Millions of phishing emails are bombarding UK firms from one source, according to security experts.
BlackSpider Technologies says a single botnet controls more than 20,000 distinct IP addresses.
The botnet began sending out phishing emails on Sunday, with subject lines invariable referring to either NatWest or Bank of Scotland. Within 24 hours more than 8.1 million emails were sent, according to BlackSpider.
James Kay, CTO of BlackSpider Technologies, told vnunet.com: "In security terms, phishing attacks are nothing new. What we're not used to seeing, however, is such a high volume of phishing emails being directed by one source.
"Given the sheer number of emails involved in this attack, a lot of people could end up being duped and out of pocket."
Meanwhile, research form SoftScan reveals that virus levels rose to 0.44 per cent in July from 0.36 per cent in June. Phishing represented the top virus group at 63.57 per cent.
In addition, spam accounted for nearly 90 per cent of the emails that the company scanned in July.
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