The digital signature
cache file is used during Manual Scan, Scheduled Scan, and Scan
Now. Agents do not scan files whose signatures have been added
to the digital signature cache file.
The Security Agent
uses the same Digital Signature Pattern used for Behavior Monitoring to build the
digital signature cache file. The Digital Signature Pattern contains a list of files
that Trend Micro considers trustworthy and
therefore can be excluded from scans.
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NoteBehavior Monitoring is automatically disabled on Windows server platforms. If the
digital signature cache is enabled, Security Agents on these
platforms download the Digital Signature Pattern for
use in the cache and do not download the other
Behavior Monitoring components.
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Agents build the digital signature cache file according to a schedule, which is
configurable from the web console. Agents do this to:
-
Add the signatures of new files that were introduced to the system since the last cache file was built
-
Remove the signatures of files that have been modified or deleted from the system
During the cache building process, agents check the following folders for trustworthy
files and then adds the signatures of these files to the digital
signature cache file:
-
%PROGRAMFILES% -
%WINDIR%
The cache building process does not affect the endpoint's performance because agents
use minimal system resources during the process. Agents are also
able to resume a cache building task that was interrupted for
some reason (for example, when the host machine is powered off
or when a wireless endpoint's AC adapter is unplugged).