Security experts uncovered a deeply entrenched strain of malware that spent years trolling government networks on a mission to steal sensitive data. The sophisticated cyber espionage bug -- dubbed Red October -- includes unique and unsettling features, such as the ability to recover deleted files and the ability to hide in plain sight on a user's hard drive. While Red October targeted a variety of documents, researchers say it included special instructions to search out files that designated the contents as encrypted.

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