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In addition, registers are selected dynamically. The encoder stud is generated based on dynamic instruction substitution and dynamic block ordering. Using the encoder, the malware runs through several decode loops, where one loop decodes the next layer, until the final shellcode payload is decoded and executed. The malware uses the “ Shikata Ga Nai” polymorphic XOR additive feedback encoder, which is one of the most popular encoders used in Metasploit.

Malicious ELF file with a total of only 376 bytes.

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The main dropper of the malware is a very small ELF file, where its total size is around only 370 bytes, while its actual code size is around 300 bytes. Shikitega uses an infection chain in multiple layers, where the first one contains only a few hundred bytes, and each module is responsible for a specific task, from downloading and executing Metasploit meterpreter, exploiting Linux vulnerabilities, setting persistence in the infected machine to downloading and executing a cryptominer. New malwares like BotenaGo and EnemyBot are examples of how malware writers rapidly incorporate recently discovered vulnerabilities to find new victims and increase their reach.

With a rise of nearly 650% in malware and ransomware for Linux this year, reaching an all-time high in the first half year of 2022, threat actors find servers, endpoints and IoT devices based on Linux operating systems more and more valuable and find new ways to deliver their malicious payloads.

Shikitega abuse legitimate cloud services to store some of its command and control servers (C&C).įigure 1.The malware uses a polymorphic encoder to make it more difficult to detect by anti-virus engines.Shikitega exploits system vulnerabilities to gain high privileges, persist and execute crypto miner.The malware downloads and executes the Metasploit’s “Mettle” meterpreter to maximize its control on infected machines.

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An attacker can gain full control of the system, in addition to the cryptocurrency miner that will be executed and set to persist. Shikitega is delivered in a multistage infection chain where each module responds to a part of the payload and downloads and executes the next one. See System Requirements for additional information.AT&T Alien Labs has discovered a new malware targeting endpoints and IoT devices that are running Linux operating systems. Not all features may be available on all devices. Product features may be added, changed or removed during the subscription term. Subscriptions covering "all" devices are limited to supported devices that you own.

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