W32Bugbear@MM

[debwalin]

Got this one in email from McAffee today:

McAfee.com has seen a growing number of computers infected with W32/Bugbear@MM. The risk assessment has been updated to MEDIUM FOR HOME AND CORPORATE USERS. As always, we recommend that you keep your anti-virus software up-to-date for the best protection.

Virus Information:
Date Discovered: 9/30/2002
Date Added: 9/30/2002
Origin: Malaysia
Length: 50,688 bytes (UPXed)
or 50,664 bytes
Type: Virus
SubType: E-mail worm
DAT Required: 4226

Virus Characteristics:
This virus is written in MSVC and packed with UPX. It spreads via network shares and by emailing itself. It also contains a backdoor trojan component that contains keylogging functionality.

Mass-mailing

This worm emails itself to addresses found on the local system. Possible message subject lines include the following (however, other random subject lines are also possible):

Found
150 FREE Bonus!
25 merchants and rising
Announcement
bad news
CALL FOR INFORMATION!
click on this!
Correction of errors
Cows
Daily Email Reminder
empty account
fantastic
free shipping!
Get 8 FREE issues - no risk!
Get a FREE gift!
Greets!
Hello!
history screen
hotmail.
I need help about script
Interesting
Introduction
its easy
Just a reminder
Lost
Market Update Report
Membership Confirmation
My eBay ads
New bonus in your cash account
New Contests
new reading
News
Payment notices
Please Help
Report
SCAM alert
Sponsors needed
Stats
Today Only
Tools For Your Online Business
update
various
Warning!
Your Gift
Your News Alert
The message body and attachment name vary. It is common for the attachment name to contain a double-extension (ie. .doc.pif). Outgoing messages look to make use of the Incorrect MIME Header Can Cause IE to Execute E-mail Attachment vulnerability (MS01-020) in Microsoft Internet Explorer (ver 5.01 or 5.5 without SP2).

System changes

When run on the victim machine it copies itself to %WinDir%\System as ****.EXE (where * represents random character). For example in testing:

Win98 : C:\WINDOWS\SYSTEM\FYFA.EXE
2k Pro : C:\WINNT\SYSTEM32\FVFA.EXE
The following Registry key is set in order to hook next system startup:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion
RunOnce "%random letters%" = %random filename%.EXE (Win9x)
The worm copies itself to the Startup folder on the victim machine as ***.EXE (where * represents random character), for example:



Win98 : C:\WINDOWS\Start Menu\Programs\Startup\CUK.EXE
2k Pro : C:\Documents and Settings\(username)\Start Menu\Programs\Startup\CYC.EXE
Trojan component
The worm opens a port on the victim machine - port 36794 and searches for various running processes, stopping them if found. The list of processes includes many popular AV and personal firewall products.

This remote access server allows an attacker to upload, and download files, run executes, and terminate processes.

It drops a DLL on the victim machine - keylogger related. This DLL is detected as PWS-Hooker.dll.

Network share propagation

The worm attempts to copy itself to the Startup folder of remote machines on the network (as ***.EXE - described above).





Indications Of Infection:
Port 36974 open
Existence of the following files (* represents any character):
%WinDir%\System\****.EXE (50,688 or 50,684 bytes)
%WinDir%\******.DAT
%WinDir%\******.DAT
%WinDir%\System\******.DLL
%WinDir%\System\*******.DLL
%WinDir%\System\*******.DLL





Method Of Infection:

This virus spreads over the network (via network shares) and by mailing itself (using it's on SMTP engine).

It attempts to terminate the process of the following security programs:
ACKWIN32.exe
F-AGNT95.exe
ANTI-TROJAN.exe
APVXDWIN.exe
AUTODOWN.exe
AVCONSOL.exe
AVE32.exe
AVGCTRL.exe
AVKSERV.exe
AVNT.exe
AVP32.exe
AVP32.exe
AVPCC.exe
AVPCC.exe
AVPDOS32.exe
AVPM.exe
AVPM.exe
AVPTC32.exe
AVPUPD.exe
AVSCHED32.exe
AVWIN95.exe
AVWUPD32.exe
BLACKD.exe
BLACKICE.exe
CFIADMIN.exe
CFIAUDIT.exe
CFINET.exe
CFINET32.exe
CLAW95.exe
CLAW95CF.exe
CLEANER.exe
CLEANER3.exe
DVP95_0.exe
ECENGINE.exe
ESAFE.exe
ESPWATCH.exe
FINDVIRU.exe
FPROT.exe
IAMAPP.exe
IAMSERV.exe
IBMASN.exe
IBMAVSP.exe
ICLOAD95.exe
ICLOADNT.exe
ICMON.exe
ICSUPP95.exe
ICSUPPNT.exe
IFACE.exe
IOMON98.exe
JEDI.exe
LOCKDOWN2000.exe
LOOKOUT.exe
LUALL.exe
MOOLIVE.exe
MPFTRAY.exe
N32SCANW.exe
NAVAPW32.exe
NAVLU32.exe
NAVNT.exe
NAVW32.exe
NAVWNT.exe
NISUM.exe
NMAIN.exe
NORMIST.exe
NUPGRADE.exe
NVC95.exe
OUTPOST.exe
PADMIN.exe
PAVCL.exe
PAVSCHED.exe
PAVW.exe
PCCWIN98.exe
PCFWALLICON.exe
PERSFW.exe
F-PROT.exe
F-PROT95.exe
RAV7.exe
RAV7WIN.exe
RESCUE.exe
SAFEWEB.exe
SCAN32.exe
SCAN95.exe
SCANPM.exe
SCRSCAN.exe
SERV95.exe
SPHINX.exe
F-STOPW.exe
SWEEP95.exe
TBSCAN.exe
TDS2-98.exe
TDS2-NT.exe
VET95.exe
VETTRAY.exe
VSCAN40.exe
VSECOMR.exe
VSHWIN32.exe
VSSTAT.exe
WEBSCANX.exe
WFINDV32.exe
ZONEALARM



Further info and removal tools found at:

http://vil.mcafee.com/dispVirus.asp?virus_k=99728

Deb :rolleyes:

[allenb1963]

w000000t!!! Good post Deb!!! Thank you sooooooo much for reminding me to update my AV definitions!!!

[Sick Dwarf]

Yes, check out the following.

Bugbear worm tries to steal credit cards and passwords
By Robert Vamosi
ZDNet Reviews
September 30, 2002

Bugbear is an Internet worm with a Trojan horse that attempts to steal your passwords and credit card information. Bugbear (w32.bugbear@mm), also known as Tanatos, is about 50KB long and is compressed with the UPX file compressor. Users of Internet Explorer 5.01 or 5.5 who have not patched the Incorrect Mime header flaw are vulnerable to the worm's e-mail attack. All versions of Windows are vulnerable to this worm's ability to arrive via open file sharing. Users of Macintosh, Linux, and Unix are not at risk. Since Bugbear sends infected e-mail and contains a potentially dangerous Trojan horse, it ranks a 6 on the ZDNet Virus Meter.


How it works
Bugbear arrives via e-mail with no distinct characteristics except for an attached file that is always 50,688 bytes long. The subject line and text may be taken from existing e-mail. Bugbear also arrives through network file sharing.

When run, Bugbear adds itself to the System subdirectory of the Windows folder as four random letters followed by .exe (for example, windows\System\zayb.exe). It also changes the Registry in order to run each time Windows is loaded, once again using random letters. Finally, it adds itself to the Startup folder as three random letters followed by .exe (for example, Startup\zay.exe).

The Trojan horse part of this worm first terminates many popular firewall and antivirus programs. The Trojan then launches a keystroke-logging program whose filename is a variable number of random letters followed by .dll (for example, avbxcydz.dll). Keystroke-logging programs memorize the keystrokes typed when filling out login information (passwords) or filling out shopping forms online (credit card information). Files saved by these programs can later be accessed remotely by malicious users. The Trojan component of this worm opens port 36794.

Prevention
Users of Internet Explorer 6 should be safe from the e-mail portion of this worm. Users of IE 5.01 and 5.5 who have not installed the Infected Mime header patch found in MS01-020 should do so. If you do not need to share files on a network, you should also turn off file sharing within Windows.

Removal
A few antivirus software companies have updated their signature files to include this worm. This will stop the infection upon contact and in some cases will remove an active infection from your system. For more information, see Central Command, F-Secure,McAfee, and Sophos.

It can be found here >> http://techupdate.zdnet.com/techupdate/stories/main/0,14179,2881969,00.html

[proactive]

Originally posted here (http://www.AntiOnline.com/showthread.php?threadid=#post) by allenb1963
w000000t!!! Good post Deb!!! Thank you sooooooo much for reminding me to update my AV definitions!!!

Manual update? Are there still antivirus programs without an automatic update function?