Block potentially malicious files with a Data Protection policy
Article ID: 178860
Updated On:
Products
Email Security.cloud
Issue/Introduction
How to create a data protection policy to block attachments that are potentially malicious.
Environment
Email Security.Cloud
Resolution
Learn how to create a policy in Symantec Email Security.cloud Data Protection to restrict commonly exploited filetypes by extension.
Create a policy to block files
- In the Symantec.cloud portal, navigate to Services > Data Protection.
- Create a new Data Protection policy, and configure it as follows:
- Name: Restricted file files.
- Apply to: Inbound email only. Other options are available, which depend on the scope you desire.
- Execute if: All rules are met.
- Action: Redirect to Administrator. Other actions are available, which depend on the result you intend.
- Administrator email: Configure a non-production administrator email address. This must be non-production address because Data Protection policy administrators are automatically whitelisted from all Data Protection policies to avoid mail loops.
- Notifications: None.
- Add a new Rule, and configure it as follows:
- Name: Restricted files.
- Set it to: ANY conditions are met.
- Add a new condition, Attachment Filename List.
- Click Create a new filename List.
- Name: Potential Malicious files.
The following entries are typical files blocked by Outlook 2010, but you can add more or remove some of the extensions as per your needs:
Access Project Extension (Microsoft) *.ade Access Project (Microsoft) *.adp Executable Application *.app Active Server Page *.asp BASIC Source Code *.bas Batch Processing *.bat Internet Security Certificate File *.cer Compiled HTML Help *.chm DOS CP/M Command File, Command File for Windows NT *.cmd Command *.com Windows Control Panel Extension (Microsoft) *.cpl Certificate File *.crt csh Script *.csh DER Encoded X509 Certificate File *.der Executable File *.exe FoxPro Compiled Source (Microsoft) *.fxp Windows Help File *.hlp Hypertext Application *.hta Information or Setup File *.inf IIS Internet Communications Settings (Microsoft) *.ins IIS Internet Service Provider Settings (Microsoft) *.isp Internet Document Set, International Translation *.its JavaScript Source Code *.js JScript Encoded Script File *.jse UNIX Shell Script *.ksh Windows Shortcut File *.lnk Access Module Shortcut (Microsoft) *.mad Access (Microsoft) *.maf Access Diagram Shortcut (Microsoft) *.mag Access Macro Shortcut (Microsoft) *.mam Access Query Shortcut (Microsoft) *.maq Access Report Shortcut (Microsoft) *.mar Access Stored Procedures (Microsoft) *.mas Access Table Shortcut (Microsoft) *.mat Media Attachment Unit *.mau Access View Shortcut (Microsoft) *.mav Access Data Access Page (Microsoft) *.maw Access Add-in (Microsoft), MDA Access 2 Workgroup (Microsoft) *.mda Access Application (Microsoft), MDB Access Database (Microsoft) *.mdb Access MDE Database File (Microsoft) *.mde Access Add-in Data (Microsoft) *.mdt Access Workgroup Information (Microsoft) *.mdw Access Wizard Template (Microsoft) *.mdz Microsoft Management Console Snap-in Control File (Microsoft) *.msc Windows PowerShell *.msh Windows PowerShell *.msh1 Windows PowerShell *.msh2 Windows PowerShell *.mshxml Windows PowerShell *.msh1xml Windows PowerShell *.msh2xml Windows Installer File (Microsoft) *.msi Windows Installer Patch *.msp Windows SDK Setup Transform Script *.mst Office Profile Settings File *.ops Visual Test (Microsoft) *.pcd Windows Program Information File (Microsoft) *.pif Developer Studio Build Log *.plg Outlook Profile file *.prf Program File *.prg Windows PowerShell *.ps1 Windows PowerShell *.ps1xml Windows PowerShell *.ps2 Windows PowerShell *.ps2xml Windows PowerShell *.psc1 Windows PowerShell *.psc2 MS Exchange Address Book File, Outlook Personal Folder File (Microsoft) *.pst Registration Information/Key for W95/98, Registry Data File *.reg Windows Explorer Command *.scf Windows Screen Saver *.scr Windows Script Component, Foxpro Screen (Microsoft) *.sct Windows Shortcut into a Document *.shb Shell Scrap Object File *.shs Temporary File/Folder *.tmp Internet Location *.url VBScript File or Any VisualBasic Source *.vb VBScript Encoded Script File *.vbe VBScript Script File, Visual Basic for Applications Script *.vbs Visual Studio .NET Binary-based Macro Project (Microsoft) *.vsmacros Visio Workspace File (Microsoft) *.vsw Windows Script File *.ws Windows Script Component *.wsc Windows Script File *.wsf Windows Script Host Settings File *.wsh Exchange Public Folder Shortcut *.xnk Windows Help contents file *.cnt Windows Gadget *.gadget Windows program group file *.grp Help project file *.hpj JAVA archive file *.jar Manifest configuration file *.mcf Open software description file *.osd Perl script file *.pl Visual Basic project file *.vbp XAML browser application *.xbap ClickOnce Deployment Manifest File *.application ClickOnce Application Reference File *.appref-ms Active Server Page Extended *.aspx ASF Redirector File *.asx Borland Graphics Interface *.bgi Windows Cabinet File *.cab Microsoft Diagnostics Cabinet File *.diagcab HTML Component File *.htc Optical Disk Media File System *.iso Java Network Launching Protocol *.jnlp Windows Update File *.msu Printer backup File *.printerexport Windows PowerShell *.psd1 Windows PowerShell *.psdm1 Python Script *.py Python Script *.pyc Python Script *.pyo Python Script *.pyw Python Script *.pyz Python Script *.pyzw Desktop Theme File Settings *.theme Virtual Hard Disk *.vhd Virtual Hard Disk Extended *.vhdx Internet Printing File *.webpnp Pinned Site Shortcut from Internet Explorer *.website Excel Addin *.xll
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- Click Save.
- Condition options:
- Attachment filename: matches any of the filenames in the selected lists.
Note: This section is optional; you can implement this policy if you have a source which needs to send you these types of files. We will only add a Sender Domain list as an example, but you can add or use a Sender Group where you list email addresses instead. Data Protection happens after the antivirus scan. If files are detected as malicious, they'll be blocked by the Antivirus service.
- Add a new Rule, and configure it as follows:
- Name: Valid file senders.
- Set it to: ANY conditions are met.
- Add a new condition, Sender Domain List.
- Click Create a new Domain List.
- Name: Approved file senders.
- In this list we’ll add source domains deemed valid for the file restrictions above.
- example.com
- example.com
- Click Save.
- Condition options:
- Domain of the sender: is in none of the selected lists.
- Domain of the sender: is in none of the selected lists.
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