Fraudulent domains masquerading as Microsoft’s Windows 11 download portal are attempting to trick users into deploying trojanized installation files to infect systems with the Vidar information stealer malware.
“The spoofed sites were created to distribute malicious ISO files which lead to a Vidar info-stealer infection on the endpoint,” Zscaler said in a report. “These variants of Vidar malware fetch the C2 configuration from attacker-controlled social media channels hosted on Telegram and Mastodon network.”
Some of the rogue distribution vector domains, which were registered last month on April 20, consist of ms-win11[.]com, win11-serv[.]com, and win11install[.]com, and ms-teams-app[.]net.
In addition, the cybersecurity firm cautioned that the threat actor behind the impersonation campaign is also leveraging backdoored versions of Adobe Photoshop and other legitimate software such as Microsoft Teams to deliver Vidar malware.
The ISO file, for its part, contains an executable that’s unusually large in size (over 300MB) in an attempt to evade detection by security solutions and is signed with an expired certificate from Avast that was likely stolen following the latter’s breach in October 2019.
Source: TheHackerNews