立即数 E644A83E 

handler --> 006FDD64  vPushImmSx1
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057 
                      vESP --> 12F758 = E644A83E
                      vESP --> 12F754 = FFFFFFFF      push cwde 立即数 FF

handler --> 006FC8CE  vPushReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057 
                      vESP --> 12F758 = E644A83E
                      vESP --> 12F754 = FFFFFFFF
PUSH reg[10] 7c       vESP --> 12F750 = 7c            PUSH reg[10] = 7c CreateFile  

handler --> 006FC8CE  vPushReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057 
                      vESP --> 12F758 = E644A83E
                      vESP --> 12F754 = FFFFFFFF
                      vESP --> 12F750 = 7c 
PUSH reg[10] 7c       vESP --> 12F74C = 7c            PUSH reg[10] = 7c CreateFile  

handler --> 006FE99D  vNand4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057 
                      vESP --> 12F758 = E644A83E
                      vESP --> 12F754 = FFFFFFFF
                      vESP --> 12F750 = FFFFFF83      nand4_01 = FFFFFF83 = nand(CreateFile) 
                      vESP --> 12F74C = 282           vesp = efl 282

handler --> 006FE85B  vPopReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057 
                      vESP --> 12F758 = E644A83E
                      vESP --> 12F754 = FFFFFFFF
                      vESP --> 12F750 = FFFFFF83                     
pop reg[38] 282                                       清除 reg[38] 中的 CreateFile 
                                                      reg[10] = nand4_01 efl 282                                    
 

handler --> 006FEA7D  vAdd4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057 
                      vESP --> 12F758 = E644A83E
                      vESP --> 12F754 = FFFFFF82      add_ImmSx1 = FFFFFF82 = ImmSx1+nand4_01
                      vESP --> 12F750 = 297           vesp = efl 297

handler --> 006FE85B  vPopReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057 
                      vESP --> 12F758 = E644A83E
                      vESP --> 12F754 = FFFFFF82
pop reg[28] 297                                       reg[28] = add_ImmSx1 efl 297                                 

handler --> 006FDF50  vPushVEsp
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057 
                      vESP --> 12F758 = E644A83E
                      vESP --> 12F754 = FFFFFF82
                      vESP --> 12F750 = 0012F754

handler --> 006FD949  vReadMemSs4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057 
                      vESP --> 12F758 = E644A83E
                      vESP --> 12F754 = FFFFFF82
                      vESP --> 12F750 = FFFFFF82      push FFFFFF82 = add_ImmSx1

handler --> 006FE99D  vNand4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E
                      vESP --> 12F754 = 7d            nand4_02 = 7d = nand4(add_ImmSx1)
                      vESP --> 12F750 = 206           vesp = efl 206

handler --> 006FE85B  vPopReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E
                      vESP --> 12F754 = 7d
pop reg[14] 206                                       reg[14] = nand4_02 efl 206              

handler --> 006FE85B  vPopReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E                      
pop reg[2c] 7d                                         reg[2c] = 7d = nand4_02                  

handler --> 006FC8CE  vPushReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E                      
push reg[28] 297      vESP --> 12F754 = 297           reg[28] = add_ImmSx1 efl 297        

handler --> 006FC8CE  vPushReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E                      
                      vESP --> 12F754 = 286 
push reg[28] 297      vESP --> 12F750 = 286           reg[28] = add_ImmSx1 efl 297  

handler --> 006FE99D  vNand4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E                      
                      vESP --> 12F754 = FFFFFD68      nand4_03 = FFFFFD68 = nand4(add_ImmSx1 efl)
                      vESP --> 12F750 = 282

handler --> 006FE85B  vPopReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E                      
                      vESP --> 12F754 = FFFFFD68 
pop reg[3c] 282                                       reg[3c] = nand4_03 efl 282

handler --> 006FE209  vPushImmSx2
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E                      
                      vESP --> 12F754 = FFFFFD68 
                      vESP --> 12F750 = FFFFF7EA      push 立即数 F7EA

handler --> 006FE99D  vNand4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E                      
                      vESP --> 12F754 = 15             nand4_04 = 15 = nand4(nand4_03,立即数 F7EA)
                      vESP --> 12F750 = 202

handler --> 006FE85B  vPopReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E                      
                      vESP --> 12F754 = 15 
pop reg[38] 202                                       reg[38] = nand4_04 efl 202

handler --> 006FC8CE  vPushReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E                      
                      vESP --> 12F754 = 15 
push reg[14] 206      vESP --> 12F750 = 206           push reg[14] = nand4_02 efl 206 

handler --> 006FDF50  vPushVEsp
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E                      
                      vESP --> 12F754 = 15 
                      vESP --> 12F750 = 206
                      vESP --> 12F74c = 12F750                 

handler --> 006FD949  vReadMemSs4                     
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E                      
                      vESP --> 12F754 = 15 
                      vESP --> 12F750 = 206
                      vESP --> 12F74c = 206            push reg[14] = nand4_02 efl 206

handler --> 006FE99D  vNand4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E                      
                      vESP --> 12F754 = 15 
                      vESP --> 12F750 = FFFFFDF9       nand4_05 = FFFFFDF9 = nand4(nand4_02 efl)
                      vESP --> 12F74c = 286

handler --> 006FE85B  vPopReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E                      
                      vESP --> 12F754 = 15 
                      vESP --> 12F750 = FFFFFDF9
pop reg[18] 286                                        reg[18] = nand4_05 efl 286

handler --> 006FE209  vPushImmSx2
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E                      
                      vESP --> 12F754 = 15 
                      vESP --> 12F750 = FFFFFDB9
                      vESP --> 12F74c = 815            push 立即数 815      

handler --> 006FE99D  vNand4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E                      
                      vESP --> 12F754 = 15 
                      vESP --> 12F750 = 202            nand4_06 = nand4(立即数 815,nand4_05)       
                      vESP --> 12F74c = 202

handler --> 006FE85B  vPopReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E                      
                      vESP --> 12F754 = 15 
                      vESP --> 12F750 = 202
pop reg[38] 202                                        清除 reg[38] 中的 nand4_04 efl
                                                       reg[38] = nand4_06 efl 202

handler --> 006FEA7D  vAdd4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E                      
                      vESP --> 12F754 = 217           add_nand4_06 = 217 = nand4_06 + nand4_04
                      vESP --> 12F750 = 206

handler --> 006FE85B  vPopReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E                      
                      vESP --> 12F754 = 217
pop reg[38] 206                                       清除 reg[38] 中的 nand4_04 efl
                                                      reg[38] = add_nand4_06 efl 206

handler --> 006FE85B  vPopReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E                      
pop reg[2c] 217                                       清除 reg[2c] 中的 nand4_02  
                                                      reg[2c] = add_nand4_06                             

handler --> 006FDF50  vPushVEsp
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E 
                      vESP --> 12F754 = 0012F758 

handler --> 006FDEAF  vPushImm1
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E 
                      vESP --> 12F754 = 12F758 
                      vESP --> 12F752 = 0004          push 立即数 4  (栈转换位2字节形式  push dword mov [vesp+2],imm)

handler --> 006FDD64  vPushImmSx1                                     
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E 
                      vESP --> 12F754 = 12F758 
                      vESP --> 12F752 = 0004
                      vESP --> 12F74E = FFFFFFBF      pushd 立即数 BF

handler --> 006FC8CE  vPushReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E 
                      vESP --> 12F754 = 12F758 
                      vESP --> 12F752 = 0004
                      vESP --> 12F74E = FFFFFFBF
push reg[2c] 217      vESP --> 12F74A = 217           push reg[2c] 217 = add_nand4_06       

handler --> 006FE99D  vNand4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E 
                      vESP --> 12F754 = 12F758 
                      vESP --> 12F752 = 0004
                      vESP --> 12F74c = 40            nand4_07 = 40 = nand4(add_nand4_06,立即数 BF)     
                      vESP --> 12F74A = 202

handler --> 006FE85B  vPopReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E 
                      vESP --> 12F754 = 12F758 
                      vESP --> 12F752 = 4
                      vESP --> 12F74c = 40
pop reg[28] 202                                       清除 reg[28] 中的 add_ImmSx1 efl 246
                                                      reg[28] = nand4_07 efl 202

handler --> 006FE2C4  vShr4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E 
                      vESP --> 12F754 = 12F758 
                      vESP --> 12F750 = 0004
shr [vesp],[vESP+4]   vESP --> 12F74c = 202          栈转换为4字节形式 

handler --> 006FE85B  vPopReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E 
                      vESP --> 12F754 = 12F758 
                      vESP --> 12F750 = 0004          
pop reg[18] 202                                       清除 reg[18] 中的 nand4_05 efl 282                                    
                                                      reg[18] = vshr efl 246
  
handler --> 006FEA7D  vAdd4 **************************************
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E 
                      vESP --> 12F754 = 12F75c        
                      vESP --> 12F750 = 202                    

handler --> 006FE85B  vPopReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E 
                      vESP --> 12F754 = 12F75c 
pop reg[3c] 202                                       清除 reg[3c] 中的 nand4_03 efl 282                                  
                                                      reg[3c] = 202

handler --> 006FD949  vReadMemSs4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E   
                      vESP --> 12F754 = E64A6057      mov [vesp], 立即数 E64A6057       

handler --> 006FE85B  vPopReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
                      vESP --> 12F758 = E644A83E 
pop reg[3c] E64A6057                                  清除 reg[3c] 中的 202                                 
                                                      reg[3c] = 立即数 E64A6057                          

handler --> 006FE85B  vPopReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75C = E64A6057
pop reg[38] E644A83E                                  清除 reg[38] 中的 add_nand4_06 efl 202                                
                                                      reg[38] = 立即数 E644A83E  
handler --> 006FE85B  vPopReg4
                      vESP --> 12F760 = 8EC31C
pop reg[4] E64A6057                                   reg[4] = 立即数 E64A6057                               

handler --> 006FC8CE  vPushReg4
                      vESP --> 12F760 = 8EC31C
push reg[3c] E64A6057 vESP --> 12F75c = E64A6057      push 立即数 E64A6057
                  
handler --> 006FE85B  vPopReg4
                      vESP --> 12F760 = 8EC31C
pop reg[38] E64A6057                                  清除 reg[38] 中的 立即数 E64A6057                              
                                                      reg[38] = 立即数 E64A6057 

handler --> 006FC8CE  vPushReg4
                      vESP --> 12F760 = 8EC31C
push reg[38] E64A6057 vESP --> 12F75c = E64A6057      push 立即数 E64A6057  

handler --> 006FC8CE  vPushReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75c = E644A83E
push reg[38] E64A6057 vESP --> 12F758 = E64A6057      push 立即数 E64A6057

handler --> 006FE99D  vNand4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75c = 19B59FA8      nand4_08 = nand4(立即数 E64A6057)   
                      vESP --> 12F758 = 202       

handler --> 006FE85B  vPopReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75c = 19B59FA8
pop reg[4] 202                                        清除 reg[4] 中的 立即数 E64A6057
                                                      reg[4] = nand4_08 efl 202

handler --> 006FC9F4  vPushImm4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75c = 19BB57C1
                      vESP --> 12F758 = 19DAC2D7      push 立即数 19DAC2D7   

handler --> 006FE99D  vNand4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75c = E6002000      nand4_09 = nand4(立即数 19DAC2D7,nand4_08)
                      vESP --> 12F758 = 286

handler --> 006FE85B  vPopReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75c = E6042828
pop reg[18] 286                                       清除 reg[18] 中的 0
                                                      reg[18] = nand4_09 efl 286

handler --> 006FC8CE  vPushReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75c = E6002000
push reg[38] E64A6057 vESP --> 12F758 = E64A6057      push 立即数 E64A6057  

handler --> 006FC9F4  vPushImm4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75c = E6002000
                      vESP --> 12F758 = E64A6057
                      vESP --> 12F754 = E6253D28      push 立即数 E6253D28

handler --> 006FE99D  vNand4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75c = E6002000
                      vESP --> 12F758 = 19908280      nand4_10 = nand4(reg[38]立即数 19DAC2D7,立即数 E644A83E)
                      vESP --> 12F754 = 202

handler --> 006FE85B  vPopReg4
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75c = E6002000
                      vESP --> 12F758 = 19908280
pop reg[18] 202                                       清除 reg[18] 中的 nand4_09 efl 202
                                                      reg[18] = nand4_10 efl 202

handler --> 006FE99D  vNand4 ********************************************************************
                      vESP --> 12F760 = 8EC31C
                      vESP --> 12F75c = 006F5D7F        jmp_addr = nand4_11 = nand4(nand4_10,nand4_09)
                      vESP --> 12F758 = 202

**********************************************************************************************************************************
以下为代码总结

                               nand4_01 = FFFFFF83 = nand(7C = CreateFile)
                    
add_ImmSx1 = FFFFFF82 = FFFFFFFF + nand4_01            nand4_02 = 7d = nand4(add_ImmSx1)

add_ImmSx1 efl 297 (相对固定值)                         nand4_02 efl 206 (相对固定值) 

////////////////////////////////////////////////////   //////////////////////////////////////////////////////////
//                                                //   //                                                      //
//    add_ImmSx1 efl 297 & 815                    //   //    nand4_02 efl 206 & ~815                           //
//                                                //   //                                                      //
////////////////////////////////////////////////////   //////////////////////////////////////////////////////////                                      
//                                                //   //                                                      //
//   nand4_03 = FFFFFD68 = nand4(add_ImmSx1 efl)  //   //    nand4_05 = FFFFFDF9 = nand4(nand4_02 efl)         //
//                                                //   //                                                      //
//   nand4_04 = 15 = nand4(nand4_03,FFFFF7EA)     //   //    nand4_06 = nand4(立即数 815,nand4_05)             //
//                                                //   //                                                      //
////////////////////////////////////////////////////   //////////////////////////////////////////////////////////                             
                             
                            /////////////////////////////////////////////////////////
                            //                                                     //
                            //     add_nand4_06 = 217 = nand4_06 + nand4_04        //
                            //                                                     //
                            //     add_nand4_06 = (297 & 815) + (206 & ~815)       //
                            //                                                     //
                            /////////////////////////////////////////////////////////
                          
                    (判断标志位) nand4_07 = 40 = nand4(add_nand4_06,FFFFFFBF)
                                 
                                 shr nand4_07,4 (nand4_07 右移4位 = 4)

                                 此时 [[vESP]] 为加密的vJmp地址A [[vESP]+ 4]  为加密的vJmp地址B 
                                      
                                 add [vESP],nand4_07  ([vESP] + 4) 选择加密的跳转地址

                                 nand4_08 = nand4(加密的vJmp) 

                                 nand4_09 = nand4(立即数 KEY1,nand4_08)

                                 nand4_10 = nand4(立即数 KEY2,加密的vJmp)

                                 jmp_addr = nand4_11 = nand4(nand4_10,nand4_09)

小弟刚刚入门开始逆向 还请各位大牛多多指教


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雪    币: 22
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以上vmp版本为 2.09
2013-2-24 06:31
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雪    币: 166
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佩服楼主的耐心
2013-2-24 13:21
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佩服楼主的耐心
2013-2-24 14:06
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雪    币: 22
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此段稍加修改可以饶过vmp的内存效验 目前只想到修改 拦截 createfileW 修改返回值 或者替换key 和 替换 vjmp地址 来实现饶过效验 因为还有 虚拟机效验没有去除所以不能强行修改虚拟指令
请各位大牛指点方法或思路
2013-2-24 14:42
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雪    币: 80
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谢谢你的整理  
网上有个 爆破VMP 2.06加壳程序.exe 的视频 你百度一下 希望对你有所帮助
2013-2-24 22:02
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楼主,如果遇到多指令的VMP你这样的脚本我想要跑大半天吧
2014-9-23 23:14
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