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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.


Technical Details

This script written in JavaScript language quietly changes a browser's home page and search page without user confirmation.

The script uses an MS Internet Explorer 5.0 Typelib security vulnerability to create an HTA file in the Windows start-up directory. This file automatically runs upon the next Windows start-up, at which point the script gains control.

The script in the HTA file modifies the system registy keys where the home and search page addresses are specified (before modifying the keys, the script stores their values into BACKUP1.REG and BACKUP2.REG files in the Windows directory). After this, the script deletes the HTA file (and itself).

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