Backdoor.Linux.Tsunami

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: Linux

Linux is a family of UNIX-influenced operating systems based on the Linux kernel and GNU tools.

Description

The backdoor provides networking with the following hosts:

80.***.54.131

In response, the backdoor receives the following commands from an attacker:

TSUNAMI



UNKNOWN



NICK



SERVER



GETSPOOFS



SPOOFS



DISABLE



ENABLE



KILL



VERSION



KILLALL



HELP



IRC



SH



PAN



MOVE



UDP



GET

Depending on the command, the backdoor can perform the following actions:

• downloads files from the Internet to save them with the specified name and run (GET);
• executes shell commands (SH);
• communicates via HTTP and IRC channels (SERVER, NICK, IRC, VERSION, HELP, MOVE, KILL);
• organizes DDoS attacks on the specified IP address (TSUNAMI, GETSPOOFS, SPOOFS, DISABLE, ENABLE, PAN, UDP, KILLALL).

Thus, the backdoor provides an attacker with full access to an infected computer, which becomes a part of a botnet.

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