The common.h file is an essential part of a particular parasite and therefore is responsible for the pest's malicious activity. Exact purposes of common.h depend on the related parasite's type and carried payload. Some threats can use common.h to serve annoying pop-up advertisements or store certain configuration settings, while others need it to corrupt files, steal user confidential information or run a spreading routine. In any case, DO NOT open this file!
The common.h file is installed and used by keylogger
Hooker Trojan Keylogger. It is also related to other parasites such as
BO Unix 1.2.1 and
BoScript. These threats can use common.h for different purposes, as the file's functionality depends on a particular parasite it belongs to.
Please note that the common.h file actually may be a fully legitimate part of the operating system or legitimate software. Often parasites use files with unsuspicious names, but malicious functionality. You should always carefully check the file before deleting it. It may not be related with malware, but can be required by your essential programs to work properly.
Malware statistics of August 2008 by Kaspersky Security Network
