Windows 2003/XP/2000/NT/ME/98/95

Agent.BRH is a backdoor that allows hackers to gain remote access to the affected computer in order to carry out actions that compromise user confidentiality and impede the tasks performed on the computer.

It reduces the security level of the computer: it opens one or more ports to allow remote access to the computer and takes action that compromises user confidentiality.

Agent.BRH accesses several websites to download files, which it then runs. These can be any type of file, although they are normally malware.

It uses stealth techniques to avoid being detected by the user:

• It injects itself in running processes.

Agent.BRH uses the following propagation or distribution methods:

• Exploiting vulnerabilities with the intervention of the user: exploiting vulnerabilities in file formats or applications. To exploit them successfully it needs the intervention of the user: opening files, viewing malicious web pages, reading emails, etc.
• Via Internet, exploiting remote vulnerabilities: attacking random IP addresses, in which it tries to insert a copy of itself by exploiting one or more vulnerabilities.

Agent.BRH is easy to recognize, as it shows the following symptoms:

• It creates shortcuts in the Windows Desktop.