forked from zhuhuibeishadiao/DllToShellCode
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathShellCode_Main.c
More file actions
270 lines (249 loc) · 10 KB
/
ShellCode_Main.c
File metadata and controls
270 lines (249 loc) · 10 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
// ShellCode_Main.cpp : 定义控制台应用程序的入口点。
//
#include "shellcode_base.h"
#include <stdio.h>
#include <tchar.h>
#include <stdint.h>
#ifndef UNPACK_ERROR
# define UNPACK_ERROR ((unsigned int) (-1))
#endif // UNPACK_ERROR
#define cast(t, p) ((t)((uint8_t *)(p)))
#define cast_offset(t, p , o) ((t)((uint8_t *)(p) + (o)))
typedef BOOL(__stdcall *pfnDllMain)(HMODULE, DWORD, LPVOID);
typedef unsigned int (__cdecl * _unpack)(const void *source, unsigned int srclen, void *destination, unsigned int dstlen);
#pragma pack(push)
#pragma pack(1)
typedef struct main_config {
uint8_t invokeMode; // 0 = 调用dllmain lpReserved[param], 1 = 返回导出函数地址
uint32_t depackCodeOffset; // 解压缩代码偏移 偏移量基于main_config开始
uint32_t unpackSize; // 未压缩时的大小
uint32_t packedSize; // 压缩后的大小
uint32_t dllDataOffset; // dll数据偏移 偏移量基于main_config开始
char param[100]; // dllmain参数或导出函数名称
} main_config_t, *main_config_p;
#pragma pack(pop)
// 防止VS自带的宏替换
#ifdef RtlZeroMemory
# undef RtlZeroMemory
#endif // RtlZeroMemory
#ifdef RtlMoveMemory
# undef RtlMoveMemory
#endif // RtlMoveMemory
typedef struct Func {
// kernel32
_GetProcAddress GetProcAddress;
_LoadLibraryA LoadLibraryA;
_VirtualAlloc VirtualAlloc;
_VirtualFree VirtualFree;
_lstrcmpiA lstrcmpiA;
// ntdll
_RtlZeroMemory RtlZeroMemory;
_RtlMoveMemory RtlMoveMemory;
} func_t, *func_p;
#ifdef __cplusplus
extern "C" {
#endif // __cplusplus
void *main_entry();
void *main_main();
void main_end();
void init_func(func_p func);
int memory_loadlibrary(func_p func, void *dll_buf, void *dll_param, char *export_name, void **function);
#ifdef __cplusplus
}
#endif // __cplusplus
void *main_entry() {
return main_main();
};
void init_func(func_p func) {
HMODULE kernel32 = get_kernel32_base();
func->GetProcAddress = (_GetProcAddress)get_proc_address_from_hash(kernel32, GetProcAddress_Hash, 0);
func->LoadLibraryA = (_LoadLibraryA)get_proc_address_from_hash(kernel32, LoadLibraryA_Hash, func->GetProcAddress);
func->VirtualAlloc = (_VirtualAlloc)get_proc_address_from_hash(kernel32, VirtualAlloc_Hash, func->GetProcAddress);
func->VirtualFree = (_VirtualFree)get_proc_address_from_hash(kernel32, VirtualFree_Hash, func->GetProcAddress);
func->lstrcmpiA = (_lstrcmpiA)get_proc_address_from_hash(kernel32, lstrcmpiA_Hash, func->GetProcAddress);
char s[] = { 'n', 't', 'd', 'l', 'l', 0 };
HMODULE ntdll = func->LoadLibraryA(s);
func->RtlZeroMemory = (_RtlZeroMemory)get_proc_address_from_hash(ntdll, RtlZeroMemory_Hash, func->GetProcAddress);
func->RtlMoveMemory = (_RtlMoveMemory)get_proc_address_from_hash(ntdll, RtlMoveMemory_Hash, func->GetProcAddress);
}
int memory_loadlibrary(func_p func, void *dll_buf, void *dll_param, char *export_name, void **function) {
if (dll_buf == 0) return 0;
// check pe format
PIMAGE_DOS_HEADER dosh = cast(PIMAGE_DOS_HEADER, dll_buf);
if (dosh->e_magic != IMAGE_DOS_SIGNATURE) return 0;
PIMAGE_NT_HEADERS nth = cast_offset(PIMAGE_NT_HEADERS, dll_buf, dosh->e_lfanew);
if (nth->Signature != IMAGE_NT_SIGNATURE) return 0;
#ifdef _WIN64
if (nth->FileHeader.Machine != IMAGE_FILE_MACHINE_AMD64 ||
nth->OptionalHeader.Magic != IMAGE_NT_OPTIONAL_HDR64_MAGIC) return 0;
#else
if (nth->FileHeader.Machine != IMAGE_FILE_MACHINE_I386 ||
nth->OptionalHeader.Magic != IMAGE_NT_OPTIONAL_HDR32_MAGIC) return 0;
#endif
// fix section
void *base = func->VirtualAlloc(0, nth->OptionalHeader.SizeOfImage, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
if (base == 0) return 0;
// copy dos and nt header
func->RtlMoveMemory(base, dll_buf, nth->OptionalHeader.SizeOfHeaders);
dosh = cast(PIMAGE_DOS_HEADER, base);
nth = cast_offset(PIMAGE_NT_HEADERS, base, dosh->e_lfanew);
PIMAGE_SECTION_HEADER sectionh = cast_offset(PIMAGE_SECTION_HEADER, nth, sizeof(IMAGE_NT_HEADERS));
for (int i = 0; i < nth->FileHeader.NumberOfSections; i++) {
if (sectionh[i].VirtualAddress == 0) continue;
void *seek = cast_offset(void *, base, sectionh[i].VirtualAddress);
void *old = cast_offset(void *, dll_buf, sectionh[i].PointerToRawData);
if (sectionh[i].SizeOfRawData != 0) {
func->RtlMoveMemory(seek, old, sectionh[i].SizeOfRawData);
} else {
if (nth->OptionalHeader.SectionAlignment > 0)
func->RtlZeroMemory(seek, nth->OptionalHeader.SectionAlignment);
}
}
// fix reloc
PIMAGE_DATA_DIRECTORY dataDict = &nth->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC];
if (dataDict->VirtualAddress != 0 && dataDict->Size != 0) {
PIMAGE_BASE_RELOCATION reloc = cast_offset(PIMAGE_BASE_RELOCATION, base, dataDict->VirtualAddress);
while (reloc->VirtualAddress + reloc->SizeOfBlock != 0) {
uint16_t *relocData = cast_offset(uint16_t *, reloc, sizeof(IMAGE_BASE_RELOCATION));
int relocCount = (reloc->SizeOfBlock - sizeof(IMAGE_BASE_RELOCATION)) / sizeof(uint16_t);
for (int i = 0; i < relocCount; i++) {
if ((relocData[i] >> 12) == IMAGE_REL_BASED_HIGHLOW) {
uint32_t *address = (uint32_t *)((uint8_t *)base + reloc->VirtualAddress + (relocData[i] & 0x0FFF));
*address += (uint32_t)base - (uint32_t)nth->OptionalHeader.ImageBase;
}
#ifdef _WIN64
if ((relocData[i] >> 12) == IMAGE_REL_BASED_DIR64) {
uint64_t *address = (uint64_t *)((uint8_t *)base + reloc->VirtualAddress + (relocData[i] & 0x0FFF));
*address += (uint64_t)base - (uint64_t)nth->OptionalHeader.ImageBase;
}
#endif
}
reloc = cast_offset(PIMAGE_BASE_RELOCATION, reloc, reloc->SizeOfBlock);
}
}
// fix import table
dataDict = &nth->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT];
if (dataDict->VirtualAddress != 0 && dataDict->Size != 0) {
PIMAGE_IMPORT_DESCRIPTOR importDesc = cast_offset(PIMAGE_IMPORT_DESCRIPTOR, base, dataDict->VirtualAddress);
for (; importDesc->Name != 0; importDesc++) {
char *dllname = cast_offset(char *, base, importDesc->Name);
HMODULE dllHandle = func->LoadLibraryA(dllname);
if (dllHandle == 0) {
func->VirtualFree(base, nth->OptionalHeader.SizeOfImage, MEM_DECOMMIT);
return 0;
}
PIMAGE_THUNK_DATA orignThunk = cast_offset(PIMAGE_THUNK_DATA, base,
importDesc->OriginalFirstThunk != 0 ? importDesc->OriginalFirstThunk : importDesc->FirstThunk);
PIMAGE_THUNK_DATA iatThunk = cast_offset(PIMAGE_THUNK_DATA, base, importDesc->FirstThunk);
for (; orignThunk->u1.AddressOfData != 0; orignThunk++, iatThunk++) {
void *function = 0;
char *funcName = 0;
if (IMAGE_SNAP_BY_ORDINAL(orignThunk->u1.Ordinal)) {
funcName = (char *)IMAGE_ORDINAL(orignThunk->u1.Ordinal);
} else {
PIMAGE_IMPORT_BY_NAME iba = cast_offset(PIMAGE_IMPORT_BY_NAME, base, orignThunk->u1.AddressOfData);
funcName = iba->Name;
}
function = func->GetProcAddress(dllHandle, funcName);
#ifdef _WIN64
iatThunk->u1.Function = (uint64_t)function;
#else
iatThunk->u1.Function = (uint32_t)function;
#endif
}
}
}
// invoke tls callback
dataDict = &nth->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_TLS];
if (dataDict->VirtualAddress != 0) {
PIMAGE_TLS_DIRECTORY tls = cast_offset(PIMAGE_TLS_DIRECTORY, base, dataDict->VirtualAddress);
PIMAGE_TLS_CALLBACK *callback = (PIMAGE_TLS_CALLBACK *)tls->AddressOfCallBacks;
while (callback != 0) {
(*callback)(base, DLL_PROCESS_ATTACH, 0);
callback++;
}
}
// call entry
pfnDllMain dllmain = cast_offset(pfnDllMain, base, nth->OptionalHeader.AddressOfEntryPoint);
if (dllmain != 0) {
dllmain(base, DLL_PROCESS_ATTACH, dll_param);
}
// get export function address
if (export_name == 0 || function == 0) return 1;
*function = 0;
dataDict = &nth->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT];
if (dataDict->VirtualAddress != 0 && dataDict->Size != 0) {
PIMAGE_EXPORT_DIRECTORY exportDict = cast_offset(PIMAGE_EXPORT_DIRECTORY, base, dataDict->VirtualAddress);
if (exportDict->NumberOfNames == 0) return 1;
uint32_t *fn = cast_offset(uint32_t *, base, exportDict->AddressOfNames);
uint32_t *fa = cast_offset(uint32_t *, base, exportDict->AddressOfFunctions);
uint16_t *ord = cast_offset(uint16_t *, base, exportDict->AddressOfNameOrdinals);
for (uint32_t i = 0; i < exportDict->NumberOfFunctions; i++) {
char *name = cast_offset(char *, base, fn[i]);
if (func->lstrcmpiA(name, export_name) == 0) {
*function = cast_offset(void *, base, fa[ord[i]]);
break;
}
}
}
return 1;
}
void *main_main() {
func_t func;
init_func(&func);
main_config_p config = (main_config_p)(get_delta() + (uint8_t *)main_end);
void *dllData = (void *)((uint8_t *)config + config->dllDataOffset);
void *function = 0;
int needFree = 0;
// 解压
if (config->depackCodeOffset != 0) {
_unpack unpack = (_unpack)((uint8_t *)config + config->depackCodeOffset);
void *unpackedData = func.VirtualAlloc(0, config->unpackSize, MEM_COMMIT, PAGE_READWRITE);
if (unpackedData == 0) return 0;
unsigned int ret = unpack(dllData, config->packedSize, unpackedData, config->unpackSize);
if (ret == UNPACK_ERROR || ret != config->unpackSize) {
func.VirtualFree(unpackedData, config->unpackSize, MEM_DECOMMIT);
return 0;
}
dllData = unpackedData;
needFree = 1;
}
if (config->invokeMode == 0) {
memory_loadlibrary(&func, dllData, config->param, 0, &function);
} else {
memory_loadlibrary(&func, dllData, 0, config->param, &function);
}
if (needFree != 0)
func.VirtualFree(dllData, config->unpackSize, MEM_DECOMMIT);
return function;
};
void main_end() {
};
#ifdef _WIN64
# define OUT_FILE_NAME "main_x64.bin"
#else
# define OUT_FILE_NAME "main_x86.bin"
#endif
#define HASH(x) printf("#define %s_Hash 0x%X\n", x, calc_hash(x))
int _tmain(int argc, _TCHAR* argv[])
{
//HASH("RtlZeroMemory");
//HASH("RtlCopyMemory");
//HASH("lstrcmpiA");
//HASH("RtlMoveMemory");
uint8_t *start = (uint8_t *)main_entry;
uint8_t *end = (uint8_t *)main_end;
size_t size = end - start;
printf("[*] main shellcode start = %p, end = %p, size = %d\n", start, end, size);
FILE *file = 0;
fopen_s(&file, OUT_FILE_NAME, "wb");
if (file == 0) {
printf("[!] create out file error. file name = %s\n", OUT_FILE_NAME);
return 0;
}
fwrite(start, 1, size, file);
fflush(file);
fclose(file);
printf("[*] generate main shellcode sucess.\n");
return 0;
}