Black Vine has been singled out as the attacker behind the Anthem hack, Symantec says. The hack is believed to be the largest waged against a U.S. health care company. Black Vine uses zero-day vulnerabilities in Microsoft Internet Explorer to launch watering-hole attacks. The group has deep pockets, giving the group the resources to customize malware, the research company says. Some Black Vine members have ties to Topsec, a Chinese IT security company, the report says. It says the group has access to Edlerwood framework, a platform for distributing new vulnerabilities.”]