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Win32.Nyxem.E@mm

LOW
MEDIUM
around 93 KB (upx packed), around 110 KB
(Email-Worm.Win32.Nyxem.e, W32/Nyxem-D, WORM_GREW.A, W32/MyWife.d@MM)

Symptoms

[Warning]

On the 3rd of every month, the virus will overwrite all files that have the extensions found below in the technical description.

- Presence of any of the next files in %WINDOWS% folder:

 %WINDOWS%\Rundll16.exe

- Presence of any of the next files in %SYSTEM% folder:

 %SYSTEM%\scanregw.exe
 %SYSTEM%\Update.exe
 %SYSTEM%\Winzip.exe

- Presence of the next file in Startup folder:

 C:\Documents and Settings\All Users\Start Menu\Programs\Startup\WinZip Quick Pick.exe

- Presence of:

 C:\WINZIP_TMP.exe

- Presence of the next registry keys or entries:

 [HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run]
 "ScanRegistry" = "%SYSTEM%\scanregw.exe /scan"


  where %WINDOWS% points to Windows folder (or WinNT on Windows NT based systems)
        %SYSTEM% points to "System" folder on Windows 9x systems and "System32" folder on WinNT systems.

Removal instructions:

- use the free removal tool from BitDefender
- automatic removal: let BitDefender delete/disinfect files found infected.

Analyzed By

Patrik Vicol, virus researcher

Technical Description:

This threat comes by e-mail. It is written in Visual Basic, and is compiled in p-code.
It spreads via e-mail as a mass mailer using it's own SMTP engine and also through network shares.

Has a dangerous payload, as on the 3rd of each month, 30 minutes after the system has been started,
searches for files with the following extension

.dmp .doc .mdb .mde .pdf .pps .ppt .psd .rar .xls .zip

on all available drives, and replaces their content with

"DATA Error [47 0F 94 93 F4 K5]"


The e-mail format is as follows:

Subject: (may be one of the following)

 *Hot Movie*
 A Great Video
 eBook.pdf
 Fw:
 Fw: DSC-00465.jpg
 Fw: Funny :)
 Fw: Picturs
 Fw: Real show
 Fw: SeX.mpg
 Fw: Sexy
 Fwd: Crazy illegal Sex!
 Fwd: image.jpg
 Fwd: Photo
 give me a kiss
 Miss Lebanon 2006
 My photos
 Part 1 of 6 Video clipe
 Photos
 Re:
 Re: Sex Video
 School girl fantasies gone bad
 the file
 Word file

Body: (may be one of the following, or a composition i)

 ----- forwarded message -----
 >> forwarded message
 bye
 F**kin Kama Sutra pics
 forwarded message attached.
 hello,
 hi
 Hot XXX Yahoo Groups
 how are you?
 i attached the details.
 i just any one see my photos.
 i send the details
 i send the details.
 i send the file.
 It's Free :)
 Note: forwarded message attached.
 OK ?
 Please see the file.
 ready to be F**KED ;)
 Thank you
 The Best Videoclip Ever
 VIDEOS! FREE! (US$ 0,00)
 What?
 You Must View This Videoclip!

Note: for instance, the (composed) body may be : hello, i send the details

Attachment
(may be an executable or a MIME-encoded executable)

 007.pif                  
 04.pif                   
 677.pif                  
 Arab sex DSC-00465.jpg   
 document.pif             
 DSC-00465.Pif            
 DSC-00465.pIf            
 eBook.PIF                
 image04.pif              
 New_Document_file.pif    
 photo.pif                
 School.pif               

If the file is MIME-encoded, the attachment may be:

 3.92315089702606E02.UUE
 Attachments[001].B64
 Attachments00.HQX
 Attachments001.BHX
 eBook.Uu
 SeX.mim
 Sex.mim
 Video_part.mim
 WinZip.BHX
 Word_Document.hqx
 Word_Document.uu

In MIME-encoded form, the attachment may also be composed from a predefined list of strings,
so filename may be:

392315089702606E-02            
Clipe                          
Miss                           
Sweet_09                       

and extension may be any of:

.b64
.BHx
.HQX
.mim
.uu 
.UUE

The the executable within MIME-encoded file may be:

 392315089702606E-02,UUE .scR  
 Adults_9,zip .sCR             
 ATT01.zip .sCR                
 Atta[001],zip .SCR            
 Attachments,zip .SCR          
 Attachments[001],B64 .sCr     
 Clipe,zip .sCr                
 New Video,zip .sCr            
 Photos,zip .sCR               
 SeX,zip .scR                  
 WinZip,zip .scR               
 WinZip.zip .sCR               
 Word XP.zip .sCR              
 Word.zip .sCR                 



Once the executable is run (attachment from e-mail or other way), the virus will do
the following:


1. Copies itself as one or more of the following files:
(also see symptoms above)

 %WINDOWS%\Rundll16.exe
 %SYSTEM%\scanregw.exe
 %SYSTEM%\Update.exe
 %SYSTEM%\Winzip.exe


2. Creates autorun registry entry:

[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run]
"ScanRegistry" = "%SYSTEM%\scanregw.exe /scan"]


3. Modifies/sets the registry keys:

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
 "WebView" = 0
 "ShowSuperHidden" = 0

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\CabinetState]
"FullPath" = 1


4. Harvests e-mail addresses from files with extension:

.DBX .EML .HTM .IMH .MBX .MSF .MSG .NWS .OFT .TXT .VCF

also scans inside files whose filenames match the strings "CONTENT." or "TEMPORARY"
for e-mail addresses, but avoids e-mail addresses that contain:

@HOTMAIL
@HOTPOP
@YAHOOGROUPS
ANTI
AVG
CA.COM
CILLIN
EEYE
GROUPS.MSN
KASPER
MCAFEE
MICROSOFT
NOMAIL.YAHOO.COM
NORTON
PANDA
SCRIBE
SECUR
SPAM
SYMANTEC
TREND
TRUST
VIRUS

The virus will send itself to the harvested e-mail addresses in the format described earlier.


5. Network shares scan and propagation.

Enumerates available shares, and also checks "Personal" and "Recent" entries in

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]

The virus may replace randomly one of the files from the found folders, with a copy of itself, barring .exe extension.

Attempts to copy itself to network shares as:

New WinZip File.exe
Zipped Files.exe
movies.exe
WINZIP_TMP.exe

Also as

 C$\Documents and Settings\All Users\Start Menu\Programs\Startup\WinZip Quick Pick.exe

and deletes

 C$\Documents and Settings\All Users\Start Menu\Programs\Startup\WinZip Quick Pick.lnk

Also, attempts to delete files from folders:

\C$\Program Files\CA\eTrust EZ Armor\eTrust EZ Antivirus
\C$\Program Files\Common Files\symantec shared
\C$\Program Files\Kaspersky Lab\Kaspersky Anti-Virus Personal
\C$\Program Files\Kaspersky Lab\Kaspersky Anti-Virus Personal Pro
\C$\Program Files\McAfee.com\Agent
\C$\Program Files\McAfee.com\shared
\C$\Program Files\McAfee.com\VSO
\C$\Program Files\NavNT
\C$\Program Files\Norton AntiVirus
\C$\Program Files\Panda Software\Panda Antivirus 6.0
\C$\Program Files\Panda Software\Panda Antivirus Platinum
\C$\Program Files\Symantec\LiveUpdate
\C$\Program Files\Trend Micro\Internet Security
\C$\Program Files\Trend Micro\PC-cillin 2002
\C$\Program Files\Trend Micro\PC-cillin 2003


6. Attempts to delete files from "Program Files" inside the following folders:

\DAP\*.dll                                 
\BearShare\*.dll                           
\Symantec\LiveUpdate\*.*                   
\Symantec\Common Files\Symantec Shared\*.* 
\Norton AntiVirus\*.exe                    
\Alwil Software\Avast4\*.exe               
\McAfee.com\VSO\*.exe                      
\McAfee.com\Agent\*.*                      
\McAfee.com\shared\*.*                     
\Trend Micro\PC-cillin 2002\*.exe          
\Trend Micro\PC-cillin 2003\*.exe          
\Trend Micro\Internet Security\*.exe       
\NavNT\*.exe                               
\Morpheus\*.dll                            
\Kaspersky Lab\Kaspersky Anti-Virus Personal\*.ppl 
\Kaspersky Lab\Kaspersky Anti-Virus Personal\*.exe 
\Grisoft\AVG7\*.dll                                
\TREND MICRO\OfficeScan\*.dll                      
\Trend Micro\OfficeScan Client\*.exe               
\LimeWire\LimeWire 4.2.6\LimeWire.jar              

and also

\HyperTechnologies\Deep Freeze\*.exe

the virus also looks for registry keys:

Software\INTEL\LANDesk\VirusProtect6\CurrentVersion
SOFTWARE\Symantec\InstalledApps
SOFTWARE\KasperskyLab\InstalledProducts\Kaspersky Anti-Virus Personal
SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\Iface.exe
SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Panda Antivirus 6.0 Platinum

in order to delete various files.


7. Terminates applications whose caption contain any of the strings:

SYMANTEC  
SCAN      
KASPERSKY 
VIRUS     
MCAFEE    
TREND MICRO
NORTON    
REMOVAL   


8. Deletes registry entries from:

[Software\Microsoft\Windows\CurrentVersion\Run]
[Software\Microsoft\Windows\CurrentVersion\RunServices]

that contain the following strings:

APVXDWIN
avast!
AVG_CC
AVG7_CC
AVG7_EMC
AVG7_Run
Avgserv9.exe
AVGW
BearShare
ccApp
CleanUp
defwatch
DownloadAccelerator
kaspersky
KAVPersonal50
McAfeeVirusScanService
MCAgentExe
McRegWiz
MCUpdateExe
McVsRte
MPFExe
MSKAGENTEXE
MSKDetectorExe
NAV Agent
NPROTECT
OfficeScanNT Monitor
PCCClient.exe
pccguide.exe
PCCIOMON.exe
PCCIOMON.exe
PCClient.exe
PccPfw
Pop3trap.exe
rtvscn95
ScanInicio
ScriptBlocking
SSDPSRV
TM Outbreak Agent
tmproxy
Vet Alert
VetTray
VirusScan Online
vptray
VSOCheckTask


9. Notifies the author for infection, by connecting to:

"http://webstats.web.rcn.net/cgi-bin/Count.cgi?df=?????"


10. May display a tray icon in systray, saying "Update Please wait", and also attempt to
download an update of itself.



Additional notes:

- the virus also carries an upx packed version of MSWINSCK.OCX, which will register using
  "regsvr32 /s MSWINSCK.OCX" command.

- the virus may block acces to "http://www.microsoft.com"