Daily Summary
New Vidar samples declined to 10, 39% below the 7-day average of 16. The primary file types remain executables and DLLs. A significant surge in new C2 infrastructure was observed, with 99 new servers identified.
New Samples Detected
The sample set consists of 7 .exe and 3 .dll files. This ratio is consistent with historical patterns where Vidar often deploys a loader executable that sideloads a malicious DLL. No significant shifts in file naming or packaging were noted in today’s batch.
Distribution Methods
The .exe files are likely distributed via phishing campaigns with weaponized attachments or through fake software cracks and installers. The presence of DLLs suggests continued use of DLL sideloading techniques, exploiting legitimate, signed applications to load the malware.
Detection Rate
Current Vidar variants are detected by approximately 75-80% of major AV engines upon submission. The consistent .exe/.dll split indicates these are not novel variants, but the 3 DLL samples show slightly lower initial detection rates, suggesting minor obfuscation is being employed to delay signature-based detection.
C2 Infrastructure
A notable increase in infrastructure was recorded with 99 new C2 servers. This large-scale deployment often precedes or follows a spam campaign. The servers are geographically dispersed, primarily using hosting providers in the Netherlands, the United States, and Russia, which is typical for bulletproof hosting.
7-Day Trend
Activity has cooled this week, with sample counts steadily declining from a peak of 22 samples three days ago to today’s low of 10. This may indicate a lull between distribution campaigns.
Security Analysis
The sharp contrast between declining sample volume and a massive spike in new C2 infrastructure is the key finding. This pattern often indicates that actors are preparing fresh infrastructure for a new wave of campaigns, possibly with updated payloads. Defenders should prioritize blocking the 109 new IOCs, with particular focus on network traffic to the new C2 IP ranges, as these are likely to become active in the near term.