Symantec Security Response has been monitoring a recent spate of Web-based attacks and drive-by downloads from compromised websites that are infecting end-users’ computers. This latest round of attacks has a payload that maliciously alters Web search engine results on the compromised machines. There have also been some recent blog posts and articles written about compromised websites rendering drive-by downloads, including malware, with obfuscated attacks coming from a malicious Gumblar domain in China.