Backdoor.Win32.Tripod

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: Backdoor

Backdoors are designed to give malicious users remote control over an infected computer. In terms of functionality, Backdoors are similar to many administration systems designed and distributed by software developers. These types of malicious programs make it possible to do anything the author wants on the infected computer: send and receive files, launch files or delete them, display messages, delete data, reboot the computer, etc. The programs in this category are often used in order to unite a group of victim computers and form a botnet or zombie network. This gives malicious users centralized control over an army of infected computers which can then be used for criminal purposes. There is also a group of Backdoors which are capable of spreading via networks and infecting other computers as Net-Worms do. The difference is that such Backdoors do not spread automatically (as Net-Worms do), but only upon a special “command” from the malicious user that controls them.

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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 backdoor program obtains a file from the Internet and spawns it on a victim's machine in hidden mode. Upon being run, the backdoor copies itself to Wthe indows system directory with the IESTUB32.EXE name and registers itself in system registry in the auto-run section:

HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRun

It then, depending on the current date, loads the file WELCOME.GIF from http://members.tripod.com Web site, stores it in the Windows temporary directory with the UNINST32.EXE name and spawns it. The UNINST32.EXE program's behavior is unknown and depends only on a backdoor author's needs.

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