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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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<div style="margin:0px;font-size:14.67px;background-color:white !important">04/01/2021 - Diary entry #424<br>
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<div>First discovered in 2018, Purple Fox is a Rootkit/Backdoor made to attack, escalate privileges, get persistence and stealthily receive commands from a C&C server. Purple Fox installs a driver and modifies several files, with the goal of hiding its files,
connections, and block the initiation of AV processes in the system.</div>
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<div>This week a new campaign of Purple Fox was found, using a tampered Telegram Installer to attack windows systems.</div>
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<div>In this campaign, the malware dropper is delivered through a fake Telegram installer. The file, named Telegram desktop.exe, creates a directory under the user's temporary folder, and drops the real telegram installer, along with an AutoIt Downloader. The
AutoIt Downloader retrieves more files from a C&C server, being Purple Fox one of them. What is curious about this behavior is the amount of files downloaded. As the malware functions are spread into several files, it makes harder for AVs solutions to detect
all the samples and block all the functionalities.</div>
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To be protected against this kind of attack, it's important to always double check any downloaded installer before executing it, making sure it's signed with a trusted entity (in this case, Telegram itself).<span style="margin:0px"></span>
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<span style="margin:0px;font-size:14.67px;background-color:white !important">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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