An unauthorized procedure or activity on a digital network system is referred to as network intrusion. Detecting an intrusion requires defenders to have a thorough understanding of how attacks work. Network intrusions frequently involve the theft of valuable network resources and almost always jeopardize network and/or data security. The following are some of the most common network intrusion attack techniques that businesses should be on the lookout for:
Living Off the Land: Attackers are increasingly using existing tools and processes, as well as stolen credentials, to compromise networks. Operating system utilities, business productivity software, and scripting languages are clearly not malware and have very legitimate uses. In fact, the vast majority of usage is business justified in most cases, allowing an attacker to blend in.
Multi-Routing: When a network supports asymmetric routing, attackers will frequently use multiple routes to gain access to the targeted device or network. This allows them to avoid detection by routing a large portion of suspicious packets around specific network segments and network intrusion systems.
Buffer Overwriting: By overwriting specific sections of computer memory on a network device, attackers can replace normal data with a slew of commands that can later be used as part of a network intrusion.
Traffic Flooding: By generating traffic loads that are too large for systems to adequately screen, attackers can cause chaos and congestion in network environments, allowing them to carry out attacks undetected.
Trojan Horse Malware: Trojan Horse viruses create network backdoors that allow attackers to easily access systems and data. Trojans do not reproduce by infecting other files, nor do they replicate themselves. Trojans can be spread through online archives and file repositories, and they are frequently spread through peer-to-peer file exchanges.
Worms: Worms are viruses that spread through email attachments or instant messaging. Worms consume a large number of network resources, preventing authorized activity. Some worms are specifically designed to steal confidential information, such as financial information.
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