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Sophos doesnt detect a virus that was previusly detected

Hello, my problem is with the Dexon virus. 6 months ago Sophos detected the Dexon in our servers. It could not be deleted by Sophos, so we have to delete some registries and some folders and it was solved. But now, we have noticed that others servers have the virus because the processes and files and folders that they have, but this time Sophos didn’t detect or report anything. Any clue about what could be wrong?

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