A massive attack, hitting about 760 companies earlier this year, led up to security vulnerabilities in SecurID tags. A few of these companies include, Microsoft, Amazon, Google, Cisco, Intel, IBM, Abbot Laboratories, Charcles Schwab and Wells Fargo.
Many Internet Service Providers (Comcast, AT&T, Sprint and Verizon for example) were also on the list of names of companies that were attacked. However it is believed these companies were attacked through their subscribed customers, and not a direct breach of their own security.
The attack started from a command and control server that was attack and taken over. However, no one knows yet just how that had happened. Anti-Virus company McAfee actually let their system become infected with the malware so they could try and reverse engineer the code.
Considering most of these companies were Fortune 500 companies, many security analysts have rightfully shown cause for concern.