What
are Crypters?
The word “Crypter” comes
from the term “encryption”. The main function of a Crypter is to crypt data, to
be more specific, computer programs. A Crypter takes some data and encrypts it
such that it is incomprehensive to the normal eye, and gives the capacity to be
decrypted, and again put back to sensible terms. This can be done through a
cipher. A cipher is used to decrypt and encrypt various messages. Presently,
all these are done on computers and it is very essential to keep the computers
secure.
The ciphers that are
used nowadays are more complicated and these ciphers are called algorithms.
Algorithms are some kind of mathematical formulas which are used to encrypt and
decrypt the data. Mostly numbers are used in algorithms, because there are infinite
numbers, but only 26 alphabets. What the Crypters do is that they not only
encrypt random data, but they even encrypt programs, hiding the program’s
identity. This is mostly done with the intension to pass off viruses as clean
software. Even the most powerful anti-virus cannot detect the virus. There are
other types of Crypters with different functions, but this is their most
familiar use.
How
to test whether yourCrypter is undetectable?
You can test whether
your Crypter is undetectable or not. The easiest method is to scan it on
anti-virus scanners. You can check whether it is truly FUD, or if it is not
detected on your anti-virus. In this way, there is no risk that data will be
sent from the anti-virus on your personal computer to the company that owns the
anti-virus. Just visit the sites virustotal.org
or scanner.novirusthanks.org. Actually, these are free multi anti-virus
scanners. Make sure that you check “Do Not Distribute” option or anything
similar to it. In this way it will not allow thewebsite to distribute the scan
results to anti-virus companies. But in the long run, you must accept the fact
that all Crypters become detected.
How
can you make your Crypter FUD?
If your Crypter is FUD,
then it has the ability to encrypt your exe files.There are many methods at
make a FUD Crypter.The firstway is
to change assembly information. You need to alter the EXE’s compilation
settings. You can modify the description, file version, etc. Also you can
change the method names and variable names, for an anti-virus has the ability
to detect them. Secondly, do not add junk code which can make an anti-virus
confused. Thirdly, you must understand the signatures of the anti-viruses.
Anti-viruses check specific signatures which are left behind by the malicious
programs. Click here to know
more about FUD Crypter.
