MS05-020: Trojan.Helemoo exploits IE on unpatched systems
This new Trojan Horse takes advantage of an IE vulnerability patched by Microsoft during April 2005.
MS05-020: Trojan.Helemoo - Symantec Description
Trojan.Helemoo is a back door Trojan that exploits the Microsoft Internet Explorer DHTML Object Race Condition Memory Corruption Vulnerability (described in Microsoft Security Bulletin MS05-020).