HI 
Im sure you heard this 2/4 weeks ago,Slovenian police and FBI arrested a person who created global virus called “Butterfly”
The botnet, one of the world’s largest, was dismantled earlier this year after infecting 12.7 million computers. It was designed to steal personal financial details and was also found in the PCs of banks and major companies.
Can Avast detect this virus?
Have a nice day 
Butterfly botnet’s wings clipped, after infecting 13m PCs
http://www.pcpro.co.uk/news/security/356023/butterfly-botnets-wings-clipped-after-infecting-13m-pcs
F-Secure Virus Descriptions : Butterfly
http://www.f-secure.com/v-descs/butter.shtml
Butterfly.302
http://www.symantec.com/security_response/writeup.jsp?docid=2001-032912-1418-99
http://www.symantec.com/business/security_response/writeup.jsp?docid=2009-093006-0442-99
Currently, W32.Pilleuz has been most commonly referred to as the Mariposa or Butterfly botnet.
VirusTotal result from mars 2010
http://www.virustotal.com/file-scan/report.html?id=25a964c07dd4b9ae514429afa87ae9dc780436d376d858e48094091229de5274-1269282267
so the answer is yes… ;)…if i have googled the correct one…