mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-24 20:35:25 +00:00
239 lines
5.4 KiB
NASM
239 lines
5.4 KiB
NASM
; +----------------------------------------------------+ ;
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; | Sample DVM Shower for use with the Magic Assembler | ;
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; +----------------------------------------------------+ ;
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mov ah,09
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mov dx,offset(headtxt)
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int 21
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cmp byte [0081],0d
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jne @1
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mov dx,offset(syntax)
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jmp error
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@1 mov si,0082
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mov showit,00
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@4 lodsb
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cmp al,'/'
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jne @5
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mov byte [si-01],00
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lodsb
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cmp al,'i'
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jne @6
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mov showit,ff
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jmps @5
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@6 cmp al,'I'
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jne @5
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mov showit,ff
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@5 cmp al,0d
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jne @4
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mov byte [si-01],00
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mov ax,3d00
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mov dx,0082
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int 21
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jnc @7
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mov dx,offset(openerr)
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jmp error
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@7 mov handle,ax
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mov bx,ax
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mov ah,3f
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mov cx,0003
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mov dx,offset(header)
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int 21
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mov si,offset(header)
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mov di,offset(musthd)
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mov cx,0003
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@8 cmpsb
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jne @9
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loop @8
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jmps @10
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@9 mov dx,offset(notdvm)
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jmp error
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@10 mov ah,3f
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mov cx,0001
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mov dx,offset(fullqrt)
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int 21
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cmp fullqrt,'V'
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je @11
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cmp fullqrt,'Q'
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je @12
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mov infobyt,a0
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jmps @13
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@12 mov infobyt,20
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jmps @13
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@11 mov ah,3f
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mov dx,offset(version)
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int 21
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cmp version,31
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jna @14
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mov dx,offset(verr)
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jmp error
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@14 mov ah,3f
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mov dx,offset(infobyt)
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int 21
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@13 mov ah,3f
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mov cx,0002
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mov dx,offset(dtime)
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int 21
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test infobyt,08
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jz @15
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mov ah,3f
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mov dx,offset(l)
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int 21
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mov cx,l
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@16 push cx
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mov ah,3f
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mov cx,0001
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mov dx,offset(ch)
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int 21
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push bx
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mov ah,0e
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mov al,ch
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xor bh,bh
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cmp showit,ff
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je @17
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int 10
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@17 pop bx
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pop cx
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loop @16
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xor ah,ah
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cmp showit,ff
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jne @15
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int 16
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@15 mov ax,0013
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int 10
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push bx
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mov ax,1012
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mov bx,0000
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mov cx,0100
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mov dx,offset(palette)
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int 10
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pop bx
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mov ax,a000
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mov es,ax
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@28 test infobyt,20
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jz @32
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mov ah,3f
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mov dx,offset(palette)
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test infobyt,10
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jnz @33
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mov cx,0030
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jmps @34
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@33 mov cx,0300
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@34 int 21
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cmp ax,cx
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jne @27
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push bx
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push es
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mov ax,ds
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mov es,ax
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mov ax,1012
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xor bx,bx
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test infobyt,10
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jnz @35
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mov cx,0010
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jmps @36
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@35 mov cx,0100
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@36 int 10
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pop es
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pop bx
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@32 xor di,di
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test infobyt,80
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jz @18
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mov cx,00c8
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jmps @19
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@18 mov cx,0064
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@19 push cx
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test infobyt,40
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jz @20
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call showcpr
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jmps @21
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@20 call showucp
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@21 cmp ah,00
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ja @27
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test infobyt,80
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jnz @22
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add di,00a0
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@22 pop cx
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loop @19
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jmps @28
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@27 mov ah,3e
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mov bx,handle
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int 21
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xor ah,ah
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int 16
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mov ax,0003
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int 10
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mov ax,4c00
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int 21
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showcpr test infobyt,80
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jz @23
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mov cx,00a0
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jmps @24
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@23 mov cx,0050
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@24 mov ah,3f
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mov dx,offset(line)
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int 21
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cmp ax,cx
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je @26
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mov ah,ff
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ret
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@26 mov si,offset(line)
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@25 push cx
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lodsb
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push ax
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and al,f0
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mov cl,04
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shr al,cl
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es:
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mov [di],al
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pop ax
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and al,0f
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es:
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mov [di+01],al
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add di,0002
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pop cx
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loop @25
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xor ah,ah
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ret
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showucp test infobyt,80
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jz @31
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mov cx,0140
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jmps @29
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@31 mov cx,00a0
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@29 mov ah,3f
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mov dx,offset(line)
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int 21
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mov si,offset(line)
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cmp cx,ax
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je @30
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mov ah,ff
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ret
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@30 movsb
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loop @30
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xor ah,ah
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ret
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error mov ah,09
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int 21
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mov ax,4c00
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int 21
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headtxt db 'Show DVM - Written by Bert for Magic Software - Development Kit Version' 0a 0d '$'
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musthd db 'DVM'
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notdvm db 'Not a DVM' 0a 0d '$'
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openerr db 'Cannot open file' 0a 0d '$'
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palette dbe DVMPAL.BIN
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syntax db 'Syntax: SDA [Filename.DVM][/I]' 0a 0d '/I shows included text (if exist)' 0a 0d '$'
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verr db 'Cannot display this version' 0a 0d '$'
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-
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ch db ?
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dtime dw ?
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fullqrt db ?
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handle dw ?
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header ds 3
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infobyt db ?
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l dw ?
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line ds 140
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showit db ?
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version db ?
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