I have a linux apache server which was running fine until a few days ago. What happened is from the access log there are lines like this, and the log file is growing by many lines every second. Initially I suspected the server was dos attacked and stopped the server. but after several days whenever I start the server, similar log happens. I'm wondering if anyone know what is happening? is it caused by a virus?
23.19.76.217 - - [17/Oct/2012:10:21:47 -0400] "GET http://ad.globe7.com/st?ad_type=iframe&ad_size=728x90§ion=3633732&pub_url=${PUB_URL} HTTP/1.0" 200 4497
142.54.177.114 - - [17/Oct/2012:10:21:47 -0400] "GET http://ad.globe7.com/imp?Z=300x250&s=3582878&T=3&_salt=3106601030&B=12&m=2&u=http%3A%2F%2Fwww.homesearchcar.com%2F%3Fp%3D184&r=1 HTTP/1.0" 302 -