What is "pum.bad.proxy"

PUM.bad.proxy is a form of malware known as a "registry hack", an unauthorized alteration to the Windows Registry file that specifically redirects LAN settings within Internet Explorer, the popular web browser commonly installed as the default web browser for Microsoft Windows. First spotted by users of Malwarebytes' Anti-Malware security software on 22 January 2011, it was reported to Malwarebytes Software over 200 times the first day alone.