Michael Sutton, vice president of research at Zscaler, which discovered the infected site and alerted the USPS, says the attack contained multiple payloads. "It's quite robust: It doesn't just have one or two payloads. We tracked down seven or eight, and it's intelligently delivering them," Sutton says. "Blackhole has done a good job at encrypting the payloads, and that's why [many antivirus packages] are not detecting it."
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