Dynamic heuristic method for detecting computer viruses

G - Physics – 06 – F

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G06F 11/00 (2006.01) G06F 21/00 (2006.01)

Patent

CA 2304163

A dynamic heuristic method for detecting computer viruses comprising three phases: a decryption phase, an exploration phase, and an evaluation phase. A purpose of the decryption phase is to emulate a sufficient number of instructions to allow an encrypted virus to decrypt its viral body. A purpose of the exploration phase is to emulate at least once all sections of code within a region deemed likely to contain any virus present in the target program. A purpose of the evaluation phase is to analyze any suspicious behavior observed during the decryption and exploration phases to determine whether the target appears to be infected.

L'invention concerne une méthode heuristique dynamique permettant de détecter les virus informatiques, cette méthode se déroulant en trois phases: une phase de décryptage, une phase d'exploration, et une phase d'évaluation. La phase de décryptage a pour but l'émulation d'un nombre d'instructions suffisant pour permettre à un virus crypté de décrypter le corps du virus. La phase d'exploration consiste à émuler au moins une fois toutes les sections d'un code à l'intérieur d'une région susceptible de renfermer un virus présent dans le programme objet. Quant à la phase d'évaluation, elle permet d'analyser tout comportement suspect observé pendant les phase de décryptage et d'exploration, afin de déterminer si ledit programme objet est infecté ou non.

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