Attackers Disguise RedLine Stealer as Microsoft Windows 11 Upgrade site


Threat actors are always looking for topical lures to socially engineer victims into infecting systems. We recently analyzed one such lure, namely a fake Windows 11 installer. On 27 January 2022, the day after the final phase of the Windows 11 upgrade was announced, we noticed a malicious actor registered the domain windows-upgraded[.]com, which they used to spread malware by tricking users into downloading and running a fake installer. The domain caught our attention because it was newly registered, imitated a legitimate brand and took advantage of a recent announcment. The threat actor used this domain to distribute RedLine Stealer, an information stealing malware family that is widely advertised for sale within underground forums.

Domain Name: windows-upgraded.com
Creation Date: 2022-01-27T10:06:46Z
Registrar: NICENIC INTERNATIONAL GROUP CO., LIMITED
Registrant Organization: Ozil Verfig
Registrant State/Province: Moscow
Registrant Country: RU

The attackers copied the design of the legitimate Windows 11 website, except clicking on the “Download Now” button downloads a suspicious zip archive called Windows11InstallationAssistant.zip. The file was hosted on Discord’s content delivery network.



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