mirror of
https://github.com/vxunderground/MalwareSourceCode
synced 2024-06-28 09:52:32 +00:00
541 lines
8.5 KiB
NASM
541 lines
8.5 KiB
NASM
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memS equ 1 ;model small convertable to COM model
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;**************** RUNTIME LIBRARY OF KILLDIANA.COM **************
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include lcmac.mac
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calln macro name
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call near ptr name
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endm
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callp macro name
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lea dx,name
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calln print
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endm
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callz macro name
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push si
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lea si,name
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calln printz
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pop si
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endm
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dgroup group data,udata,xstack
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assume ds:data
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pgroup group prog,tail
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prog segment byte public 'prog'
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assume cs:prog
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org 100h ;FOR MODEL COM
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start label far
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cli
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mov ax,offset pgroup:xtail ;get end of code group
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add ax,16 ;calculate segment address of ds
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mov cl,4 ;calculate segment address of ds
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shr ax,cl ;calculate segment address of ds
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mov bx,cs ;calculate segment address of ds
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add ax,bx ;calculate segment address of ds
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mov ds,ax ;set ds to dgroup
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mov es,ax ;set es to dgroup
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mov ss,ax ;set ss to dgroup
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mov ds:_ss,ax ;save stack segment for (do,for,while)
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mov sp,offset dgroup:sbase + 512 ;range of stack = 512 bytes
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mov ds:_top,sp ;save stack pointer for (do,for,while)
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mov bx,offset dgroup:sbase ;get stack segment for (do,for,while)
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mov ds:_base,bx ;save stack segment for (do,for,while)
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sti
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mov ah,30h ;get dos version number
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int 21h
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mov ds:_dos,ax ;save dos version for (do,for,while)
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callp copyr
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callp tryrem
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calln remove
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callp weak
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lea di,fname
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mov si,82h
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getf:
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mov al,cs:[si]
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cmp al,0dh
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je tonul
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cmp al,' '
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jc blank
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mov [di],al
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inc di
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blank: inc si
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.br getf
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tonul: clr al
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mov [di],al
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calln prefix
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calln comwrk
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; calln exewrk
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mov ah,4ch
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int 21h ;exit to DOS
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print proc near
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mov ah,9
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int 21h
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ret
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print endp
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comwrk proc near
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calln first
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jc toret
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calln workcom
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ffnext:
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calln fnext
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jc toret
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calln workcom
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.br ffnext
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toret:
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ret
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comwrk endp
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fnext proc near
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mov ah,4fh ;findnext
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int 21h
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jc ercc
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jnc foundf
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fnext endp
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first proc near
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lea dx,fname
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mov cx,27h ;search all types of files
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mov ah,4eh ;findfirst
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int 21h
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jnc foundf
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callp notfnd
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ercc: stc
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ret
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foundf:
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calln konka
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clc
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ret
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first endp
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konka proc near
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mov ah,2fh
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int 21h ;get dta in es:bx
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add bx,26
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mov ax,es:[bx]
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mov llfil,ax ;save lowlengh
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inc bx
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inc bx
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mov ax,es:[bx]
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mov lhfil,ax ;save highlengh
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inc bx
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inc bx ;pointed to fname
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lea si,ffname
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lea di,fname
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push es
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push ds
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pop es
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mov cx,40h
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repe cmpsb
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pop es
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dec si
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copyf: mov al,es:[bx]
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mov [si],al
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inc si
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inc bx
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or al,al
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jne copyf
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ret
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konka endp
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prefix proc near
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lea si,fname
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add si,40h
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mov cx,40h
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std
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lodi:
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lodsb
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cmp al,'\'
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je founds
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cmp al,':'
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je founds
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loop lodi
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mov nepar,offset fname
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.br endcp
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founds:
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inc si
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inc si
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mov nepar,si
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lea si,fname
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lea di,ffname
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cpag:
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cmp si,nepar
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jae endcp
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mov al,[si]
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mov [di],al
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inc si
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inc di
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.br cpag
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endcp:
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cld
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ret
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prefix endp
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remove proc near
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push ds
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clr ax
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mov ds,ax
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les bx,ds:[84h] ;21h vector
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mov ax,cs
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mov dx,es
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cmp dx,ax
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jc nodia
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cmp bx,2eeh
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jne nodia
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mov ax,es:[74fh]
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mov ds:[84h],ax ;restore 21h
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mov ax,es:[751h]
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mov ds:[86h],ax
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mov ax,es:[74bh]
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mov ds:[9ch],ax ;restore 27h
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mov ax,es:[74dh]
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mov ds:[9eh],ax
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mov ax,es
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mov bx,ax
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dec ax
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mov es,ax
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mov es:byte ptr[0],5ah
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mov es:word ptr[1],0
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pop ds
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callp diakt
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ret
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nodia:
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pop ds
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callp dinakt
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ret
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remove endp
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workcom proc near
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lea dx,ffname
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mov ax,4300h ;get attrib
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int 21h
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jnc kopa
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jmp retga
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kopa:
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mov al,cl
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and al,0feh
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cmp al,cl
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je nochatr
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mov attr,cx
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mov ax,4301h ;set attrib
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clr cx ;to normal
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int 21h
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.br nochh
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nochatr:
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mov attr,0
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nochh:
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mov ax,3d02h ;open file R/W
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int 21h
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jnc kop1
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jmp resatr
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kop1: mov bx,ax
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calln gettm
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mov cx,18h
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lea dx,bufer
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mov ah,3fh ;read first 3 bytes
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int 21h
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jc closs2
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mov di,dx
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mov ax,ds:[di]
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cmp ax,5a4dh
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jne commfil
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push bx
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calln exework
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pop bx
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jc chek2
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jmp closs
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commfil:
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mov al,ds:[di]
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cmp al,0e9h
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je mak111
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jmp closs
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mak111: mov si,ds:[di+1] ;relative offset
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add si,3
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mov di,si
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sub si,68h
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mov len,si
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clr cx
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mov dx,di
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mov ax,4200h
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int 21h ;seek to found e80000
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closs2: jc clos21
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lea dx,bufer
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add dx,18h+3
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mov cx,7 ;read 7 bytes
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mov ah,3fh
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int 21h ;read
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clos21: jnc chek1
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chek2: jmp closs
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chek1:
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mov di,dx
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cmp ds:byte ptr[di],0e8h
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jne chek2
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cmp ds:word ptr[di+1],0
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jne chek2
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cmp ds:word ptr[di+4],0ee81h
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jne chek2
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cmp ds:word ptr[di+6],6bh
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jne chek2
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clr cx
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mov dx,si
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add dx,705h
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mov ax,4200h
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int 21h ;seek to found org 3bytes
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jc closs
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lea dx,bufer
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add dx,18h
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mov cx,3 ;read 3 bytes
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mov ah,3fh
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int 21h ;read
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jc closs
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lea si,bufer
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restor3:
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mov al,[si+18h]
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mov [si],al
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inc si
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loop restor3
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clr cx
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clr dx
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mov ax,4200h ;seek to begin
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int 21h
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jc closs
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mov cx,18h
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lea dx,bufer
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mov ah,40h ;write
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int 21h
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jc closs
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clr cx
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mov dx,len
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mov ax,4200h ;seek to end of real data
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int 21h
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jc resatr
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exelen:
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clr cx
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mov ah,40h ;truncate file
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int 21h
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push bx
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callp file
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callz ffname
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callp isok
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pop bx
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closs:
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calln settm
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mov ah,3eh
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int 21h ;close file
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resatr:
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mov cx,attr ;to old attributes
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or cx,cx
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je retga
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lea dx,ffname
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mov ax,4301h ;set attrib
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int 21h
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retga:
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ret
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workcom endp
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printz proc near
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eter: mov ah,2
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lodsb
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or al,al
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je caret
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mov dl,al
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int 21h
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.br eter
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caret:
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ret
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printz endp
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gettm proc near
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mov ax,5700h
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int 21h
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jc qget
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mov atcx,cx
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mov atdx,dx
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qget:
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ret
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gettm endp
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settm proc near
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mov ax,5701h
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mov cx,atcx
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mov dx,atdx
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or cx,cx
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je qset
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or dx,dx
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je qset
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int 21h
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qset:
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ret
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settm endp
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exework proc near
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mov ax,[di+16h] ;get main lenght in pargarphs
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mov cx,16
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mul cx
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push bx
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mov bx,[di+8]
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mov cl,4
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shl bx,cl
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add ax,[di+14h] ;get IP
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adc dx,0
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add ax,bx
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adc dx,0
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pop bx
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mov exhlen,dx
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mov exllen,ax
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mov cx,dx
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mov dx,ax
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mov ax,4200h
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int 21h ;seek to begin Diana code
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lea dx,bufer
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add dx,18h+3
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mov cx,7 ;read 7 bytes
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mov ah,3fh
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int 21h ;read
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jc echek2
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mov di,dx
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cmp ds:byte ptr[di],0e8h
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jne echek2
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cmp ds:word ptr[di+1],0
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jne echek2
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cmp ds:word ptr[di+4],0ee81h
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jne echek2
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cmp ds:word ptr[di+6],6bh
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je exgoin
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echek2:
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stc
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ret
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exgoin:
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sub exllen,68h
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sbb exhlen,0 ;contains lenght of file
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mov dx,exllen
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mov cx,exhlen
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add dx,707h
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adc cx,0
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mov ax,4200h
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int 21h ;seek to old vectors
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lea dx,bufer
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add dx,26h
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mov cx,1
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mov ah,3fh
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int 21h ;read old cs:ip, ss:sp
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jc echek2
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mov dx,exllen
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mov cx,exhlen
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add dx,6fdh
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adc cx,0
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mov ax,4200h
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int 21h ;seek to old vectors
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lea dx,bufer
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add dx,18h
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mov cx,8
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mov ah,3fh
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int 21h ;read old cs:ip, ss:sp
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jc echek2
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mov ax,llfil
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mov dx,lhfil
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sub ax,exllen
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sbb dx,exhlen
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mov lhfil,dx
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mov llfil,ax
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lea di,bufer
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mov ax,[di+4]
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mov cx,512
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mul cx
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add ax,[di+2]
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adc dx,0
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sub ax,llfil
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sbb dx,lhfil
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div cx
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mov cx,dx
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mov dl,[di+26h]
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sub cx,dx
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mov rema,cx
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mov [di+2],dx ;store remainder of lenght
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mov [di+4],ax ;store /512 lenght
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mov ax,[di+18h] ;get ip
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mov [di+14h],ax ;store
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mov ax,[di+1ah] ;get cs:
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mov [di+16h],ax ;store
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mov ax,[di+1ch] ;get sp
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mov [di+10h],ax ;store
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mov ax,[di+1eh] ;get ss:
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mov [di+0eh],ax ;store
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clr cx
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clr dx
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mov ax,4200h
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int 21h ;seek to prefix
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mov cx,18h ;to write new prefix
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lea dx,bufer
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mov ah,40h
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int 21h ;write 18h bytes prefix
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mov cx,exhlen
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mov dx,exllen
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sub dx,rema
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sbb cx,0
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mov ax,4200h
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int 21h ;seek end of file
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jmp exelen
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exework endp
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prog ends
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tail segment word 'prog' ;help segment to allocate end of code
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xtail dw -1 ;and set the data segment
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tail ends
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data segment para public 'data' ;data segment
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fname db 40h dup(0)
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ffname db 40h dup(0)
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bufer db 27h dup(0)
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_ss dw ? ;Lattice variables
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_base dw ? ;Lattice variables
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_dos dw ? ;Lattice variables
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_top dw ? ;Lattice variables
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nepar dw 0
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fhand dw 0
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exhlen dw 0
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exllen dw 0
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||
llfil dw 0
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||
lhfil dw 0
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len dw 0
|
||
attr dw 0
|
||
atcx dw 0
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atdx dw 0
|
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rema dw 0
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||
notfnd db 'File not found',13,10,'$'
|
||
copyr db 'Dianakiller program V1.0 (C)Copyright Deny_Soft 1989',13,10,'$'
|
||
tryrem db 'Searching Diana in memory...',13,10,'$'
|
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diakt db 'Diana found',7,' and removed extra',13,10,'$'
|
||
dinakt db "Diana isn't active",13,10,"$"
|
||
weak db 'Searching for weak files...',13,10,'$'
|
||
file db 'File $'
|
||
isok db 9,9,' ... restored',13,10,'$'
|
||
|
||
data ends
|
||
.pub <_ss,_base,_dos,_top> ;make external
|
||
udata segment public 'data'
|
||
udata ends
|
||
xstack segment 'data'
|
||
sbase dw 512 dup (?)
|
||
xstack ends
|
||
end start
|
||
|