Squid - How to  make squid proxy prevent malwares

In this tutorial I will explain how to make squid prevent malwares in five easy steps:

Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. It reduces bandwidth and improves response times by caching and reusing frequently-requested web pages. Squid has extensive access controls and makes a great server accelerator.

Step 1:
Create a file called malware_block_list.txt and save in /etc/squid

Step 2:
Create a new access list (ACL) in your squid.conf
 

# File which contains the list 
                      acl malware_block_list url_regex-i "/etc/squid/malware_block_list.txt" 
                      # Access Denied 
                      http_access deny malware_block_list 
                      # Redirect message - (You can make your own) 
                      deny_info http://malware.hiperlinks.com.br/denied.shtml malware_block_list

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Step 3:
Execute in shell.
 

wget -O - http://malware.hiperlinks.com.br/cgi/submit?action=list_squid > /etc/squid/malware_block_list.txt

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Step 4:
Put in Scheduled Tasks (Crontab).
**In my case the file from the list of malware is updated at 00 hours and 06 hours.
 

* 00,06 * * * wget -O - http://malware.hiperlinks.com.br/cgi/submit?action=list_squid > /etc/squid/malware_block_list.txt

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Step 5:
Reload squid configuration.
 

service squid reload

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Every time that scheduled task is executed, the file is updated.
 
Open /etc/squid/malware_block_list.txt and see if you can see the list of urls, take one and put in your browser to see if the the error message appears.
Regards

André Bolinhas