Telegram 0-day exploit is used by Russian hackers to deliver crypto miners

Cryptocurrency mining malware can now be installed into victims devices by using a zero-day vulnerability in the Windows client for the Telegram instant messaging service. This zero-day stays in the way of how the Telegram Windows client handles the RLO (right-to-left override) Unicode character. The primary character purpose is to switch between RTL to LTR text display. Cybercriminals found a way to take advantage of this, they distributed, using Telegram, messages containing file attachments that included the RLO character in their name, which leads to changed text display direction right in the middle of the file’s name ( Ex: photo_high_re*U+202E*gnp.js, *U+202E* is the RLO character).

In this case, when the name was rendered on screen the file appeared: photo_high_resj.png.
This file once opens it delivers to victims backdoors, spyware, and miners. The file can do this because it is not a picture, it is a JavaScript file that downloads and install malware.
This campaign was focused on mining Monero, Zcash, and Fantomcoin primarily using mining malware payloads. Just in a few cases, the zero-day was used to deliver backdoor trojan or any other spyware tools.

The Telegram 0-day was exploited only in Russia. Somehow just the Russian cybercriminals were aware of this vulnerability and took advantage of it. For now, it is impossible to tell how many victims and Telegram versions were affected, but we suspect the numbers are high.

We believe this security breach is active since March 2017 meaning that many users encounter it without knowing it exists.
In cases like this, it is best for every user’s cybersecurity to have on their devices antivirus solutions installed, because only by doing this their data and privacy remain intact.

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Regular users are the most affected by malware this day because most of them do not care about what antivirus they have installed in their systems.
Users can download antivirus developed by our company directly by clicking the download banner from the end of the page.
Our free download antivirus can help users to protect their Mac or Windows devices against malware and adware.
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Most of the companies don't care about cybersecurity until they suffer a breach.
A healthy company must perform a penetration test from time to time. The penetration test must execute against all the assets of the company, including the workers who are the most vulnerable to the social engineering attacks.
A penetration test can be done either by a security specialist from inside of the company or by hiring an external cyber security company who can take care of everything.
Besides penetration test, a company must have a minimum healthy cybersecurity system installed like antivirus or firewall.
CyberByte company can perform various penetration tests on all the spectrum of PCI/DSS compliance to the red team, perimeter testing, and social engineering.
We also provide services to employee profiling and cyber threat monitoring, since most of the data breaches this day come from the inside of the company.
To check our penetration test services go to the Services tab from the main menu.

Windows users can download free antivirus solution CyberByte by clicking the banner. The free antivirus will help you to know if your PC is infected. Windows free antivirus of CyberByte is an awarded software for malware detection.

Mac / MacOS / OS X users can download free Mac antivirus solution CyberByte by clicking the banner. The free antivirus will help you to know if your Mac is infected. MacOS / OS X free antivirus of CyberByte is an awarded software for malware detection. The free antivirus for Mac is available for new MacOS and older OS X versions.

Features of CyberByte™ antivirus:

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Don’t negotiate with ransomware cyber terrorists – keep your Mac safe and don’t ever end up paying for what is already yours.

Protect others as well – the CyberByte™ Protection Engine  not only detects the threat but stops it from spreading to other Macs or Windows machines.

Don’t let strangers use your resources – more than 80% of the attacks are crypto mining driven. Are you sure your computer is not mining for crypto while you read this text?

Our malware protection will continuously look after your device providing the best security against viruses. Give us the chance to prove it by downloading the antivirus for your device.

CyberByte Antivirus is a certified product by OPSWAT (OPSWAT is a San Francisco-based software company that provides solutions to secure and manage IT infrastructure. Founded in 2002, OPSWAT delivers solutions that provide manageability of endpoints and networks, and that help organizations protect against
zero-day attacks by using multiple antivirus engine scanning and document sanitization.
To learn more about OPSWAT’s innovative and unique solutions, please visit http://www.opswat.com).

CyberByte Antivirus comes in two flavors:
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Install it using the antivirus installer package.
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CyberByte antivirus will show if any files are infected after the scan is finished.

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