Trojan-Downloader.Win32.IstBar

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-Downloader

Programs classified as Trojan-Downloader download and install new versions of malicious programs, including Trojans and AdWare, on victim computers. Once downloaded from the Internet, the programs are launched or included on a list of programs which will run automatically when the operating system boots up. Information about the names and locations of the programs which are downloaded are in the Trojan code, or are downloaded by the Trojan from an Internet resource (usually a web page). This type of malicious program is frequently used in the initial infection of visitors to websites which contain exploits.

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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

This is a generic detection for a family of Trojan downloaders. These malicious programs will download a range of other malicious programs from the Internet to the victim machine.

Programs from this family may create the following registry values:

[HKLMSOFTWAREDR_S]



[HKCUSOFTWAREDR_S]



[HKLMSOFTWAREClassesdrs.nuID]



[HKCUSOFTWAREClassesdrs.nuID]

All programs in this family have an identical way of getting URLs from where they will download additional malicious programs. Every 30 minutes a program from this family will download a file from, for instance, http://www.adzhooter.com/DR_S/gSD.html. This file contains addresses which direct the Trojan to other sites where it can download additional malicious programs:

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Find out the statistics of the vulnerabilities spreading in your region on statistics.securelist.com