Chapter 7 Defining Signatures

Creating Custom Signatures

To create a custom signature based on the String XL TCP engine that searches for minimum match length with stingy, dot all, and UTF-8 turned on, follow these steps:

Step 1 Log in to the CLI using an account with administrator or operator privileges.

Step 2 Enter signature definition submode.

sensor# configure terminal

sensor(config)# service signature-definition sig1

Step 3 Specify a signature ID and subsignature ID for the signature.

sensor(config-sig)# signatures 60004 0

Custom signatures are in the range of 60000 to 65000.

Step 4 Enter signature description submode.

sensor(config-sig-sig)# sig-description

Step 5 Specify a name for the new signature. You can also specify a additional comments about the sig using the sig-commentcommand or additional information about the signature using the sig-string-infocommand.

sensor(config-sig-sig-sig)# sig-name This is my new name

Step 6 Exit signature description submode.

sensor(config-sig-sig-sig)# exit

Step 7 Specify the String XL TCP engine.

sensor(config-sig-sig)# engine string-xl-tcp

Step 8 Specify the service ports.

sensor(config-sig-sig-str)# service-ports 80

Step 9 Specify the direction.

sensor(config-sig-sig-str)# direction to-service

Step 10 Change the event actions if needed according to your security policy by using the event-actioncommand. The default event action is produce-alert.

Step 11 Make sure raw regex is turned off:

sensor(config-sig-sig-str)# specify-raw-regex-string no

Note Raw Regex is regular expression syntax used for raw mode processing. It is expert mode only and targeted for use by the Cisco IPS signature development team or only those who are under supervision by the Cisco IPS signature development team. You can configure a String XL signature in either regular Regex or raw Regex.

Step 12 Specify the regex string to search for in the TCP packet with dot all turned on.

sensor(config-sig-sig-str-no)# regex-string ht+p[\r]. sensor(config-sig-sig-str-no)# dot-all true

Step 13 Specify a minimum match length for this signature that can only be used with stingy.

sensor(config-sig-sig-str-no)# specify-min-match-length yes sensor(config-sig-sig-str-no-yes)# min-match-length 100

 

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Cisco Systems IPS4510K9 manual Specify a signature ID and subsignature ID for the signature
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IPS4510K9 specifications

Cisco Systems has long been a leading player in network security, and its IPS (Intrusion Prevention System) series is a testament to its commitment to safeguarding digital environments. Among its notable offerings are the IPS4510K9 and IPS4520K9 models, both designed to provide advanced threat protection for mid-sized to large enterprise networks.

The Cisco IPS4510K9 and IPS4520K9 are distinguished by their cutting-edge features that help organizations defend against a myriad of cyber threats. These systems utilize a multi-layered approach to security, integrating intrusion prevention, advanced malware protection, and comprehensive visibility across the network.

One of the primary characteristics of the IPS4510K9 is its high performance. It boasts a throughput of up to 1 Gbps, making it suitable for environments that demand rapid data processing and real-time responses to threats. The IPS4520K9, on the other hand, enhances that capability with improved throughput of up to 2 Gbps, accommodating larger enterprises with heavier network traffic. These models are equipped with powerful processors that support complex signature matching and can intelligently distinguish between legitimate traffic and potential threats.

In addition to performance, both models are designed with scalability in mind. They can be easily integrated into existing Cisco infrastructures. This facilitates a seamless enhancement of security without causing significant interruptions to ongoing operations. Moreover, they offer flexible deployment options, allowing organizations to operate them inline or out of band depending on their specific needs.

The Cisco IPS4510K9 and IPS4520K9 leverage advanced detection technologies, utilizing a variety of signature types and heuristic analysis to detect known and unknown threats effectively. They are equipped with real-time alerting and reporting capabilities, giving security teams immediate visibility into potential breaches and enabling them to respond swiftly.

Furthermore, both models support a range of management options through the Cisco Security Manager, allowing for centralized administration, streamlined policy management, and enhanced monitoring capabilities. Automated updates ensure the systems remain current with the latest threat intelligence, vital for staying ahead of evolving cyber threats.

In summary, the Cisco Systems IPS4510K9 and IPS4520K9 represent powerful solutions for organizations seeking robust intrusion prevention capabilities. With their high performance, scalability, and advanced detection technologies, these systems are essential tools in the ever-changing landscape of cybersecurity, providing enterprises with the peace of mind needed to operate securely in today's digital world.
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