Reverse Code Engineering RCE CD +sandman 2000

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Assembly Source File | 1998-12-12 | 8.2 KB | 391 lines

.386 locals jumps .model flat,STDCALL include win32.inc include wsock32.inc ;--------------------------------------------------------------------- L equ <LARGE> WM_LISTSOCKET EQU WM_USER+100 IDD_TOTUSER EQU 1000 IDD_EXIT EQU 1003 IDI_ICON1 EQU 100 TRUE EQU 1 FALSE EQU 0 NULL EQU 0 ;----------- .data szTitleName db 'CrueChat 1.1 - Server version',0 msg MSGSTRUCT <?> wc WNDCLASS <?> wsadata WSAdata <?> sin sockaddr_in <?> szNULL db 0 ymenu dd 0 hInst dd 0 hMenu dd 0 hDlg dd 0 dlg_start db 'DLG_START',0 sockdes db 4000 dup (0) ;Can handle 1000 (1000*4 = 4000) connections. listsock dd 0 PORT dd 1024 Connections dd 0 Connectionsstr db '0',5 dup (0) ReadBuffer db 256 dup (0) Hex2Dec db '%-4i',0 temp dd 0 LengthOfString dd 0 .code ;--------------------------------------------------------- ; This is where control is received from the loader. ;--------------------------------------------------------- start: push 0 call GetModuleHandle mov [hInst], eax push offset wsadata ;Set things up push 0101h call WSAStartup mov sin.sin_family, AF_INET ;Convert the PORT push PORT call htons mov sin.sin_port,ax push offset szTitleName ;We dont want more than one copy of the server program running push 0 call FindWindow or eax,eax jz reg_class ret reg_class: mov [wc.clsStyle], CS_HREDRAW + CS_VREDRAW + CS_GLOBALCLASS mov [wc.clsLpfnWndProc], offset WndProc mov [wc.clsCbClsExtra], 0 mov [wc.clsCbWndExtra], 0 mov eax, [hInst] mov [wc.clsHInstance], eax push IDI_ICON1 push eax call LoadIcon mov [wc.clsHIcon], eax push L IDC_ARROW push L 0 call LoadCursor mov [wc.clsHCursor], eax push 0 push offset Main_DlgProc push 0 push offset dlg_start push [hInst] call DialogBoxParamA jmp finish msg_loop: push L 0 push L 0 push L 0 push offset msg call GetMessage cmp ax, 0 je end_loop push offset msg call TranslateMessage push offset msg call DispatchMessage jmp msg_loop end_loop: push [msg.msWPARAM] call ExitProcess ;---------------------------------------------------------------------------- ; In this part we will put the events we want to respond on. ; Key, MouseButtons, Resize, Menu, Commands.... (look at the win32.inc) ; You can leave the above without changes a modify the next part only ;---------------------------------------------------------------------------- WndProc proc hwnd:DWORD, wmsg:DWORD, wparam:DWORD, lparam:DWORD push esi push edi push ebx jmp defwndproc defwndproc: push [lparam] push [wparam] push [wmsg] push [hwnd] call DefWindowProc jmp finish finish: pop ebx pop edi pop esi ret WndProc endp public WndProc ;---------------------- ;Main Dialog ;---------------------- Main_DlgProc proc hwnd:DWORD, wmsg:DWORD, wparam:DWORD, lparam:DWORD push ebx push esi push edi cmp [wmsg],WM_LISTSOCKET je socket_event cmp [wmsg],WM_COMMAND je main_command cmp [wmsg],WM_INITDIALOG je main_init cmp [wmsg], WM_CLOSE je main_dlgdestroy mov eax,FALSE main_finish: pop edi pop esi pop ebx ret socket_event: mov eax,lparam ;FD_ACCEPT? cmp ax,FD_ACCEPT jne go_on shr eax,16 xor ebx,ebx call CheckSocketList ;Find the next empty spot in our SocketHandle array to save away this new SocketHandle push 0 push 0 push [listsock] call accept ;Accept the connection inc Connections mov [edi],eax push offset Connections push offset Hex2Dec push offset Connectionsstr call wvsprintfA push offset Connectionsstr push IDD_TOTUSER push [hwnd] call SetDlgItemTextA jmp go_on go_on: mov eax,lparam ;FD_READ? cmp ax,FD_READ jne go_on2 mov eax,wparam xor ebx,ebx mov bx,ax mov temp,ebx ;temp holds the SocketHandle of the Client program we're recieving from push 0 push 256 push offset ReadBuffer push ebx call recv cmp eax,-1 je go_on2 lea esi,ReadBuffer lea edi,ReadBuffer mov ecx,eax XorLoop: ;Our MEGA-COOL encryption algorithm xor byte ptr [edi],19 inc edi loop XorLoop ; lea edi,ReadBuffer ;Add a linefeed ; add edi,eax ; mov byte ptr [edi],13 ; mov byte ptr [edi+1],10 lea edi,sockdes ;Edi points to the array of connected SocketHandles. ; add eax,2 mov LengthOfString,eax mov ebx,temp SendMore: cmp dword ptr [edi],ebx ;Is this the SocketHandle we got the info from? jne PerhapsSend ;If not, continue add edi,4 ;Dont send the string to the SocketHandle we got it from jmp SendMore PerhapsSend: cmp dword ptr [edi],0 ;Have we processed all the SocketHandle's`? je Senteverything ;If so, then we're done push 0 ;Else, send the string to the SocketHandle that EDI points to push LengthOfString push offset ReadBuffer push dword ptr [edi] call send add edi,4 jmp SendMore Senteverything: mov al,0 ;Clear the string mov ecx,256 lea edi,ReadBuffer rep stosb go_on2: cmp ax,FD_CLOSE ;FD_CLOSE msg? jne go_on3 mov eax,wparam xor ebx,ebx mov bx,ax call CheckSocketList ;Get where in the SocketHandle array the current Handle is. mov dword ptr [edi],0 ;Remove it from the list! push ebx ;Close down the socket call closesocket dec Connections push offset Connections push offset Hex2Dec push offset Connectionsstr call wvsprintfA push offset Connectionsstr push IDD_TOTUSER push [hwnd] call SetDlgItemTextA go_on3: mov eax,TRUE jmp main_finish main_init: push 0 ;Create the socket that will listen for incoming connections push SOCK_STREAM push PF_INET call socket mov listsock,eax push FD_ACCEPT+FD_READ+FD_CLOSE ;The msg's we want to respond on push WM_LISTSOCKET push [hwnd] push [listsock] call WSAAsyncSelect push 16 ;We must bind this socket in order to use if for listening purposes push offset sin push [listsock] call bind push 2 ;Start listening push [listsock] call listen push offset Connectionsstr push IDD_TOTUSER push [hwnd] call SetDlgItemTextA mov eax,TRUE jmp main_finish main_command: cmp [wparam],IDD_EXIT jne main_nothing main_dlgdestroy: push [listsock] ;Close the listening socket call closesocket lea edi,sockdes ;Close all the connected sockets as well CheckOpenSockets: cmp dword ptr [edi],0 je ClosedAllSockets push edi call closesocket add edi,4 jmp CheckOpenSockets ClosedAllSockets: call WSACleanup ;Clean up the mess we created push L 0 push [hwnd] call EndDialog mov eax,TRUE jmp main_finish main_nothing: mov eax,FALSE jmp main_finish Main_DlgProc endp ;*** EXTERNAL PROCEDURES *** CheckSocketList: lea edi,sockdes-4 CheckMoreSocket: add edi,4 cmp [edi],ebx jne CheckMoreSocket ret public Main_DlgProc end start