/* # Title : Windows x86 localhost port scanner shellcode # Date : 29-07-2016 # Author : Roziul Hasan Khan Shifat # Tested on : Windows 7 x86 starter */ /* Disassembly of section .text: 00000000 <_start>: 0: 31 db xor %ebx,%ebx 2: 64 8b 43 30 mov %fs:0x30(%ebx),%eax 6: 8b 40 0c mov 0xc(%eax),%eax 9: 8b 70 14 mov 0x14(%eax),%esi c: ad lods %ds:(%esi),%eax d: 96 xchg %eax,%esi e: ad lods %ds:(%esi),%eax f: 8b 58 10 mov 0x10(%eax),%ebx 12: 31 d2 xor %edx,%edx 14: 8b 53 3c mov 0x3c(%ebx),%edx 17: 01 da add %ebx,%edx 19: 8b 52 78 mov 0x78(%edx),%edx 1c: 01 da add %ebx,%edx 1e: 8b 72 20 mov 0x20(%edx),%esi 21: 01 de add %ebx,%esi 23: 31 c9 xor %ecx,%ecx 00000025 <getp>: 25: 41 inc %ecx 26: ad lods %ds:(%esi),%eax 27: 01 d8 add %ebx,%eax 29: 81 38 47 65 74 50 cmpl $0x50746547,(%eax) 2f: 75 f4 jne 25 <getp> 31: 81 78 04 72 6f 63 41 cmpl $0x41636f72,0x4(%eax) 38: 75 eb jne 25 <getp> 3a: 81 78 08 64 64 72 65 cmpl $0x65726464,0x8(%eax) 41: 75 e2 jne 25 <getp> 43: 8b 72 1c mov 0x1c(%edx),%esi 46: 01 de add %ebx,%esi 48: 8b 14 8e mov (%esi,%ecx,4),%edx 4b: 01 da add %ebx,%edx 4d: 31 f6 xor %esi,%esi 4f: 89 d6 mov %edx,%esi 51: 89 df mov %ebx,%edi 53: 31 c9 xor %ecx,%ecx 55: 68 6c 6f 63 41 push $0x41636f6c 5a: 88 4c 24 03 mov %cl,0x3(%esp) 5e: 68 61 6c 41 6c push $0x6c416c61 63: 68 47 6c 6f 62 push $0x626f6c47 68: 54 push %esp 69: 53 push %ebx 6a: ff d2 call *%edx 6c: 83 c4 0c add $0xc,%esp 6f: 31 c9 xor %ecx,%ecx 71: b1 20 mov $0x20,%cl 73: 51 push %ecx 74: 31 c9 xor %ecx,%ecx 76: 51 push %ecx 77: ff d0 call *%eax 79: 89 f1 mov %esi,%ecx 7b: 89 c6 mov %eax,%esi 7d: 89 0e mov %ecx,(%esi) 7f: 31 c9 xor %ecx,%ecx 81: 68 65 65 41 41 push $0x41416565 86: 88 4c 24 02 mov %cl,0x2(%esp) 8a: 68 61 6c 46 72 push $0x72466c61 8f: 68 47 6c 6f 62 push $0x626f6c47 94: 54 push %esp 95: 57 push %edi 96: 8b 16 mov (%esi),%edx 98: ff d2 call *%edx 9a: 83 c4 0c add $0xc,%esp 9d: 89 46 04 mov %eax,0x4(%esi) a0: 31 c9 xor %ecx,%ecx a2: 51 push %ecx a3: 68 61 72 79 41 push $0x41797261 a8: 68 4c 69 62 72 push $0x7262694c ad: 68 4c 6f 61 64 push $0x64616f4c b2: 54 push %esp b3: 57 push %edi b4: 8b 16 mov (%esi),%edx b6: ff d2 call *%edx b8: 83 c4 0c add $0xc,%esp bb: 89 46 08 mov %eax,0x8(%esi) be: 31 c9 xor %ecx,%ecx c0: 68 6c 6c 41 41 push $0x41416c6c c5: 88 4c 24 02 mov %cl,0x2(%esp) c9: 68 72 74 2e 64 push $0x642e7472 ce: 68 6d 73 76 63 push $0x6376736d d3: 54 push %esp d4: ff d0 call *%eax d6: 83 c4 0c add $0xc,%esp d9: 89 c7 mov %eax,%edi db: 31 c9 xor %ecx,%ecx dd: 51 push %ecx de: 68 74 66 5f 73 push $0x735f6674 e3: 68 70 72 69 6e push $0x6e697270 e8: 54 push %esp e9: 50 push %eax ea: 8b 16 mov (%esi),%edx ec: ff d2 call *%edx ee: 83 c4 08 add $0x8,%esp f1: 89 46 0c mov %eax,0xc(%esi) f4: 31 c9 xor %ecx,%ecx f6: 51 push %ecx f7: 68 65 78 69 74 push $0x74697865 fc: 54 push %esp fd: 57 push %edi fe: 8b 16 mov (%esi),%edx 100: ff d2 call *%edx 102: 83 c4 08 add $0x8,%esp 105: 89 46 10 mov %eax,0x10(%esi) 108: 8b 56 08 mov 0x8(%esi),%edx 10b: 31 c9 xor %ecx,%ecx 10d: 68 64 6c 6c 41 push $0x416c6c64 112: 88 4c 24 03 mov %cl,0x3(%esp) 116: 68 6b 33 32 2e push $0x2e32336b 11b: 68 77 73 6f 63 push $0x636f7377 120: 54 push %esp 121: ff d2 call *%edx 123: 83 c4 0c add $0xc,%esp 126: 89 c7 mov %eax,%edi 128: 31 c9 xor %ecx,%ecx 12a: 68 75 70 41 41 push $0x41417075 12f: 88 4c 24 02 mov %cl,0x2(%esp) 133: 68 74 61 72 74 push $0x74726174 138: 68 57 53 41 53 push $0x53415357 13d: 54 push %esp 13e: 50 push %eax 13f: 8b 16 mov (%esi),%edx 141: ff d2 call *%edx 143: 89 46 14 mov %eax,0x14(%esi) 146: 83 c4 0c add $0xc,%esp 149: 68 65 74 41 41 push $0x41417465 14e: 31 c9 xor %ecx,%ecx 150: 88 4c 24 02 mov %cl,0x2(%esp) 154: 68 73 6f 63 6b push $0x6b636f73 159: 54 push %esp 15a: 57 push %edi 15b: 8b 16 mov (%esi),%edx 15d: ff d2 call *%edx 15f: 89 46 18 mov %eax,0x18(%esi) 162: 83 c4 08 add $0x8,%esp 165: 68 65 63 74 41 push $0x41746365 16a: 31 c9 xor %ecx,%ecx 16c: 88 4c 24 03 mov %cl,0x3(%esp) 170: 68 63 6f 6e 6e push $0x6e6e6f63 175: 54 push %esp 176: 57 push %edi 177: 8b 16 mov (%esi),%edx 179: ff d2 call *%edx 17b: 83 c4 08 add $0x8,%esp 17e: 89 46 1c mov %eax,0x1c(%esi) 181: 31 c9 xor %ecx,%ecx 183: 68 6b 65 74 41 push $0x4174656b 188: 88 4c 24 03 mov %cl,0x3(%esp) 18c: 68 65 73 6f 63 push $0x636f7365 191: 68 63 6c 6f 73 push $0x736f6c63 196: 54 push %esp 197: 57 push %edi 198: 8b 16 mov (%esi),%edx 19a: ff d2 call *%edx 19c: 83 c4 0c add $0xc,%esp 19f: 89 46 08 mov %eax,0x8(%esi) 1a2: 8b 56 14 mov 0x14(%esi),%edx 1a5: 31 c9 xor %ecx,%ecx 1a7: 66 b9 90 01 mov $0x190,%cx 1ab: 29 cc sub %ecx,%esp 1ad: 66 b9 02 02 mov $0x202,%cx 1b1: 8d 1c 24 lea (%esp),%ebx 1b4: 53 push %ebx 1b5: 51 push %ecx 1b6: ff d2 call *%edx 1b8: 31 ff xor %edi,%edi 000001ba <scan>: 1ba: 31 d2 xor %edx,%edx 1bc: b2 06 mov $0x6,%dl 1be: 52 push %edx 1bf: 83 ea 05 sub $0x5,%edx 1c2: 52 push %edx 1c3: 42 inc %edx 1c4: 52 push %edx 1c5: 8b 56 18 mov 0x18(%esi),%edx 1c8: ff d2 call *%edx 1ca: 89 c3 mov %eax,%ebx 1cc: 31 d2 xor %edx,%edx 1ce: 52 push %edx 1cf: 52 push %edx 1d0: 52 push %edx 1d1: 52 push %edx 1d2: 31 c0 xor %eax,%eax 1d4: b0 ff mov $0xff,%al 1d6: 40 inc %eax 1d7: f7 e7 mul %edi 1d9: c6 04 24 02 movb $0x2,(%esp) 1dd: 89 44 24 02 mov %eax,0x2(%esp) 1e1: 8d 14 24 lea (%esp),%edx 1e4: 31 c9 xor %ecx,%ecx 1e6: b1 10 mov $0x10,%cl 1e8: 53 push %ebx 1e9: 51 push %ecx 1ea: 52 push %edx 1eb: 53 push %ebx 1ec: 8b 46 1c mov 0x1c(%esi),%eax 1ef: ff d0 call *%eax 1f1: 5b pop %ebx 1f2: 83 c4 10 add $0x10,%esp 1f5: 31 c9 xor %ecx,%ecx 1f7: 51 push %ecx 1f8: 68 20 20 20 0a push $0xa202020 1fd: 68 3e 20 25 64 push $0x6425203e 202: 68 25 64 20 2d push $0x2d206425 207: 54 push %esp 208: 59 pop %ecx 209: 50 push %eax 20a: 57 push %edi 20b: 51 push %ecx 20c: 8b 46 0c mov 0xc(%esi),%eax 20f: ff d0 call *%eax 211: 83 c4 10 add $0x10,%esp 214: 53 push %ebx 215: 8b 46 08 mov 0x8(%esi),%eax 218: ff d0 call *%eax 21a: 47 inc %edi 21b: 83 ff 65 cmp $0x65,%edi 21e: 75 9a jne 1ba <scan> 220: 8b 46 04 mov 0x4(%esi),%eax 223: 8b 7e 10 mov 0x10(%esi),%edi 226: 56 push %esi 227: ff d0 call *%eax 229: 50 push %eax 22a: ff d7 call *%edi */ /* section .text global _start _start: xor ebx,ebx mov eax,[fs:ebx+0x30] mov eax,[eax+0xc] mov esi,[eax+0x14] lodsd xchg esi,eax lodsd mov ebx,[eax+0x10] ;kernel32.dll base address xor edx,edx mov edx,[ebx+0x3c] add edx,ebx mov edx,[edx+0x78] add edx,ebx ;IMAGE_EXPORT_DIRECTORY mov esi,[edx+0x20] add esi,ebx ;AddressOfNames xor ecx,ecx getp: inc ecx lodsd add eax,ebx cmp dword [eax],'GetP' jnz getp cmp dword [eax+4],'rocA' jnz getp cmp dword [eax+8],'ddre' jnz getp mov esi,[edx+0x1c] add esi,ebx ;AddressOfFunctions mov edx,[esi+ecx*4] add edx,ebx ;GetProcAddress() ;---------------------------------- xor esi,esi mov esi,edx ;GetProcAddress() mov edi,ebx ;kernel32 base address ;------------------------------ ;finding address of GlobalAlloc() xor ecx,ecx push 0x41636f6c mov [esp+3],byte cl push 0x6c416c61 push 0x626f6c47 push esp push ebx call edx add esp,12 ;--------------------------- ;GlobalAlloc(0x00,4*8) sizeof every function address 4 byte and i will store address of 8 functions xor ecx,ecx mov cl,32 push ecx xor ecx,ecx push ecx call eax ;-------------------------------- mov ecx,esi mov esi,eax mov [esi],dword ecx ;GetProcAddress() at offset 0 ;---------------------------------- ;finding address of GlobalFree() xor ecx,ecx push 0x41416565 mov [esp+2],byte cl push 0x72466c61 push 0x626f6c47 push esp push edi mov edx,dword [esi] call edx add esp,12 ;---------------------- mov [esi+4],dword eax ;GlobalFree() at offset 4 ;------------------------ ;finding address of LoadLibraryA() xor ecx,ecx push ecx push 0x41797261 push 0x7262694c push 0x64616f4c push esp push edi mov edx,dword [esi] call edx add esp,12 ;---------------------- mov [esi+8],dword eax ;LoadLibraryA() at offset 8 ;------------------------ ;loading msvcrt.dll xor ecx,ecx push 0x41416c6c mov [esp+2],byte cl push 0x642e7472 push 0x6376736d push esp call eax add esp,12 ;------------------------- mov edi,eax ;msvcrt.dll base address ;----------------------- ;finding address of printf() xor ecx,ecx push ecx push 0x735f6674 push 0x6e697270 push esp push eax mov edx,dword [esi] call edx add esp,8 ;---------------------- mov [esi+12],dword eax ;printf() at offset 12 ;--------------------- ;finding address of exit() xor ecx,ecx push ecx push 'exit' push esp push edi mov edx,dword [esi] call edx add esp,8 ;--------------------- mov [esi+16],dword eax ;exit() at offset 16 ;-------------------------------- ;loading wsock32.dll mov edx,dword [esi+8] xor ecx,ecx push 0x416c6c64 mov [esp+3],byte cl push 0x2e32336b push 0x636f7377 push esp call edx add esp,12 ;---------------------- mov edi,eax ;wsock32.dll ;--------------------- ;finding address of WSAStartup() xor ecx,ecx push 0x41417075 mov [esp+2],byte cl push 0x74726174 push 0x53415357 push esp push eax mov edx,dword [esi] call edx ;--------------------- mov [esi+20],dword eax ;WSAStartup() at offset 20 ;---------------------- add esp,12 ;finding address of socket() push 0x41417465 xor ecx,ecx mov [esp+2],byte cl push 0x6b636f73 push esp push edi mov edx,dword [esi] call edx ;------------------------------- mov [esi+24],dword eax ;socket() at offset 24 ;------------------------------ add esp,8 ;finding address connect() push 0x41746365 xor ecx,ecx mov [esp+3],byte cl push 0x6e6e6f63 push esp push edi mov edx,dword [esi] call edx add esp,8 ;------------------------- mov [esi+28],dword eax ;connect() at offset 28 ;--------------------------------- ;finding address of closesocket() xor ecx,ecx push 0x4174656b mov [esp+3],byte cl push 0x636f7365 push 0x736f6c63 push esp push edi mov edx,dword [esi] call edx add esp,12 ;--------------------------- mov [esi+8],dword eax ;closesocket() at offset 8 ;--------------------------------- ;------------------- ;WSAStartup(514,&wsa) mov edx,dword [esi+20] ;edx=WSAStartup() xor ecx,ecx mov cx,400 sub esp,ecx mov cx,514 lea ebx,[esp] push ebx push ecx call edx ;--------------------- xor edi,edi ;port scanning start from 0 - 100 scan: ;socket(2,1,6) xor edx,edx mov dl,6 push edx sub edx,5 push edx inc edx push edx mov edx,dword [esi+24] ;socket() call edx ;---------------------- ;connect() mov ebx,eax ;SOCKET xor edx,edx push edx push edx push edx push edx xor eax,eax mov al,255 inc eax mul edi mov [esp],byte 2 mov [esp+2],word eax ;mov [esp+4],dword 0x81e8a8c0 ;Use it to scan foreign host lea edx,[esp] xor ecx,ecx mov cl,16 push ebx push ecx push edx push ebx mov eax,[esi+28] ;connect() call eax pop ebx ;SOCKET add esp,16 xor ecx,ecx push ecx push 0x0a202020 push 0x6425203e push 0x2d206425 push esp pop ecx push eax push edi push ecx mov eax,dword [esi+12] ;printf() call eax add esp,16 push ebx ;SOCKET mov eax,dword [esi+8] ;closesocket() call eax inc edi cmp edi,101 jne scan mov eax,dword [esi+4] ;GlobalFree() mov edi,dword [esi+16] ;exit() push esi call eax push eax call edi */ #include<stdio.h> #include<string.h> char shellcode[]="\x31\xdb\x64\x8b\x43\x30\x8b\x40\x0c\x8b\x70\x14\xad\x96\xad\x8b\x58\x10\x31\xd2\x8b\x53\x3c\x01\xda\x8b\x52\x78\x01\xda\x8b\x72\x20\x01\xde\x31\xc9\x41\xad\x01\xd8\x81\x38\x47\x65\x74\x50\x75\xf4\x81\x78\x04\x72\x6f\x63\x41\x75\xeb\x81\x78\x08\x64\x64\x72\x65\x75\xe2\x8b\x72\x1c\x01\xde\x8b\x14\x8e\x01\xda\x31\xf6\x89\xd6\x89\xdf\x31\xc9\x68\x6c\x6f\x63\x41\x88\x4c\x24\x03\x68\x61\x6c\x41\x6c\x68\x47\x6c\x6f\x62\x54\x53\xff\xd2\x83\xc4\x0c\x31\xc9\xb1\x20\x51\x31\xc9\x51\xff\xd0\x89\xf1\x89\xc6\x89\x0e\x31\xc9\x68\x65\x65\x41\x41\x88\x4c\x24\x02\x68\x61\x6c\x46\x72\x68\x47\x6c\x6f\x62\x54\x57\x8b\x16\xff\xd2\x83\xc4\x0c\x89\x46\x04\x31\xc9\x51\x68\x61\x72\x79\x41\x68\x4c\x69\x62\x72\x68\x4c\x6f\x61\x64\x54\x57\x8b\x16\xff\xd2\x83\xc4\x0c\x89\x46\x08\x31\xc9\x68\x6c\x6c\x41\x41\x88\x4c\x24\x02\x68\x72\x74\x2e\x64\x68\x6d\x73\x76\x63\x54\xff\xd0\x83\xc4\x0c\x89\xc7\x31\xc9\x51\x68\x74\x66\x5f\x73\x68\x70\x72\x69\x6e\x54\x50\x8b\x16\xff\xd2\x83\xc4\x08\x89\x46\x0c\x31\xc9\x51\x68\x65\x78\x69\x74\x54\x57\x8b\x16\xff\xd2\x83\xc4\x08\x89\x46\x10\x8b\x56\x08\x31\xc9\x68\x64\x6c\x6c\x41\x88\x4c\x24\x03\x68\x6b\x33\x32\x2e\x68\x77\x73\x6f\x63\x54\xff\xd2\x83\xc4\x0c\x89\xc7\x31\xc9\x68\x75\x70\x41\x41\x88\x4c\x24\x02\x68\x74\x61\x72\x74\x68\x57\x53\x41\x53\x54\x50\x8b\x16\xff\xd2\x89\x46\x14\x83\xc4\x0c\x68\x65\x74\x41\x41\x31\xc9\x88\x4c\x24\x02\x68\x73\x6f\x63\x6b\x54\x57\x8b\x16\xff\xd2\x89\x46\x18\x83\xc4\x08\x68\x65\x63\x74\x41\x31\xc9\x88\x4c\x24\x03\x68\x63\x6f\x6e\x6e\x54\x57\x8b\x16\xff\xd2\x83\xc4\x08\x89\x46\x1c\x31\xc9\x68\x6b\x65\x74\x41\x88\x4c\x24\x03\x68\x65\x73\x6f\x63\x68\x63\x6c\x6f\x73\x54\x57\x8b\x16\xff\xd2\x83\xc4\x0c\x89\x46\x08\x8b\x56\x14\x31\xc9\x66\xb9\x90\x01\x29\xcc\x66\xb9\x02\x02\x8d\x1c\x24\x53\x51\xff\xd2\x31\xff\x31\xd2\xb2\x06\x52\x83\xea\x05\x52\x42\x52\x8b\x56\x18\xff\xd2\x89\xc3\x31\xd2\x52\x52\x52\x52\x31\xc0\xb0\xff\x40\xf7\xe7\xc6\x04\x24\x02\x89\x44\x24\x02\x8d\x14\x24\x31\xc9\xb1\x10\x53\x51\x52\x53\x8b\x46\x1c\xff\xd0\x5b\x83\xc4\x10\x31\xc9\x51\x68\x20\x20\x20\x0a\x68\x3e\x20\x25\x64\x68\x25\x64\x20\x2d\x54\x59\x50\x57\x51\x8b\x46\x0c\xff\xd0\x83\xc4\x10\x53\x8b\x46\x08\xff\xd0\x47\x83\xff\x65\x75\x9a\x8b\x46\x04\x8b\x7e\x10\x56\xff\xd0\x50\xff\xd7"; main() { printf("shellcode length %ld\n",(unsigned)strlen(shellcode)); (* (int(*)()) shellcode) (); }