"Whitehole uses similar code to Blackhole, one of the most popular toolkits today, but with some differences," as Trend Micro security researchers specified in a blog. For one thing, Whitehole only contains exploits targeting known Java vulnerabilities. Among other features, Whitehole has the ability to evade antivirus detection, is untraceable and cannot be blocked by Google's Safe Browsing secure browsing feature, and it can load up to 20 malicious files at a time.