Virgin Media has been working with the Serious Organised Crime Agency (SOCA) to warn customers of the notorious SpyEye Trojan which collects banking information from infected computers.
SOCA identified around 1,500 connections infected with the threat based on anonymous IP monitoring, and informed Virgin Media after seeing the ISP's work in highlighting the risk from the Zeus Trojan in 2010.
Virgin Media checked the IP addresses against its database, and contacted the affected customers to inform them of the risks and the steps needed to remove the malware.
Jon James, executive director of broadband at Virgin Media, said that this sort of initiative is vital to protect against the growing volume of threats as access to the internet becomes ever more prevalent.
"With increasing numbers of people getting online, and a nation reliant on broadband, consumers are looking for more from their service providers to give them the confidence that their online world is safe," he said.
"Cyber crime is on the rise and the increasing sophistication of malware infections means that all internet users could be at risk with devastating effects."
Lee Miles, head of cyber at SOCA, welcomed the work Virgin Media is doing to help customers, but urged internet users to be proactive in stopping threats by protecting their devices.
"It is equally important for consumers to protect their finances and personal information by ensuring their computers are equipped with up-to-date security software," he said.
In June, the SpyEye malware was linked to attacks on customers of two German travel services, Air Berlin and AirPlus, after research by security firm Trusteer.
Cyber crime is estimated to cost the UK £27bn a year, according to a report by the Office of Cyber Security and Information Assurance.
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