Daily Summary
Vidar activity surged today with 70 new samples, an 85% increase over the 7-day average of 38, marking a sharp escalation after several days of below-average volume. The spike is driven primarily by .exe payloads, with a notable presence of unnamed executable extensions that suggest targeted packing or staging variants.
New Samples Detected
Today’s 70 samples are heavily dominated by compiled executables (29 .exe, 3 .dll, 2 .ps1), but the emergence of 7 unique numeric extensions (e.g., .45211965, .11482139) is a departure from typical Vidar distribution. These extension types are uncommon for Vidar’s standard infostealer payloads and likely represent staged or second-stage downloads that avoid static detection. The absence of .vbs or .js files, which Vidar frequently uses for initial access, may indicate a shift toward direct executable delivery or an updated loader workflow.
C2 Infrastructure
64 new C2 servers were identified today, a high count relative to sample volume that suggests botnet churn or infrastructure rotation. No geographic clustering is reported, but the volume implies Vidar operators are cycling endpoints aggressively to evade sinkholing. This rate of C2 turnover outpaces typical Vidar campaigns, which usually deploy 20-40 new servers per day for equivalent sample counts. The disparity may reflect automated server provisioning or a campaign targeting multiple regions simultaneously.
7-Day Trend
Today’s 85% surge above the 7-day average (38) reverses a 2-day downward trend where sample counts dipped to 30 and 25. The increase is statistically significant and aligns with patterns seen before Vidar’s previous major credential-theft campaigns. If tomorrow’s count stays above 45, this likely marks the start of a sustained wave rather than a one-day anomaly.
IOC Highlights
134 new IOCs were logged today, with 64 tied exclusively to C2 infrastructure. The remaining 70 IOCs correspond to sample hashes, with the 7 numeric extensions representing uploads that may evade hash-based detections. Notably, no IPs or domains are specified, so teams should request or review the full IOC list from your threat intel platform. The numeric extensions suggest these samples use randomized filenames, increasing the difficulty of community-based reputation blocking.
Security Analysis
The emergence of numeric-only executable extensions (like .45211965) is atypical for Vidar and may indicate a new packer or delivery mechanic that generates unique, non-predictable file extensions to bypass application control policies. This tactic has been common in Gozi/Ursnif variants but is rare in Vidar’s known toolset, possibly signaling code reuse or a shared infrastructure. Defenders should immediately review endpoint detections for files with 8-digit numeric extensions and ensure that any process launching from such files is subject to behavioral analysis, especially outbound connections to non-standard ports or domains with low reputation.