Compiled from the monthly scans by the firm's anti-malware solution and virus protection software, the list indicates one particularly unpleasant worm.

The Conficker worm has reappeared in the list of the top ten threats and Sunbelt believes this is due to football fans visiting untrusted websites in search of the live coverage of Fifa World Cup matches.

"With many of the World Cup matches taking place during work hours when users have no access to a TV, the temptation to seek out online streaming services, be they from trusted or untrusted sources, has been too strong for some users," said Sunbelt Software research centre manager Tom Kelchner.

Maintaining the top spot on the list is password-stealing Trojan.Win32.Generic!BT, which now accounts for 27.16 per cent of all infections.

Equifax external affairs director Neil Munroe advised firms last month that cutting IT security budgets would prove to be a false economy, as the number of threats on the web is increasing.