内存Fuzz与WINAFL实战
概述
FoxitReader
sxe ld:ConvertToPDF_x86
bm /a ConvertToPDF_x86!*
0:000> bm /a ConvertToPDF_x86!*
1: 00000000`6d798e30 @!"ConvertToPDF_x86!DestorFXPDFConvertor"
2: 00000000`6d79aaf0 @!"ConvertToPDF_x86!CreateFXPDFConvertor"
0:000> g
Breakpoint 2 hit
ConvertToPDF_x86!CreateFXPDFConvertor:
6d79aaf0 a10cd1c36d mov eax,dword ptr [ConvertToPDF_x86!CreateFXPDFConvertor+0x4a261c (6dc3d10c)] ds:002b:6dc3d10c=00000000
_DWORD *CreateFXPDFConvertor()
{
_DWORD *result; // eax
void *obj; // eax
result = dword_104AD10C;
if ( dword_104AD10C )
return result; // 调用malloc分配内存
obj = alloc(0x1BDCu);
if ( obj )
{
result = init_obj(obj); // 初始化对象
dword_104AD10C = result;
}
else
{
result = 0;
dword_104AD10C = 0;
}
return result;
}
_DWORD *__thiscall init_obj(int this)
{
int v1; // esi
v1 = this;
*this = &CFX_PDFConvertor::`vftable'; // 给对象设置虚表
sub_1000A720((this + 4));
*(v1 + 7104) = 0;
*(v1 + 7108) = 0;
*(v1 + 7112) = 0;
*(v1 + 7120) = 0;
*(v1 + 7116) = 1;
dword_104AD104 = 0;
*(v1 + 7124) = 0;
*(v1 + 7128) = 0;
return v1;
}
.rdata:10336F1C ; const CFX_PDFConvertor::`vftable'
.rdata:10336F1C ??_7CFX_PDFConvertor@@6B@ dd offset sub_1000B060
.rdata:10336F1C ; DATA XREF: init_obj+6↑o
.rdata:10336F1C ; sub_1000A8F0+BA↑o
.rdata:10336F20 dd offset sub_10009B40
.rdata:10336F24 dd offset sub_1000A2D0
.rdata:10336F28 dd offset sub_1000A8F0
0:000:x86> lm m Conver*start end module name6d790000 6dcb5000 ConvertToPDF_x86 (export symbols) C:\Program Files (x86)\Foxit Software\Foxit Reader\Plugins\Creator\x86\ConvertToPDF_x86.dll0:000:x86> dd 0x6dac6f1c l4 // 查看虚表的函数的实际地址6dac6f1c 6d79b060 6d799b40 6d79a2d0 6d79a8f00:000:x86> bp 6d79b060 0:000:x86> bp 6d799b40 0:000:x86> bp 6d79a2d0 0:000:x86> bp 6d79a8f00:000:x86> bl0 e x86 6d79b060 0001 (0001) 0:**** ConvertToPDF_x86!CreateFXPDFConvertor+0x5701 e x86 6d798e30 0001 (0001) 0:**** ConvertToPDF_x86!DestorFXPDFConvertor2 e x86 6d79aaf0 0001 (0001) 0:**** ConvertToPDF_x86!CreateFXPDFConvertor3 e x86 6d799b40 0001 (0001) 0:**** ConvertToPDF_x86!DestorFXPDFConvertor+0xd104 e x86 6d79a2d0 0001 (0001) 0:**** ConvertToPDF_x86!DestorFXPDFConvertor+0x14a05 e x86 6d79a8f0 0001 (0001) 0:**** ConvertToPDF_x86!DestorFXPDFConvertor+0x1ac00:000:x86> gBreakpoint 3 hitConvertToPDF_x86!DestorFXPDFConvertor+0xd10:6d799b40 55 push ebp 0:000:x86> r // 首先调用6d799b40函数eax=6d799b40 ebx=0ad6a1a8 ecx=0ad6a1a8 edx=6dac6f1c esi=0088fb68 edi=00000002eip=6d799b40 esp=002cce0c ebp=002cece8 iopl=0 nv up ei pl zr na pe nccs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000246ConvertToPDF_x86!DestorFXPDFConvertor+0xd10:6d799b40 55 push ebp0:000:x86> dps esp l4 # 参数为 2002cce0c 02398a54 FoxitReader!CryptUIWizExport+0x885514002cce10 00000002002cce14 711d4f33002cce18 02c2f814 FoxitReader!CryptUIWizExport+0x111c2d40:000:x86> gBreakpoint 4 hitConvertToPDF_x86!DestorFXPDFConvertor+0x14a0:6d79a2d0 55 push ebp0:000:x86> r // 然后调用6d79a2d0eax=002cec10 ebx=0ad6a10b ecx=0ad6a1a8 edx=6d79a2d0 esi=0ad6a1a8 edi=00000000eip=6d79a2d0 esp=002cce0c ebp=002cece8 iopl=0 nv up ei pl zr na pe nccs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000246ConvertToPDF_x86!DestorFXPDFConvertor+0x14a0:6d79a2d0 55 push ebp0:000:x86> dps esp l6002cce0c 02398c22 FoxitReader!CryptUIWizExport+0x8856e2002cce10 002cec10002cce14 711d4f33002cce18 02c2f814 FoxitReader!CryptUIWizExport+0x111c2d4002cce1c 05d8149c002cce20 0088f9c00:000:x86> du 002cec10 # 参数是一个unicode字符串002cec10 "Foxit Reader PDF Printer"0:000:x86> gBreakpoint 0 hitConvertToPDF_x86!CreateFXPDFConvertor+0x570:6d79b060 55 push ebp0:000:x86> r # 调用 6d79b060eax=6dac6f1c ebx=0ad6a10b ecx=0ad6a1a8 edx=6d79b060 esi=0ad6a1a8 edi=00000000eip=6d79b060 esp=002cce04 ebp=002cece8 iopl=0 nv up ei pl zr na pe nccs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000246ConvertToPDF_x86!CreateFXPDFConvertor+0x570:6d79b060 55 push ebp0:000:x86> dps esp l6002cce04 02398c3f FoxitReader!CryptUIWizExport+0x8856ff002cce08 002cce50002cce0c 00000000002cce10 00000000002cce14 711d4f33002cce18 02c2f814 FoxitReader!CryptUIWizExport+0x111c2d40:000:x86> du 002cce50 # 参数开头是被处理图片的地址002cce50 "C:\Users\XinSai\Desktop\honeyvie"002cce90 "w\5mb.jpg"0:000:x86> gBreakpoint 1 hitConvertToPDF_x86!DestorFXPDFConvertor:6d798e30 55 push ebp0:000:x86> r # 调用DestorFXPDFConvertor销毁创建的对象eax=00000000 ebx=0ad6a10b ecx=2156cf22 edx=0ad65078 esi=0ad6a1a8 edi=00000000eip=6d798e30 esp=002cce0c ebp=002cece8 iopl=0 nv up ei pl zr na pe nccs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000246ConvertToPDF_x86!DestorFXPDFConvertor:6d798e30 55 push ebp0:000:x86> gBreakpoint 5 hitConvertToPDF_x86!DestorFXPDFConvertor+0x1ac0:6d79a8f0 a110d1c36d mov eax,dword ptr [ConvertToPDF_x86!CreateFXPDFConvertor+0x4a2620 (6dc3d110)] ds:002b:6dc3d110=0ad68e70
sub_10009B4 参数为 this , 2
sub_1000A2D0 参数为 "Foxit Reader PDF Printer" , unicode字符串
sub_1000B060 参数为 this, 输入文件的全路径, 0, 0
DestorFXPDFConvertor 函数会调用sub_1000A8F0去销毁对象
int main()
{
HMODULE hMod = LoadLibrary(_T("C:\\Program Files (x86)\\Foxit Software\\Foxit Reader\\plugins\\Creator\\x86\\ConvertToPDF_x86.dll"));
if (hMod) {
pCreateFXPDFConvertor = (CreateFXPDFConvertor)GetProcAddress(hMod, "CreateFXPDFConvertor");
pDestorFXPDFConvertor = (DestorFXPDFConvertor)GetProcAddress(hMod, "DestorFXPDFConvertor");
printf("CreateFXPDFConvertor:%p\n", pCreateFXPDFConvertor);
char* obj = pCreateFXPDFConvertor();
printf("create convertor:%p\n", obj);
char* mod_base = (char*)hMod;
vtable* vtb = (vtable*)(mod_base + 0x336f1c); // get vtable offset
printf("module base:%p\n", mod_base);
printf("vtb:%p\n", vtb);
vtb->p_sub_10009B40(obj, 2);
vtb->p_sub_1000A2D0(_T("Foxit Reader PDF Printer"));
vtb->p_sub_1000B060(obj, (char*)_T("C:\\Users\\XinSai\\Desktop\\honeyview\\5mb.jpg"),0,0);
pDestorFXPDFConvertor(obj);
}
return 0;
}
0:000:x86> lm m Conver*
start end module name
6d790000 6dcb5000 ConvertToPDF_x86 (export symbols) C:\Program Files (x86)\Foxit Software\Foxit Reader\plugins\Creator\x86\ConvertToPDF_x86.dll
0:000:x86> r
eax=00000000 ebx=00000000 ecx=00750070 edx=00000000 esi=0027ec60 edi=00278360
eip=6d79995e esp=0022fa10 ebp=0022fa1c iopl=0 nv up ei pl zr na pe nc
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010246
ConvertToPDF_x86!DestorFXPDFConvertor+0xb2e:
6d79995e 8b7910 mov edi,dword ptr [ecx+10h] ds:002b:00750080=????????
0:000:x86> kb 4
ChildEBP RetAddr Args to Child
WARNING: Stack unwind information not available. Following frames may be wrong.
0022fa1c 6d79ac6b 00750070 00000000 ffffffff ConvertToPDF_x86!DestorFXPDFConvertor+0xb2e
0022fa4c 6d79aed5 0027ec60 002776ec 002776e8 ConvertToPDF_x86!CreateFXPDFConvertor+0x17b
0022fa68 6d79b0e6 00000000 a9d0a4e7 0022fbb4 # 在sub_1000B060里面
0022faa4 013b67b6 00000000 00000000 00000000 ConvertToPDF_x86!CreateFXPDFConvertor+0x5f6
char *__thiscall crash_func(_DWORD *this, int invaild_address, unsigned int a3, unsigned int a4)
{
obj = this;
path_ = invaild_address;
v6 = *(invaild_address + 16);// 解引 invaild_address+16 时异常
void __thiscall sub_1000ABA0(unsigned int *this, unsigned int a2)
{
.....................
.....................
.....................
if ( v8 )
{
v8[5] = 7;
v8[4] = 0;
*v8 = 0;
crash_func(v8, a2, 0, 0xFFFFFFFF); // 调用发送crash的函数
char *__thiscall sub_1000AC90(char *this, int path_info)
{
.....................
.....................
.....................
p = *(path_info + 3188);
if ( (*(path_info + 3192) - p) / 28 )
{
idx = 0;
do
{
sub_1000ABA0(v3 + 797, p + idx); // 第二个参数为一个非法指针
p = v2[797];
++v29;
idx += 28;
}
while ( v29 < (v2[798] - p) / 28 );
}
signed int __thiscall sub_1000B060(const WCHAR *this, int path_info, int a3, char *a4)
{
path_info_ = path_info;
...........
...........
sub_1000AC90(this + 4, path_info_);
vtb->p_sub_1000B060(obj, (char*)_T("C:\\Users\\XinSai\\Desktop\\honeyview\\5mb.jpg"),0,0);
*(v3 + 936) = *(path_info + 3744); // 取结构体的字段
*(v3 + 937) = *(path_info + 3748);
*(v3 + 938) = *(path_info + 3752);
*(v3 + 939) = *(path_info + 3756);
*(v3 + 940) = *(path_info + 3760);
*(v3 + 934) = *(path_info + 3736);
p = *(path_info + 3188);
if ( (*(path_info + 3192) - p) / 28 )
{
idx = 0;
do
{
sub_1000ABA0(v3 + 797, p + idx); // 第二个参数为一个非法指针
p = v2[797];
++v29;
idx += 28;
}
while ( v29 < (v2[798] - p) / 28 );
}
0:000:x86> r
eax=003ece88 ebx=00000000 ecx=0a55a1ac edx=6d79b060 esi=0a55a1a8 edi=0a55a1ac
eip=6d79ac90 esp=003ece00 ebp=003ece38 iopl=0 nv up ei pl zr na pe nc
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000246
ConvertToPDF_x86!CreateFXPDFConvertor+0x1a0:
6d79ac90 55 push ebp
0:000:x86> dd esp l2
003ece00 6d79b0e6 003ece88
0:000:x86> db 003ece88
003ece88 43 00 3a 00 5c 00 55 00-73 00 65 00 72 00 73 00 C.:.\.U.s.e.r.s.
003ece98 5c 00 58 00 69 00 6e 00-53 00 61 00 69 00 5c 00 \.X.i.n.S.a.i.\.
003ecea8 44 00 65 00 73 00 6b 00-74 00 6f 00 70 00 5c 00 D.e.s.k.t.o.p.\.
003eceb8 68 00 6f 00 6e 00 65 00-79 00 76 00 69 00 65 00 h.o.n.e.y.v.i.e.
003ecec8 77 00 5c 00 35 00 6d 00-62 00 2e 00 6a 00 70 00 w.\.5.m.b...j.p.
003eced8 67 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 g...............
003ecee8 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
003ecef8 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
0:000:x86> db 003ece88+0x208
003ed090 43 00 3a 00 5c 00 55 00-73 00 65 00 72 00 73 00 C.:.\.U.s.e.r.s.
003ed0a0 5c 00 58 00 69 00 6e 00-53 00 61 00 69 00 5c 00 \.X.i.n.S.a.i.\.
003ed0b0 41 00 70 00 70 00 44 00-61 00 74 00 61 00 5c 00 A.p.p.D.a.t.a.\.
003ed0c0 4c 00 6f 00 63 00 61 00-6c 00 5c 00 54 00 65 00 L.o.c.a.l.\.T.e.
003ed0d0 6d 00 70 00 5c 00 31 00-35 00 37 00 33 00 30 00 m.p.\.1.5.7.3.0.
003ed0e0 33 00 37 00 34 00 38 00-32 00 2e 00 70 00 64 00 3.7.4.8.2...p.d.
003ed0f0 66 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 f...............
003ed100 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
0:000:x86> db 003ece88+0x410
003ed298 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
003ed2a8 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
0:000:x86> db 003ece88+0x618
003ed4a0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
003ed4b0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
0:000:x86> db 003ece88+0x820
0:000:x86> lm m Convert*
start end module name
6d790000 6dcb5000 ConvertToPDF_x86 (export symbols) C:\Program Files (x86)\Foxit Software\Foxit Reader\Plugins\Creator\x86\ConvertToPDF_x86.dll
0:000:x86> kb 4
ChildEBP RetAddr Args to Child
WARNING: Stack unwind information not available. Following frames may be wrong.
003ecdfc 6d79b0e6 003ece88 c6266dd3 00000000 ConvertToPDF_x86!CreateFXPDFConvertor+0x1a0
003ece38 02398c3f 00000000 00000000 00000000 ConvertToPDF_x86!CreateFXPDFConvertor+0x5f6
003eed20 02396b76 082cad3c 08351664 00000000 FoxitReader!CryptUIWizExport+0x8856ff
003eef74 023997e0 00adf9c0 082cad30 083087c0 FoxitReader!CryptUIWizExport+0x883636
0:000:x86> lm m FoxitReader
start end module name
00f00000 03cd3000 FoxitReader (export symbols) C:\Program Files (x86)\Foxit Software\Foxit Reader\FoxitReader.exe
int __thiscall sub_1898690(_DWORD *this, int a2, int a3, int a4, int a5)
{
char path_info[520]; // [esp+3Ch] [ebp-1E98h]
char v83[2608]; // [esp+244h] [ebp-1C90h]
int v84; // [esp+C74h] [ebp-1260h]
int v85; // [esp+F00h] [ebp-FD4h]
char v86[404]; // [esp+1A64h] [ebp-470h]
char v87; // [esp+1BF8h] [ebp-2DCh]
void *v88; // [esp+1DE0h] [ebp-F4h]
int v89; // [esp+1DF0h] [ebp-E4h]
unsigned int v90; // [esp+1DF4h] [ebp-E0h]
__int16 v91[100]; // [esp+1DFCh] [ebp-D8h]
int v92; // [esp+1ED0h] [ebp-4h]
v81 = ((*v81)[2])(v81, v91);
if ( !v81 )
v81 = (**v65)(v65, path_info, 0, 0); // 调用sub_1000B060
00001E98 path_info db 520 dup(?)
-00001C90 var_1C90 db 2608 dup(?)
-00001260 var_1260 dd ?
-0000125C db ? ; undefined
-0000125B db ? ; undefined
int main()
{
HMODULE hMod = LoadLibrary(_T("C:\\Program Files (x86)\\Foxit Software\\Foxit Reader\\plugins\\Creator\\x86\\ConvertToPDF_x86.dll"));
if (hMod) {
pCreateFXPDFConvertor = (CreateFXPDFConvertor)GetProcAddress(hMod, "CreateFXPDFConvertor");
pDestorFXPDFConvertor = (DestorFXPDFConvertor)GetProcAddress(hMod, "DestorFXPDFConvertor");
printf("CreateFXPDFConvertor:%p\n", pCreateFXPDFConvertor);
char* obj = pCreateFXPDFConvertor();
printf("create convertor:%p\n", obj);
char* mod_base = (char*)hMod;
vtable* vtb = (vtable*)(mod_base + 0x336f1c); // get vtable offset
printf("module base:%p\n", mod_base);
printf("vtb:%p\n", vtb);
vtb->p_sub_10009B40(obj, 2);
vtb->p_sub_1000A2D0(_T("Foxit Reader PDF Printer"));
unsigned int info_size = 0x2000;
char* path_info = (char*)malloc(info_size);
memset(path_info, 0, info_size);
wchar_t* input_image = _T("C:\\Users\\XinSai\\Desktop\\honeyview\\5mb.jpg");
wchar_t* output_pdf = _T("C:\\tmp.pdf");
// 设置输入图片的路径
wcscpy((wchar_t*)path_info, input_image);
//设置输出图片的路径
wcscpy((wchar_t*)(path_info + 0x208), output_pdf);
printf("path info:%p\n", path_info);
int ret = vtb->p_sub_1000B060(obj, path_info,0,0);
printf("sub_1000B060 return: %d\n", ret);
pDestorFXPDFConvertor(obj);
free(path_info);
}
return 0;
}
内存Fuzz
class MyClass
{
public:
int __thiscall my_sub_1000B060(char* path_info, int a, int b) {
char* input_image = "c:\\fuzz.jpg";
wcscpy((wchar_t*)path_info, char_to_wchar(input_image));
char* init_file = "c:\\init.jpg";
INIT_SEED.buffer = read_file(init_file, &INIT_SEED.length);
int ret = 0;
while (true)
{
fuzz(input_image); // 变异初始用例,并写入input_image
ret = raw_sub_1000B060((char*)this, path_info, a, b); // 调用原始的目标函数
debugger_printf("fuzzed function return:%d\n", ret);
}
}
private:
};
int __stdcall DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpReserved)
{
char* base = NULL;
unsigned long hook_func_addr = NULL;
switch (fdwReason)
{
case DLL_PROCESS_ATTACH://加载时候
base = (char*)GetModuleHandle(_T("ConvertToPDF_x86.dll"));
debugger_printf("base:%p\n", base);
raw_sub_1000B060 = (sub_1000B060)(base + 0xB060);
char buf[0x20];
sprintf(buf, "%u", &MyClass::my_sub_1000B060);
hook_func_addr = atoll(buf);
if (Mhook_SetHook((PVOID*)&raw_sub_1000B060, (void *)hook_func_addr)) {
debugger_printf("base: %p, func:%p", base, hook_func_addr);
}
break;
default:
break;
}
return TRUE;
}
char buf[0x20];
sprintf(buf, "%u", &MyClass::my_sub_1000B060);
hook_func_addr = atoll(buf);
WinAFL
首先目标函数会打开一个文件读取数据,处理数据,最后会把文件关闭。
目标函数不会调用exit之类会结束进程的函数。
void fuzz_func(char* path) {
vtb->p_sub_10009B40(obj, 2);
vtb->p_sub_1000A2D0(_T("Foxit Reader PDF Printer"));
memset(path_info, 0, 0x2000);
wchar_t* input_image = _T("C:\\Users\\XinSai\\Desktop\\honeyview\\5mb.jpg");
wchar_t* output_pdf = _T("C:\\tmp.pdf");
wcscpy((wchar_t*)path_info, char_to_wchar(path));
wcscpy((wchar_t*)(path_info + 0x208), output_pdf);
int ret = vtb->p_sub_1000B060(obj, path_info, 0, 0);
printf("sub_1000B060 return: %d\n", ret);
}
int main(int argc, char** argv)
{
if (argc < 2) {
printf("fuzz.exe path\n");
return 1;
}
//加载dll到内存
HMODULE hMod = LoadLibrary(_T("C:\\Program Files (x86)\\Foxit Software\\Foxit Reader\\plugins\\Creator\\x86\\ConvertToPDF_x86.dll"));
if (hMod) {
pCreateFXPDFConvertor = (CreateFXPDFConvertor)GetProcAddress(hMod, "CreateFXPDFConvertor");
pDestorFXPDFConvertor = (DestorFXPDFConvertor)GetProcAddress(hMod, "DestorFXPDFConvertor");
printf("CreateFXPDFConvertor:%p\n", pCreateFXPDFConvertor);
// 创建好对象
obj = pCreateFXPDFConvertor();
printf("create convertor:%p\n", obj);
//初始化全局虚表指针到DLL的虚表
char* mod_base = (char*)hMod;
vtb = (vtable*)(mod_base + 0x336f1c); // get vtable offset
printf("module base:%p\n", mod_base);
printf("vtb:%p\n", vtb);
//调用函数处理数据
fuzz_func(argv[1]);
//释放分配的对象
pDestorFXPDFConvertor(obj);
}
return 0;
}
afl-fuzz.exe -i in -o out -D C:\Users\XinSai\Desktop\winafl-master\DynamoRIO-Windows-7.91.18187-0\bin32 -t 20000 -- -coverage_module ConvertToPDF.dll -fuzz_iterations 50000 -target_module dllloader.exe -target_method fuzz_func -nargs 1 -- C:\Users\XinSai\Desktop\foxitfuzz\dllloader\Debug\dllloader.exe @@
-D:指定dynamorio 的drrun.exe所在的路径
-coverage_module:指定需要获取覆盖率的模块
-target_method:目标函数的函数名,winafl会不断的执行该函数
-nargs:target_method函数的参数个数
-target_module:target_method所在的模块名
-fuzz_iterations:指定target_method最多执行次数,达到次数后会重启程序
path\of\dynamorio\bin32\drrun.exe -c winafl.dll -debug -- C:\Users\XinSai\Desktop\foxitfuzz\dllloader\Debug\dllloader.exe c:\init.jpg
Module loaded, dllloader.exe
............................
............................
Module loaded, ConvertToPDF.dll
IrfanView
"C:\Program Files (x86)\IrfanView\i_view32.exe" C:\example_2000.dwg
afl-fuzz.exe -i dwg -o dwgoutput -D C:\Users\XinSai\Desktop\winafl-master\DynamoRIO-Windows-7.91.18187-0\bin32 -t 20000 -- -coverage_module BabaCAD4Image.dll -fuzz_iterations 50000 -target_module BabaCAD4Image.dll -target_offset 0x1C20 -nargs 1 -- "C:\Program Files (x86)\IrfanView\i_view32.exe" @@
-target_offset: 指定被测函数在模块中的偏移
参考
https://www.apriorit.com/dev-blog/644-reverse-vulnerabilities-software-no-code-dynamic-fuzzing
https://www.gosecure.net/blog/2019/07/30/fuzzing-closed-source-pdf-viewers
http://hdwsec.fr/blog/20161208-foxit/
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