is a trojan component of Win32/Sirefef - a multi-component family of malware that moderates an affected user's Internet experience by modifying search results, and generates pay-per-click advertising revenue for its controllers. The family consists of multiple parts that perform different functions, such as downloading updates and additional components, hiding existing components, or executing payload routines.
is installed by other malware and may be present as a file named "wpbt0.dll". The trojan component is responsible for downloading other malicious components.
In the wild, we have observed some variants of Trojan:Win32/Sirefef.P present with other malware including those that are detected as Win32/Vobfus and Win32/Cycbot.
Analysis by Jireh Sanico
Alerts from your security software may be the only symptom.