MT4客户端225通讯协议分析。
通过对send下断,找到第一个发送的数据包,即登录内容,通过调用栈往上找到关键的函数调用,登录函数接收以下4个参数
(1) 用户ID(int) (2) 密码(pchar) (3) 0 (4) 0
相关代码如下
_text:00434AD0 sub esp, 0A8h
_text:00434AD6 push ebx
_text:00434AD7 push ebp
_text:00434AD8 push esi
_text:00434AD9 mov esi, ecx
_text:00434ADB push edi
_text:00434ADC xor ebx, ebx
_text:00434ADE mov ecx, 6
_text:00434AE3 xor eax, eax
_text:00434AE5 lea edi, [esp+0B8h+var_A7]
_text:00434AE9 mov [esp+0B8h+buf], bl
_text:00434AED rep stosd
_text:00434AEF mov ebp, [esp+0B8h+arg_4]
_text:00434AF6 stosw
_text:00434AF8 cmp ebp, ebx
_text:00434AFA stosb
_text:00434AFB jz loc_0_434CFA
_text:00434B01 cmp dword ptr [esp+0B8h+ArgList], 1
(1是MT4的默认管理员, 不能用于客户端登录)
_text:00434B09 jl loc_0_434CFA
_text:00434B0F mov edi, ebp
_text:00434B11 or ecx, 0FFFFFFFFh
_text:00434B14 xor eax, eax
_text:00434B16 repne scasb
_text:00434B18 not ecx
_text:00434B1A dec ecx
_text:00434B1B cmp ecx, 1
_text:00434B1E jb loc_0_434CFA
_text:00434B24 cmp dword ptr [esi+4], 0FFFFFFFFh
_text:00434B28 jnz short loc_0_434B3C
_text:00434B2A pop edi
_text:00434B2B pop esi
_text:00434B2C pop ebp
_text:00434B2D mov eax, 6
_text:00434B32 pop ebx
_text:00434B33 add esp, 0A8h
_text:00434B39 retn 10h
_text:00434B3C
_text:00434B3C
_text:00434B3C loc_0_434B3C:
_text:00434B3C lea ecx, [esp+0B8h+var_6C]
_text:00434B40 call sub_0_433A10
_text:00434B45 mov edi, ebp
_text:00434B47 or ecx, 0FFFFFFFFh
_text:00434B4A xor eax, eax
_text:00434B4C repne scasb
_text:00434B4E not ecx
_text:00434B50 dec ecx
_text:00434B51 push ecx
_text:00434B52 push ebp
_text:00434B53 lea ecx, [esp+0C0h+var_6C]
_text:00434B57 call sub_0_433A40
_text:00434B5C lea ecx, [esp+0B8h+var_6C]
_text:00434B60 call sub_0_433B20
_text:00434B65 lea edi, [esi+18Ch]
_text:00434B6B lea ecx, [esp+0B8h+var_6C]
_text:00434B6F push edi
_text:00434B70 call sub_0_433BA0
_text:00434B75 mov eax, edi
_text:00434B77 mov ecx, [eax]
_text:00434B79 mov [esp+0B8h+var_8C], ecx
_text:00434B7D mov edx, [eax+4]
_text:00434B80 mov [esp+0B8h+var_88], edx
_text:00434B84 mov ecx, [eax+8]
_text:00434B87 mov [esp+0B8h+var_84], ecx
_text:00434B8B mov edx, [eax+0Ch]
_text:00434B8E xor eax, eax
_text:00434B90 mov [esp+0B8h+var_80], edx
_text:00434B94
_text:00434B94 loc_0_434B94:
_text:00434B94 mov dl, [edi+eax]
_text:00434B97 mov cl, byte ptr [esp+eax+0B8h+var_8C]
_text:00434B9B add dl, bl
_text:00434B9D xor dl, cl
_text:00434B9F movsx ebp, cl
_text:00434BA2 mov byte ptr [esp+eax+0B8h+var_8C], dl
_text:00434BA6 inc eax
_text:00434BA7 cmp eax, 10h
_text:00434BAA mov ebx, ebp
_text:00434BAC jl short loc_0_434B94
_text:00434BAE mov edi, [esp+0B8h+arg_8]
_text:00434BB5 mov eax, edi
_text:00434BB7 dec eax
_text:00434BB8 neg eax
_text:00434BBA sbb al, al
_text:00434BBC xor ebx, ebx
_text:00434BBE and al, 0F5h
_text:00434BC0 push ebx
_text:00434BC1 add al, 0Bh
_text:00434BC3 mov [esp+0BCh+buf], al
_text:00434BC7 call ds:time
_text:00434BCD mov ecx, [esp+0BCh+var_8C]
_text:00434BD1 mov edx, [esp+0BCh+var_88]
_text:00434BD5 mov ebp, dword ptr [esp+0BCh+ArgList]
_text:00434BDC add esp, 4
_text:00434BDF cmp edi, 2
_text:00434BE2 mov [esp+0B8h+var_A5], ecx
_text:00434BE6 mov ecx, [esp+0B8h+var_80]
_text:00434BEA mov [esp+0B8h+var_A1], edx
_text:00434BEE setz dl
_text:00434BF1 mov [esp+0B8h+var_A7], al
_text:00434BF5 mov eax, [esp+0B8h+var_84]
_text:00434BF9 mov [esp+0B8h+var_99], ecx
_text:00434BFD mov [esp+0B8h+var_8D], dl
_text:00434C01 mov edx, 1Bh
_text:00434C06 lea ecx, [esp+0B8h+var_A7]
_text:00434C0A mov [esp+0B8h+var_A6], bl
_text:00434C0E mov [esp+0B8h+var_95], ebp
_text:00434C12 mov [esp+0B8h+var_9D], eax
_text:00434C16 mov [esp+0B8h+var_91], 190h
_text:00434C1D mov [esp+0B8h+var_8F], 0E1h
_text:00434C24 call sub_0_433990
_text:00434C29 lea eax, [esp+0B8h+buf]
_text:00434C2D push 1Ch
_text:00434C2F push eax
_text:00434C30 mov ecx, esi
_text:00434C32 call sub_0_50AD60
_text:00434C37 cmp eax, 1
_text:00434C3A jz short loc_0_434C55
_text:00434C3C mov ecx, esi
_text:00434C3E call sub_0_508240
_text:00434C43 pop edi
_text:00434C44 pop esi
_text:00434C45 pop ebp
_text:00434C46 mov eax, 2
_text:00434C4B pop ebx
_text:00434C4C add esp, 0A8h
_text:00434C52 retn 10h
_text:00434C55
_text:00434C55
_text:00434C55 loc_0_434C55:
_text:00434C55 mov ecx, esi
_text:00434C57 mov [esi+1BCh], ebp
_text:00434C5D call sub_0_50B710
_text:00434C62 mov edi, eax
_text:00434C64 cmp edi, ebx
_text:00434C66 jz short loc_0_434C88
_text:00434C68 cmp edi, 0Ah
_text:00434C6B jz short loc_0_434C79
_text:00434C6D cmp edi, 0Bh
_text:00434C70 jz short loc_0_434C79
_text:00434C72 mov ecx, esi
_text:00434C74 call sub_0_508240
_text:00434C79
_text:00434C79 loc_0_434C79:
_text:00434C79
_text:00434C79 mov eax, edi
_text:00434C7B pop edi
_text:00434C7C pop esi
_text:00434C7D pop ebp
_text:00434C7E pop ebx
_text:00434C7F add esp, 0A8h
_text:00434C85 retn 10h
_text:00434C88
_text:00434C88
_text:00434C88 loc_0_434C88:
_text:00434C88 lea ecx, [esp+0B8h+var_8C]
_text:00434C8C push 1
_text:00434C8E push ecx
_text:00434C8F mov ecx, esi
_text:00434C91 mov [esi+1ACh], ebx
_text:00434C97 mov [esi+1B0h], ebx
_text:00434C9D mov [esi+1B4h], ebx
_text:00434CA3 mov [esi+1B8h], ebx
_text:00434CA9 call sub_0_50AE20
_text:00434CAE lea edx, [esi+1C0h]
_text:00434CB4 push 2
_text:00434CB6 push edx
_text:00434CB7 mov ecx, esi
_text:00434CB9 call sub_0_50AE20
_text:00434CBE lea eax, [esi+1C4h]
_text:00434CC4 push 4
_text:00434CC6 push eax
_text:00434CC7 mov ecx, esi
_text:00434CC9 call sub_0_50AE20
_text:00434CCE cmp [esp+0B8h+arg_C], ebx
_text:00434CD5 jnz short loc_0_434CEB
_text:00434CD7 push ebp
_text:00434CD8 push offset aDLogin
_text:00434CDD push ebx
_text:00434CDE push offset stru_0_596558
_text:00434CE3 call sub_0_4AA400
_text:00434CE8 add esp, 10h
_text:00434CEB
_text:00434CEB loc_0_434CEB:
_text:00434CEB pop edi
_text:00434CEC pop esi
_text:00434CED pop ebp
_text:00434CEE xor eax, eax
_text:00434CF0 pop ebx
_text:00434CF1 add esp, 0A8h
_text:00434CF7 retn 10h
_text:00434CFA
_text:00434CFA
_text:00434CFA loc_0_434CFA:
_text:00434CFA
_text:00434CFA pop edi
_text:00434CFB pop esi
_text:00434CFC pop ebp
_text:00434CFD mov eax, 3
_text:00434D02 pop ebx
_text:00434D03 add esp, 0A8h
_text:00434D09 retn 10h
_text:00434D09 UserLogin endp
_text:00434D09
_text:00434D09
_text:00434D0C align 10h
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根据分析整理出登录数据包的结构如下
#pragma pack(push,1)
struct MT4_LOGIN_tag
{
char First;
char Random;
char UnKnow;
char MD5Codes[16];
int Login;
short Version;
short Build;
char ClientType;
}
#pragma pack(pop)
对于要发送的数据包, 整个数据包从第2字节开始进行了一次变换, 在00434C24处调用子函数sub_0_433990进行处理, 相关分析如下
_text:00433990 push esi
_text:00433991 mov esi, ecx
_text:00433993 xor ecx, ecx
_text:00433995 push edi
_text:00433996 test esi, esi
_text:00433998 mov edi, edx
_text:0043399A jz short loc_0_4339C0
_text:0043399C xor eax, eax
_text:0043399E test edi, edi
_text:004339A0 jle short loc_0_4339C0
_text:004339A2
_text:004339A2 loc_0_4339A2:
_text:004339A2 mov edx, eax
_text:004339A4 and edx, 0Fh
_text:004339A7 mov dl, ds:byte_0_56B734[edx*4]
_text:004339AE add dl, cl
_text:004339B0 mov cl, [eax+esi]
_text:004339B3 xor cl, dl
_text:004339B5 mov [eax+esi], cl
_text:004339B8 inc eax
_text:004339B9 cmp eax, edi
_text:004339BB movsx ecx, cl
_text:004339BE jl short loc_0_4339A2
_text:004339C0
_text:004339C0 loc_0_4339C0:
_text:004339C0
_text:004339C0 pop edi
_text:004339C1 pop esi
_text:004339C2 retn
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根据以上信息既可以模拟程序去发送登录数据包。
转自:https://blog.csdn.net/mt4develop/article/details/51250318