Activision Blizzard's Call of Duty: Modern Warfare 2, a first-person shooting game, is reportedly encountering security concerns. Hackers have released a virus worm that is fast spreading in online lobbies, posing a serious threat to gamers. On June 26, a concerned player posted a warning on a Steam forum, advising others to be cautious and use antivirus software to protect their systems.

According to a report by TechCrunch, the virus linked to the attack may be located on the VirusTotal internet repository. Based on particular text sequences found within the malware's code, another player who analysed the dangerous program on the forum discussion classified it as a worm.

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An industry insider in the gaming sector later confirmed the existence of these suspicious sequences, which point to the presence of malware. The insider confirmed that the malware exhibited worm-like behaviour but decided to remain nameless owing to press constraints.

Activision strangely recognised the problem. Activision's Neil Wood referred to a tweet from the 'Call of Duty Updates' account on Thursday, claiming that the multiplayer for the 2009 game on Steam had been pulled offline for investigation purposes.

The reason behind the hackers' acts remains unknown. The malware's worm-like features are especially concerning because it may automatically spread from one infected gamer to another via online lobbies.

"This means the hackers must have discovered and are exploiting one or more bugs in the game to execute malicious code on the computers of the other players," according to the report.

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The incident has caused the gaming community to worry about the security of older games and the possible dangers of playing online. To prevent malware infections, users are advised to use care, stay away from dubious links and files, and keep their antivirus software up to date.