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Trend Micro OfficeScan 10 Service Pack 1 Administrator’s Guide 5-66 • Ask When Necessary: Prompts users to allow or deny processes that may have violated Behavior Monitoring policies Note: A prompt asking users to allow or deny the process and add to the Allowed Programs or Blocked Programs appears. If the user does not respond within the time period specified in the Behavior Monitoring Settings screen, OfficeScan automatically allows the process to continue. • Deny: Always block processes associated with an event and record this action in the logs Refer to Table 5-38 for information on the different policies. TABLE 5-38. Event monitoring rules EVENTS DESCRIPTION Duplicated System File Hosts File Modification System File Modification Many malicious programs create copies of themselves or other malicious programs using file names used by Windows system files. This is typically done to override or replace system files, avoid detection, or discourage users from deleting the malicious files. The Hosts file matches domain names with IP addresses. Many malicious programs modify the Hosts file so that the Web browser is redirected to infected, non-existent, or fake Web sites. Certain Windows system files determine system behavior, including startup programs and screen saver settings. Many malicious programs modify system files to launch automatically at startup and control system behavior. DEFAULT ACTION Assess Assess Assess
TABLE 5-38. Event monitoring rules (Continued) EVENTS DESCRIPTION New Internet Explorer Plugin Layered Service Provider Internet Explorer Setting Modification Security Policy Modification Firewall Policy Modification Program Library Injection Protecting Computers from Security Risks Spyware/grayware programs often install unwanted Internet Explorer plugins, including toolbars and Browser Helper Objects. A Layered Service Provider (LSP) can manipulate inbound and outbound network traffic. Malicious programs can use LSPs to intercept network communication and gain network access. Many virus/malware change Internet Explorer settings, including the home page, trusted Web sites, proxy server settings, and menu extensions. Modifications in Windows Security Policy can allow unwanted applications to run and change system settings. The Windows Firewall policy determines the applications that have access to the network, the ports that are open for communication, and the IP addresses that can communicate with the computer. Many malicious programs modify the policy to allow themselves to access to the network and the Internet. Many malicious programs configure Windows so that all applications automatically load a program library (DLL). This allows the malicious routines in the DLL to run every time an application starts. DEFAULT ACTION Assess Assess Assess Assess Assess Assess 5-67
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