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Have you seen this user-agent string?
In my web server logs, there appear to be a particular user-agent coming from hundreds of different IPs, with requests always being ("GET / HTTP/1.1"), and referrers being empty. A quick search for some of the IPs on google turns out that they are on various spam blocklists. I am thinking that maybe this is a botnet visiting people's websites? I wonder if anyone else noticed this.
Here's the "exact" user-agent string I'm referring to:
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)
Comments
Maybe HTTPTrack where you can download websites?
Looks just like the standard Internet Explorer 9 (Trident/5.0) running on Windows 7 (NT 6.1) running in compatibility mode (MSIE 7.0). This could be from any IE based browser (or .net application - sends the same user agent).
Is the IP within an ISP subnet?
No, they are from all over the world. Here's an exerpt of the log from last few days, with only the user-agent in question:
Probably a Windows based botnet. The fact it's using IE9 indicates that updates likely haven't been installed in a while.