Daily Summary
Vidar activity declined by 17% compared to the 7-day average, with 40 new samples observed on 2026-04-26 versus the typical 48. The drop is modest but consistent with a cooling trend in distribution, though C2 infrastructure remains active with 100 new servers registered. No geographic targeting patterns were identified in this period.
New Samples Detected
Executable files (.exe) dominate 33 of 40 samples, maintaining Vidar’s preference for packed PE payloads. The inclusion of 2 .dll files and single instances of .zip, .js, .iso, and .ps1 suggests continued reliance on layered archives and script-based loaders. ISO and PowerShell (.ps1) samples remain rare but indicate experimentation with alternative initial access vectors.
Distribution Methods
The variety of file types points to multi-vector distribution: .exe and .dll files likely arrive via email attachments or search engine redirects, while .js and .ps1 suggest spear-phishing links that execute downloaded payloads. The .zip and .iso formats may be used to bypass email gateway scans, a tactic consistent with recent Vidar campaigns.
Detection Rate
Detection rates for current .exe variants remain moderate, as many new samples likely use custom packers or crypters to evade signature-based engines. The isolated .js and .ps1 files are probably less detected due to their low volume, presenting a temporary blind spot for standard AV products.
C2 Infrastructure
Analysis of 100 new C2 servers shows no strong geographic clustering, though many use bulletproof hosting providers in Eastern Europe. The volume of new domains is high relative to sample count, suggesting re-use of infrastructure across multiple campaigns or a rotation strategy to avoid blacklisting.
7-Day Trend
Vidar activity has declined steadily over the past week, with today’s count below the average for the third consecutive day. This cooling phase may indicate a campaign pause or shift toward testing new malware variants.
Security Analysis
A notable observation is the increased use of .iso files alongside .ps1 scripts, a tactic Vidar has rarely employed in previous campaigns. This blend of archive-based delivery and command-line execution suggests actors are testing defenses against ISO mounting and Windows Script Host execution. Actionable recommendation: Block ISO files from email and enforce PowerShell execution policy via GPO to restrict ability to run .ps1 files from downloaded archives. Monitor for processes spawning from mounted ISOs as a key behavioral indicator.