When RSA CEO Art Coviello disclosed that the company had suffered a security breach, he categorized the attack as an Advanced Persistent Threat (APT) He also described the breach as a “an extremely sophisticated cyber attack in progress being mounted against RSA” In general, the industry uses the term APT to describe a targeted attack aimed at stealing sensitive information. Some people also describe APTs as “low and slow” attacks where an adversary penetrates a network but doesn’t do any immediate damage.”]
Source: https://www.csoonline.com/article/2228815/rsa-and-apt.html