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

Banbra.GUW is a Trojan, which although seemingly inoffensive, can actually carry out attacks and intrusions.

It captures certain information entered or saved by the user, with the corresponding threat to privacy: passwords saved by certain Windows services; keystrokes, in order to obtain information for accessing online banking services, passwords and other confidential information; email addresses.

It sends the gathered information to a remote user by any available means: email, FTP, etc.

• In the local network: it generates a large amount of network activity and consumes bandwidth.

• On remote sites: it mass mails junk mail (spam).

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

• It uses techniques included in its code to hide itself while it is active.

Banbra.GUW 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.
• Email: sending emails that include a copy of itself as an attachment. The computer is infected when the attachment is run.
• Instant messaging: it sends links pointing to a copy of itself to all users included in the infected user's contacts list.