May 4, 2000 - Love Bug Virus - This
is a very recent virus. Links will be provided and updated for fixes to
various A/V programs. This information is longer
than usual due to the quickness of this spreading virus and is presented
in order found/received.
Since many antivirus vendors web sites are
being swamped with download request for patches for the Love Letter, we
have downloaded and made available the fixes at the following location:
http://www.nha.com/support/LoveBugfix/
(note capitalization)
Please note that Microsoft has a fix for
Exchange Server Administrators in the MS Outlook directory of the above
link.
Here are some recent links for information on
the Love Bug and it's variants. These sites may have more
up-to-date fixes than ours.
Virus
Bulletin F-Secure
Sophos
Symantec
NAI
Trend
---Here is the information as it
came in or we discovered it---
The following analysis is the work of the researchers at Frisk Software
International, primarily Dr. Vesselin Bontchev and Peter Ferrie.
The worm poses a risk to users that have Windows Scripting Host (including
Win '98 users, users who have installed IE 5.x in default mode, users who
have installed WSH specifically, and probably users of Windows 2000).
The worm will only spread from infected machines that have Outlook '98
or Outlook 2000 installed, but it will damage/overwrite files even if
Outlook is not in use.
The worm is received either as an e-mail attachment or via IRC. If the
user does not open (double-click on) the attached file, the worm will not
run or do any damage.
If it is received via e-mail, the Subject: of the message
is "ILOVEYOU" and the body of the message says
kindly check the attached LOVELETTER coming from me.
The name of the attachment is LOVE-LETTER-FOR-YOU.TXT.vbs
(which, if the system is configured not to show the
extensions of the files, will look like a TXT file to the
user).
If it is received via IRC, it resides in a file named
LOVE-LETTER-FOR-YOU.HTM.
When executed, the worm makes copies of itself under
the names MSKernel32.vbs and LOVE-LETTER-FOR-YOU.TXT.vbs
in the Windows System directory and under the name
Win32DLL.vbs in the Windows directory. Then it modifies
the Registry, so that the files Win32DLL.vbs and
MSKernel32.vbs will be executed every time Windows is
started.
Then the worm modifies the Registry, changing the
startup page of the Internet Explorer, so that when IE
is started, it will download a file named WIN-BUGSFIX.exe
from one of 4 possible places on http://www.skyinet.net
(randomly selected) and the Registry is modified, so
that this file is executed the next time Windows is
started.
Then the worm creates an HTML version of itself, in a
file named LOVE-LETTER-FOR-YOU.HTM in the Windows System
directory.
Next, the worm starts a copy of Outlook in the
background (only Outlook 98 or 2000 will work - not
Outlook 97 or Outlook Express). It examines all Outlook
Address Books and, if an Outlook Address Book contains
more addresses than the Windows Address Book, the worm
mass-mails itself to all addresses in that Outlook
Address Book. (The worm does NOT mass-mail itself to
any addresses in the Windows Address Book.)
Finally, the worm examines all directories on all hard
and network drives. If a file has one of the following
extensions: VBS, VBE, JS, JSE, CSS, WSH, SCT, HTA, MP2,
MP3, JPG or JPEG the worm overwrites the file with a
copy of itself. If the extension was not VBS or VBE, the
worm adds the extension VBS to the name of the file -
so that, for instance, PICTURE.JPG becomes
PICTURE.JPG.vbs. In case a MP2 or MP3 file was
overwritten, the worm also sets its file attribute to
ReadOnly.
If, during this directory traversal, any of the following
files is found: mirc32.exe, mlink32.exe, mirc.ini,
script.ini or mirc.hlp, the worm drops in that directory
a file named SCRIPT.INI which begins with the comments
;mIRC Script
; Please dont edit this script... mIRC will corrupt, if mIRC will
corrupt... WINDOWS will affect and will not run correctly. thanks
;
;Khaled Mardam-Bey
;http://www.mirc.com
This file tries to send the file LOVE-LETTER-FOR-YOU.HTM
from the Windows System directory via IRC's command /DCC
to all users joining the IRC channel which the infected
user is on.
The worm sets or modifies the following Registry keys:
HKEY_CURRENT_USER\Software\Microsoft\Windows Scripting Host\Settings\Timeout
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run\MSKernel32
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunServices\Win32DLL
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Download Directory
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\Start Page
The file WIN-BUGSFIX.exe is a Backdoor created in the
Phillippines which collects the network passwords cached
by Windows and sends them to an attacker's site when the
infected user connects to the Internet.
--
Fridrik Skulason Frisk Software International phone: +354-5-617273
Author of F-PROT E-mail: frisk@complex.is fax: +354-5-617274
---------------------------
F-SECURE
WARNS ABOUT LOVE LETTER EMAIL WORM
New Melissa-like worm went world-wide in hours
ESPOO, Finland, May 4th, 2000, F-Secure is warning users about a new e-mail
worm called VBS/LoveLetter. This worm spread by e-mailing a file called
LOVE-LETTER-FOR-YOU.TXT.vbs around.
VBS/LoveLetter is written in the VBScript language. By default, programs
written in VBScript operate only under Windows 98 and Windows 2000.
However, Windows 95 and NT 4 users are vulnerable as well if they have
installed version 5 of Microsoft Internet Explorer.
The worm was most likely written in the Philippines. It was first spotted
on early morning of Thursday the 4th of May.
The worm arrives to users in e-mail message attachments named
LOVE-LETTER-FOR-YOU.TXT.vbs. On a default Windows system, the ".vbs"
extension is not visible, and users might mistake the file to be a harmless
text file (.TXT). If the recipient open the attachment, the worm will use
Microsoft Outlook (if installed) to send a message to everyone in any
address books (including global access books of the organization - these
typically contains hundreds or thousands of addresses). The messages look
like this:
From: Name-of-the-infected-user
To: Random-name-from-the-address-book
Subject: ILOVEYOU
kindly check the attached LOVELETTER coming from me.
Attachment: LOVE-LETTER-FOR-YOU.TXT.vbs
As address books typically contain group addresses, the end result of
executing the VBS/LoveLetter worm inside an organization is that the first
infected user sends the message to everybody in the organization. After
this, other users open the message and send the message again to everyone
else. This quickly overloads e-mail servers.
"This worm spreads amazingly fast", comments Mikko Hypponen, Manager of Anti-Virus Research at F-Secure Corporation, "we got the first report
around 9:00 on Thursday morning from Norway, and by 13:00 we had reports
from over 20 countries. We estimate that total number of infected machines
is already in tens of thousands of macihnes."
In addition to spreading over e-mail, the worm also tries to use companion
techiques by greating new script files next to existing JPG and MP3 files
and by overwriting existing local script and HTML files with its own code.
The virus contains this text:
barok -loveletter(vbe) <i hate go to school>
by: spyder / ispyder@mail.com / @GRAMMERSoft Group / Manila,Philippines
A technical description of the virus is available in the F-Secure virus
description database at:
http://www.F-Secure.com/v-descs/love.htm
Sample pictures of e-mail messages generated by VBS/LoveLetter are
available in the F-Secure virus screenshots center at:
http://www.F-Secure.com/virus-info/v-pics/
--
Sami Rautiainen F-Secure Corporation
Sami.Rautiainen@F-Secure.com http://www.Europe.F-Secure.com
+358 9 8599 0656 (direct) +358 9 859 900
-------------------------
FROM NAI for GROUPSHIELD:
Detecting/blocking the new vbs_love letter virus with Groupshield Exchange.
Groupshield Exchange 4.5
--------------------------------------
With Groupshield Exchange 4.5, this virus can be blocked simply by using
Groupshield's new attachment blocking feature:
Load Exchange Admin and double-click on the Groupshield Exchange object
under the Server.
On the 'On-Access' tab, select 'Specified attachments' from the 'Attachment
blocking' box and then click on 'Select...'
In the 'Name Based Options' box, click on 'Block Filenames' and then
'Change'
Click on Add and enter the filename: 'LOVE-LETTER-FOR-YOU.TXT.vbs'. Click
OK, OK again and OK one more time to return to the Groupshield menu.
Groupshield Exchange will now block the vbs attachment and so prevent
further infections. This will work without the extra.dat.
Groupshield Exchange 4.0.4
-----------------------------------------
Download the extra.dat from our online resources. It should be available at:
http://www.drsolomon.com
Ensure that you are using the latest dat files available.
Place the extra.dat in the \Program files\Network Associates\Groupshield
Exchange\i386 folder if Groupshield is running on an Intel machine or place
the extra.dat in \Program files\Network Associates\Groupshield
Exchange\Alpha if Groupshield is running on an Alpha machine.
Stop and restart the Groupshield Exchange service from the Control Panel.
Groupshield Exchange will now detect this virus and so prevent further
infections.
------------------------------------------
TEQ provides a fix at:
http://www.teq-international.com
the
above fix apparently has a minor bug which needs a fix as follows:
This cleaner downloaded from www.teq.nl has a bug in it, it does not scan
the ROOT of any drive. To fix: Add the line in the function as shown below:
sub folderlist(folderspec)
On Error Resume Next
dim f,f1,sf
set f = fso.GetFolder(folderspec)
REM ADD LINE BELOW TO CLEAN THE ROOT
CleanFiles(folderspec)
set sf = f.SubFolders
for each f1 in sf
cleanfiles(f1.path)
folderlist(f1.path)
next
end sub
________
Symantec
provides the following
information:
BACKGROUND
This is preliminary information. It is
subject to change as we learn more
about this virus.
There is a mass breakout of a new
virus, a worm, which the Symantec
AntiVirus Research Center is currently calling VBS.LoveLetter.A.
It was discovered a few hours ago in
Europe, and has already hit several
large European Corporations.
It is likely to hit the US quickly.
Symantec European tech support has
already received many calls from corporations ht by this new virus and
SARC
believes it could be as bad as the
Melissa virus that hit last year.
Although SARC does not yet have a cure
for this worm, we hope by providing
this preliminary information, it will help admins make
email configurations which can filter for the subject line and attachment name. SARC is currently
working on a new virus definition for this.
For current information, please check the
SARC web site:
http://www.symantec.com/avcenter
TECHNICAL DATA
VBS.LoveLetter.A is an email worm, mIRC
worm, and file infector.
Threat Assessment: High
Payload:
Large scale e-mailing: All the addresses
in Microsoft Outlook address book
degrades performance: May clog mail
servers
Distribution: email
Subject of e-mail: ILOVEYOU
Name of attachment: LOVE-LETTER-FOR-YOU.TXT.vbs
Size of attachment: 10307
SARC recommends Administrators filter on
the attachment name
And Subject line immediately.
VBS.LoveLetter.A will use Microsoft
Outlook and email
itself out as an attachment with the
above subject line and attachment name. The body of the message
will be
kindly check the attached LOVELETTER
coming from me.
The virus will also infect files with the
following extensions:
vbs, vbe, js, jse, css, wsh, sct, hta,
jpg, jpeg, mp3, and mp2
The virus will drop the following files:
MSKernel32.vbs in the Windows System
directory
Win32DLL.vbs in the Windows directory
LOVE-LETTER-FOR-YOU. TXT.vbs in the
Windows System
WinFAT32.EXE in the Internet download
directory
script.ini in the mIRC directory
SARC recommends Administrators filter on
the attachment name and Subject
line immediately.
Removal: Delete found infected files.
UPDATE
The Symantec AntiVirus Research Center
(SARC) has posted the following
special definition sets for detection of
VBS.Loveletter.A:
SARCx86.EXE
- Norton AntiVirus 4.0 for Windows 95/98
- Norton AntiVirus 5.0 for Windows 95/98
- Norton AntiVirus 2000 for Windows
95/98/2000
- Norton AntiVirus 4.0 for Windows NT
- Norton AntiVirus 5.0 for Windows NT
- Norton AntiVirus Corporate Edition
6.0/7.0
- Norton AntiVirus 4.0 for NetWare
- pcANYWHERE 32, 7.5 for Windows NT
- Norton Utilities 3.0 for Windows 95/98
- Norton NT Tools
- Norton Utilities 2.0 for Windows NT
SARCi32.EXE
- Norton AntiVirus 4.0 for Windows 95/98
- Norton AntiVirus 5.0 for Windows 95/98
- Norton AntiVirus 2000 for Windows
95/98/2000
SARCi16.EXE
- Norton AntiVirus for DOS and Windows
3.x
- NT Tools
- NT Scanner
These special definitions include
detection only.
The special definitions can be downloaded
from the ftp server:
ftp://ftp.symantec.com/public/english_us_canada/antivirus_definitions/norton_antivirus/specdef
Please Note: The SARC Web site is
experiencing problems this morning. We apologize for the inconvenience. Our
Global Information Services
group is working on the problem.
---------------------------------
TREND VIRUS ALERT INFORMATION
This VBScript virus like Melissa uses Microsoft
Outlook to send email with an attachment
file "LOVE-LETTER-FOR-YOU.TXT.vbs" to all email addresses
listed in the address
list. It also propagates using mIRC by modifying the "script.ini."
After connecting to a chat server using mIRC,
the virus initiates a DCC send to all
the users in the current channel and sends a copy of itself.
This virus is currently spreading rapidly and
Trend advises all customers to download
the latest pattern file #693 or use HouseCall to scan and clean their
PCs.
NOTE: There have been some reports that Lotus
Notes users may also be affected.
Details are not available at this time.
PRESS RELEASE:
For Immediate Release
Major Virus Outbreak Alert from Trend Micro
VBS_LOVELETTER Hits Users
Worldwide
Free on-line scanning service, HouseCall, allows
users to clean their systems Trend
Micro customers can update their protection now
Cupertino, California- 4 May 2000 - Trend Micro
(Nasdaq:TMIC), a leading provider
of Internet content security, announced that protection for a new and
quickly spreading VB Script
"worm" type virus VBS_LOVELETTER is available now.
Trend Micro first detected this early this
morning European time and had a solution
available within 15 minutes. During a two-hour period several hundred
phone calls were received from major
European customers within Government, industry
and trade including ISPs, infected with the new virus.
Trend Micro customers are strongly recommended
to update their virus protection software
with a new emergency virus update pattern update number 693 as
follows:
1. Download pattern 693 from www.antivirus.com/download/pattern.asp
2. Ensure that both in and outbound mail is scanned
3. Proceed with manual scan to clean up any affected mail servers, PCs
and file servers.
It is recommended that non-customers download an
evaluation copy of ScanMail plus
pattern update 693 to install and clean mail/groupware servers.
Trend Micro is currently updating its free
on-line scanning service, HouseCall, at
http://housecall.antivirus.com. Concerned users who are not currently
using Trend Micro
software can take advantage of this free on-line service to ensure
that their systems are not infected. Trend
Micro expects to have HouseCall updated
shortly.
About VBS_LOVELETTER
This computer worm, once executed will modify
the registry and will drop files for
it to spread. It replicates using Microsoft Outlook by sending an email
with an attachment file
"LOVE-LETTER-FOR-YOU.TXT.vbs" to ALL email addresses
listed in the address list. It will
also propagate using mIRC by modifying the "script.ini".
After connecting to a chat server using mIRC, the virus will
initiate a dcc send to all the users
in the current channel and send a copy of itself.
It has also the capability to infect files with specific
extensions. The worm
will search for files with the following extensions. When it finds one,
it will overwrite the
whole file with its virus codes and change the filename to
<filename.extension> + .vbs.
This subsequently destroys the original file.
.vbs
.vbe
.js
.jse
.css
.wsh
.sct
.hta
.jpg
.jpeg
.mp3
.mp2
How to reduce risk of infection
Trend Micro cautions users to be wary of opening
email attachment with the subject
line reading "ILOVEYOU" with a phrase in the message body
reading "kindly
check the attached LOVE LETTER coming from me" - even if they
recognise the name of
the person sending the message, since this is how the virus is
spread. Savvy users can create
a rule in Outlook to delete emails with the mentioned
text in the subject line or the body of the message.
-------------------------------
To
disable VBScripts entirely:
"Love-you-letter" virus is a VBScript. VBScript is installed by default
by IE 5.0 and higher. I'm not sure about other software, but IE 4.0 and
Office 97 for sure do not install VBScript.
Before the antivirus companies provide new signatures, and if your users
do not need to run VBScripts, here is how to disable running ANY
VBscripts:
1) with REGEDIT, browse to HKEY_CLASSES_ROOT\VBSFile\ScriptEngine
2) Change the entry "VBScript" to anything you want, e.g. "abc"
Now, when opening a VBS file, an error message will pop up:
"Windows Scripting Host: Can't find script engine "abc" for script
"C:\...\...\my.vbs".
If you are administrator of Windows NT/95/98 Network, you can implement
this automatically via login script (for NT the user should have
"write" rights for the respective registry key).
The good part of this solution is that if your users do not need to run
any VBScripts, you will not have a problem in the future with new
VBS-viruses :-)
---------------------------------
- April 2000 - BAT911
Aliases: BAT.Chode.Worm, Chode, ForeSkin, 911 Share Virus
Descripton:
BAT911 uses multiple BAT files and some system programs to spread
itself through an internet connection. It searches through a range of IP
addresses of known ISPs to find an accessible computer. If an accessible
computer has a shared drive that is not password protected, the worm
checks for the presence of the file C:\WINDOWS\WIN.COM. If such file
presents, it assumes the shared drive is the C drive of the other
computer.
Once the worm finds an accessible shared drive, it will do a quick test
to see if the drive is the C drive. If it is the C drive, it will map
the shared drive.
After mapping the drive, it makes sure that it hasn't infected this
mapped drive. While performing the check, it also searches and removes
VBS.Network, a worm that uses VBS script. Then, it verifies the
writability of the drive, and proceeds to copy its files to the other
computer.
Payload:
it adds the following:
- a call to a batch file that dials
911 using the computer modem into the C:\AUTOEXEC.BAT. This
modification is done one out of five times.
- ashield.pif into the Program-StartUp
of the infected machine. This PIF file hides the worm when it is
launched.
- netstat.pif into the Program-StartUp
of the infected machine. This PIF file hides the netstat
utility that it uses.
- winsock.vbs into the Program-StartUp
of the infected machine. This VBS carries its payload.
- Log the infection in the file C:\PROGRAM
FILES\chode\chode.txt of the source computer
The WINSOCK.VBS is lauched when
Windows starts on an infected computer. On the 19th of the month, this
VBS script deletes files from the following directories:
- C:\windows
- C:\windows\system
- C:\windows\command
- C:\
Repair Notes
- Delete the C:\Program Files\Chode
directory.
- Delete C:\WINDOWS\START
MENU\PROGRAMS\STARTUP\ASHIELD.PIF
- Delete C:\WINDOWS\START
MENU\PROGRAMS\STARTUP\NETSTAT.PIF
- Delete C:\WINDOWS\START
MENU\PROGRAMS\STARTUP\WINSOCK.VBS
More Information:
http://www.cnn.com/2000/TECH/computing/04/03/911.virus/index.html
http://www.msnbc.com/news/390119.asp
http://www.fbi.gov/nipc/advis00-038.htm
http://news.cnet.com/news/0-1005-200-1623077.html?tag=st.cn.1.
http://www.sarc.com/avcenter/venc/data/bat.chode.worm.html
http://vil.nai.com/vil/wm98557.asp
http://www.antivirus.com/vinfo/virusencyclo/default5.asp?VName=BAT_CHODE911
http://www.f-secure.com/news/2000/20000402.html
http://www.sophos.com/virusinfo/analyses/911a.html
- March 2000 - W32/Pretty.worm.unp
Aliases: I-Worm.Prettypark.unp, Pretty Park.exe, Southpark Trojan
Description:
This is the unpacked edition of the originally packed "W32/Pretty.worm"
Internet worm.* This is an Internet worm
that installs on Windows 9x/NT systems. It arrives via email from
affected users who have also run this Internet worm. It appears as an
icon of a character from the animated comedy series "Southpark".
Emails containing this Internet worm have this format:
-------------
Subject: C:\CoolProgs\Pretty Park.exe
Test: Pretty Park.exe :)
-------------
Attached is the file "Pretty park.exe" and in some cases
"Pretty~1.exe".
This worm will try to email itself automatically every 30 minutes to all
email addresses listed in the Windows address book associated with
Outlook Express.
A second function of this worm is that it will also try to connect to an
IRC server and join a specific IRC channel. While connected, this worm
tries to stay connected by sending information to the IRC server, and
will also retrieve any commands from the IRC channel. While on the
determined IRC server, the author of this worm could use the connection
as a remote access trojan in order to get information such as the
computer name, registered owner, registered organization, system root
path, and Dial Up Networking username and passwords.
Removal Instructions:
On the Windows taskbar, click Start > Run. Type REGEDIT, then
click OK.Modify the following Registry value:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\exefile\ shell\open\command
and change
files32.vxd "%1" %* to "%1" %*
For clarity, these seven characters are the following: double quote,
percent sign, the numeral one, double quote, space, percent sign, and
asterisk. Don't forget the space.
Remove references to the trojan from these keys of the
registry
HKEY_CLASSES_ROOT\exefile\shell\open\command\
HKEY_LOCAL_MACHINE\exefile\CLASSES\exefile\shell\open\command\
HKEY_LOCAL_MACHINE\Software\CLASSES\exefile\shell\open\command
They should contain only the value not including brackets
"%1" %*
If applicable, remove any keys that run the main trojan under
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices\
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\
If applicable, delete the registry key if it exists
HKEY_CLASSES_ROOT\.dl
and exit Regedit
If applicable, edit WIN.INI and remove the reference to the trojan
from the run= line in the [windows] section.
If applicable, edit SYSTEM.INI and remove the reference to the trojan
from the shell= line in the [boot] section. It should just contain the
file EXPLORER.EXE.
Delete the PrettyPark.exe file. Restart your computer.
Delete the \Windows\System\Files32.vxd file.
More information:
http://www.sarc.com/avcenter/venc/data/prettypark.worm.html
http://vil.nai.com/vil/wm98500.asp
http://www.antivirus.com/vinfo/virusencyclo/default5.asp?VName=TROJ_PRETTY_PARK
http://www.msnbc.com/news/377284.asp
- February, 2000 - Distributed Denial
of Services (DDoS) attacks
Recently
there have been highly publicized reports of Denial of Service (DoS)
attacks of major internet web sites, including Amazon, Yahoo, eBay, E-Trade,
CNN, ZDNET and others.
These web sites have been brought to a crawl and some
have been brought offline for hours to work on the problems.
Most of us in the computer business already know all about this. Nevertheless we felt compelled to issue this
basic information about DoS attacks and to make sure you are aware
of the solutions
we provide to prevent this and other security breaches.
Companies should also be concerned by the possibility (see http://www.zdnet.com/pcweek/stories/news/0,4153,2436607,00.html
for example) that they may be liable for their computers actions if they
unwittingly participate in a Distributed DOS attack.
Alerts 2000
Alerts
1999
Alerts 1998