Cyber criminals are using popular note-taking app Evernote as Command-and-Control Server to give commands to the malware installed on infected PCs. TrendMicro uncovered a malware detected as BKDR_VERNOT.A. Researchers also pointed out that the backdoor may have also used Evernotes as a location to upload stolen data. The malware can perform several backdoor commands such as downloading, executing, and renaming files. It then gathers information from the infected system, including details about its OS, timezone, user name, computer name, registered owner and organization.
Source: https://thehackernews.com/2013/03/hacker-uses-evernote-account-as-command.html