![]() ![]() įor installation, threat actors prefer to abuse a legitimate installer, which is patched with malicious and encrypted shellcode. In reality, this installer contains a malicious JavaScript payload, which redirects its victims to download the malicious MSI installer. Security researchers have found that attackers often use a technique known as "watering hole", which involves injecting browser exploits into compromised websites, giving attackers access to the systems of visitors.įurther analysis shows that targeted visitors are prompted by a “Codec Error” to lure the victims into installing the malicious payload disguised as Advanced Video Codec - AVC1. Since 2019, Earth Kitsune has been distributing custom-designed backdoors to specific targets, mainly those interested in North Korea. Earth Kitsune Malware (WhiskerSpy Backdoor) Picus Threat Library includes the following threats for ESXiArgs ransomware :įor more information, visit our latest blog on the ESXiArgs ransomware. We strongly suggest simulating ESXiArgs ransomware attacks to test the effectiveness of your security controls against ransomware attacks using the Picus The Complete Security Validation Platform. However, newer variants encrypt 50% of the data if the file size is over 128 MB, making it nearly impossible to recover the data without the key. One key factor that differs ESXiArgs ransomware from other ransomware families is that earlier variants did not encrypt a large portion of data if the file size was over 128 MB, which allowed researchers to recover virtual machines in some cases. Since it is not the only initial access vector, some organizations that have patched their vulnerable ESXi servers or disabled SLP service can still get infected with ESXiArgs ransomware.Īlthough not all initial access methods are known, victim statistics indicate that over 3,800 servers in France, Germany, the US, Canada, and the Netherlands were infected. Įven though this vulnerability was disclosed two years ago and had a CVSS score of 9.8 (Critical), some organizations still run outdated or unpatched ESXi versions, which makes them potential targets for these attacks. On February 8, 2023, CISA, FBI, and CERT-FR published security advisories on ESXiArgs ransomware that exploits known a vulnerability, CVE-2021-21972, in VMware ESXi software with publicly facing ESXi hypervisors. ESXi Args Ransomware (CISA Alert AA23-039A) Simulate Emerging Cyber Threats with 14-Day Free Trial of the Picus Platform Top Cyber Threats of February 2023ĮSXi Args Ransomware (CISA Alert AA23-039A)Įarth Kitsune Malware (WhiskerSpy Backdoor)ġ. You can easily simulate these threats and validate and improve your security controls against them with the Picus Complete Security Validation Platform. This blog briefly explains the top four cyber threats observed in February 2023. Luckily, Picus Labs quickly responded by adding attack simulations for these emerging threats to the Picus Threat Library. February was another challenging month for cybersecurity, with new malware families, ransomware campaigns, and even a zero-day vulnerability making their way onto the scene.
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