Roughly five years after it burst onto the malware scene, the notorious Grum spam botnet has been disconnected from the Internet. Grum has consistently been among the top three biggest sources of junk email, a crime machine capable of blasting 18 billion messages per day and responsible for sending about one-third of all spam.
An organized crime group thought to include individuals responsible for the notorious Storm and Waledac worms generated more than $150 million promoting rogue online pharmacies via spam and hacking, according to data obtained by KrebsOnSecurity.com.
Spam trackers are seeing a fairly dramatic drop in junk e-mail sent over the past few days, specifically spam relayed by the one of the world’s largest spam botnets – although security experts disagree on exactly which botnet may be throttling back or experiencing problems.
Security researchers have dealt a mighty blow to a spam botnet known as Pushdo, a massive grouping of hacked PCs that until recently was responsible for sending more than 10 percent of all e-mail worldwide.