From 17 january 2015
until 8 Februari 2015
the windows binary distributions of version 1.9.2
have been compromised and infected with a RAT (Remote Access Tool)
aka trojan virus
.It is therefor wise to run a virus scan on your system if you have downloaded the Windows binaries from SourceForge between those two dates!
More on this topic here: http://forum.bigbrotherbot.net/general-usage-support/b3-virus/