Today I'll be talking about crypters - to bypass antivirus
Crypters
Crypting is one of the popular methods used for antivirus evading due to it’s simplicity and also because it does not require any prior knowledge about any programming language.
How Crypters Work?
A crypter is a small program that allows the attacker to crypt the source code of a Trojan or any form of malware, A crypter basically jumbles the source of the file to make it undetectable, As I told you before that an antivirus use a signature based detection, the crypter jumbles the source so when an antivirus scans the virus/malware/trojan it cannot be detected.
FUD
FUD stands for “Fully Undetectable” which simply means that a trojan or a virus which cannot be detected by an antivirus. FUD server is very difficult to achieve, you are very lucky if you can find any binders or crypters out there which is FUD. Free Crypters lose their affectivity as antivirus makes or composes a signature for them, however paid crypters are said to be Fully undetectable.
Ultimate Crypter – Ultimate crypter is one of the most commonly used crypters around, Ultimate crypter may not be able to achieve a FUD server but it has a very low detection rate. It has a paid version too which claims to make the server FUD however I haven’t tried it
Yoda’s Crypter – Yoda’s crypter has a lower antivirus detection rate than ultimate crypter, it has a user friendly graphical representation and is very easy to use.
Crypters are not always used for hacking purposes.
A Crypter encrypts and packs other software in a way that makes the actual bytes unreadable. People use a crypter to protect software from reverse engineering, piracy / theft, hacking / tampering. Antivirus positives can be defeated this way as well, though unfortunately this technique of using crypters is also used by hackers to make a virus and other malware undetected by antivirus software.