Imperva released its June Hacker Intelligence Initiative report, which presents an in-depth study of how a relatively small number of attack sources are responsible for the majority of comment spam traffic.
Since late 2012, a group of researchers from UC Santa Barbara and RWTH Aachen University has been working on finding out the relations that exist between the different actors in the spam ecosystem, in the hope of providing information about bottlenecks and critical points in the spamming pipeline that will aid anti-spam efforts.
Malicious attachments in April came disguised as e-greetings and notifications about faxes.
Alphanumeric CAPTCHAs - those more or less difficult-to-read combinations that are used by many online services to discern whether a user is human or a bot - have been in use for over 15 years now, but I've yet to meet a person who likes "solving" them.
In the first quarter of 2014 spammers started imitating messages from mobile applications.