Trojan-PSW.Win32.Kesk

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: Win32

Win32 is an API on Windows NT-based operating systems (Windows XP, Windows 7, etc.) that supports execution of 32-bit applications. One of the most widespread programming platforms in the world.

Description

Technical Details

This Trojan is designed to steal user passwords. It is a Windows PE EXE file. It is 9,728 bytes in size. It is not packed in any way.

Installation

This Trojan will be installed to the victim machine by other malicious programs.

When launched, the Trojan requires the system library svrapi.dll to be present. This library contains functions for monitoring the administration of partitioned network resources.

The Trojan also adds the following parameter to the system registry:

This ensures that the Trojan will be launched each time Windows is booted on the victim machine.

Payload

This Trojan is used to steal passwords. It functions on machines running Windows95/98/ME and can:

• makes screenshots;
• log keystrokes;
• tracks mouse movement;
• logs sites visited.

Harvested data will be sent to the address specified by the remote malicious user.

This Trojan can be configured. The configuration program has the following interface:

Removal instructions

If your computer does not have an up-to-date antivirus, or does not have an antivirus solution at all, follow the instructions below to delete the malicious program:

1. Use Task Manager to terminate the Trojan process.
2. Delete the original Trojan file (the location will depend on how the program originally penetrated the victim machine).
3. Delete the following registry value:

   [HKLMSoftwareMicrosoftWindowsCurrentVersionRun]
   "Kernel.Tsk "

4. Update your antivirus databases and perform a full scan of the computer (download a trial version of Kaspersky Anti-Virus).

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