Virus Database

Kotos.870

Description Kotos.870

It is not a dangerous memory resident parasitic virus. It hooks INT 9, 21h and writes itself to the end of COM files that are executed. When F12 key is pressed, the virus beeps by the PC speaker and turns on Num/Caps/ScrollLock keys. The virus also calculates program executions and on 32th execution beeps by the PC speaker and displays the message:
szczescie ziemia pachniec winno
strzez sie plucia pod wiatr
RAMIREZ K2K (c) 1996 Lochow
(pozdrowienia dla pani Katarzyny Koros)

Check other viruses! Be aware! Use Antiviral Software

Linux.Nuxbee.1403

Description Linux.Nuxbee.1403

This is a relatively harmless, non-memory resident parasitic Linux virus. It searches for ELF files in the directory bin, then writes itself to the middle of the file. The virus infects files if the current user has administrator rights. It writes itself to the Entry point offset, encrypts and saves original bytes at the end of a file.
Before infecting: After infecting:

ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
³ ELF Headers ³ÄÄ¿ ³ ELF Headers ³ÄÄ¿
³ ³ ³ ³ ³ ³
ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄā ³ ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄā ³
³ Section 1 ³<ÄÙ Entry ³ Virus ³<ÄÙ Entry
³ ³ point ³ ³ point
ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄā ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄā
³ Section 2 ³ ³ Section 2 ³
ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄā ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄā
. . . . . .
ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄā ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄā
³ Section n ³ ³ Section n ³
ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄā
³ EP data ³ Encrypted data
³ ³
ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ

To restore an original file, the virus reads and encrypts the original bytes from the host file. It uses file mapping functions to infect files. All system functions are summoned by INT 80h (Sys call). The virus contains the following text string:
NuxBee by Bumblebee - The NeXt Frontier

Linux.OSF.8759

Description Linux.OSF.8759

Linux.OSF.8759 is a virus with enhanced backdoor capabilities that replicates on Linux systems and infects ELF executables.
The files infected by the virus have their file size increased by 8759 bytes. 3979 bytes belong to the actual virus code while the other 4662 belong to the code of a backdoor attached by the virus at the end of the file.
Although the backdoor code is copied along with the virus, it seems it appears designed in such way that it can be easily replaced with updated versions - the backdoor is not linked into the ELF structure, but is instead loaded and executed by the virus itself. Therefore improved versions of this virus, especially of the backdoor code can be expected in the future.
The virus infects all the files in the current directory, but avoids infecting files with file names ending with "ps".
To clarify: Files with names such as "steps", or even the popular Unix utility tool "PS" will be spared infection - as the final two lettes of their file names are "P" and "S" in sequence - "ps".
If run from a root account the virus will also attempt to infect the files from the "/bin" system directory. In all cases no more than 201 files are infected in one run.
The backdoor found in this version of the virus is listening on the UDP port 3049, or if the respective port is not available, it will try to increase the port number until one which can be used is found. Various internal commands are available to directly execute files on the target system or to launch a sniffer and forward the traffic to the other machine. The backdoor will also attempt to edit the firewall rules list and wipe out any entries that might prevent it from communicating on the hooked port, or, on the port used to communicate with the remote machine in the case of the sniffer.
Besides the above, the virus also attempts to prevent tracing by various debugging utilities by spawning a copy of itself, and attempting to debug itself from the spawned copy. If any debugger is already running, these steps will fail, and the virus will immediately terminate execution.
Another detail is if the system uptime is 5 minutes or less, the virus will also terminate execution, probably in order to prevent simple inspection on "test" machines.

Home