1、识别乱序和花指令:
乱序指令:B xxxxx
花指令有两种:
a: PUSH.W {R4-R10,LR}
POP.W {R4-R10,LR}
b: PUSH {R0,R4,R5,R7,LR}
xxxxxxx
POP.W {R0,R4,R5,R7,LR}
知道特征后就可以写idc脚本进处理这些指令,然后得到正常的指令,脚本如下:
#include <idc.idc>
extern g_baseAddr;
extern g_addr;
extern g_startAddr;
extern g_endAddr;
extern g_nop;
extern g_patch;
//恢复指主函数
static GetJmpType(addr,type)
{
auto result = 0;
auto callAddr,r0,pc = 0;
auto funName = 0;
auto instructions = "";
auto instructionsAddr,instructionsSize;
auto tmpType = type;
if (g_endAddr >= addr && addr >= g_startAddr)
{
instructionsAddr = addr;
MakeCode((instructionsAddr & 0xFFFFFFFE));
instructions = GetDisasm(instructionsAddr);
//Message("%X: %s\n",instructionsAddr,instructions);
if(instructions == "NOP")
{
result = instructionsAddr + 2;
}
else if(instructions == "PUSH.W {R4-R10,LR}")
{
if (g_patch==1)PatchWord(instructionsAddr,g_nop);
MakeCode((instructionsAddr & 0xFFFFFFFE));
//Message("%X: %s\n",instructionsAddr,GetDisasm(instructionsAddr));
if (g_patch==1)PatchWord(instructionsAddr+2,g_nop);
MakeCode(((instructionsAddr+2) & 0xFFFFFFFE));
//Message("%X: %s\n",instructionsAddr+2,GetDisasm(instructionsAddr+2));
result = instructionsAddr + 4;
}
else if(instructions == "POP.W {R4-R10,LR}")
{
if (g_patch==1)PatchWord(instructionsAddr,g_nop);
MakeCode((instructionsAddr & 0xFFFFFFFE));
//Message("%X: %s\n",instructionsAddr,GetDisasm(instructionsAddr));
if (g_patch==1)PatchWord(instructionsAddr+2,g_nop);
MakeCode(((instructionsAddr+2) & 0xFFFFFFFE));
//Message("%X: %s\n",instructionsAddr+2,GetDisasm(instructionsAddr+2));
result = instructionsAddr + 4;
}
else if(instructions == "PUSH {R0,R4,R5,R7,LR}")
{
if (g_patch==1)PatchWord(instructionsAddr,g_nop);
MakeCode((instructionsAddr & 0xFFFFFFFE));
//Message("%X: %s\n",instructionsAddr,GetDisasm(instructionsAddr));
result = instructionsAddr + 2;
result = GetJmpType(result,1);
}
else if(instructions == "POP.W {R0,R4,R5,R7,LR}")
{
if (g_patch==1)PatchWord(instructionsAddr,g_nop);
MakeCode((instructionsAddr & 0xFFFFFFFE));
//Message("%X: %s\n",instructionsAddr,GetDisasm(instructionsAddr));
if (g_patch==1)PatchWord(instructionsAddr+2,g_nop);
MakeCode(((instructionsAddr+2) & 0xFFFFFFFE));
//Message("%X: %s\n",instructionsAddr+2,GetDisasm(instructionsAddr+2));
result = instructionsAddr + 4;
result = GetJmpType(result,0);
}
else if(substr(instructions,0,19) == "B loc")
{
//Message("%X: %s\n",instructionsAddr,instructions);
instructionsAddr = xtol(substr(instructions,strstr(instructions,"loc_")+4,-1));
result = instructionsAddr;
if (type == 1)
{
result = GetJmpType(result,1);
}
}
else if(substr(instructions,0,19) == "B sub")
{
//Message("%X: %s\n",instructionsAddr,instructions);
instructionsAddr = xtol(substr(instructions,strstr(instructions,"sub_")+4,-1));
result = instructionsAddr;
if (type == 1)
{
result = GetJmpType(result,1);
}
}
else if(instructions == "ADD.W R1, R1, #1")
{
if (GetDisasm(instructionsAddr+4) == "SUB.W R1, R1, #1")
{
if (g_patch==1)PatchWord(instructionsAddr,g_nop);
MakeCode((instructionsAddr & 0xFFFFFFFE));
//Message("%X: %s\n",instructionsAddr,GetDisasm(instructionsAddr));
if (g_patch==1)PatchWord(instructionsAddr+2,g_nop);
MakeCode(((instructionsAddr+2) & 0xFFFFFFFE));
//Message("%X: %s\n",instructionsAddr+2,GetDisasm(instructionsAddr+2));
if (g_patch==1)PatchWord(instructionsAddr+4,g_nop);
MakeCode(((instructionsAddr+4) & 0xFFFFFFFE));
//Message("%X: %s\n",instructionsAddr+4,GetDisasm(instructionsAddr+4));
if (g_patch==1)PatchWord(instructionsAddr+6,g_nop);
MakeCode(((instructionsAddr+6) & 0xFFFFFFFE));
//Message("%X: %s\n",instructionsAddr+6,GetDisasm(instructionsAddr+6));
result = instructionsAddr + 8;
}
}
else
{
if (type == 1)
{
if (ItemSize(instructionsAddr)==2)
{
if (g_patch==1)PatchWord(instructionsAddr,g_nop);
MakeCode((instructionsAddr & 0xFFFFFFFE));
//Message("%X: %s\n",instructionsAddr,GetDisasm(instructionsAddr));
result = instructionsAddr + 2;
}
else if (ItemSize(addr)==4)
{
if (g_patch==1)PatchWord(instructionsAddr,g_nop);
MakeCode((instructionsAddr & 0xFFFFFFFE));
//Message("%X: %s\n",instructionsAddr,GetDisasm(instructionsAddr));
if (g_patch==1)PatchWord(instructionsAddr+2,g_nop);
MakeCode(((instructionsAddr+2) & 0xFFFFFFFE));
//Message("%X: %s\n",instructionsAddr+2,GetDisasm(instructionsAddr+2));
result = instructionsAddr + 4;
}
result = GetJmpType(result,1);
}
else
{
Message("%X: %s\n",instructionsAddr,instructions);
result = addr + ItemSize(instructionsAddr);
if (instructions == "POPEQ.W {R4-R10,PC}")result = 0;
if (instructions == "POPEQ.W {R4-R9,PC}")result = 0;
if (instructions == "POP.W {R4-R9,PC}")result = 0;
if (instructions == "POP.W {R4-R11,PC}")result = 0;
if (instructions == "POPEQ.W {R4-R8,PC}")result = 0;
}
}
}
else
{
//pc = GetRegValue("PC");
Message("finish\n");
}
return result;
}
static main(void)
{
auto i;
auto pc;
auto addr = 0;
auto count = 10000;
g_startAddr = 0;
g_endAddr = 0;
g_nop = 0xBF00;
//pc = GetRegValue("PC");
g_baseAddr = 0x1980;//SegStart( pc );
g_startAddr = g_baseAddr;
g_endAddr = g_baseAddr + 0x1D1E4;
g_patch = 0;
Message("g_baseAddr: %X \n",g_baseAddr);
addr = 0x2874;
for (i = 0; i < count; i++)
{
addr = GetJmpType(addr,0);
if (addr == 0)break;
}
}
2、算法如下:
unsigned char g_table[1024] = {
0xB7, 0x00, 0x00, 0x00, 0x6B, 0x00, 0x00, 0x00, 0xA6, 0x00, 0x00, 0x00, 0xDC, 0x00, 0x00, 0x00,
0x11, 0x00, 0x00, 0x00, 0x5B, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x5A, 0x00, 0x00, 0x00,
0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x74, 0x00, 0x00, 0x00, 0xB2, 0x00, 0x00, 0x00,
0x43, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0xBE, 0x00, 0x00, 0x00,
0xED, 0x00, 0x00, 0x00, 0x26, 0x00, 0x00, 0x00, 0x09, 0x00, 0x00, 0x00, 0xC7, 0x00, 0x00, 0x00,
0x31, 0x00, 0x00, 0x00, 0x45, 0x00, 0x00, 0x00, 0xCE, 0x00, 0x00, 0x00, 0xCF, 0x00, 0x00, 0x00,
0x91, 0x00, 0x00, 0x00, 0x70, 0x00, 0x00, 0x00, 0xC6, 0x00, 0x00, 0x00, 0xB1, 0x00, 0x00, 0x00,
0x5E, 0x00, 0x00, 0x00, 0x61, 0x00, 0x00, 0x00, 0x55, 0x00, 0x00, 0x00, 0x15, 0x00, 0x00, 0x00,
0xBD, 0x00, 0x00, 0x00, 0x1A, 0x00, 0x00, 0x00, 0x4B, 0x00, 0x00, 0x00, 0xC5, 0x00, 0x00, 0x00,
0xF6, 0x00, 0x00, 0x00, 0x22, 0x00, 0x00, 0x00, 0xA2, 0x00, 0x00, 0x00, 0x72, 0x00, 0x00, 0x00,
0xFF, 0x00, 0x00, 0x00, 0x42, 0x00, 0x00, 0x00, 0xF3, 0x00, 0x00, 0x00, 0x6A, 0x00, 0x00, 0x00,
0x8F, 0x00, 0x00, 0x00, 0x87, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0xDF, 0x00, 0x00, 0x00,
0x6F, 0x00, 0x00, 0x00, 0xB0, 0x00, 0x00, 0x00, 0xBA, 0x00, 0x00, 0x00, 0xA4, 0x00, 0x00, 0x00,
0x85, 0x00, 0x00, 0x00, 0xEA, 0x00, 0x00, 0x00, 0x8E, 0x00, 0x00, 0x00, 0x32, 0x00, 0x00, 0x00,
0xA1, 0x00, 0x00, 0x00, 0x2D, 0x00, 0x00, 0x00, 0xEF, 0x00, 0x00, 0x00, 0xAA, 0x00, 0x00, 0x00,
0xE3, 0x00, 0x00, 0x00, 0xA3, 0x00, 0x00, 0x00, 0xBF, 0x00, 0x00, 0x00, 0x2C, 0x00, 0x00, 0x00,
0xE0, 0x00, 0x00, 0x00, 0x47, 0x00, 0x00, 0x00, 0x3D, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00,
0xB9, 0x00, 0x00, 0x00, 0xCC, 0x00, 0x00, 0x00, 0x7D, 0x00, 0x00, 0x00, 0x7F, 0x00, 0x00, 0x00,
0x6D, 0x00, 0x00, 0x00, 0x7A, 0x00, 0x00, 0x00, 0x12, 0x00, 0x00, 0x00, 0x1C, 0x00, 0x00, 0x00,
0xDB, 0x00, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00, 0xFC, 0x00, 0x00, 0x00, 0xC0, 0x00, 0x00, 0x00,
0xAF, 0x00, 0x00, 0x00, 0x0C, 0x00, 0x00, 0x00, 0x62, 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00,
0x59, 0x00, 0x00, 0x00, 0x24, 0x00, 0x00, 0x00, 0xE8, 0x00, 0x00, 0x00, 0x4C, 0x00, 0x00, 0x00,
0xCB, 0x00, 0x00, 0x00, 0xCD, 0x00, 0x00, 0x00, 0x60, 0x00, 0x00, 0x00, 0x39, 0x00, 0x00, 0x00,
0xC9, 0x00, 0x00, 0x00, 0x3A, 0x00, 0x00, 0x00, 0x98, 0x00, 0x00, 0x00, 0x77, 0x00, 0x00, 0x00,
0xE2, 0x00, 0x00, 0x00, 0xAB, 0x00, 0x00, 0x00, 0xB8, 0x00, 0x00, 0x00, 0xD7, 0x00, 0x00, 0x00,
0x3C, 0x00, 0x00, 0x00, 0x69, 0x00, 0x00, 0x00, 0x53, 0x00, 0x00, 0x00, 0x1F, 0x00, 0x00, 0x00,
0xCA, 0x00, 0x00, 0x00, 0x88, 0x00, 0x00, 0x00, 0x51, 0x00, 0x00, 0x00, 0x4D, 0x00, 0x00, 0x00,
0x8A, 0x00, 0x00, 0x00, 0x36, 0x00, 0x00, 0x00, 0xE7, 0x00, 0x00, 0x00, 0xAE, 0x00, 0x00, 0x00,
0xD2, 0x00, 0x00, 0x00, 0xD1, 0x00, 0x00, 0x00, 0xFB, 0x00, 0x00, 0x00, 0x8B, 0x00, 0x00, 0x00,
0x5D, 0x00, 0x00, 0x00, 0x0D, 0x00, 0x00, 0x00, 0xA8, 0x00, 0x00, 0x00, 0x8D, 0x00, 0x00, 0x00,
0x0A, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x82, 0x00, 0x00, 0x00, 0xD4, 0x00, 0x00, 0x00,
0x0E, 0x00, 0x00, 0x00, 0x2F, 0x00, 0x00, 0x00, 0x57, 0x00, 0x00, 0x00, 0x5C, 0x00, 0x00, 0x00,
0x20, 0x00, 0x00, 0x00, 0x3E, 0x00, 0x00, 0x00, 0xD0, 0x00, 0x00, 0x00, 0xB6, 0x00, 0x00, 0x00,
0xBC, 0x00, 0x00, 0x00, 0x33, 0x00, 0x00, 0x00, 0x4E, 0x00, 0x00, 0x00, 0x90, 0x00, 0x00, 0x00,
0x17, 0x00, 0x00, 0x00, 0xF2, 0x00, 0x00, 0x00, 0xB5, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00,
0x79, 0x00, 0x00, 0x00, 0x99, 0x00, 0x00, 0x00, 0x2B, 0x00, 0x00, 0x00, 0xFD, 0x00, 0x00, 0x00,
0xAD, 0x00, 0x00, 0x00, 0xA5, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x16, 0x00, 0x00, 0x00,
0x40, 0x00, 0x00, 0x00, 0x3B, 0x00, 0x00, 0x00, 0x07, 0x00, 0x00, 0x00, 0x9E, 0x00, 0x00, 0x00,
0xDD, 0x00, 0x00, 0x00, 0x48, 0x00, 0x00, 0x00, 0x2E, 0x00, 0x00, 0x00, 0x25, 0x00, 0x00, 0x00,
0x27, 0x00, 0x00, 0x00, 0xA7, 0x00, 0x00, 0x00, 0x89, 0x00, 0x00, 0x00, 0xF9, 0x00, 0x00, 0x00,
0x95, 0x00, 0x00, 0x00, 0x68, 0x00, 0x00, 0x00, 0x1B, 0x00, 0x00, 0x00, 0x6E, 0x00, 0x00, 0x00,
0x84, 0x00, 0x00, 0x00, 0xF7, 0x00, 0x00, 0x00, 0xC4, 0x00, 0x00, 0x00, 0xC8, 0x00, 0x00, 0x00,
0x71, 0x00, 0x00, 0x00, 0x6C, 0x00, 0x00, 0x00, 0x86, 0x00, 0x00, 0x00, 0x29, 0x00, 0x00, 0x00,
0xB3, 0x00, 0x00, 0x00, 0xEC, 0x00, 0x00, 0x00, 0x92, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00,
0x4F, 0x00, 0x00, 0x00, 0x41, 0x00, 0x00, 0x00, 0xB4, 0x00, 0x00, 0x00, 0xD8, 0x00, 0x00, 0x00,
0x58, 0x00, 0x00, 0x00, 0x1D, 0x00, 0x00, 0x00, 0xD6, 0x00, 0x00, 0x00, 0x44, 0x00, 0x00, 0x00,
0x49, 0x00, 0x00, 0x00, 0x81, 0x00, 0x00, 0x00, 0x3F, 0x00, 0x00, 0x00, 0x67, 0x00, 0x00, 0x00,
0x96, 0x00, 0x00, 0x00, 0x35, 0x00, 0x00, 0x00, 0xAC, 0x00, 0x00, 0x00, 0x21, 0x00, 0x00, 0x00,
0xE9, 0x00, 0x00, 0x00, 0x64, 0x00, 0x00, 0x00, 0x56, 0x00, 0x00, 0x00, 0x19, 0x00, 0x00, 0x00,
0x9B, 0x00, 0x00, 0x00, 0xD9, 0x00, 0x00, 0x00, 0xC3, 0x00, 0x00, 0x00, 0xBB, 0x00, 0x00, 0x00,
0x4A, 0x00, 0x00, 0x00, 0xD3, 0x00, 0x00, 0x00, 0xE6, 0x00, 0x00, 0x00, 0xE4, 0x00, 0x00, 0x00,
0x9D, 0x00, 0x00, 0x00, 0xD5, 0x00, 0x00, 0x00, 0x8C, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00,
0x83, 0x00, 0x00, 0x00, 0x7C, 0x00, 0x00, 0x00, 0x9C, 0x00, 0x00, 0x00, 0xC1, 0x00, 0x00, 0x00,
0xFA, 0x00, 0x00, 0x00, 0x93, 0x00, 0x00, 0x00, 0x97, 0x00, 0x00, 0x00, 0x76, 0x00, 0x00, 0x00,
0xDA, 0x00, 0x00, 0x00, 0x38, 0x00, 0x00, 0x00, 0x73, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00,
0x28, 0x00, 0x00, 0x00, 0x13, 0x00, 0x00, 0x00, 0xF4, 0x00, 0x00, 0x00, 0x0F, 0x00, 0x00, 0x00,
0x23, 0x00, 0x00, 0x00, 0x52, 0x00, 0x00, 0x00, 0x9A, 0x00, 0x00, 0x00, 0x7B, 0x00, 0x00, 0x00,
0xA9, 0x00, 0x00, 0x00, 0xF8, 0x00, 0x00, 0x00, 0x9F, 0x00, 0x00, 0x00, 0x50, 0x00, 0x00, 0x00,
0x65, 0x00, 0x00, 0x00, 0xF1, 0x00, 0x00, 0x00, 0x34, 0x00, 0x00, 0x00, 0xEE, 0x00, 0x00, 0x00,
0xA0, 0x00, 0x00, 0x00, 0x37, 0x00, 0x00, 0x00, 0x46, 0x00, 0x00, 0x00, 0xE5, 0x00, 0x00, 0x00,
0x5F, 0x00, 0x00, 0x00, 0x75, 0x00, 0x00, 0x00, 0x7E, 0x00, 0x00, 0x00, 0xC2, 0x00, 0x00, 0x00,
0xEB, 0x00, 0x00, 0x00, 0x66, 0x00, 0x00, 0x00, 0xDE, 0x00, 0x00, 0x00, 0xFE, 0x00, 0x00, 0x00,
0xF5, 0x00, 0x00, 0x00, 0x0B, 0x00, 0x00, 0x00, 0x2A, 0x00, 0x00, 0x00, 0xF0, 0x00, 0x00, 0x00,
0x63, 0x00, 0x00, 0x00, 0xE1, 0x00, 0x00, 0x00, 0x1E, 0x00, 0x00, 0x00, 0x54, 0x00, 0x00, 0x00
}; //通过19931012算出来的,具体算法没仔细看,直接扣内存
int _tmain(int argc, _TCHAR* argv[])
{
char szDes[260]={0};
int len = Base64_Decode(szDes,(char*)"JPyjup3eCyJjlkV6DmSmGHQ",sizeof("JPyjup3eCyJjlkV6DmSmGHQ"));
unsigned char t = 0;
unsigned char s = 0;
unsigned int sum = 0;
unsigned char szkey[0x20] = "";
printf("key:");
for (i=1;i<len;i++)
{
t = lpTable[i];
sum = sum + t;
s = sum;
lpTable[i] = lpTable[s];
lpTable[s] = t;
s = lpTable[s] + lpTable[i];
szkey[i-1] = lpTable[s]^szDes[i-1];
printf("%c",szkey[i-1]);
}
return 0;
}
key:madebyericky94528
[培训]《安卓高级研修班(网课)》月薪三万计划,掌握调试、分析还原ollvm、vmp的方法,定制art虚拟机自动化脱壳的方法