Trojan-PSW.VBS.Half

Parent class: TrojWare

Trojans are malicious programs that perform actions which are not authorized by the user: they delete, block, modify or copy data, and they disrupt the performance of computers or computer networks. Unlike viruses and worms, the threats that fall into this category are unable to make copies of themselves or self-replicate. Trojans are classified according to the type of action they perform on an infected computer.

Class: Trojan-PSW

Trojan-PSW programs are designed to steal user account information such as logins and passwords from infected computers. PSW is an acronym of Password Stealing Ware. When launched, a PSW Trojan searches system files which store a range of confidential data or the registry. If such data is found, the Trojan sends it to its “master.” Email, FTP, the web (including data in a request), or other methods may be used to transit the stolen data. Some such Trojans also steal registration information for certain software programs.

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Platform: VBS

Visual Basic Scripting Edition (VBScript) is a scripting language interpreted by Windows Script Host. VBScript is widely used to create scripts on Microsoft Windows operating systems.

Description

Technical Details

This Trojan steals user passwords. It is a VBScript virus. The file is 977 bytes in size. The Trojan can be found on webpages. It steals passwords from Win9x systems.

Payload

Once a page containing malicious code has been opened, the Trojan will search directories on the C: drive for files with a *.pwl extension. (These files are used in Win9x systems to store user passwords).

It then uses an ActiveXObject “MSMAPI.MAPISession” to send the passwords to the remote malicious user’s email address (onehalf***4@mail.ru). The message will have the following subject:

and contains the following text:

Removal instructions

1. Delete the html page containing malicious code.
2. Update your antivirus databases and perform a full scan of the computer (download a trial version of Kaspersky Anti-Virus).

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