What Is FUD Crypter?
FUD is acronym for fully undetectable.It is a software that can be used to encrypt your exe files.
What is the use of FUD Crypter?
FUD
crypters can be used to encrypt viruses,RAT,keyloggers,spywares etc to
make them undetectable from antiviruses.You can also read my post
on spywares,viruses and worms.When these exe files are encrypted with Fud crypters they become undetectable with antiviruses
How Does FUD Crypter Work?
The Basic Working Of FUD Crypter is explained below
The
Crypter takes the original binary file of you exe and applies many
encryption on it and stores on the end of file(EOF).So a new crypted
executable file is created.
Original Exe Crypted Exe
001————- 010 101————-110
100|Original File|000-> Cryptor ->010|Original File|110
010————- 111 110————-010
Original Exe Crypted Exe
001————- 010 101————-110
100|Original File|000-> Cryptor ->010|Original File|110
010————- 111 110————-010
The
new exe is not detected by antiviruses because its code is scrambled by
the crypter.When executed the new .exe file decrypts the binary file
into small the data small pieces at a time and injects them into another
already existing process or a new empty one, OR it drops the code into
multiple chunks in alternative data streams(not scanned by most a/v)
then executes it as a .txt or .mp3 file.
Why Most FUD Crypters Donot Work?
As
a FUD crypter becomes popular it also get the eyes of antivirus
companies.The antivirus companies update their software and employ
detection mechanism that detect the encryption’s by the crypter.So, most
of the popular FUD crypter are easily detected by antiviruses.
Note:-Donot
test your crypter on virustotal.com as it distributes the samples and
your crypter will not remain FUD if you scan with virustotal.
Where can I Download a Free FUD crypter?
As
I already mentioned that as the crypter becomes popular it doesnot
remain FUD.So the only FUD crypter available are those made by indivuals
and they can be found by spending a little time on google by
searching.It will not make profit to anybody if I share my FUD crypter
here as it will not remain FUD for long as some noobs will surely scan
it with virustoal.So,its better you search your own and keep it to
yourself.
Note: .netframework should be installed in your system before running the crypter.
hope you like the post.:)
hope you like the post.:)