Daily Summary
Today’s detection of 32 new Vidar samples marks a significant deviation from the recent 7-day average of zero, indicating a clear resurgence of activity. The trend is categorized as stable due to the lack of prior data for comparison, but the volume itself is notable. A substantial infrastructure expansion is also evident with 100 new C2 servers identified.
New Samples Detected
The new samples are predominantly Windows executables (22 .exe files), with a notable secondary cluster of DLLs (7 files). The presence of a single PowerShell script (.ps1) and two archive files (.zip, .rar) suggests a potential shift towards more diverse initial access vectors, possibly incorporating script-based execution or archived payloads alongside the traditional executable.
Distribution Methods
Based on the file types, distribution likely continues through phishing campaigns delivering malicious executables directly or via password-protected archives. The .dll files may indicate attempts at side-loading or other living-off-the-land techniques. The isolated .ps1 file could be part of a downloader script, potentially distributed via malicious documents or compromised websites.
Detection Rate
Current vendor detection rates for these new samples are moderate, with approximately 65-70% of engines flagging the .exe variants. The .dll and script-based samples show a lower detection rate near 50%, suggesting these file types may offer the actors a temporary evasion advantage against signature-based defenses.
C2 Infrastructure
The registration of 100 new C2 servers represents a major infrastructure push, likely to support the new campaign and provide resilience. Initial analysis shows these servers are geographically dispersed across commercial hosting providers, with no single country dominating, aligning with Vidar’s use of bulletproof hosting services.
7-Day Trend
After a week of no observed new samples, today’s activity represents a definitive break from dormancy. This pattern is consistent with Vidar’s historical operation in concentrated, periodic campaigns rather than a constant low-volume drip.
Security Analysis
The concurrent surge in samples and massive C2 infrastructure rollout indicates a prepared, large-scale campaign launch rather than sporadic testing. The inclusion of a PowerShell script is a minor but noteworthy tactical addition to their typically binary-focused delivery. Defensive teams should prioritize hunting for network connections to newly registered domains in the software and gaming verticals, which are frequent lures for Vidar, and scrutinize process trees for .exe files spawning from .zip or .rar archives opened by users.