Symantec Corporation

Marc Dacier

Corrado Leita

Carey S Nachenberg

Fanglu Guo

Sandeep B Bhatkar

Susanta Kumar Nanda

Pierre-Antoine Vervier

Darren Shou

Olivier Thonnard

A method for learning aspects of messages in an industrial control system is provided. The method includes obtaining a plurality of messages. The method includes starting at a first message field, proceeding via recursion to each next message field, and identifying message values at that message field as constant when constant in messages in a group, as random when random in messages in a group, as length when expressive of a shared length of messages in a group, as opcode when correlated with a shared structure of messages in a group, and otherwise as parameter. The method includes subdividing message groups into subgroups according to the identified message values at that message field, with the recursion applied to each subgroup. A method and system for monitoring messages in an industrial control system is provided.

Heuristics-based protocol labeling for industrial control systems

A computer system monitors a set of inactive addresses. The computer system identifies a suspicious activity associated with at least one inactive address of the set of inactive addresses. The computer system determines a suspicion score for the at least one inactive address based on the suspicious activity associated with the at least one inactive address. The computer system categorizes the at least one inactive address as a potentially hijacked address if the suspicion score exceeds a threshold.

Detecting a hijacked network address

A computer-implemented method for performing Internet site security analyzes may include (1) identifying a plurality of clients, each client within the plurality of clients connecting to the Internet from a different Internet Protocol address, (2) identifying a plurality of Internet sites targeted for a security assessment, and then, for each Internet site within the plurality of Internet sites, (3) selecting at least one client from the plurality of clients to use as a proxy for communicating with the Internet site, (4) communicating with the Internet site, using the client as a proxy, to gather information for a security analysis of the Internet site, and (5) performing the security analysis of the Internet site based at least in part on the gathered information. Various other methods, systems, and computer-readable media are also disclosed.

Systems and methods for performing internet site security analyses

A computer-implemented method for neutralizing file-format-specific exploits contained within electronic communications may include (1) identifying an electronic communication, (2) identifying at least one file contained within the electronic communication, and then (3) neutralizing any file-format-specific exploits contained within the file. In one example, neutralizing any file-format-specific exploits contained within the file may include applying at least one file-format-conversion operation to the file. Additionally or alternatively, neutralizing any file-format-specific exploits contained within the file may include constructing a sterile version of the file that selectively omits at least a portion of any exploitable content contained within the file. Various other methods, systems, and computer-readable media are also disclosed.

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Mountain View, CA, United States of America

Marc Dacier