Home / malware

PDF

Win32.BugBear.B@mm

First posted on 21 November 2011.
Source: BitDefender

Aliases :

Win32.BugBear.B@mm is also known as W32/Bugbear@MM, W32.Bugbear.B@mm.

Explanation :

This is an Internet worm that spreads trough e-mail and network shares. It uses the IFRAME vulnerability for launching itself without the user interaction.

It usually arrives in the following format:

Subject: Randomly chosen from the following list:

Greets!
Get 8 FREE issues - no risk!
Hi!
Your News Alert
$150 FREE Bonus!
Re:
Your Gift
New bonus in your cash account
Tools For Your Online Business
Daily Email Reminder
News
free shipping!
its easy
Warning!
SCAM alert!!!
Sponsors needed
new reading
CALL FOR INFORMATION!
25 merchants and rising
Cows
My eBay ads
empty account
Market Update Report
click on this!
fantastic
wow!
bad news
Lost & Found
New Contests
Today Only
Get a FREE gift!
Membership Confirmation
Report
Please Help...
Stats
I need help about script!!!
Interesting...
Introduction
various
Announcement
history screen
Correction of errors
Just a reminder
Payment notices
hmm..
update
Hello!

Or any other subject it finds in mail databases.

Attachment: Randomly chosen from the following list:

Setup, Card, Docs, news, image, images, pics, resume, photo, video, music, song, data

with double extension made by the following : Exe, scr, pif.

When the worm has send itself using the infos from other mail it found the attachment can be any file name with .exe, .scr or .pif added to the end.

Body: Can be anything.

When executed the worm checks the mutex w32sharmur to see if it is already in memory. If the mutex does not exists the worm copies itself in STARTUP folder under a random name xxxx.exe and then it exits.

After the computer is restarted the worm drops a Trojan keyloger dll file with random name. That dll is used to capture the pressed keys. It also creates two other dll files in which it stores the captured keys in an encrypted format. Also it creates a dat file where it writes information about the computer settings.

It infects the following files by adding it’s code to the end of the target file and changes the entry point to attached code:

From the program files:

winzipwinzip32.exe
kazaakazaa.exe
ICQIcq.exe
DAPDAP.exe
Winampwinamp.exe
AIM95aim.exe
LavasoftAd-aware 6Ad-aware.exe
TrillianTrillian.exe
Zone LabsoneAlarmoneAlarm.exe
StreamCastMorpheusMorpheus.exe
QuickTimeQuickTimePlayer.exe
WS_FTPWS_FTP95.exe
MSN Messengermsnmsgr.exe
ACDSee32ACDSee32.exe
AdobeAcrobat 4.0ReaderAcroRd32.exe
CuteFTPcutftp32.exe
FarFar.exe
Outlook Expressmsimn.exe
RealRealPlayer
ealplay.exe
Windows Media Playermplayer2.exe
WinRARWinRAR.exe
adobeacrobat 5.0
eaderacrord32.exe
Internet Exploreriexplore.exe

From the %windir%:

winhelp.exe
notepad.exe
hh.exe
mplaer.exe
regedit.exe
scandskw.exe

Also when infecting files it changes the encryption code in order to become harder to detect. At every 20 seconds the worm checks the running programs and if it finds one of the following it terminates it:

_AVP32.EXE
_AVPCC.EXE
_AVPM.EXE
ACKWIN32.EXE
ANTI-TROJAN.EXE
APVXDWIN.EXE
AUTODOWN.EXE
AVCONSOL.EXE
AVE32.EXE
AVGCTRL.EXE
AVKSERV.EXE
AVNT.EXE
AVP.EXE
AVP32.EXE
AVPCC.EXE
AVPDOS32.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.EXE
DVP95_0.EXE
ECENGINE.EXE
ESAFE.EXE
ESPWATCH.EXE
F-AGNT95.EXE
F-PROT.EXE
F-PROT95.EXE
F-STOPW.EXE
FINDVIRU.EXE
FP-WIN.EXE
FPROT.EXE
FRW.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
RAV7.EXE
RAV7WIN.EXE
RESCUE.EXE
SAFEWEB.EXE
SCAN32.EXE
SCAN95.EXE
SCANPM.EXE
SCRSCAN.EXE
SERV95.EXE
SMC.EXE
SPHINX.EXE
SWEEP95.EXE
TBSCAN.EXE
TCA.EXE
TDS2-98.EXE
TDS2-NT.EXE
VET95.EXE
VETTRAY.EXE
VSCAN40.EXE
VSECOMR.EXE
VSHWIN32.EXE
VSSTAT.EXE
WEBSCANX.EXE
WFINDV32.EXE
ZONEALARM.EXE

It also write itself in all the network shares it finds with the file name Setup.exe.

The worm send itself trough e-mail using the local SMTP settings.The e-mail addresses are taken from the files that contains the following strings: .ODS, INBOX, .MMF, .NCH, MBX, EML, DBX, ini, INI.

If those files are mail databases it tries to find received mails in them and it replies to those emails, changing the original attachments with the virus body and adding one of the following extensions: .exe, .scr, .pif. If the mails don’t have any attachments it takes a name from virus list or from the hard drive and adds it to the mail.

The worm has also the backdoor capabilities. It waits for HTTP connections on port 1080.

Last update 21 November 2011

 

TOP