“How did a hacker manage to infiltrate one of the world’s top computer-security companies? And could the data that was stolen be used to impair its SecurID products, which are used by 40 million businesses that are trying to keep their own networks safe from intruders?

In the attack on RSA, the attacker sent “phishing” e-mails with the subject line “2011 Recruitment Plan” to two small groups of employees over the course of two days. Unfortunately, one was interested enough to retrieve one of these messages from his or her junk mail and open the attached Excel file. The spreadsheet contained malware that used a previously unknown, or “zero-day,” flaw in Adobe’s Flash software to install a backdoor. RSA said that Adobe had since released a patch to fix that hole.”

From The New York Times