Trojan.JS.KillMBR

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

A malicious program designed to electronically spy on the user’s activities (intercept keyboard input, take screenshots, capture a list of active applications, etc.). The collected information is sent to the cybercriminal by various means, including email, FTP, and HTTP (by sending data in a request).

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Platform: JS

JavaScript (JS) is a prototype-based programming language. JavaScript has traditionally been implemented as an interpreted language. The most common use is in web browsers, where it is used for scripting to add interactivity to web pages.

Description

Technical Details

This Trojan is an HTML file. It is 2,316 bytes in size.

Payload

When launching, the Trojan extracts the following file from its body to the root directory of the C: logical drive:

This file contains assembler commands which will clear the boot sector of the disk.

The Trojan then launches the following command from the command line:

command /c echo q   >>c:\repair.dbg

which will launch repair.dbg for execution.

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. Delete the original Trojan file (the location will depend on how the program originally penetrated the victim machine).
2. Delete the following file:

   Ñ:repair.dbg

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

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