The US Postal Service website received an unwelcome delivery this week of a new attack rapidly spreading among legitimate websites. USPS became the latest victim of the so-called "Blackhole" toolkit, a wildly popular website attack kit that's easy to use and provides obfuscation features that help it evade antivirus detection.
USPS officials have since taken down the Rapid Information Bulletin System pages for intelligent mail services, such as tracking and logistics.

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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