What is FUD Crypter? Crypter is a kind of malware software or encrypts any data safely to hide the main file from any security software. Crypter binds any infected files with an official EXE format. It then the output of this encrypts is unrecognizable to antiviruses. What is Runtime in the crypter?
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What is a Crypter? Okay before we get into the good stuff, lets first clear up all your questions you have been having by really getting into all the fundamentals of Crypters. Oh and if you have any questions of anything throughout this tutorial, always refer and search on Hackforums for answers. A Crypter Encrypts your files, while a Packer packs your files usually with the intention of making it smaller in size and sometimes for it to be undetectable on virus scans.
Both can look exactly the same so you better watch out.. How do i know which antiviruses detect my file? There are many sites with this same purpose of scanning files and giving a report of which antiviruses detect your files.
The main issue leading to Crypters becoming detected is because if you or someone who is in posession of your crypted file, scans it on some of these scanner sites, the crypted file will be distributed to the antivirus vendors, thus causing the crypted code overwritten on your file to become detected, which in turn causes your Crypter to turn out detected. Some files like Bifrost, Medusa, and Cybergate require the end of file data in order to run without corruption. What is a USG?
A USG is part of a crypter that generates a unique version of the stub stub is part of a crypter used to encrypt and decrypt the specified file. You will understand this better later on in the tutorial. What is a File Binder? A File Binder is pretty self explanatory. You would usually use a file binder when being even more stealth then just simply a crypted file.
The biggest question people have when first learning what a binder is and what it does is, can you bind a. The answer is Yes, BUT.. For example anti-vm, anti-debugger, anti-avira…etc. These refer to bypassing or preventing something specified, so anti-debugger meaning it will prevent it from being debugged.
What is a File Pumper? The benefit of this is usually not so great but it can be okay to have and may lose a detection or 2. Types and Forms of Crypters Crypters can range in many types and forms and it is important to understand these types and forms because it will help you choose a quality crypter to solve your needs or help you realize what options and features you would want to implement in your own Crypter.
I kept on searching and reading a diverse range of forums. Overtime, once I learned enough about them i realized the actual undetection vs antivirus concept. This is the eye opener point which you will all eventually end up and at this point you will then realize why. Antiviruses can be alot more complex then you would imagine, so learning the ways they are notified of malicious files and how they detect are essential for bypassing them.
Okay there are 2 ways antiviruses are notified of malicious files and eventually flag your file as detected. The First One is: From online file scanner sites where people upload files they think might be suspicious looking, and want to know if its actually a virus or not. They upload their files to one of these sites to check which antiviruses detect it and flag it as a virus.
Once the files are uploaded, based on certain elements they are then distributed to the antivirus vendors labs. On some online scanners there is an option available for you to check for no distribution. I am not aware if this actually does what we all think because i heard they will still distribute, but with a price to the av vendors.
Even though this may be true or false, it is still always a good idea to scan on these sites that have this option available. The Second One is: From the antiviruses themselves. You may be thinking, oh really? This is essential information that everyone must know when using or making Crypters. Most of the time, the antivirus will automatically send the files out when any certain file becomes detected.
Antivirus owners also have the option to send off a file to the vendor with a click of a button through their desktop antivirus. What can you do about this? You can change the settings on your antivirus!
The setting usually come in slightly different forms, sometimes you are also asked during setup, and sometimes you just have to go into the settings or options manually to change them.
All of what you just read is essential to keep in mind when making an FUD Crypter. The sole reason behind why public Crypters always become detected, and usually fast is because the majority of people do not know the antivirus vs Crypter concept.
Therefore they either blindly upload there crypted files to one of the scanner sites that distribute, Also, the antiviruses themselves are uploading there crypted files without them even noticing. Even people who make there own Crypters arent aware of this, which is why they are always wondering why there crypted files always become detected so fast. What do AntiViruses look for in a file?
First off, you will need some basic understanding of how anti-viruses actually work. Exe files are simply lines of instruction, and each line is called an offset. They use that database to check against your file to see if it matches. If it does, then it is marked as infected. They do use other methods of detection, but this is the one you will learn how to avoid.
What will the program need to do? Your stub file will then extract the encrypted data from itself, decrypt it, then extract and run it. So just imagine if this stub file that is joined together with the crypted infected file is detected? Well, then all the files you crypt will also show up as detected since this stub is used with all the crypted files. Programming and Vb6 Fundamentals Okay now..
If you can code and you think you wont benefit from it, you can either just scim through it or just read it all and refresh your memory. First we must download Visual Basic 6 of course. Without getting so in depth and complicated, I am going to first have you learn the basic concepts of programming in order for you to just understand enough to be able to first understand the most essential parts of what a program is doing so you will be able to understand other sources when you read them and modify them.
This way always seems to be best because it seems like people learn alot easier over video tutorials rather than text tutorials. If you have a more specific question search google. Okay so, from searching for a long time.
Please try and go up until lesson 18 and ignore all the ads on the sides and in between. So programming a Crypter comes in these 2 parts and are made seperately in 2 different projects. They only interact with each other when compiled into finished. You might be wondering, well what project gets detected so I will know which to modify?
The Stub project is only what you have to always undetect and, re-undetect. So common sense being, when eventually, for example someone that you infected runs the crypted file and maybe uploads it to virustotal which distributes or the antivirus itself distributes, the crypted file has your stub code in it aswell as the crypted malicious code.
Therefore the antivirus will then detect and put signatures causing the stub code to become detected. Basically this stub code is injected into all crypted files so obviously all the crypted files will then also become detected since it caries these detected signatures. Now this is only one factor to keep in mind but it is definitely something you should know.
Changing Assembly information First we are going to change the compilation settings for the. Just make this a habit. Open the Stub Project and Right click in the project space on the top right and click project Properties. Once your there, you should see few options like project name, startup object, if you want to change any of that then do it. All these options should be changed to anything random.
The Antivirus Signatures concept Whats going to be explained here, you should always keep in mind when undetecting. Read every bit of this section, some things you may know already but there are definitely things you do not know which are very important. To my experience there are 2 types of signatures, which i like to call: Specific Signatures Broad Signatures Throughout making FUD Crypters you will come to realize that overtime all Crypters, private or public, will eventually become detected.
Now the reason for this is because not only do the people you spread the crypted files to have antiviruses that automatically distribute, etc. But also, antiviruses in cases where they get alot of similar files distributed, try to create signatures for the most unique parts of the code that all these malicious files have in common.
This is a broad type of signature. Unlike specific signatures that just detect a certain string of text in a certain part of the code, this broad signature will then cause all the Crypters using this api related to this situation to become DETECTED. This is the very disadvantage of programming in the most popular languages where Crypters are most popular to program with. So now if you think about it, a stub can also only go so far in being unique because antiviruses are always updating and populated their databases with not only specific signatures but, these broad signatures which eventually overtime will cause your Crypter to become detected.
No matter how unique your stub is, a part of this code in relation to broad signatures will become detected. Even if you do nothing with it. Now it may be more unlikely depending on how unique, but the point is that.
Even if your doing nothing with your stub and never crypt files, eventually it will become detected, all will. So to clarify, the fact that from all the other Crypters being distributed that for example that use a specific method of execution using a specific api which has slight relation to how your Crypter was made, will cause your crypter to also become detected.
Now with all this in mind, i want to make sure your not getting the impression that all vb6 Crypters suck and they will all get detected easily, because this is not completely true. As long as you use the right techniques and have your own unique and creative way of doing things, the longer the Crypter will last.
And just to let you know, when a crypted file is distributed, its not like it will become detected right away. It takes about a week to a few weeks for a signature to made on the file and updated into the database. What this tutorial will give you, is a layout of the universal, proven techniques that you can keep in mind so you can learn how they work, improve upon them, and make variations of them to successfully make your own FUD Crypters.
Finding and pinpointing Whats causing detection To accomplish the process of finding and pinpointing detection it is required that you understand the different parts of code and know what most of it does because you will be literally taking apart the code when finding the cause of detection.
I find that alot of people try undetecting there sources blindly by just throwing a whole series of undetection methods at the code. This will save you tons of heart ache and make the whole undetection process a whole lot easier. Finding whats causing detection can be very easy or somewhat difficult depending on if its a broad signature or a specific signature.
Creating a 100% FUD crypter
Enable Custom Manifest Extras Use this option with caution! Copy all resources from Custom Binary. Signing Sign the crypted file with cloned or spoofed digital certificate. Enable Spoof from Hostname : Help Not sure what to do? Read below on how to use crypter. How To Use: using crypter. X: Select a file to crypt in the main tab.
What is a Crypter? Okay before we get into the good stuff, lets first clear up all your questions you have been having by really getting into all the fundamentals of Crypters. Oh and if you have any questions of anything throughout this tutorial, always refer and search on Hackforums for answers. A Crypter Encrypts your files, while a Packer packs your files usually with the intention of making it smaller in size and sometimes for it to be undetectable on virus scans. Both can look exactly the same so you better watch out.. How do i know which antiviruses detect my file?
- high-performance undetectable crypters for Windows programs -