(Bloomberg) -- Hackers launched a wave of sophisticated attacks on Wall Street firms in recent days, targeting information systems at major money managers, according to people familiar with the matter. Most Read from BloombergThe attackers attempted to breach information systems at some of the world's biggest hedge funds including Two Sigma Investments, Citadel and Point72 Asset Management, the people said, asking not to be identified discussing non-public information. "Before they could attack 50 entities in a targeted attack, now they can do 1,000," Paul said. In June, a cybersecurity unit at Google published a blog post noting a wave of attacks this year against law firms and other professional services companies. Those attacks also involved vishing techniques and even in some cases featured individuals entering corporate offices posing at IT workers, the post said.