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https://github.com/vxunderground/MalwareSourceCode
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67 lines
1.8 KiB
NASM
67 lines
1.8 KiB
NASM
; Interface to RS232INT.EXE module
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CODESEG SEGMENT PARA PUBLIC 'CODE'
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PUBLIC REFRESH
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PUBLIC SETSENSE
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PUBLIC SENDBREAK
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PUBLIC BUFSIZE
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PUBLIC RECEIVE
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PUBLIC SEND
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;
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; TABLE OFF ADDRESSES TO BE FILLED FOR JUMPS
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SZ DW 0
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FIRST DW ?
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SB DW 10H
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DW ?
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BF DW 20H
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DW ?
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RC DW 30H
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DW ?
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SN DW 40H
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DW ?
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REFRESH PROC FAR
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ASSUME CS:CODESEG
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SEGAD EQU 4F0H ;ADDRESS IN INTRA AREA OF SEG ADDRESS
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CHNAD EQU 4F2H ;ADDRESS IN INTRA AREA OF CHAN # OFFSET
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PUSH AX
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PUSH BX
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PUSH DS
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MOV AX,0 ;SET DS TO 0
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MOV DS,AX
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MOV AX,DS:[SEGAD] ;GET SEG ADDRESS IN AX
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MOV BX,0
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LUPE: MOV FIRST[BX],AX ;STORE IN ADDR TABLE
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ADD BX,4
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CMP BX,20
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JNE LUPE ;MODIFY 5 ADDRESSES
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MOV BX,DS:[CHNAD] ;GET CHAN # OFFSET IN BX
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MOV DS,AX ;NOW SET DATA SEG TO LOADED CODE
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MOV BYTE PTR [BX],0 ;ZERO CHAN#
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POP DS
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POP BX
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POP AX
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RET
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REFRESH ENDP
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;
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SETSENSE PROC FAR
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JMP DWORD PTR SZ ;GO TO LOADED CODE ENTRY POINT
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SETSENSE ENDP
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;
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SENDBREAK PROC FAR
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JMP DWORD PTR SB ;GO TO LOADED CODE ENTRY POINT
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SENDBREAK ENDP
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;
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BUFSIZE PROC FAR
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JMP DWORD PTR BF ;GO TO LOADED CODE ENTRY POINT
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BUFSIZE ENDP
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;
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RECEIVE PROC FAR
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JMP DWORD PTR RC ;GO TO LOADED CODE ENTRY POINT
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RECEIVE ENDP
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;
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SEND PROC FAR
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JMP DWORD PTR SN ;GO TO LOADED CODE ENTRY POINT
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SEND ENDP
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;
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CODESEG ENDS
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END
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