Waledac, also known by its aliases Waled and Waledpak, was a botnet mostly involved in e-mail spam and malware.
[2][3] On February 25, 2010, Microsoft won a court order which resulted in the temporary cut-off of 277 domain names which were being used as command and control servers for the botnet, effectively crippling a large part of the botnet.
[5] Codenamed 'Operation b49', an investigation was conducted for some months which thereby yielded an end to the 'zombie' computers.
[6] In early September 2010, Microsoft was granted ownership of the 277 domains used by Waledac to broadcast spam email.
[7] The botnet was particularly active in North America and Europe and India, Japan and China.