![]() ![]() Signatures represent a reactive mechanism against known threats. However, polymorphic code tactics counter-balance the effects of signature-based removal. Malicious code is identified over the course of a few days as it spreads. ![]() For example, consider the time lag in signature development due to the need for vulnerability disclosure and/or the mass spread of an attack to catch the attention of researchers. This leaves a gaping hole in network defenses that remain vulnerable to zero-day and targeted advanced persistent threat (APT) attacks. These systems rely heavily on signatures and known patterns of misbehavior to identify and block threats. Traditional protections, like traditional and next-generation firewalls, intrusion prevention systems (IPS), anti-virus (AV) and Web gateways, only scan for the first move, the inbound attack. Most of today's attacks are targeted to get something valuable-sensitive personal information, intellectual property, authentication credentials, insider information-and each attack is often multi-staged with pre-meditated steps to get in, to signal back out of the compromised network, and to get valuables out. They have replaced the broad, scattershot approach of mass-market malware designed for mischief with advanced tactics, techniques, and procedures. Today's cyber attacks have changed radically from just a few years ago. ![]()
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