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Advanced Evasion Techniques – Bypassing IDS and IPS Systems

Intrusion Detection/Prevention Systems (IDS/IPS) are widely used to protect corporate networks from malicious attacks and malware. While these systems are quite effective in keeping most malicious traffic out, there are some advanced evasion techniques attackers can use to bypass even the most secure IDS/IPS systems.

Fragmentation Evasion

Fragmentation evasion is a technique attackers use to split malicious payloads into multiple smaller chunks or packets. These packets are then sent over the network separately, thus evading the IDS/IPS’s signature-matching engine. By splitting an attack in this manner, the system’s thresholds may not be reached and the attack can get through undetected.

TTL Manipulation

Time To Live (TTL) is an important Internet Protocol (IP) header field that determines how many routers a packet can pass through before being discarded. Attackers can manipulate the TTL values of their malicious packets to avoid being detected. If the packets are set to expire before they reach the destination, the IDS/IPS system won't have enough time to analyze them for malicious content.

Padding and Encoding

Padding and encoding are two techniques attackers can use to make malicious payloads less recognizable. By adding extra bytes to a packet or encoding the payload, the attacker can hide its real content from the IDS/IPS system. The padding and encoding of malicious content can also be used in conjunction with fragmentation evasion to further reduce the chances of being detected.

Conclusion

Advanced evasion techniques are a powerful tool used by attackers to bypass IDS/IPS systems and penetrate corporate networks. Organizations must stay on top of the methods used by attackers to ensure their networks remain secure.

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