Analysis Summary

Vidar, which first appeared in late 2018, is a malware family that primarily acts as an information stealer and is frequently seen as a prelude to ransomware distribution. This malware takes data and distributes it as spam email, cracked commercial software, and keygen programs. Vidar can scrape a wide range of digital wallets in addition to credit card data and passwords. Various campaigns can be used to propagate this malware. It allows data such as system information, browser data, and passwords to be captured and exfiltrated from a system. Vidar has also been seen as a secondary payload in ransomware attacks like STOP/DJVU.

Researchers discovered newly registered domains created by a threat actor to spoof Microsoft's official Windows 11 OS download portal in April 2022. The fake sites were set up to spread malicious ISO files that infect endpoints with the Vidar infostealer. These Vidar malware variants fetch their C2 configuration via attacker-controlled Telegram and Mastodon social media channels.

Impact

• Data Exfiltration
• Information Theft
• Exposure of Sensitive Data

Indicators of Compromise

SHA1

• 1b41384eeda912ed7c55ca5ecd736a7ffb6ac6f1

• 61ebe4ad93e96ada7cc440614f365d65212d8fcc

• 8c008cbf6bd4b25feae62a13ee9573f11276d462

• f0fdf608077a35108b9dbe80c53ec109023b46f2

• b79b58ae3bed194eceb76cf697047849a8c7b62f

Remediation

• Block all threat indicators at your respective controls.
• Search for indicators of compromise (IOCs) in your environment utilizing your respective security controls.
• Ensure that general security policies are employed including implementing strong passwords, correct configurations, and proper administration security policies.
• Limit access to administrative accounts and portals to only relevant personnel and make sure they are not publicly accessible.
• Patch and upgrade any platforms and software timely and make it into a standard security policy. Prioritize patching known exploited vulnerabilities and zero-days.
• Enable antivirus and anti-malware software and update signature definitions on time. Using multi-layered protection is necessary to secure vulnerable assets.