What is a crypter? A crypter is a program used to make viruses undetectable by anti-viruses.
Crypter types:
Runtime: Crypters that crypt your virus and when you run it in a computer it is undetectable by the anti-virus.
Scantime: Crypters that crypt your virus and when you scan it it is undetectable but when your run it in a computer the anti-virus detects it.
Crypter parts:
[list][*]Client: The porgram where you can load your file and crypt it. [/*:m] [*]Stub: Stub is a filter for the file you chose at the client. If you delete it the client is useless but some crypters don't have a stub (internal stub).[/*:m][/list:u]
FUD & UD
UD means UnDetectable. FUD means Fully UnDetectable. You can check if your crypted virus is FUD or UD at NoVirusThanks.