Specifications

Trend Micro™ OfficeScan™ 10 Administrator’s Guide
5-4
Network Virus
A virus spreading over a network is not, strictly speaking, a network virus. Only some
virus/malware types, such as worms, qualify as network viruses. Specifically, network
viruses use network protocols, such as TCP, FTP, UDP, HTTP, and email protocols to
replicate. They often do not alter system files or modify the boot sectors of hard disks.
Instead, network viruses infect the memory of client computers, forcing them to flood
the network with traffic, which can cause slowdowns and even complete network failure.
Because network viruses remain in memory, they are often undetectable by conventional
file I/O based scanning methods.
The OfficeScan firewall works with the Common Firewall Pattern to identify and block
network viruses. See About the OfficeScan Firewall on page 7-2 for details.
Others
"Others" include viruses/malware not categorized under any of the virus/malware
types.
Spyware and Grayware
Spyware and grayware refer to applications or files not classified as viruses or Trojans,
but can still negatively affect the performance of the computers on the network.
Spyware and grayware introduce significant security, confidentiality, and legal risks to an
organization. Spyware/Grayware often performs a variety of undesired and threatening
actions such as irritating users with pop-up windows, logging user keystrokes, and
exposing computer vulnerabilities to attack.
OfficeScan protects computers from the following spyware/grayware types:
Spyware
Spyware gathers data, such as account user names, passwords, credit card numbers, and
other confidential information, and transmits it to third parties.
Adware
Adware displays advertisements and gathers data, such as Web surfing preferences, used
for targeting future advertising at the user.