CWmike writes "Attackers are already exploiting a bug in Internet Explorer 7 that Microsoft patched just last week, security researchers warned today. Although the attacks are currently in 'very, very small numbers,' they may be just the forerunner of a larger campaign, said Trend Micro's Jamz Yaneza. 'I see this as a proof-of-concept,' said Yaneza, who noted that the exploit's payload is extremely straightforward and explained that there has been no attempt to mask it by, say, planting a root kit on the victimized PC at the same time. 'I wouldn't be surprised to see this [exploit] show up in one of those Chinese exploit kits,' he added. The new attack code, which Trend Micro dubbed 'XML_Dloadr.a,' arrives in a spam message as a malicious file masquerading as a Microsoft Word document."