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<span style="margin:0px;font-size:12pt;background-color:rgb(255, 255, 255)"><span style="margin:0px;font-size:14.67px">Hello,</span></span></div>
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<div style="margin:0px;font-size:14.67px;background-color:white">I hope everyone is doing well!</div>
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<div style="margin:0px;font-size:14.67px;background-color:white">Below is the entry for today.</div>
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<div style="margin:0px;font-size:14.67px;background-color:white">08/31/2021 - Diary entry #338<br>
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LockFile Ransomware is a new Windows Ransomware strain that emerged last month. First covered in our Daily Diary #331, samples from this ransomware have been found exploiting unpatched ProxyShell flaws using a technique called PetitPotam.
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<div>LockFile implements a new technique when encrypting files. Instead of encrypting the entire file, it only encrypts every other 16 bytes. The result is a partially readable document that can bypass protection technologies like "chi-squared (chiČ) analysis",
that supposedly detect encrypted documents. Other ransomware families, like LockBit and Darkside, also implements partial encryption, encrypting only the first blocks of the file, but they do that to increase performance, allowing the ransomware to spend less
time encrypting a single file, and are not enough to bypass this kind of analysis algorithm.</div>
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<div>Curiously, the ransom note visual is very similar to LockBit 2.0, but the only available forms of contact are e-mail and TOX (A P2P encrypted communication software). The ransom note also contains a link to a website on the onion network for the ransom
payment. So far, nothing shows that the group is operating in the double-extortion model, as they make no claims that data was stolen and no wall-of-shame website has been found yet.</div>
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<span style="margin:0px;font-size:14.67px;background-color:white">Kind Regards,</span></div>
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<strong>Felipe Duarte Domingues</strong><br>
Security Researcher<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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