It is alleged that M00p have targeted businesses and spread a lot of malware via e-mail. Police contend that the gang have written malware which avoids detection by anti-virus software, and that they have targeted UK businesses since at least 2005. The gang appear to have been assembling botnets - fleets of compromised machines under their control - in order to make illegal gains.
Graham Cluley, a senior technology consultant at internet security firm Sophos, said the arrests were a "great success" for British police. He said virus writers have become increasingly motivated by money and target valuable personal data such as credit card and bank details.