According to V3.co.uk, researchers at MessageLabs are warning of a huge surge in incidents of the Bredolab Trojan, which could allow hackers to hijack an organization's PCs.
The Trojan is being sent out by the Cutwail botnet, and now makes up 3.5 percent of all spam and 5.6 percent of all malware intercepted each day. As many as 3.6 billion Bredolab malware e-mails may be in circulation globally each day in October, say researchers.
The Trojan comes in a zip file attachment to an unsolicited e-mail about postal tracking numbers.
"By nature, once this Trojan is on a system, it is unlikely to be detected and will allow the controller to do whatever they wish with the infected machine, such as installing other malware and spyware."