Virus Database

Nanjing Family

Description Nanjing Family

Nanjing.1284
It is not a dangerous memory resident parasitic virus. It hooks INT 1Ch, 21h, 2Fh and writes itself to the end of COM and EXE files that are executed. Depending on the system timer the virus displays the message:
This is a Demo Virus
Nanjing Normal University
Written by CY
8.1994

Nanjing.2976
It is not a dangerous memory resident parasitic virus. It hooks INT 21h, 4Ah and writes itself to the end of .EXE files that are executed. On INT 4Ah calls the virus displays the message:
+--------------------------------------+
¦ !!!---<>---!!! ¦
¦ *.*.*.* ¦
¦ ¦
¦ Don't panic I'm harmless! ¦
¦ You have a new friend: TY_VIRUS V3.0 ¦
¦ I hope I haven't inconvenied you! ¦
¦ (c)copyright 1994.3.25 ¦
¦ Made by: ¦
¦ NANJING NORMAL UNIVERSITY ¦
¦ COMPUTER DEPARTMENT ¦
¦ ¦
¦--------------------------------------¦
¦ OK! Please wait a minuteall... ¦
+--------------------------------------+

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I-Worm.Potok

Description I-Worm.Potok

This is a family of Internet worms that spreads via e-mail by sending infected messages from infected computers. While spreading, the worms use MS Outlook, and send themselves to addresses that are stored in the MS Outlook Address Book.
The worms are written in the scripting language "Visual Basic Script" (VBS), and they work only on computers on which the Windows Scripting Host (WSH) has been installed. In Windows 98 and Windows 2000, WHS is installed by default. To spread itself, the worms access MS Outlook, and use its functions and address lists. This is available in Outlook 98/2000 only, so the worms are able to spread only when one of these MS Outlook versions is installed.
The worm arrives to a computer as an e-mail message with an attached VBS file that is the worm itself. The message in the original worm version contains:
The Subject: New Generation of drivers.
Message body:
Microsoft hasCards, comp published new driver
for all types Video atible with Windows 95/98/NT/2000/XP.
You can read about it in attachment document.
Best wishes,Microsoft.
Attached file name: "driver.doc .vbs"
The file extention (".vbs") is separated by lots of spaces and sometimes may not be displayed.
Depending on the system settings, a real attached-file extension (".vbs") may not be shown. In this case, the attached-file filename is displayed as "DRIVER.DOC".
Upon being activated by a user (by double clicking on the attached file), the worm creates its exact copy in the WINDOWS directory with the "driver.doc .vbs" name.
The worm checks whether the file system is NTFS, and if it isn't, it exits. If the file system is NTFS, the worm creates a ODBC.INI file in the WINDOWS directory, and associates four additional NTFS streams with it.
If the filesystem is NTFS, the worm creates a ODBC.INI file in the WINDOWS directory and associates four additional NTFS streams with it.
group - adds a user to the system
mail - sends a worm's copies using Outlook
main - main part of the worm
user - adds a user to the system
Then the worm creates a temporary file ("go.vbs"), which assembles all parts of the worm into one file ("notepad.vbs"), and launches it.
The part of the worm launched from NOTEPAD.VBS sends its copy to the first 50 e-mail addresses in the Outlook address book. After mailing, the worm checks whether the operating system is Windows 2000, and if it is, adds a new user with the name "Lord_Nikon" to system.

I-Worm.PrettyPark

Description I-Worm.PrettyPark

This is a virus-worm that spreads via the Internet. It appears as a PrettyPark utility attached to an e-mail. Being executed, it installs itself into the system, then sends infected messages (with its attached copy) to addresses listed in Windows Address Book, informs a user on some IRC channel about system settings and passwords, and also may be used as a Backdoor.
The worm itself is Windows PE executable file about 37Kb in length. This file is compressed by a WWPack32 utility. Being unpacked, it appears to be a 58Kb EXE file written in Delphi, the "pure" code in the file occupies just about 45Kb. In spite of this short size for a Delphi application, the worm has many features that make it a very dangerous and fast spreading program.
When the worm is executed in the system for the first time, it looks for its copy that has already been installed in the system memory. The worm does this by looking for an application that has the "#32770" window caption. If there is no such window, the virus registers itself as a hidden application (not visible in the task list) and runs its installation routine.
While installing into the system, the worm copies its file to the Windows system directory with the FILES32.VXD filename and registers it in the system registry to be run each time any other application starts. The virus does that by creating a new key in the HKEY_CLASSES_ROOT, the key name is exefileshellopencommand, and it is associated with the worm copy with the FILES32.VXD file that was created in the Windows system folder. This file has a .VXD extension, but it is not a VxD Win95/98 driver, but, rather, a "true" Windows executable.
In case of error while installing, the worm activates the SSPIPES.SCR screen saver (to hide its activity?). If there is no such file found, the worm tries to activate the Canalisation3D.SCR screen saver.
The worm then initiates a socket (Internet) connection and runs its routines that are activated: the first one once per 30 seconds, and the other once per 30 minutes.
The first of these routines, each time when it is activated, tries to connect some IRC chat (see the list below) channel, and, by special requests, send a message to a user on these channels. In this way, the worm's author seems to catch affected stations to monitor them. The list of IRC servers the worm tries to connect is as follows:
irc.twiny.net
irc.stealth.net
irc.grolier.net
irc.club-internet.fr
ircnet.irc.aol.com
irc.emn.fr
irc.anet.com
irc.insat.com
irc.ncal.verio.net
irc.cifnet.com
irc.skybel.net
irc.eurecom.fr
irc.easynet.co.uk

Being recognized by the host (virus author), the worm may be manipulated as a Backdoor Trojan horse. By a set of commands, it sends a system configuration, a disk list, directories info, as well as confidential information to the remote host: Internet access passwords and telephone numbers, Remote Access Service login names and passwords, ICQ numbers, etc. The backdoor also is able to create/remove directories, send/receive files, delete and execute them, etc.
The second routine, which is activated once per 30 minutes, opens the Windows Address Book file, reads Internet addresses from there, and sends a message to them. The message can be sent not only to private e-mail addresses, but to Internet conferences also, depending on the Address Book contents only. The message Subject field contains the text:
C:CoolProgsPretty Park.exe

The message itself contains nothing but an attached copy of the worm.

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