![]() ![]() ![]() Based on the uniqueness of the first layer it is also safe to assume that authors of OnionCrypter offer the option of a unique stub file to ensure that encrypted malware will be undetectable. We believe that likely the authors of OnionCrypter offer it as an encrypting service. Its widespread use and length of time in use make it a key malware infrastructure component. ![]() In the last three years we have protected almost 400,000 users around the world from malware protected by this crypter. ![]() This includes some of the best known-most prevalent families such as Ursnif, Lokibot, Zeus, AgentTesla, and Smokeloader among others. Most interestingly, we have found that OnionCrypter has been used by over 30 different malware families since 2016. This can help malware analysts because seeing samples like these might get confusing and overwhelming at first not only for humans but also for dynamic analysis sandboxes. This blogpost covers most of the techniques OnionCrypter used to complicate analysis and breaks down its structure. It’s important to note the name reflects the many layers this crypter uses, it’s in no way related to the TOR browser or network. Because of this we are calling it “OnionCrypter”. One of the key techniques this crypter uses is multiple layers of encryption. The crypter discussed in this blogpost uses a combination of multiple interesting techniques that make it hard for analysts and for proper detection. This stub looks like an innocent program, it may also perform some tasks which are not harmful at all but its primary task is to decrypt a payload and run it. A crypter encrypts a program, so it looks like meaningless data and it creates an envelope for this encrypted program also called a stub. One possible solution for this are crypters. The app is easy to install, comes with a novice-accessible UI, has an almost non-existing learning curve, and it can be run just as efficiently on the most relevant OSes to date.One of the goals of malware authors is to keep their creation undetected by antivirus software. Taking everything into consideration, Crypter is a single-purpose and very efficient app that, even though, it hardly impresses, has the potential to do wonders for your privacy. One of the most convenient ways to protect your privacy The encrypted files are located in the same location as the original file and have the '.crypto' extension attached. You can encrypt and decrypt files by selecting them from their original location (using the typical Windows Explorer method) or via intuitive and more convenient drag and drop gestures.Īs expected, the process is directly proportional to the file's size. From this point onwards you can easily start encrypting or decrypting any number of files or folders, without the need to use your master password. Once you log in, the application displays its compact main window with a ultra-minimalist, yet quite a stylish user interface. Also noteworthy is the fact that the app uses a PBKDF2 key to derive the master password. Please note that the password should be at least eight characters long and it should contain at least one letter, one number, and one special character. The app can be deployed on your computer's system within seconds, mainly thanks to its streamlined installation process, at the end of which, you will be prompted to set a master password for encryption. Easy-to-install app that works on all the key OSesīefore anything else, you should also know that Crypto is a cross-platform app which means that you can use it on all the major OSes out there, namely Windows, macOS and Linux. In just a few words, Crypter is a modern and lightweight piece of software that proposes a slick and fast way to encrypt and decrypt files. Nowadays, encrypting your most sensitive data is something that should be common practice for all users that want to make sure their privacy stays untouched in all those I-wish-it-never-happens-to-me situations.įortunately, there are tons of apps that can lend you a helping hand towards encrypting your data with ease, for example, Crypter. ![]()
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