INTER-ARRIVAL TIME INTRUSION-DETECTION TECHNIQUE TO PROVIDE ENHANCED CYBERSECURITY

• US 20170222976A1
• Filed: 02/03/2016
• Published: 08/03/2017
• Est. Priority Date: 02/03/2016
• Status: Active Grant

• Current Assignee: Oracle International Corporation (Oracle Corporation)
• Original Assignee: Oracle International Corporation (Oracle Corporation)
• Inventors: Gross, Kenny C., Vaidyanathan, Kalyanaraman, Brownsword, Andrew E.
• Granted Patent: US 10,015,139 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 63/1416 Event detection, e.g. attack signature detection
• CPC Class Codes: H04L 63/1425 Traffic logging, e.g. anomaly detection
• CPC Class Codes: H04L 63/1466 Active attacks involving interception, injection, modification, spoofing of data unit addresses, e.g. hijacking, packet injection or TCP sequence number attacks

Abstract

The disclosed embodiments relate to a system that performs an intrusion-detection technique to differentiate between packets received from malicious remote users and legitimate local users in a networked computer system. During operation, the system determines arrival times for incoming packets at a node in the networked computer system. Next, the system determines inter-arrival times between the incoming packets from the arrival times. The system then determines a mean cumulative function (MCF) for the inter-arrival times by computing a cumulative sum of the inter-arrival times. Finally, upon detecting a change in a slope of the MCF, the system generates an alarm to indicate that a malicious remote user may be generating some of the incoming packets.

Claims

1. A method for performing an intrusion-detection technique to differentiate between packets received from malicious remote users and legitimate local users in a networked computer system, comprising:

determining arrival times for incoming packets at a node in the networked computer system;

determining inter-arrival times between the incoming packets from the arrival times;

determining a mean cumulative function (MCF) for the inter-arrival times by computing a cumulative sum of the inter-arrival times; and

upon detecting a change in a slope of the MCF, generating an alarm to indicate that a malicious remote user may be generating some of the incoming packets.

2. The method of claim 1, wherein detecting the change in the slope includes using Sen'"'"'s nonparametric slope estimation technique to compute the slope of the MCF.

3. The method of claim 1, wherein detecting the change in the slope includes using a Mann-Kendall test to detect a change point in the slope of the MCF.

4. The method of claim 1, wherein detecting the change in the slope includes using a fast Mann-Kendall computation to detect a change point in the slope of the MCF, wherein the fast Mann-Kendall computation inserts data points into a balanced search tree to improve performance of the Mann-Kendall computation.

5. The method of claim 1, wherein prior to determining the inter-arrival times, the method further comprises filtering the incoming packets based upon at least one filtering criterion to generate a set of filtered incoming packets to be used in determining the inter-arrival times.

6. The method of claim 1, wherein the method further comprises estimating a number of network hops traversed by packets originating from the malicious remote user based on a magnitude of the change in slope.

7. The method of claim 1, wherein determining the arrival times for the incoming packets includes obtaining the arrival times for the incoming packets from timestamps generated by a packet-capturing tool located at the node in the networked computer system.

8. The method of claim 1, wherein generating the alarm includes sending the alarm to a system administrator to enable the system administrator to verify whether a malicious remote user has compromised the network computer system by using a spoofed credential.

9. A non-transitory computer-readable storage medium storing instructions that when executed by a computer cause the computer to perform a method for performing an intrusion-detection technique to differentiate between packets received from malicious remote users and legitimate local users in a networked computer system, the method comprising:

determining arrival times for incoming packets at a node in the networked computer system;

determining inter-arrival times between the incoming packets from the arrival times;

determining a mean cumulative function (MCF) for the inter-arrival times by computing a cumulative sum of the inter-arrival times; and

upon detecting a change in a slope of the MCF, generating an alarm to indicate that a malicious remote user may be generating some of the incoming packets.

10. The non-transitory computer-readable storage medium of claim 9, wherein detecting the change in the slope includes using Sen'"'"'s nonparametric slope estimation technique to compute the slope of the MCF.

11. The non-transitory computer-readable storage medium of claim 9, wherein detecting the change in the slope includes using a Mann-Kendall test to detect a change point in the slope of the MCF.

12. The non-transitory computer-readable storage medium of claim 9, wherein detecting the change in the slope includes using a fast Mann-Kendall computation to detect a change point in the slope of the MCF, wherein the fast Mann-Kendall computation inserts data points into a balanced search tree to improve performance of the Mann-Kendall computation.

13. The non-transitory computer-readable storage medium of claim 9, wherein prior to determining the inter-arrival times, the method further comprises filtering the incoming packets based upon at least one filtering criterion to generate a set of filtered incoming packets to be used in determining the inter-arrival times.

14. The non-transitory computer-readable storage medium of claim 9, wherein the method further comprises estimating a number of network hops traversed by packets originating from the malicious remote user based on a magnitude of the change in slope.

15. The non-transitory computer-readable storage medium of claim 9, wherein determining the arrival times for the incoming packets includes obtaining the arrival times for the incoming packets from timestamps generated by a packet-capturing tool located at the node in the networked computer system.

16. The non-transitory computer-readable storage medium of claim 9, wherein generating the alarm includes sending the alarm to a system administrator to enable the system administrator to verify whether a malicious remote user has compromised the network computer system by using a spoofed credential.

17. A system that performs an intrusion-detection technique to differentiate between packets received from malicious remote users and legitimate local users in a networked computer system, comprising:

an intrusion-detection mechanism that operates in the networked computer system;

wherein during operation, the intrusion-detection mechanism,

determines arrival times for incoming packets at a node in the networked computer system;

determines inter-arrival times between the incoming packets from the arrival times;

determines a mean cumulative function (MCF) for the inter-arrival times by computing a cumulative sum of the inter-arrival times; and

upon detecting a change in a slope of the MCF, generates an alarm to indicate that a malicious remote user may be generating some of the incoming packets.

18. The system of claim 17, wherein while detecting the change in the slope, the intrusion-detection mechanism uses Sen'"'"'s nonparametric slope estimation technique to compute the slope of the MCF.

19. The system of claim 17, wherein while detecting the change in the slope, the intrusion-detection mechanism uses a Mann-Kendall test to detect a change point in the slope of the MCF.

20. The system of claim 17, wherein prior to determining the inter-arrival times, the instruction-detection mechanism filters the incoming packets based upon at least one filtering criterion to generate a set of filtered incoming packets to be used in determining the inter-arrival times.