Trojan-Spy.Win32.Stonari

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-Spy

Trojan-Spy programs are used to spy on a user’s actions (to track data entered by keyboard, make screen shots, retrieve a list of running applications, etc.) The harvested information is then transmitted to the malicious user controlling the Trojan. Email, FTP, the web (including data in a request) and other methods can be used to transmit the data.

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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 spy program harvests confidential information. It is a Windows PE EXE file. It is written in Borland Delphi. It is 289,280 bytes in size. It is packed using AsPack. The unpacked file is approximately 704KB in size.

Installation

The Trojan creates the following system registry keys:

[HKCRSoftwareMicrosoftmicroware]
[HKLMSoftwarestonari]

In order to ensure that the Trojan is launched automatically when the system is rebooted, the Trojan registers its executable file in the system registry:

Trojan modifies the following system registry key value:

[HKCRexefileshellopencommand]
"%1 %*"

Payload

The Trojan takes screenshots and harvests information on keystrokes and mouse events.

The Trojan saves the harvested data to the following file:

%System%setpass.dat

and sends it to the remote malicious user’s email address.

The worm uses the following smtp server to send harvested data:

smtp.163.net

(This Trojan contains information written in Chinese.)

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 following registry keys:

   [HKCRSoftwareMicrosoftmicroware]
   [HKLMSoftwarestonari]

3. Delete the links to the Trojan from the following system registry keys:
   [HKLMSoftwareMicrosoftWindowsCurrentVersionRun]
   [HKLMSoftwareMicrosoftWindowsCurrentVersionRunServices]
4. Delete the original Trojan file (the location will depend on how the program originally penetrated the victim machine).
5. Delete the file created by the Trojan:

   %System%setpass.dat

6. Revert the following registry key:

   [HKCRexefileshellopencommand]
   "%1 %*"

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

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