I'm a server n00b, running a website off a Windows 2012 r2 server. My website has slowed to a crawl, so I started looking through some log files in C:\inetpub\logs\LogFiles and I started seeing a bunch of this:
2018-03-05 05:21:34 MyIPAddress GET /Dates.aspx U=878 80 - 162.158.79.99 Mozilla/5.0+(compatible;+bingbot/2.0;++http://www.bing.com/bingbot.htm) - 200 0 1236 86200
2018-03-05 05:25:50 MyIPAddress GET /Dates.aspx U=895 80 - 172.69.70.69 Mozilla/5.0+(compatible;+Googlebot/2.1;++http://www.google.com/bot.html) - 200 0 1236 85069
2018-03-05 05:27:17 MyIPAddress GET /robots.txt - 80 - 141.101.97.124 Mozilla/5.0+(compatible;+SeznamBot/3.2;++http://napoveda.seznam.cz/en/seznambot-intro/) - 404 0 2 657
2018-03-05 05:27:36 MyIPAddress GET /ImageCSharpThumb.aspx FileName=855_20180206121628_2012-09-02+KS+Knuckleheads.jpg 80 - 172.68.215.128 Mozilla/5.0+(compatible;+SeznamBot/3.2;++http://napoveda.seznam.cz/en/seznambot-intro/) - 200 0 0 666
2018-03-05 05:28:35 MyIPAddress GET /Dates.aspx U=269 80 - 141.101.97.121 Mozilla/5.0+(compatible;+SeznamBot/3.2;++http://napoveda.seznam.cz/en/seznambot-intro/) - 200 0 64 45704
2018-03-05 05:37:47 MyIPAddress GET /robots.txt - 80 - 172.69.70.213 Mozilla/5.0+(compatible;+Googlebot/2.1;++http://www.google.com/bot.html) - 404 0 2 2460
2018-03-05 05:37:51 MyIPAddress GET /ads.txt - 80 - 172.69.69.80 Mozilla/5.0+(compatible;+Googlebot/2.1;++http://www.google.com/bot.html) - 404 0 2 503
2018-03-05 05:38:03 MyIPAddress GET /favicon.ico - 80 - 108.162.215.128 Mozilla/5.0+(Macintosh;+Intel+Mac+OS+X+10_7_0)+AppleWebKit/535.11+(KHTML,+like+Gecko)+Chrome/17.0.963.56+Safari/535.11 - 304 0 0 6620
2018-03-05 05:38:20 MyIPAddress GET /ogPipe.aspx name=http://www.dongtaiwang.com/ 80 - 172.68.211.224 Mozilla/5.0+(Windows+NT+6.1)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/55.0.2883.87+Safari/537.36 - 404 0 1236 10958
Can someone tell me what the hackers are trying to do, and if there's any way to defend it? My server is completely unusable, my IP told me whatever is going on is using 100% of my allotted upload bandwidth.