VXPC版发送群艾特消息研究

揰掵佲 · 2019-3-5 03:48:17

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首先查找到普通发送消息的call，参考文档https://bbs.pediy.com/thread-249542.htm

在VX群内，随意发送一个普通文本消息断下后观察寄存器状态
参考文章内说到，edx 为目标VXID结构 eax是个指针 ecx是个缓存

然后发送一个艾特消息，发现eax的值不再为0

输入 dd [eax] 查看 04FC6758处是目标wxid结构，
eax+4 和eax+08 相同，那么，接下来就只需要找到 eax的来源即可
向上找到
0F309AFB  |.  8D43 14    |LEA EAX, DWORD PTR DS:[EBX+0x14]
接着找ebx
0F309A53  |.  8D5E 04    LEA EBX, DWORD PTR DS:[ESI+0x4]
以此类推 eax
0F309A30  |.  8B30       MOV ESI, DWORD PTR DS:[EAX]
发现eax是来自参数1
0F309A28  |.  8B45 08    MOV EAX, [ARG.1]

0F3099E0  /$  55          PUSH EBP
0F3099E1  |.  8BEC       MOV EBP, ESP
0F3099E3  |.  6A FF       PUSH -0x1
0F3099E5  |.  68 890A0610 PUSH 10060A89
0F3099EA  |.  64:A1 0000000>MOV EAX, DWORD PTR FS:[0]
0F3099F0  |.  50          PUSH EAX
0F3099F1  |.  81EC 400D0000 SUB ESP, 0xD40
0F3099F7  |.  A1 C4704310 MOV EAX, DWORD PTR DS:[0x104370C4]    ;  &(4Y
0F3099FC  |.  33C5       XOR EAX, EBP
0F3099FE  |.  8945 EC    MOV [LOCAL.5], EAX
0F309A01  |.  53          PUSH EBX
0F309A02  |.  56          PUSH ESI
0F309A03  |.  57          PUSH EDI
0F309A04  |.  50          PUSH EAX
0F309A05  |.  8D45 F4    LEA EAX, [LOCAL.3]
0F309A08  |.  64:A3 0000000>MOV DWORD PTR FS:[0], EAX
0F309A0E  |.  8BF9       MOV EDI, ECX
0F309A10  |.  897D C8    MOV [LOCAL.14], EDI
0F309A13  |.  837F 1C 00 CMP DWORD PTR DS:[EDI+0x1C], 0x0
0F309A17  |.  8D47 18    LEA EAX, DWORD PTR DS:[EDI+0x18]
0F309A1A  |.  8945 CC    MOV [LOCAL.13], EAX
0F309A1D  |.  0F9EC0       SETLE AL
0F309A20  |.  84C0       TEST AL, AL
0F309A22  |.  0F85 29070000 JNZ 0F30A151
0F309A28  |.  8B45 08    MOV EAX, [ARG.1]
0F309A2B  |.  8B48 04    MOV ECX, DWORD PTR DS:[EAX+0x4]
0F309A2E  |.  8BD1       MOV EDX, ECX
0F309A30  |.  8B30       MOV ESI, DWORD PTR DS:[EAX]
0F309A32  |.  2BD6       SUB EDX, ESI
0F309A34  |.  B8 398EE338 MOV EAX, 0x38E38E39
0F309A39  |.  F7EA       IMUL EDX
0F309A3B  |.  C1FA 03    SAR EDX, 0x3
0F309A3E  |.  8BC2       MOV EAX, EDX
0F309A40  |.  C1E8 1F    SHR EAX, 0x1F
0F309A43  |.  03C2       ADD EAX, EDX
0F309A45  |.  0F84 06070000 JE 0F30A151
0F309A4B  |.  3BF1       CMP ESI, ECX
0F309A4D  |.  0F84 CD060000 JE 0F30A120
0F309A53  |.  8D5E 04    LEA EBX, DWORD PTR DS:[ESI+0x4]
0F309A56  |>  8B06       /MOV EAX, DWORD PTR DS:[ESI]
0F309A58  |.  48          |DEC EAX                               ;  分支 (案例 1..6)
0F309A59  |.  83F8 05    |CMP EAX, 0x5
0F309A5C  |.  0F87 A9060000 |JA 0F30A10B
0F309A62  |.  FF2485 74A130>|JMP DWORD PTR DS:[EAX*4+0xF30A174]
0F309A69  |>  8B03       |MOV EAX, DWORD PTR DS:[EBX]          ;  案例 1 --> 分支 0F309A58
0F309A6B  |.  85C0       |TEST EAX, EAX
0F309A6D  |.  74 06       |JE SHORT 0F309A75
0F309A6F  |.  66:8338 00 |CMP WORD PTR DS:[EAX], 0x0
0F309A73  |.  75 05       |JNZ SHORT 0F309A7A
0F309A75  |>  B8 083B2310 |MOV EAX, 10233B08
0F309A7A  |>  6A FF       |PUSH -0x1
0F309A7C  |.  50          |PUSH EAX
0F309A7D  |.  8D4D 88    |LEA ECX, [LOCAL.30]
0F309A80  |.  E8 2B933B00 |CALL 0F6C2DB0
0F309A85  |.  83EC 14    |SUB ESP, 0x14
0F309A88  |.  C745 FC 00000>|MOV [LOCAL.1], 0x0
0F309A8F  |.  8D45 88    |LEA EAX, [LOCAL.30]
0F309A92  |.  8BCC       |MOV ECX, ESP
0F309A94  |.  50          |PUSH EAX
0F309A95  |.  E8 56933B00 |CALL 0F6C2DF0
0F309A9A  |.  E8 C1FEFFFF |CALL 0F309960
0F309A9F  |.  83C4 14    |ADD ESP, 0x14
0F309AA2  |.  84C0       |TEST AL, AL
0F309AA4  |.  74 4D       |JE SHORT 0F309AF3
0F309AA6  |.  8B45 08    |MOV EAX, [ARG.1]
0F309AA9  |.  8B48 04    |MOV ECX, DWORD PTR DS:[EAX+0x4]
0F309AAC  |.  2B08       |SUB ECX, DWORD PTR DS:[EAX]
0F309AAE  |.  B8 398EE338 |MOV EAX, 0x38E38E39
0F309AB3  |.  F7E9       |IMUL ECX
0F309AB5  |.  C1FA 03    |SAR EDX, 0x3
0F309AB8  |.  8BC2       |MOV EAX, EDX
0F309ABA  |.  C1E8 1F    |SHR EAX, 0x1F
0F309ABD  |.  03C2       |ADD EAX, EDX
0F309ABF  |.  83F8 01    |CMP EAX, 0x1
0F309AC2  |.  0F85 28010000 |JNZ 0F309BF0
0F309AC8  |.  6A 00       |PUSH 0x0
0F309ACA  |.  6A 00       |PUSH 0x0
0F309ACC  |.  6A 00       |PUSH 0x0
0F309ACE  |.  68 0B030000 |PUSH 0x30B
0F309AD3  |.  E8 38402600 |CALL 0F56DB10
0F309AD8  |.  8BC8       |MOV ECX, EAX
0F309ADA  |.  E8 B1502600 |CALL 0F56EB90
0F309ADF  |.  8D4D 88    |LEA ECX, [LOCAL.30]
0F309AE2  |.  C745 FC FFFFF>|MOV [LOCAL.1], -0x1
0F309AE9  |.  E8 7284FEFF |CALL 0F2F1F60
0F309AEE  |.  E9 18060000 |JMP 0F30A10B
0F309AF3  |>  E8 9861FBFF |CALL 0F2BFC90
0F309AF8  |.  8B55 CC    |MOV EDX, [LOCAL.13]
0F309AFB  |.  8D43 14    |LEA EAX, DWORD PTR DS:[EBX+0x14]
0F309AFE  |.  6A 01       |PUSH 0x1
0F309B00  |.  50          |PUSH EAX
0F309B01  |.  53          |PUSH EBX
0F309B02  |.  8D8D E4F7FFFF |LEA ECX, [LOCAL.519]
0F309B08  |.  E8 13A32100 |CALL 0F523E20                         ;  这个call就是我们的发送文本的call

接下来返回上一层0F31B160  /$  55          PUSH EBP
0F31B161  |.  8BEC       MOV EBP, ESP
0F31B163  |.  6A FF       PUSH -0x1
0F31B165  |.  68 48250610 PUSH 10062548
0F31B16A  |.  64:A1 0000000>MOV EAX, DWORD PTR FS:[0]
0F31B170  |.  50          PUSH EAX
0F31B171  |.  83EC 2C    SUB ESP, 0x2C
0F31B174  |.  53          PUSH EBX
0F31B175  |.  56          PUSH ESI
0F31B176  |.  57          PUSH EDI
0F31B177  |.  A1 C4704310 MOV EAX, DWORD PTR DS:[0x104370C4]    ;  &(4Y
0F31B17C  |.  33C5       XOR EAX, EBP
0F31B17E  |.  50          PUSH EAX
0F31B17F  |.  8D45 F4    LEA EAX, [LOCAL.3]
0F31B182  |.  64:A3 0000000>MOV DWORD PTR FS:[0], EAX
0F31B188  |.  8BD9       MOV EBX, ECX
0F31B18A  |.  C745 DC 00000>MOV [LOCAL.9], 0x0
0F31B191  |.  C745 E0 00000>MOV [LOCAL.8], 0x0
0F31B198  |.  C745 E4 00000>MOV [LOCAL.7], 0x0
0F31B19F  |.  8D45 DC    LEA EAX, [LOCAL.9]
0F31B1A2  |.  C745 FC 00000>MOV [LOCAL.1], 0x0
0F31B1A9  |.  8B8B 60050000 MOV ECX, DWORD PTR DS:[EBX+0x560]
0F31B1AF  |.  50          PUSH EAX
0F31B1B0  |.  E8 1B*FFBFF CALL 0F2D80D0
0F31B1B5  |.  85C0       TEST EAX, EAX
0F31B1B7  |.  7F 7E       JG SHORT 0F31B237
0F31B1B9  |.  51          PUSH ECX
0F31B1BA  |.  8B8B 60050000 MOV ECX, DWORD PTR DS:[EBX+0x560]
0F31B1C0  |.  8BF9       MOV EDI, ECX
0F31B1C2  |.  68 D0070000 PUSH 0x7D0
0F31B1C7  |.  8B01       MOV EAX, DWORD PTR DS:[ECX]             ;  WeChatWi.102421E0
0F31B1C9  |.  FF50 44    CALL DWORD PTR DS:[EAX+0x44]
0F31B1CC  |.  8B17       MOV EDX, DWORD PTR DS:[EDI]
0F31B1CE  |.  8B*F       MOV ECX, EDI
0F31B1D0  |.  8BF0       MOV ESI, EAX
0F31B1D2  |.  FF52 3C    CALL DWORD PTR DS:[EDX+0x3C]
0F31B1D5  |.  8B8B 64050000 MOV ECX, DWORD PTR DS:[EBX+0x564]
0F31B1DB  |.  03F0       ADD ESI, EAX
0F31B1DD  |.  56          PUSH ESI
0F31B1DE  |.  8B01       MOV EAX, DWORD PTR DS:[ECX]             ;  WeChatWi.102421E0
0F31B1E0  |.  FF50 58    CALL DWORD PTR DS:[EAX+0x58]
0F31B1E3  |.  8B8B 60050000 MOV ECX, DWORD PTR DS:[EBX+0x560]
0F31B1E9  |.  99          CDQ
0F31B1EA  |.  2BC2       SUB EAX, EDX
0F31B1EC  |.  8BF0       MOV ESI, EAX
0F31B1EE  |.  8B11       MOV EDX, DWORD PTR DS:[ECX]             ;  WeChatWi.102421E0
0F31B1F0  |.  D1FE       SAR ESI, 1
0F31B1F2  |.  FF52 40    CALL DWORD PTR DS:[EDX+0x40]
0F31B1F5  |.  8B8B 60050000 MOV ECX, DWORD PTR DS:[EBX+0x560]
0F31B1FB  |.  8BF8       MOV EDI, EAX
0F31B1FD  |.  2BFE       SUB EDI, ESI
0F31B1FF  |.  8B11       MOV EDX, DWORD PTR DS:[ECX]             ;  WeChatWi.102421E0
0F31B201  |.  FF52 38    CALL DWORD PTR DS:[EDX+0x38]
0F31B204  |.  03C7       ADD EAX, EDI
0F31B206  |.  BA 16040000 MOV EDX, 0x416
0F31B20B  |.  50          PUSH EAX
0F31B20C  |.  83EC 14    SUB ESP, 0x14
0F31B20F  |.  8BCC       MOV ECX, ESP
0F31B211  |.  E8 CA8A3A00 CALL 0F6C3CE0
0F31B216  |.  8BCB       MOV ECX, EBX
0F31B218  |.  E8 F35F0000 CALL 0F321210
0F31B21D  |.  8B8B 3C050000 MOV ECX, DWORD PTR DS:[EBX+0x53C]
0F31B223  |.  6A 00       PUSH 0x0
0F31B225  |.  FFB3 60050000 PUSH DWORD PTR DS:[EBX+0x560]
0F31B22B  |.  E8 98CB5E00 CALL 0F907DC8
0F31B230  |.  32DB       XOR BL, BL
0F31B232  |.  E9 B2010000 JMP 0F31B3E9
0F31B237  |>  8B45 DC    MOV EAX, [LOCAL.9]
0F31B23A  |.  33C9       XOR ECX, ECX
0F31B23C  |.  8B55 E0    MOV EDX, [LOCAL.8]
0F31B23F  |.  3BC2       CMP EAX, EDX
0F31B241  |.  74 12       JE SHORT 0F31B255
0F31B243  |>  8338 02    /CMP DWORD PTR DS:[EAX], 0x2
0F31B246  |.  75 06       |JNZ SHORT 0F31B24E
0F31B248  |.  41          |INC ECX
0F31B249  |.  83F9 0B    |CMP ECX, 0xB
0F31B24C  |.  7D 7F       |JGE SHORT 0F31B2CD
0F31B24E  |>  83C0 24    |ADD EAX, 0x24
0F31B251  |.  3BC2       |CMP EAX, EDX
0F31B253  |.^ 75 EE       \JNZ SHORT 0F31B243
0F31B255  |>  E8 467A0000 CALL 0F322CA0
0F31B25A  |.  84C0       TEST AL, AL
0F31B25C  |.  0F84 BD000000 JE 0F31B31F
0F31B262  |.  51          PUSH ECX
0F31B263  |.  8B8B 60050000 MOV ECX, DWORD PTR DS:[EBX+0x560]
0F31B269  |.  8BF9       MOV EDI, ECX
0F31B26B  |.  68 D0070000 PUSH 0x7D0
0F31B270  |.  8B01       MOV EAX, DWORD PTR DS:[ECX]             ;  WeChatWi.102421E0
0F31B272  |.  FF50 44    CALL DWORD PTR DS:[EAX+0x44]
0F31B275  |.  8B17       MOV EDX, DWORD PTR DS:[EDI]
0F31B277  |.  8B*F       MOV ECX, EDI
0F31B279  |.  8BF0       MOV ESI, EAX
0F31B27B  |.  FF52 3C    CALL DWORD PTR DS:[EDX+0x3C]
0F31B27E  |.  8B8B 64050000 MOV ECX, DWORD PTR DS:[EBX+0x564]
0F31B284  |.  03F0       ADD ESI, EAX
0F31B286  |.  56          PUSH ESI
0F31B287  |.  8B01       MOV EAX, DWORD PTR DS:[ECX]             ;  WeChatWi.102421E0
0F31B289  |.  FF50 58    CALL DWORD PTR DS:[EAX+0x58]
0F31B28C  |.  8B8B 60050000 MOV ECX, DWORD PTR DS:[EBX+0x560]
0F31B292  |.  99          CDQ
0F31B293  |.  2BC2       SUB EAX, EDX
0F31B295  |.  8BF0       MOV ESI, EAX
0F31B297  |.  8B11       MOV EDX, DWORD PTR DS:[ECX]             ;  WeChatWi.102421E0
0F31B299  |.  D1FE       SAR ESI, 1
0F31B29B  |.  FF52 40    CALL DWORD PTR DS:[EDX+0x40]
0F31B29E  |.  8B8B 60050000 MOV ECX, DWORD PTR DS:[EBX+0x560]
0F31B2A4  |.  8BF8       MOV EDI, EAX
0F31B2A6  |.  2BFE       SUB EDI, ESI
0F31B2A8  |.  8B11       MOV EDX, DWORD PTR DS:[ECX]             ;  WeChatWi.102421E0
0F31B2AA  |.  FF52 38    CALL DWORD PTR DS:[EDX+0x38]
0F31B2AD  |.  BA 220E0000 MOV EDX, 0xE22
0F31B2B2  |>  03C7       ADD EAX, EDI
0F31B2B4  |.  50          PUSH EAX
0F31B2B5  |.  83EC 14    SUB ESP, 0x14
0F31B2B8  |.  8BCC       MOV ECX, ESP
0F31B2BA  |.  E8 218A3A00 CALL 0F6C3CE0
0F31B2BF  |.  8BCB       MOV ECX, EBX
0F31B2C1  |.  E8 4A5F0000 CALL 0F321210
0F31B2C6  |.  32DB       XOR BL, BL
0F31B2C8  |.  E9 1C010000 JMP 0F31B3E9
0F31B2CD  |>  8BBB 60050000 MOV EDI, DWORD PTR DS:[EBX+0x560]
0F31B2D3  |.  51          PUSH ECX
0F31B2D4  |.  8B*F       MOV ECX, EDI
0F31B2D6  |.  68 D0070000 PUSH 0x7D0
0F31B2DB  |.  8B01       MOV EAX, DWORD PTR DS:[ECX]             ;  WeChatWi.102421E0
0F31B2DD  |.  FF50 3C    CALL DWORD PTR DS:[EAX+0x3C]
0F31B2E0  |.  8B17       MOV EDX, DWORD PTR DS:[EDI]
0F31B2E2  |.  8B*F       MOV ECX, EDI
0F31B2E4  |.  8BF0       MOV ESI, EAX
0F31B2E6  |.  FF52 44    CALL DWORD PTR DS:[EDX+0x44]
0F31B2E9  |.  8B8B 64050000 MOV ECX, DWORD PTR DS:[EBX+0x564]
0F31B2EF  |.  03F0       ADD ESI, EAX
0F31B2F1  |.  56          PUSH ESI
0F31B2F2  |.  8B01       MOV EAX, DWORD PTR DS:[ECX]             ;  WeChatWi.102421E0
0F31B2F4  |.  FF50 58    CALL DWORD PTR DS:[EAX+0x58]
0F31B2F7  |.  8B8B 60050000 MOV ECX, DWORD PTR DS:[EBX+0x560]
0F31B2FD  |.  99          CDQ
0F31B2FE  |.  2BC2       SUB EAX, EDX
0F31B300  |.  8BF0       MOV ESI, EAX
0F31B302  |.  8B11       MOV EDX, DWORD PTR DS:[ECX]             ;  WeChatWi.102421E0
0F31B304  |.  D1FE       SAR ESI, 1
0F31B306  |.  FF52 40    CALL DWORD PTR DS:[EDX+0x40]
0F31B309  |.  8B8B 60050000 MOV ECX, DWORD PTR DS:[EBX+0x560]
0F31B30F  |.  8BF8       MOV EDI, EAX
0F31B311  |.  2BFE       SUB EDI, ESI
0F31B313  |.  8B11       MOV EDX, DWORD PTR DS:[ECX]             ;  WeChatWi.102421E0
0F31B315  |.  FF52 38    CALL DWORD PTR DS:[EDX+0x38]
0F31B318  |.  BA 21040000 MOV EDX, 0x421
0F31B31D  |.^ EB 93       JMP SHORT 0F31B2B2
0F31B31F  |>  0F57C0       XORPS XMM0, XMM0
0F31B322  |.  C745 D8 00000>MOV [LOCAL.10], 0x0
0F31B329  |.  0F1145 C8    MOVUPS DQWORD PTR SS:[EBP-0x38], XMM0
0F31B32D  |.  8D45 C8    LEA EAX, [LOCAL.14]
0F31B330  |.  C645 FC 01 MOV BYTE PTR SS:[EBP-0x4], 0x1
0F31B334  |.  8B8B 58050000 MOV ECX, DWORD PTR DS:[EBX+0x558]
0F31B33A  |.  50          PUSH EAX
0F31B33B  |.  8D45 DC    LEA EAX, [LOCAL.9]
0F31B33E  |.  81C1 E0090000 ADD ECX, 0x9E0
0F31B344  |.  50          PUSH EAX
0F31B345  |.  E8 F6F2FEFF CALL 0F30A640
0F31B34A  |.  84C0       TEST AL, AL
0F31B34C  |.  75 51       JNZ SHORT 0F31B39F
0F31B34E  |.  8845 F3    MOV BYTE PTR SS:[EBP-0xD], AL
0F31B351  |.  8B45 C8    MOV EAX, [LOCAL.14]
0F31B354  |.  85C0       TEST EAX, EAX
0F31B356  |.  74 06       JE SHORT 0F31B35E
0F31B358  |.  66:8338 00 CMP WORD PTR DS:[EAX], 0x0
0F31B35C  |.  75 05       JNZ SHORT 0F31B363
0F31B35E  |>  B8 083B2310 MOV EAX, 10233B08
0F31B363  |>  83EC 14    SUB ESP, 0x14
0F31B366  |.  8BCC       MOV ECX, ESP
0F31B368  |.  8965 EC    MOV [LOCAL.5], ESP
0F31B36B  |.  6A FF       PUSH -0x1
0F31B36D  |.  50          PUSH EAX
0F31B36E  |.  E8 3D7A3A00 CALL 0F6C2DB0
0F31B373  |.  83EC 14    SUB ESP, 0x14
0F31B376  |.  C645 FC 02 MOV BYTE PTR SS:[EBP-0x4], 0x2
0F31B37A  |.  BA 0E040000 MOV EDX, 0x40E
0F31B37F  |.  8BCC       MOV ECX, ESP
0F31B381  |.  E8 5A893A00 CALL 0F6C3CE0
0F31B386  |.  8A55 F3    MOV DL, BYTE PTR SS:[EBP-0xD]
0F31B389  |.  C645 FC 01 MOV BYTE PTR SS:[EBP-0x4], 0x1
0F31B38D  |.  8B8B 5C050000 MOV ECX, DWORD PTR DS:[EBX+0x55C]
0F31B393  |.  E8 C8370300 CALL 0F34EB60
0F31B398  |.  83C4 28    ADD ESP, 0x28
0F31B39B  |.  32DB       XOR BL, BL
0F31B39D  |.  EB 42       JMP SHORT 0F31B3E1
0F31B39F  |>  8B8B 60050000 MOV ECX, DWORD PTR DS:[EBX+0x560]
0F31B3A5  |.  E8 C6D5FBFF CALL 0F2D8970
0F31B3AA  |.  8D45 DC    LEA EAX, [LOCAL.9]
0F31B3AD  |.  50          PUSH EAX
0F31B3AE  |.  E8 ED7F0000 CALL 0F3233A0                         ;  call的位置

eax是来自一个局部变量。。
LEA EAX, DWORD PTR SS:[EBP-0x24]

在函数头下断，重新发送一个艾特消息。

0F31B1AF |. 50 PUSH EAX
0F31B1B0 |. E8 1B*FFBFF CALL 0F2D80D0 ; 经过这个call之后 ebp-0x24一出现一个结构
跟踪进入call头部下断，重新发送消息这个call比较长，所以，只需要一直F8往下走即可，到图片中的位置，发现，构建了一串数据在edx中，里面包含了，被艾特人的VXID，和昵称

0F2D844A .  C645 FC 08 MOV BYTE PTR SS:[EBP-0x4], 0x8
0F2D844E .  50          PUSH EAX                               ;  昵称
0F2D844F .  8D8D 10FFFFFF LEA ECX, DWORD PTR SS:[EBP-0xF0]       ;  ecx空白区
0F2D8455 .  E8 B6AE3E00 CALL 0F6C3310                         ;  经过call之后 ecx空白区多出了昵称结构
0F2D845A .  8D85 D4FEFFFF LEA EAX, DWORD PTR SS:[EBP-0x12C]
0F2D8460 .  50          PUSH EAX                               ;  VXID
0F2D8461 .  8D8D 44FFFFFF LEA ECX, DWORD PTR SS:[EBP-0xBC]       ;  空白区
0F2D8467 .  E8 74BDFBFF CALL 0F2941E0                         ;  经过call之后，空白区多了一串类似于call附近eax的结构
0F2D846C .  8D8D A*FEFFFF LEA ECX, DWORD PTR SS:[EBP-0x154]

dd 0x2f617c0 发现确实是 VXID。那就明白了，这个call就是构建结构的call。
那么，我们来提取一下参数

eax 是VXID结构
结构如下
$ ==> >02F196E0  UNICODE "这里是你的wxid"
$+4    >0000000E
$+8    >00000010

ecx是个缓存，也就是传一个空白区域进去即可，至少保证有3*4的长度保险点的话，取5*4好一些
结构构建完成之后，按照文章开头的参考文档，传入eax的值就可以在群内艾特人了！
所以请勿见怪。这个还不算太完美，最好是能读取被艾特人的昵称在内容中加上这样才是最完美的

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