State-sponsored hackers from China, Iran, North Korea and Turkey have started testing, exploiting and using the Log4j bug to deploy malware, including ransomware, according to Microsoft. As predicted by officials at the US Cybersecurity and Infrastructure Security Agency (CISA), more sophisticated attackers have now started exploiting the so-called Log4Shell bug (CVE-2021-44228), which affects devices and applications running vulnerable versions of the Log4j Java library.

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