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FAQ: What is FUD Crypter? - Hide Trojans, Password Stealers and Keyloggers From Antiviruses


What is FUD Crypter and how to use it to Bypass antivirus detection for RATs and viruses

I have already written about Keyloggers in my previous articles, like Azure AIO Keylogger, Star Tools, Ref Stealer and many other keyloggers previously to hack e-mail account passwords. I have mentioned about antiviruses detecting keyloggers as hacking softwares (viruses) and hence, hacker has to use Crypters to avoid antivirus detection for keyloggers. Here i'll tell you something more about Crypters - hacking software for bypassing antivirus detections.

What is Crypter?

As said above, Crypter is free software used to hide our viruses, keyloggers or any RAT tool from antiviruses so that they are not detected and deleted by antiviruses. Thus, a crypter is a program that allow users to crypt the source code of their program. Generally, antivirus work by splitting source code of application and then search for certain string within source code. If antivirus detects any certain malicious strings, it either stops scan or deletes the file as virus from system.

What does Crypter do?

Crypter simply assigns hidden values to each individual code within source code. Thus, the source code becomes hidden. Hence, our sent crypted trojan and virus bypass antivirus detection and our purpose of hacking them is fulfilled without any AV hindrance. Not only does this crypter hide source code, it will unpack the encryption once the program is executed.

What is FUD?

FUD is acronym for Fully UnDetectable. With increased use of Crypters to bypass antiviruses, AV became more advanced and started including crypter definitions to even detect crypter strings within code. So, use of crypter to hide Ardamax keylogger and RATs became more complicated as nowadays, no publicly available crypter is FUD.

So, if you crypt RATs with publicly available crypters, they are bound to be detected by antiviruses. This is because most FUD crypters remain "FUD" for maximum of one or two days after their public release. To obtain FUD crypters, you have to either search for it in hacking forums or make one (which is somewhat tedius.. I am working on this).

Download FUD Crypter
for Free

1. Free Download Blackout Crypter with Stub Package to make virus undetectable and hack email passwords.

2. Run Blackout Crypter.exe application to see this:

3. Now, select AES or RC4 as your needs. I have selected AES over here. Hit on "Select a stub" and browse to Stub Package folder. Select AES or RC4 stub you want. Here, I have used "Stub 9" from AES folder. The difference between AES and RC4 Encryption System is that AES is the most secure and RC4 is fastest!

4. Hit on "Select a file" and select the server file you want to make undetectable from antiviruses. You can use Ref Keylogger, tDevil, Azure AIO Keylogger or Star Tools Keylogger to create a server.exe file. Now, hit on Crypt it and you will get "Crypted.exe" file created in current directory (in "Blackout Crypter" folder).

5. Features of Blackout Crypter:
  • 100% FUD - No AntiVirus will detect your file!
  • 100% FREE
  • AES and RC4 Encryption System
  • 256-Bit Password - Amazingly secure your file
  • Destroy Antivirus - When ran, all antiviruses will be KILLED and DELETED, and then your virus will be ran. All this is done SILENTLY.
  • Scantime and Runtime (After AntiVirus kill) FUD (AntiVirus will be destroyed before running your encrypted file)
  • Supports every damn .exe file on the net!
  • EOF Support - Works with Cybergate.
6. Virus Scan Result:

As the virus scan result shows, Kbw-Logger was 10/21 detectable to antiviruses. But, after crypting it with Blackout Crypter, this detection rate dropped to 1/21.

Virus Scan result before Crypting

Virus Scan result after Crypting

7. This crypter package contains 12 stubs. So, even if one stub becomes detectable, try out another one. I have personally tried this one and found useful to hack Hotmail password. If you have any problem in using this FUD Crypter to make server undetectable to antivirus, please mention it in comments.

Very Important:
Do not scan these tools on VirusTotal. Use and also check the "Do not distribute the sample" option.

So guys, this is all about crypter. Hope you found this post useful.

Also read:
Learn What is Binder and How to Use It for Hacking

Do you have questions, comments, or suggestions? Feel free to post a comment!

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35 comments to "FAQ: What is FUD Crypter? - Hide Trojans, Password Stealers and Keyloggers From Antiviruses"

loukas1997 said...
April 25, 2010 at 7:21 PM

so if you open it on a computer it delets its antivirus?

Aleksandar said...
April 26, 2010 at 12:11 AM

No it doesn't delete the antivirus. It hides keyloggers from antiviruses so that they are not detected and deleted by antiviruses.

Anonymous said...
May 5, 2010 at 11:44 AM

hi Aleksandar - i can't seem to find the crypted file, even in the current directory, would u know where it saves it to?

Aleksandar said...
May 5, 2010 at 11:54 AM

It saves there. After crypting it check the folder where the Crypter is placed, it has to be there.

john said...
May 9, 2010 at 12:14 PM

why u said not to scan on Virus Total!!

Aleksandar said...
May 9, 2010 at 12:25 PM


This is necessary because Virus Total and almost all other online scanners have tendency to redistribute virus detected sample to all other online scanners and hence, almost all antiviruses detect our crypted server as virus. Thus, our server no longer remains FUD. So, always scan FUD hacking softwares at as I have mentioned above.

Anonymous said...
May 15, 2010 at 1:16 PM

Ugh.. my first post here.
Great work with this site, Mister Aleksandar.

But, I have a question.. Well I wanted to crypt subs3v3n. I played around with those things and tried it many ways. - It still keeps detecting the "trojan"... (Windows Defender, WinVista)

Is there a way to prevent this?
(Maybe a never "trick"?)..

Aleksandar said...
May 15, 2010 at 3:15 PM

This is because most FUD crypters remain "FUD" for maximum of one or two days after their public release. To obtain FUD crypters, you have to either search for it in hacking forums, to buy it or make one.

Anonymous said...
May 15, 2010 at 3:34 PM

Okay man, thanks for the answer...

So there is no "normal" way, to get something FUD'd so that WinDefender doensnt recognize it anymore...
Too bad...

Aleksandar said...
May 15, 2010 at 3:35 PM

You can try VB Undetecting Tool

Hope it'll help you

Anonymous said...
May 21, 2010 at 7:52 AM

Crypters really have a demand for people wanting to FUD there files.. the main issue is that crypters undetection only lasts a limited amount of time, and this is usually because crypters are spread very fast with others that will upload to scanner sites like virustotal thus causing detection.

If you want a reliable crypter that will last FUD for a very long time, I strongly recommend you guys to either code your own crypter or simply modify other crypter sources

heres a great selection of crypter sources i found: Crypters and crypter sources

Anonymous said...
May 21, 2010 at 2:32 PM

hi,is it possible to just upload a binded + crypted server to a torrent site or rapid share


Aleksandar said...
May 21, 2010 at 2:42 PM

Yes you can upload it to a torrent or file sharing site.

rick said...
May 21, 2010 at 3:36 PM

hi witch should i do first bind the server or crypt. also how do i know if i have done everything righti used the emial notify because i made a server at 110 mb but when i try to test it says that the password was not permited or something like that

thanks and great site man the pranks thing is so funny i did a few of them so funny

blake said...
May 30, 2010 at 3:13 AM

Download Blackout Crypter with Stub Package this link you telll us to donwload from i go to click on the download link in the new tab window and it never pops up for me to save onto my computer

Anonymous said...
June 1, 2010 at 12:17 PM

Your this blog is really awesome its one of my favorite but im new to this hacking so i wanted to know how can we download fullversion softwares from internate without any payment.....

Aleksandar said...
June 1, 2010 at 5:38 PM

Here you can find free premium accounts for 13 download sites

Aleksandar said...
June 1, 2010 at 6:11 PM

@ blake

Maybe mediafire had some kind of error, check now, it should work.

Ace said...
June 6, 2010 at 1:40 PM

Hey Aleksandar, can you code a crypter for me??
i am ready to pay for it.....all i want it to be is copy should be unique....

Anonymous said...
June 9, 2010 at 5:41 AM

this thing to make it work when you want to send to victim mail yes?because i try to send it but it say can not because it virus file so after i dun everything about creat trojan and bind it change i con so after that i have o come and down load this yes?so let say this is last step?
cause i really try somany time but could not sent it today i just find out this...
please explain ..Thank

Aleksandar said...
June 9, 2010 at 5:20 PM

You can add it to a winrar archive and send it via email, msn. etc.

Anonymous said...
June 15, 2010 at 1:20 PM

i have bind it with ref stealer but i still can not sent to victim it still block my file when i attach in e-mail why it not bypass virus for me??
Pls, help!!Thk

Anonymous said...
June 15, 2010 at 2:41 PM

before use this program i have to make bind exe.file first ?or i can go for this direcly?
and how it will show to vitim it will show icon of?Thank a lot

email security service said...
June 18, 2010 at 3:50 PM

Thanks for sharing, I will bookmark and be back again

Anonymous said...
June 19, 2010 at 3:14 PM

Man I designed my own keylogger in vb thinking that it would become undetectable to antivirus.... But those fuckers out there are really smart..... If any ones got an idea about which vb code causes "heurTrojan.Win32.Generic" detection..... or what should I do....

Thanks in advance.....

xeros said...
June 22, 2010 at 4:46 AM

Nice blog you have here sir! I am also into this topic.

Anonymous said...
July 13, 2010 at 3:23 PM

hello this is my first are doing great buddy....i just wanted to know is there any way to bind or crypt scraps of orkut with server.exe...if yes then please inform!!!!!!

Anonymous said...
July 26, 2010 at 6:58 AM

Hey can anyone link me a source code for a FUD crypter? im going to make my own ^_^ said...
November 5, 2010 at 6:15 AM

This comment has been removed by the author.
Anonymous said...
November 5, 2010 at 8:05 AM

I was looking for something like this... Great explanation and nice software. I understand FUD'ing better now that I have come here. I know that this program might not be very usable by now for FUD'ing, but I will be able to use it for practice.

Anonymous said...
January 6, 2011 at 11:05 AM

great work aleksender sir.... u r my mentor... thanks

Anonymous said...
January 13, 2011 at 10:24 AM


is this still working??thank you

Anonymous said...
February 2, 2011 at 9:02 AM

So if I create my own new crypter and use it only for a single one time hacking mission, will it be 100% successful? (ex: hacking Pentagon Above Top Secret files)

Anonymous said...
February 13, 2011 at 2:09 AM

i know this is an older post but i have been searching for info on how to write a crpyter (or modify an already existing one). as a non-programmer i dont know where to start. can anyone share some basic info? should i be looking into a specific programming language?

Anonymous said...
April 16, 2011 at 10:19 PM

Hey....nice tutorial
but plz tell me if someone use this trick to get my password how can i protect my PC from it........

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