So if the current thread is in a debugger, but running a single-threaded program, then the timing will be off. It also uses the beingdebugged flag as part of the XOR decoding process, so if you’re in a debugger the payload will not run properly.īut most interestingly, Xenon uses an undocumented NtYieldExecution interrupt that will give up the current thread’s execution time to any other thread. When we first looked, Xenon struck us as familiar in that it uses the same unhandledexceptionfilter chaining method to start the real code. In early 2016, Krypton was used along with Radamant ransomware. Ultimately, every crypter author aspires to effectively hide malware to render it virtually invisible to evade observation.
Parallels exist between Xenon crypter and Xenon, an odorless and colorless gas with very low chemical reactivity. The authors of these tools are acutely aware that researchers are poking at them, so they go to great lengths to evade detection and analysis.
Crypters sold on underground forums serve similar purposes, but are more focused on bypassing sandbox/antivirus detections. Many companies use crypters for legitimate purposes – to guard their systems, protect their code and products, and safeguard their intellectual property by protecting their binaries from reverse engineering. The crypter occupies a special place in this chain, where it’s typically used by threat actors to evade common security measures, such as antivirus and spam filters. We also provide a Python script to decrypt objects packed using Xenon and the Krypton crypter, which we believe is its predecessor.ĭelivering and monetizing malware involves a large chain of independent tools – exploit kits, traffic distribution systems, spambots and more. Xenon employs a novel trick to bypass debuggers, which we’ll describe here along with the techniques it uses.
#Cloud crypter install
We’ve recently observed a new crypter called Xenon used to deliver Locky, a strain of ransomware, and Ruckguv, a type of malware that can download and install other types of malware.
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