Unknowing users open the program, which will force the crypter to decrypt itself and then release the malicious code.They send these programs as part of an attachment in spear phishing emails and spammed messages.They use crypters to encrypt a malicious program then reassemble the code into an actual working program.Cybercriminals create crypters or buy them on underground markets.Crypters are available in the Russia, China, Germany, the U.S., and Brazil cybercrime underground markets. In a 2016 research on cybercrime and the Deep Web, Trend Micro found that crypters can be bought in various underground markets worldwide. Website advertising a crypter-modification training Underground markets were also found advertising crypter-modification training sessions and lessons on creating crypters Price of crypters in the Russian underground, 2011- 2013 As such, one input source file never produces an output file that is identical to the output of another source file.Ĭrypters abound in the cybercriminal underground market and are usually offered with the following pricing schemes: They use state-of-the-art algorithms that utilize random variables, data, keys, decoders, and so on. Polymorphic crypters are considered more advanced.Having a separate stub for each client makes it easier for malicious actors to modify or, in hacking terms, “clean” a stub once it has been detected by a security software. Static/statistical crypters use different stubs to make each encrypted file unique.Depending on the type of stub they use, crypters can be classified as either static/statistical or polymorphic. It is used by cybercriminals to create malware that can bypass security programs by presenting itself as a harmless program until it gets installed.Ī crypter contains a crypter stub, or a code used to encrypt and decrypt malicious code. A crypter is a type of software that can encrypt, obfuscate, and manipulate malware, to make it harder to detect by security programs.
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