What is STUB?
Good to know STUB most important part of a crypter. STUB is part of codes that used to encrypt and decrypt malicious code. Encrypted data with STUB will stand fully undetectable (FUD) for a longer time.
An important part of a crypter is STUB, a code is used to encrypt and decrypt malicious principles. The stub simulates the features of existing rules or use static unique custom to bypass specific detection anti-viruses process.
What is Polymorphic crypter?
Static crypters start different stubs to get FUD and programmers of this crypter needs daily care and checks to keep up FUD results.
Polymorphic crypter use ambiguous algorithms for encryption and decryption process with casual keys, variables.
Polymorphic methods by modifying its shape can every time runs, but the code function (its semantics) will not change at all. The encryption or decryption pair are mutating with each copy of the principles
The files made by this algorithms may mutate itself every time it copies itself to a pristine place. This software can full silently and make security programs or anti-viruses (AV) cannot find it easily.
Security research lab specialists facing mayor challenges for detecting of using signatures posed by modern techniques capable of developing polymorphic families. They experienced a fundamental problem when facing viruses instances detection when apply obfuscation techniques to hide bots methods.
Attributed is increasing finding complexity is the executable in the endpoint usual that semantic-based detection techniques may needed.
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