From Yairon Escalona:
USB-AV Antivirus Free is designed in LUA, one this makes a major speed and precision in detection of any threats that propagate for USB devices. In spite of the daily updates USB-AV it possesses several skills of heuristic search to detect the new unknown virus variants until now. USB-AV only is activated after a new unit got connected in USB ports. It is designed to run at full speed! without making the system slow. The Malware databases are published every day, These files contain the descriptions of last threats brought by our users and by collaborators of several countries of the world. To avoid false positives each of the threats are certified by VirusTotal before being published. The Free version features compatible with all security software and prevent data leakage via USB removable devices.