Virus Alert!

http://www.avp.com/happy/happy.html

The first modern Internet Worm discovered in-the-wild

This computer worm is a kind of virus programs that does not affect
files to spread its copies, but just sends itself to the Internet as
an attach in the e-mail messages. The worm had been posted by
somebody (maybe by virus author) to several news servers, and on next
day Kaspersky labs got the report that it was discovered In-The-Wild
in Europe and continued spreading. We have no reports from USA and
other countries yet.

The worm arrives as an attach in the e-mails as a HAPPY99.EXE file.
Note:the affected sender does know that the worm appends attaches on
sending.

When an infected attach is executed and gets control, the worm
displays a funny firework in a program's window to hide its malicious
nature. During that it installs itself into the system, hooks
sendings to the Internet, converts its code to the attach and appends
it to the messages. As a result the worm being installed into the
system is able to spread its copies to all the address the messages
are sent to.

Removal and Protection

If the worm is detected in your system you can easy get rid of it
just by deleting SKA.EXE and SKA.DLL files in the system Windows
directory. You also should delete the WSOCK32.DLL file and replace it
with WSOCK32.SKA original file. The original HAPPY99.EXE file should
be also located and deleted.

To protect your computer from re-infection you need just to set
Read-Only attribute for the WSOCK32.DLL file. The worm does not pay
attention to Read-Only mode, and fails to patch the file. This trick
was discovered by Peter Szor at DataFellows
http://www.datafellows.com

The special AVP update (HAPPY.AVC database) allows to stop worm
spreading and protect your computer from attach. It is distributed
for free and is available on the AVP Web sites on the world.

Easy to Remember

Do not open and do not execute the HAPPY99.EXE file that you have
received as an attach in any message ever if you get it from trusted
source.  You should also remember: the files that you have got from
the Internet can contain malicious code that may infect your
computer, destroy the data, send confidential files to the Internet,
or install spy programs to monitor your computer from remote host.

Opening MS Office files with disabled VirusProtection and executing
not trusted executable files is extremely risky. You should remember
about that each time you see an attach in incoming message.

Technical Details

While installing the worm copies itself to the Windows system
directory with the SKA.EXE name and drops the additional SKA.DLL file
in the same directory. The worm then copies the WSOCK95.DLL with the
WSOCK95.SKA name (makes a "backup") and patches the WSOCK95.DLL file.

If the WSOCK32.DLL is in use and cannot be opened for writing, the
worm creates a new key in the system registry to run its dropper on
next rebooting:

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
=SKA.EXE

The WSOCK32.DLL patch consists of a worm initialization routine and
two redirected exports. The initialization routine is just a small
piece of worm code - just 202 bytes. It is saved to the end of
WSOCK32.DLL code section (".text" section). The WSOCK95.DLL has
enough of space for that, and the size of WSOCK32.DLL does not
increased during infection.

Then the worm patches the WSOCK32.DLL export tables so that two
functions ("connect" and "send") will point to the worm
initialization routine at the end of WSOCK32.DLL code section.

When a user is connecting to the Internet the WSOCK32.DLL is
activated, and the worm hooks two events: connection and data
sending. The worm monitors the nntp and email ports (25 and 119).
When it detects connection by one of these ports, it loads its
SKA.DLL library that has two exports: "mail" and "news". Depending on
the port number the worm calls one of these routines, but both of
them create a new message, insert UUencoded worm HAPPY99.EXE dropper
into it, and send to the Internet address.


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_/                                                        _/
_/        John S. Walker                                  _/
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