IPS50SL06.ppt - Lesson 6 Working with Signatures and Alerts...

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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—6-1 Lesson 6 Working with Signatures and Alerts
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—6-2 Cisco IPS Signatures, Engines, and Alerts
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—6-3 Signature Types A Cisco IPS signature is a set of rules that your sensor uses to detect typical intrusive activity. The sensor supports three types of signatures: Built-in signatures: known attack signatures that are included in the sensor software Tuned signatures: built-in signatures that you modify Custom signatures: new signatures that you create
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—6-4 Signature Features Response actions Alert summarization Threshold configuration Anti-evasive techniques Fidelity ratings Application firewall SNMP support IPv6 support A blend of detection technologies Regular expression string pattern matching
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—6-5 Signature Actions Cisco IDS signatures can take one or all of the following actions when triggered: Drop malicious packets, including the trigger packet, before they reach their targets (for inline sensors only) Produce an alert or an alert that includes an encoded dump of the trigger packet Log IP packets that contain the attacker address, the victim address, or both Initiate the blocking of a connection or a specific host address Send a request to the notification application component of the sensor to perform SNMP notification Terminate the TCP session between the source of an attack and the target host
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—6-6 Regular Expressions Syntax Features of regular expressions syntax: Enables you to configure your sensor to detect textual patterns in the traffic it analyzes Allows you to describe simple as well as complex textual patterns Consists of special characters such as the following: () | [abc]
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—6-7 Examples of Regex Patterns To Match Regular Expression Hacker or hacker [Hh]acker Either hot or cold hot|cold
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—6-8 Signature Engines
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