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<div style="margin:0px;font-size:14.67px;background-color:white !important">I hope everyone is doing well!</div>
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<div style="margin:0px;font-size:14.67px;background-color:white !important">Below is the entry for today.</div>
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05/26/2022 - Diary entry #519<br>
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This month a new ransomware strain was disclosed. Self-named "Cheers", the ransomware operates in the double-extortion model, stealing data before encrypting and then threatening to publish stolen data if the ransom is not paid. Cheers seem to be a new threat,
having IOCs dated from March this year.
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<div>What is curious about Cheers, is the focus on VMWare ESX hypervisor. Upon infecting a VMWare ESXi system, the malware enumerates all virtual machines, shuts them down, and encrypts the snapshots, memory and virtual disk files of each machine. It's not
the first time a malware was disclosed targeting ESX servers. More recently, in our Daily Diary #440, we covered Lockbit with a similar behavior.</div>
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<div>For the encryption, it uses the SOSEMANUK stream cipher (just like Wanluowang Ransomware, covered in our Daily Diary #494). After the encryption phase is done, the malware drops a ransom note, asking for contact within 3 days, threatening to publish some
files and raise the prices if the contact is not made. The ransom note also contains a link for a deep web page, where the victims can negotiate.</div>
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This incident is yet another example of why companies should take special care with hypervisor servers. From an attacker's point of view, it's a very valuable target. With only one attack, you can damage tons of other machines and shut down critical pieces
of the infrastructure. Companies should adopt a ZeroTrust model, limiting the access to those servers into segmented networks, reducing the changes of an attacker being able to reach it.
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<span style="margin:0px;background-color:white !important"><span style="margin:0px;font-size:14.67px;background-color:white !important">Kind Regards,</span></span></div>
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<strong>Felipe Duarte Domingues</strong><br>
Manager, MART<br>
<strong>Appgate</strong></p>
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E:<span> </span><font color="#228ebe"><a href="mailto:felipe.duarte@appgate.com" title="mailto:felipe.duarte@appgate.com">felipe.duarte@appgate.com</a></font><br>
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