I build a program but my antivirus software defined that as (infected by virus: gen:variant.bulz.560818). Now what to do and why this happen?

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C++

#include <stdio.h>
#include <ctype.h>
int main()
{
    int i,j;
    char a[20];
    fgets(a,50,stdin);
    int len=0;
    for(i=0;a[i]!='\0';i++){
        len++;
    }
    int k,g;
    for(k=0;k<len;k++){
      if(islower(a[k])){
        a[k]=toupper(a[k]);
      }
    }
    printf("%s\n",a);
    int v=0,c=0;
    for(g=0;g<len;g++){
      if(a[g]=='A'||a[g]=='E'||a[g]=='I'||a[g]=='O'||a[g]=='U'){
         v++;
      }else{
         c++;
    }
    printf("vowel-%d="" and="" consonants-%d",v,c);
    return 0;
}

What I have tried:

What I have tried:

My antivirus software defined that as (infected by Virus: Gen:Variant.Bulz.560818). I can't run this program.

Posted 6-May-22 4:34am

Fardin Khan_451

Updated 6-May-22 7:09am

Rick York

v3

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Richard MacCutchan · Accepted Answer · 2022-05-06T04:56:00

Solution 1

Try adding some extra lines of code just to change the shape/size of the executable. Something like:

C++

// add this before main
void foobar()
{
    int nothing = 0;
    char* nobody = "John Doe";
}

Posted 6-May-22 4:56am

Richard MacCutchan

Comments

CPallini 6-May-22 11:31am

Discarded by the optimizer. :-D

Richard MacCutchan 6-May-22 11:37am

I didn't say it was any use.

CPallini 6-May-22 11:46am

If it is discarded, then, how can it change the shape or the size of the executable?

Richard MacCutchan 6-May-22 11:53am

I have just tested it and the addition of that code changes the executable size.

CPallini 6-May-22 12:10pm

Well, I just tested as well.
You are right, my bad. I'm used to GCC compiler for ARM MCUs, I suppose it is more aggressive on code size optimization.

Richard MacCutchan 6-May-22 12:23pm

I used MSVC and gcc and got similar results with both. It seems that the default for both compilers is no optimisation; who knew?

honey the codewitch 6-May-22 13:33pm

When you're compiling for little devices -Os is in effect on GCC.

OriginalGriff · Accepted Answer · 2022-05-06T05:34:00

Solution 2

Change your build options to alter optimizations - that may be enough to prevent a false positive. If so, contact the AV supplier and ask them to try and prevent that happening.

But ... I'd suggest that you start by checking your whole system with a different AV scanner first ...

Posted 6-May-22 5:34am

OriginalGriff

Rick York · Accepted Answer · 2022-05-06T07:09:00

The solutions tell how to deal with this. One thing I noticed were these lines :

C++

char a[20];
fgets(a,50,stdin);

You are telling fgets to accept more data than the array a can hold and that can result in unexpected behavior from your program.

A better way to deal with this is to define a value for the size of the buffer and use that with fgets. Here is how you can do that.

C++

#define BUFFER_SIZE 49
char a[ BUFFER_SIZE + 1 ];   // +1 to accommodate trailing null
fgets( a, BUFFER_SIZE, stdin );

Now your code will not accept more data than the array can contain.