This was because hackers used the same command and control techniques that infiltrated RSA to target 760 companies around the world.

US-based security blogger, Brian Krebs, who has , wrote that many of the network owners listed are ISPs and were included because some of their subscribers were hit.

"It is not clear how many systems in each of these companies or networks were compromised, for how long those intrusions persisted, or whether the attackers successfully stole sensitive information from all of the victims," Krebs wrote.

"Finally, some of these companies, such as the anti-virus vendors, may be represented because they intentionally compromised internal systems in an effort to reverse engineer malware used in these attacks."

RSA president, Tom Heiser, recently said the . The information stolen was compressed and encrypted before it was exfiltrated, making it more difficult to identify.