The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 07, 2015
Filed:
Sep. 01, 2010
Daniel Wyschogrod, Newton, MA (US);
David Patrick Mankins, Cambridge, MA (US);
Daniel Wyschogrod, Newton, MA (US);
David Patrick Mankins, Cambridge, MA (US);
Raytheon BBN Technologies Corp., Cambridge, MA (US);
Abstract
Systems and methods are disclosed for detecting covert DNS tunnels using n-grams. The majority of legitimate DNS requests originate from network content itself, for example, through hyperlinks in websites. So, comparing data from incoming network communications to a hostname included in a DNS request can give an indication on whether the DNS request is a legitimate request or associated with a covert DNS tunnel. This process can be made computationally efficient by extracting n-grams from incoming network content and storing the n-grams in an efficient data structure, such as a Bloom filter. The stored n-grams are compared with n-grams extracted from outgoing DNS requests. If n-grams from an outgoing DNS request are not found in the data structure, the domain associated with the DNS request is determined to be associated with a suspected covert DNS tunnel.