How to use Application and Device Control (ADC) to limit the spread of a threat.
There is a threat in the environment that is not being mitigated by the Antivirus functionality on the Symantec Endpoint Protection client.
The Application and Device Control feature is installed on the clients and functioning normally.
A suspicious file has been identified as a threat.
The first step is to identify the MD5 hash of the threat. There are several ways to find this information.
The Endpoint Protection client comes with a utility called Checksum.exe. This utility will generate a file with MD5 hash value for a specified file.
Microsoft has a freely available utility called the File Checksum Integrity Verifier.
The utility is discussed in great detail in Microsoft's KB 841290.
SlavaSoft has a utility called HashCalc that is freely available for download on the Internet at http://www.slavasoft.com/hashcalc/.
You may submit a file to www.threatexpert.com and the generated report will contain the hash value. This report will be emailed to your chosen email address and made available on the site.
Some of the tools used to generate MD5 hashes are 32-bit applications and due to Windows file system redirection on 64-bit Operating Systems, some unexpected behavior will occur.
If an application (like notepad.exe) is present in C:\Windows\SysWOW64 and C:\Windows\System32 folders, both the files have different hash values and it is recommended to add both hash values to the policy.
Some MD5 Hash tools may provide the hash of the file from
C:\Windows\SysWOW64\ though the user requests hash for the file from C:\Windows\System32\ folder.
Symantec’s Checksum.exe tool generates/provides hash value for the exact file path requested.
C:\Windows\SysWOW64\notepad.exe will be provided if requested for
C:\Windows\SysWOW64\notepad.exe Hash of
C:\Windows\System32\notepad.exe will be provided if requested for
We would recommend to use Symantec’s checksum tool for generating the hash values.
Once the MD5 hash is known, the Application and Device Control policy can be configured to prevent that specific file from launching on the clients and beginning an active infection. The following steps demonstrate how to create a new Application and Device Control policy to block the specific threat and assign it to clients.
An article created in Symantec's Connect Forums illustrates how to Block Software By Fingerprint.
Microsoft KB 841290