Virus Database

Linux.RST

Description Linux.RST

This text was written by Costin Raiu, Kaspersky Labs, Romania
This is a Linux virus that also implements several backdoor facilities, allowing an attacker to take control of the system infected with it in case the virus has been executed on account with root priviledges. The virus infects all the Linux binary executables in the current directory and the /bin directory, and listens to the first network card 'eth0' as well on the first PPP connection interface, and 'ppp0' for special packets sent in the EGP communication protocol. Whenever such a special package arrives, the virus allows the attacker to take control of the system with a root shell.
The virus will also attempt to create two new devices in the /dev directory, named "/dev/hdx1" and "/dev/hdx2", and tries to access a Web page on the ns1.xoasis.com web server.
Technical details:
The viral part works by attaching itself to normal ELF executables, patching their header, and moving the entrypoint to the viral code. At the same time, the virus relocates all the data found after the original host code to the end of its own code. It is interesting to note that the virus also performs an anti-debugging check by seeing whether the current process is 'ptrace'-ed. If so, it will immediately terminate execution. If not, the virus looks for all the files in the current directory, and attempts to infect them. After this, it will also attempt to infect all the files in the '/bin' directory, which under normal conditions will only work if the infected program has been run under an account with higher privileges. There is no attempt in the viral code to exploit any Linux vulnerabilities in order to obtain higher access when the virus is run on a normal user account.
The backdoor part of the virus attempts to create two new devices named "/dev/hdx1" and "/dev/hdx2", and if the creation succeeds, it checks for the existence of the two standard network interfaces 'eth0' or 'ppp0', and attempts to set them into "promiscuous" mode. It also attempts to create an "Exterior Gateway Protocols" (EGP) raw socket, and put it into listening mode.
When a special EGP IP packet arrives, the virus will check whether the 23rd byte in the data-packet is 0x11, then it will check for the presence of a specific password, as a 3-byte string at the offset 0x2a in the buffer. If these two conditions are met, the backdoor will check for a "command" byte, which is either 1 or 2 - if the "command" byte is "1", it will spawn a standard "/bin/sh" shell, which the attacker can control on the remote system.
Two strings can be seen inside the virus, but they are not used anywhere in the code. These strings are "snortdos" and "tory".

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Raiden.1433

Description Raiden.1433

It is not a dangerous memory resident multipartite virus. When an infected file is executed, the virus infects the MBR of the hard drive. While loading from infected MBR the virus hooks INT 13h, 1Ch, 4Fh, waits for DOS loading process and hooks INT 21h. By hooking INT 21h the virus intercepts EXE files execution and opening, and writes itself to the end of the file. By hooking INT 13h the virus intercepts accessing to infected MBR and calls stealth routine.
In some cases (depending on the command line) the virus disinfects the host file. On INT 4Fh AX=666h calls the virus displays the message:
+---------------------------------------+
¦ MBR VIRUS V.01 NECROSOFT CORPORATION ¦
¦ WRITEN BY RAIDEN COPYRIGHT (C) 1996 ¦
+---------------------------------------+

Raimon.994

Description Raimon.994

It is a very dangerous nonmemory resident encrypted overwriting virus. It searches for all files in the current directory and overwrites them. The virus contains/displays the texts:
*.* .. By RiKkY moUsE
Presenting the St00pid Raymond Lau Virus V1.0DUHH
-=>Mocking Raymon Lau to all<=-
>Mock mOck moCk mocK<
Quoting a chat between Raymonnd and Anon
RL-> There is no such thing accomputer as a computer virus!
Anon-> I think that 112MB of my hard drive might disagree with you there
RL-> Oh yes like I believe you wrote a 112MB virus!
And 2 or 3 things that won RL the prestigious FIDO IDIOT award!
How did you know Im still a Virgin? Will you be my friend?
Everybdy knows that you dont put healthy computer next to one sick
with computer virus and make healthy computer sick too!
Please guide me through this darkness to see the light even though
I wont listen to you?

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