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Vidar Infostealer Campaigns Employ New Obfuscation Techniques

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2 unique sources, 2 articles

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Vidar infostealer, active since late 2018, has resurfaced with enhanced stealth and persistence mechanisms. This malware-as-a-service targets a wide range of sensitive data, including credentials, OS details, cookies, financial data, and authentication tokens. It spreads through phishing, compromised websites, and malvertising. New techniques include encrypted C2 channels, LOLBins abuse, and covert exfiltration methods. The malware employs PowerShell scripts for initial infection, uses obfuscation at every stage, and evades defenses by disguising traffic, suppressing errors, and randomizing filenames. It also creates scheduled tasks for persistence and hooks into CryptProtectMemory API to access encrypted data. The C2 server uses TLS encryption for data exfiltration. Vidar 2.0, released in October 2025, has been rewritten in C, supports multi-threading for data theft, and includes extensive anti-analysis checks. It bypasses Chrome's App-Bound encryption and captures screenshots, sending data to delivery points including Telegram bots and URLs stored on Steam profiles.

Timeline

  1. 22.10.2025 01:26 1 articles · 23h ago

    Vidar 2.0 released with enhanced data theft and evasion capabilities

    Vidar 2.0, released in October 2025, has been rewritten in C, reducing dependencies and improving performance. It supports multi-threading for data theft, reducing dwell time. The malware includes extensive anti-analysis checks, such as debugger detection and hardware profiling. It employs polymorphism options with heavy control-flow flattening for evasion. Vidar 2.0 bypasses Chrome's App-Bound encryption by injecting malicious code into browser processes. It captures screenshots and sends data to delivery points including Telegram bots and URLs stored on Steam profiles.

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  2. 11.09.2025 19:23 2 articles · 1mo ago

    Vidar Infostealer Campaigns Employ New Obfuscation Techniques

    Vidar 2.0, released in October 2025, has been rewritten in C, reducing dependencies and improving performance. It supports multi-threading for data theft, reducing dwell time. The malware includes extensive anti-analysis checks, such as debugger detection and hardware profiling. It employs polymorphism options with heavy control-flow flattening for evasion. Vidar 2.0 bypasses Chrome's App-Bound encryption by injecting malicious code into browser processes. It captures screenshots and sends data to delivery points including Telegram bots and URLs stored on Steam profiles.

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