Cisco Cisco Email Security Appliance C160 Mode D'Emploi

In the following example, a message is dropped if the attachment is not an .exe executable file type. 
However, the filter will not perform any action on the message if there is at least one attachment with 
the file type you want to filter out. For example, the following filter drops any message with an 
attachment that is not an 

 file type:

If a message has multiple attachments, the Email Security appliance does not drop the message if at least 
one of the attachments is an 

.exe

 file, even if the other attachments not 

.exe

 files. 

This 

drop-attachments-where-dictionary-match 

action strips attachments based on matches to 

dictionary terms. If the terms in the MIME parts considered to be an attachment match a dictionary term 
(and the user-defined threshold is met), the attachment is stripped from the email. The following example 
shows attachment drops if words in the “secret_words” dictionary are detected in the attachment. Note 
that the threshold for the matches is set to one: 

The 

attachment-protected

 filter tests whether any attachment in the message is password protected. 

You might use this filter on incoming mail to ensure that the attachments are scannable. According to 
this definition, a zip file containing one encrypted member along with unencrypted members will be 
considered protected. Similarly, PDF file that has no open password will not be considered protected, 
even though it may restrict copying or printing with a password. The following example shows protected 
attachments sent to a policy quarantine:

exe_check: if (attachment-filetype != "exe") {

                   drop();

               }

Data_Loss_Prevention: if (true) {

drop-attachments-where-dictionary-match("secret_words", 1);

}

quarantine_protected:

if attachment-protected 

{

quarantine("Policy");

}