Virus Database

Kerplunk.3059

Description Kerplunk.3059

This is a dangerous memory resident oligomorphic and stealth parasitic virus. It hooks INT 21h, and intercepts the 23 DOS function of file accessing, searching, memory allocation and others: AH=00h, 11h, 12h, 18h, 31h, 32h, 3Dh, 3Fh, 40h, 41h, 42h, 43h, 48h, 49h, 4Ah, 4Bh, 4Ch, 4Eh, 4Fh, 52h, 56h, 57h, 6Ch.
The virus writes itself to the end of COM and EXE files that are accessed. It also checks the file names, and does not summon the infection routine if a file name begins with: RA (RAV), FV (FV86/FV386), FI (FindVirus), NO (Nod-ICE), SC(McAfee Scan), VS (McAfee VShield), TB (ThunderByte Anti-Virus).
The virus disinfects an infected file when writing to them or loading for debugging. When WIN.COM is executed (Windows is starting), the virus disables its stealth routines as well as Windows' 32-bit disk access (the virus appends the option "/d:c" to the end of command line). The virus also temporarily disables its stealth routines when several utilities are executed: ARJ, RAR, LHA, PKZIP, CHKDSK, HIT, BACKUP, MSBACKUP, TELIX, DEFRAG, SPEEDISK, UC.
If an IPX driver is detected, the virus accesses the Novell Network, and causes network faults. If the user name of the infected PC is SUPERVISOR, the virus summons Novell Netware functions to perform several actions in the network:
On Mondays, it sets SUPERVISOR privileges for GUEST login
From the 1st until the 4th of any month, it disables SUPERVISOR's privileges.
If the current time is less than 9:00, it reboots the server
If the current time is less than 14:00, it cancels a randomly selected connection
On Sundays, it cancels the logging procedure.
If a user name is not SUPERVISOR:
It clears the screen on a Novell server
It sends a message to a randomly selected user on the network:
Permanent system error. Please hit the computer NOW!

The virus also contains the text:
Kerplunk coded by Virtual Daemon/SLAM

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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.

Linux.Rike.1627

Description Linux.Rike.1627
Rike is a non-dangerous nonmemory resident parasitic virus. It searches for Linux executable files in the current directory, then writes itself to the middle of the file. It's size is 1627 bytes and is written in the Assembler programming language.
The Rike virus uses low level Linux functions when working with files: SYS CALLS INT 80h. While infecting a file the virus scans sections with the attribute SHT_PROGBITS. Rike increases the size of the last section and writes itself to the free space. Next, the virus inserts a Jump command to the Entry Point address.
The virus writes its label to the ELF header. The label is the string "RIKE".

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