ctblocker

Malicious spam (malspam) is by sent by botnets every day.  These malspam campaigns send malware designed to infect Windows computers.  I’ll see Dridex or Upatre/Dyre campaigns a daily basis.  Fortunately, most of these emails are blocked by our spam filters.  

https://isc.sans.edu/forums/diary/DalexisCTBLocker+malspam+campaign/19641/