Don’t worry, they’re not very difficult to create. The diagram above illustrates the processing flow in a crypter.Īs you can tell there are 3 important component that we will have to write. In the current state crypters are some of the most effective AV evasion tools in the hands of blackhats, and in my opinion any tool out of the hands of blackhats is a win for the whitehats. The truth is that they are far too effective against AV for something so easy to write, and maybe if enough of them get made and released publicly there will be enough of an incentive for AV vendors to come up with better solutions for detecting them. I do hope though that you’ll take this opportunity to try to make your own. I used to be under this misconception that they’re this thing only the elitest of the elite would ever lay their hands on, but the truth is that they are very easy and fun to make (as long as you avoid a few pitfalls) and yet are profoundly effective in bypassing AV. In essence, it’s a tool for bypassing AV and obfuscating scripts and executables by employing encryption and obfuscation techniques. The purpose of this article is to discuss it at a high enough level that you can take the ‘design principles’ and apply them to any language that you want and make your own, though you’re free to follow along in PowerShell if you care to.īefore we get into it, we need a clear idea of what a crypter is.
Kazy crypter how to#
I will be using an earlier in-development version of my recently released free and open-source PowerShell crypter Xencrypt as the basis for my examples (and that’s the tool you see in action in the screenshot above) as I walk you through how to design and implement your own crypter.
Today I will be showing you how to write your own crypter in any language you want.
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