Anti-virus specialist Sophos is warning users of a new worm, Cellery-A (W32/Cellery-A), which attempts to spread across networks by posing as a Tetris game.
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The Cellery worm makes changes to Windows settings to ensure that it automatically runs when the operating system starts up, Sophos warned. When the game is run, the worm plays a MIDI music tune, and searches for other network drives and attached computers to also try and infect.
"If your company has a culture of allowing games to be played in the office, your staff may believe this is simply a new game that has been installed - rather than something that should cause concern," warned Graham Cluley, senior technology consultant for Sophos.
Although there have only been a small number of reports of the Cellery worm, Sophos urged users ensure their anti-virus software was up to date.