Suspicious activity in IIS logs (Exchange 2003 Server)

I'm about to decommission an old Exchange 2003 Server and was going through the logs.
In the IIS logs, I found suspicious activity that appears to be port scanning.  

Can any one shed some light on this?  
Should I be taking any precautions before decommissioning this server (which needs to be online when doing so, although I disconnected it from the network at the moment)?  

#Software: Microsoft Internet Information Services 6.0
#Version: 1.0
#Date: 2017-12-27 00:49:47
#Fields: date time s-sitename s-ip cs-method cs-uri-stem cs-uri-query s-port cs-username c-ip cs(User-Agent) sc-status sc-substatus sc-win32-status 
2017-12-27 00:49:47 W3SVC1 10.1.1.24 GET /index.html - 80 - 5.189.164.176 masscan/1.0+(https://github.com/robertdavidgraham/masscan) 200 0 0
#Software: Microsoft Internet Information Services 6.0
#Version: 1.0
#Date: 2017-12-27 02:41:54
#Fields: date time s-sitename s-ip cs-method cs-uri-stem cs-uri-query s-port cs-username c-ip cs(User-Agent) sc-status sc-substatus sc-win32-status 
2017-12-27 02:41:54 W3SVC1 10.1.1.24 GET /index.html - 80 - 185.110.132.232 Scanbot 200 0 0
#Software: Microsoft Internet Information Services 6.0
#Version: 1.0
#Date: 2017-12-27 04:36:54
#Fields: date time s-sitename s-ip cs-method cs-uri-stem cs-uri-query s-port cs-username c-ip cs(User-Agent) sc-status sc-substatus sc-win32-status 
2017-12-27 04:36:54 W3SVC1 10.1.1.24 GET /xmlrpc.php - 80 - 185.188.207.6 curl/7.35.0 404 0 2
#Software: Microsoft Internet Information Services 6.0
#Version: 1.0
#Date: 2017-12-27 10:01:27
#Fields: date time s-sitename s-ip cs-method cs-uri-stem cs-uri-query s-port cs-username c-ip cs(User-Agent) sc-status sc-substatus sc-win32-status 
2017-12-27 10:01:27 W3SVC1 10.1.1.24 GET /index.html - 80 - 222.191.251.124 User-Agent:Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.2;+.NET+CLR+1.0.3705 200 0 0
2017-12-27 10:01:27 W3SVC1 10.1.1.24 GET /index.action - 80 - 222.191.251.124 Mozilla/5.0+(Macintosh;+Intel+Mac+OS+X+10_12_3)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/56.0.2924.87+Safari/537.36 404 0 2
#Software: Microsoft Internet Information Services 6.0
#Version: 1.0
#Date: 2017-12-27 10:38:22
#Fields: date time s-sitename s-ip cs-method cs-uri-stem cs-uri-query s-port cs-username c-ip cs(User-Agent) sc-status sc-substatus sc-win32-status 
2017-12-27 10:38:22 W3SVC1 10.1.1.24 GET /index.html - 80 - 209.126.136.4 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/57.0.2987.133+Safari/537.36 200 0 0
2017-12-27 10:52:08 W3SVC1 10.1.1.24 GET /index.html - 80 - 158.85.81.121 - 200 0 0
#Software: Microsoft Internet Information Services 6.0
#Version: 1.0
#Date: 2017-12-27 13:02:31
#Fields: date time s-sitename s-ip cs-method cs-uri-stem cs-uri-query s-port cs-username c-ip cs(User-Agent) sc-status sc-substatus sc-win32-status 
2017-12-27 13:02:31 W3SVC1 10.1.1.24 GET /index.html - 80 - 222.186.46.16 User-Agent:Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.2;+.NET+CLR+1.0.3705 200 0 0
2017-12-27 13:02:31 W3SVC1 10.1.1.24 GET /index.action - 80 - 222.186.46.16 Mozilla/5.0+(Macintosh;+Intel+Mac+OS+X+10_12_3)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/56.0.2924.87+Safari/537.36 404 0 2
#Software: Microsoft Internet Information Services 6.0
#Version: 1.0
#Date: 2017-12-27 15:50:58
#Fields: date time s-sitename s-ip cs-method cs-uri-stem cs-uri-query s-port cs-username c-ip cs(User-Agent) sc-status sc-substatus sc-win32-status 
2017-12-27 15:50:58 W3SVC1 10.1.1.24 GET /index.html - 80 - 164.132.91.1 Gecko/20100916+Iceape/2.0.8 200 0 0

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JAMAsked:
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Dan McFaddenSystems EngineerCommented:
It's nothing.  I could post thousands of more nefarious http logs entries from the sites that I operate.  Since these all appear to be just a request for an index page or a specific PHP page, I wouldn't lose any sleep over it.

Also, since you are decommissioning the server, it makes little sense to try to mitigate the one-off requests.  On my sites, I regularly see single IPs running a scan of 300 or 400 specific URLs.  They are testing to see what technology is running on the backend and if they get a positive hit, the scan will dive deeper to check to see if known vulnerabilities are visible.

If you so desire, you could block the IP Addresses ID'ed from the logs.  Blocking them at the firewall or the router would work.  Depending on the Server OS of this box, you could block the IPs directly in IIS.  Though blocking them further up the network (at the FW or Router) would be best.

But this is a perfect example of why SysAdmins should always analyze ftp and http logs of the sites they manage.  And a use-case for frequent updates to the OS as well as the applications being supported by IIS.

Dan

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JAMAuthor Commented:
That's a relief, thanks!
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