A mobile virus is a piece of malicious software that targets mobile phones or wireless-enabled PDAs. As wireless phone and PDA networks become more commonly used and more complex, it has become increasingly difficult to secure them against electronic attacks in the form of viruses or other malware.
Two types of malicious programs are known to affect mobile devices:
The first instance of a mobile virus occurred in June 2004 when it was discovered that a company called Ojam had engineered an anti-piracy Trojan virus in older versions of their mobile phone game Mosquito. This virus sent SMS text messages to the company without the users' knowledge. It was removed from the game's more recent versions, but it still exists in older, unlicensed versions. These older versions may still be distributed on file-sharing networks and free software download web sites.
In July 2004, computer hobbyists released a proof-of-concept mobile virus named Cabir. This virus replicates itself on Bluetooth wireless networks.
In March 2005, it was reported that a computer worm called Commwarrior-A had been infecting Symbian series 60 mobile phones. This specific worm replicates itself through the phone's Multimedia Messaging System (MMS). It sends copies of itself to other phone owners listed in the phone user's address book. Although the worm is not considered harmful, experts agree that it heralds a new age of electronic attacks on mobile phones.
In August 2010, Kaspersky Lab reported a trojan designated Trojan-SMS.AndroidOS.FakePlayer.a, the first malicious program classified as a Trojan-SMS, which affects smartphones running on Google’s Android operating system. It has already infected a number of mobile devices. It sends SMS messages to premium rate numbers without the owner’s knowledge or consent and can accumulate huge bills.
Currently, various antivirus software companies like Trend Micro, AVG, avast!, Kaspersky Lab, and Softwin are working to adapt their programs to the mobile operating systems that are most at risk, while operating system developers try to curb the spread of infections with quality control checks on software and content offered through their digital application distribution platforms, such as Google Play or Apple's App Store.
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