W32.Blackmal.E@mm

1. Copies itself as one of the following files:
   
   
   • %Windir%\Rundll16.exe
   • %System%\WINZIP_TMP.EXE
   • %System%\SAMPLE.ZIP
   • %System%\New WinZip File.exe
   • movies.exe
   • Zipped Files.exe
     
     Note:
   • %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.
   • %System% is a variable that refers to the System folder. By default this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).
     
     
2. Copies itself as one of the following files:
   
   
   • %System%\scanregw.exe
   • %System%\Winzip.exe
   • %System%\Update.exe
     
     Note: The worm monitors the above files and will recreate them if they are deleted.
     
     
3. Creates an empty .zip file using the same file name as the worm itself in the %System% folder. It then opens this file in order to hide its functionality.
   
   
4. Drops the file %System%\MSWINSCK.OCX which is a clean Microsoft control used for network connectivity.
   
   
5. Adds the value:
   
   "ScanRegistry" = "scanregw.exe /scan"
   
   to the following registry subkey:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   
   so that it runs every time Windows starts.
   
   Note: The worm monitors the above registry entry and recreates it if it is deleted.
   
   
6. Modifies the values:
   
   "WebView" = "0"
   "ShowSuperHidden" = "0"
   
   in the registry subkey:
   
   HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\
   Explorer\Advanced
   
   Note: The worm monitors the above registry entries and recreates them if they are deleted.
   
   
7. Modifies the value:
   
   "FullPath" = "1"
   
   in the registry subkey:
   
   HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\
   Explorer\CabinetState
   
   Note: The worm monitors the above registry entry and recreates it if it is deleted.
   
   
8. Adds the values:
   
   "5f54e750-ce26-11cf-8e43-00a0c911005a" = "mnlnnimimnoiuilnvjkinnkitjwjnimntntm"
   "F4FC596D-DFFE-11CF-9551-00AA00A3DC45" = "mbmabptebkjcdlgtjmskjwtsdhjbmkmwtrak"
   "190B7910-992A-11cf-8AFA-00AA00C00905" = "gclclcejjcmjdcccoikjlcecoioijjcjnhng"
   "72E67120-5959-11cf-91F6-C2863C385E30" = "ibcbbbebqbdbciebmcobmbhifcmciibblgmf"
   "096EFC40-6ABF-11cf-850C-08002B30345D" = "knsgigmnmngnmnigthmgpninrmumhgkgrlrk"
   "556C75F1-EFBC-11CF-B9F3-00A0247033C4" = "xybiedobrqsprbijaegcbislrsiucfjdhisl"
   "4D553650-6ABE-11cf-8ADB-00AA00C00905" = "gfjmrfkfifkmkfffrlmmgmhmnlulkmfmqkqj"
   "57CBF9E0-6AA7-11cf-8ADB-00AA00C00905" = "aahakhchghkhfhaamghhbhbhkbpgfhahlfle"
   "9E799BF1-8817-11cf-958F-0020AFC28C3B" = "uqpqnqkjujkjjjjqwktjrjkjtkupsjnjtoun"
   "78E1BDD1-9941-11cf-9756-00AA00C00908" = "yjrjvqkjlqqjnqkjvprqsjnjvkuknjpjtoun"
   "DC4D7920-6AC8-11cf-8ADB-00AA00C00905" = "iokouhloohrojhhhtnooiokomiwnmohosmsl"
   "7C35CA30-D112-11cf-8E72-00A0C90F26F8" = "whmhmhohmhiorhkouimhihihwiwinhlosmsl"
   "2c49f800-c2dd-11cf-9ad6-0080c7e7b78d" = "mlrljgrlhltlngjlthrligklpkrhllglqlrk"
   "899B3E80-6AC6-11cf-8ADB-00AA00C00905" = "wjsjjjlqmjpjrjjjvpqqkqmqukypoqjquoun"
   "B1EFCCF0-6AC1-11cf-8ADB-00AA00C00905" = "qqkjvqpqmqjjpqjjvpqqkqmqvkypoqjquoun"
   "6FB38640-6AC7-11cf-8ADB-00AA00C00905" = "gdjkokgdldikhdddpjkkekgknesjikdkoioh"
   "E32E2733-1BC5-11d0-B8C3-00A0C90DCA10" = "kmhfimlflmmfpffmsgfmhmimngtghmoflhsg"
   "4250E830-6AC2-11cf-8ADB-00AA00C00905" = "kjljvjjjoquqmjjjvpqqkqmqykypoqjquoun"
   "BC96F860-9928-11cf-8AFA-00AA00C00905" = "mmimfflflmqmlfffrlnmofhfkgrlmmfmqkqj"
   
   to the registry subkey:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Licenses
   
   which enables the %System%\MSWINSCK.OCX file to function.
   
   
9. May modify values in the following registry subkeys:
   
   HKEY_CURRENT_USER\Control Panel\BMale
   HKEY_CURRENT_USER\Control Panel\DNS
   
   
10. Disables the mouse and keyboard functionality the first time the worm is executed on the compromised computer.
    
    
11. Displays the following icon in the Windows Task Bar when it detects the presence of antivirus software:
    
    
    
    Note: The text "Update Please wait" is displayed when a user hovers over the icon.
    
    
12. Monitors the titles of active windows. If the user is browsing with Windows Explorer, the window title is the path to the current folder. The worm uses this information to search the current folder for the file desktop.ini. If this file exists the worm copies itself to the current folder as WinZip_Tmp.exe and creates the file temp.htt.
    
    
13. Deletes the following files:
    
    
    • %ProgramFiles%\DAP\*.dll
    • %ProgramFiles%\BearShare\*.dll
    • %ProgramFiles%\Symantec\LiveUpdate\*.*
    • %ProgramFiles%\Symantec\Common Files\Symantec Shared\*.*
    • %ProgramFiles%\Norton AntiVirus\*.exe
    • %ProgramFiles%\Alwil Software\Avast4\*.exe
    • %ProgramFiles%\McAfee.com\VSO\*.exe
    • %ProgramFiles%\McAfee.com\Agent\*.*
    • %ProgramFiles%\McAfee.com\shared\*.*
    • %ProgramFiles%\Trend Micro\PC-cillin 2002\*.exe
    • %ProgramFiles%\Trend Micro\PC-cillin 2003\*.exe
    • %ProgramFiles%\Trend Micro\Internet Security\*.exe
    • %ProgramFiles%\NavNT\*.exe
    • %ProgramFiles%\Morpheus\*.dll
    • %ProgramFiles%\Kaspersky Lab\Kaspersky Anti-Virus Personal\*.ppl
    • %ProgramFiles%\Kaspersky Lab\Kaspersky Anti-Virus Personal\*.exe
    • %ProgramFiles%\Grisoft\AVG7\*.dll
    • %ProgramFiles%\TREND MICRO\OfficeScan\*.dll
    • %ProgramFiles%\Trend Micro\OfficeScan Client\*.exe
    • %ProgramFiles%\LimeWire\LimeWire 4.2.6\LimeWire.jar
      
      Note: %ProgramFiles% is a variable that refers to the program files folder. By default, this is C:\Program Files.
      
      
14. Queries the following values:
    
    "Home Directory"
    "NAV"
    "Folder"
    "InstallLocation"
    
    under the following registry subkeys:
    
    HKEY_LOCAL_MACHINE\Software\INTEL\LANDesk\VirusProtect6\CurrentVersion
    HKEY_LOCAL_MACHINE\SOFTWARE\Symantec\InstalledApps
    HKEY_LOCAL_MACHINE\SOFTWARE\KasperskyLab\Components\101
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\
    Uninstall\Panda Antivirus 6.0 Platinum
    
    and deletes all .exe files found in the folders it locates.
    
    
15. Queries the value:
    
    "Folder"
    
    in the following registry subkey:
    
    HKEY_LOCAL_MACHINE\SOFTWARE\KasperskyLab\InstalledProducts\Kaspersky Anti-Virus Personal
    
    and deletes all files found in the folder it locates.
    
    
16. Queries the value:
    
    "Path"
    
    in the following registry subkey:
    
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\Iface.exe
    
    and deletes all *.exe and *.ppl files in the folder it locates.
    
    
17. Closes windows whose title contains any of the following strings:
    
    
    • SYMANTEC
    • SCAN
    • KASPERSKY
    • VIRUS
    • MCAFEE
    • TREND MICRO
    • NORTON
    • REMOVAL
    • FIX
      
      
18. Deletes the values:
    
    PCCIOMON.exe
    pccguide.exe
    Pop3trap.exe
    PccPfw
    Tmproxy
    McAfeeVirusScanService
    NAVAgent
    PCCClient.exe
    SSDPSRV
    rtvscn95
    defwatch
    vptray
    ScanInicio
    APVXDWIN
    KAVPersonal50
    kaspersky
    TMOutbreakAgent
    AVG7_Run
    AVG_CC
    Avgserv9.exe
    AVGW
    AVG7_CC
    AVG7_EMC
    VetAlert
    VetTray
    OfficeScanNTMonitor
    avast!
    DownloadAccelerator
    BearShare
    
    from the following registry subkeys:
    
    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\
    RunServices
    
    
19. Gathers email addresses from files with the following extensions:
    
    .htm
    .dbx
    .eml
    .msg
    .oft
    .nws
    .vcf
    .mbx
    .imh
    .txt
    .msf
    
    The worm also gathers email addresses from files with one of the following strings in the full name :
    
    
    • CONTENT.
    • TEMPORARY
      
      
20. Attempts to send itself as an email to the addresses it gathers using its own SMTP engine. The email will have the following characteristics:
    
    Subject:
    One of the following:
    
    
    • *Hot Movie*
    • A Great Video
    • 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:
    • School girl fantasies gone bad
      
      Message body:
      One of the following:
      
      
    • Note: forwarded message attached. You Must View This Videoclip!
    • >> forwarded message
    • Re: Sex Video
    • i just any one see my photos.
    • It's Free :)
    • The Best Videoclip Ever
    • Hot XXX Yahoo Groups
    • Fuckin Kama Sutra pics
    • ready to be FUCKED ;)
    • forwarded message attached.
    • VIDEOS! FREE! (US$ 0,00)
    • What?
    • i send the file.
    • Helloi attached the details.
    • Thank you
    • the file i send the details
    • hello,
    • Please see the file.
    • how are you?
    • i send the details.
      
      Attachment:
      One of the following:
      
      
    • 007.pif
    • 392315089702606E-02,.scR
    • 677.pif
    • Adults_9,zip.sCR
    • Arab sex DSC-00465.jpg
    • ATT01.zip.sCR
    • Attachments[001],B64.sCr
    • Clipe,zip.sCr
    • document.pif
    • DSC-00465.Pif
    • DSC-00465.pIf
    • eBook.pdf
    • eBook.PIF
    • image04.pif
    • New Video,zip
    • New_Document_file.pif
    • photo.pif
    • Photos,zip.sCR
    • School.pif
    • SeX,zip.scR
    • Sex.mim
    • Video_part.mim
    • WinZip,zip.scR
    • WinZip.BHX
    • WinZip.zip.sCR
    • Word XP.zip.sCR
    • Word.zip.sCR
    • 04.pif
    • DSC-00465.Pif
    • DSC-00465.pIf
    • image04.pif
      
      The attachment may be an executable file or a MIME file that contains an executable file. Those attachments that are MIME files may have the following file names:
      
      
    • 3.92315089702606E02.UUE
    • Attachments[001].B64
    • Attachments00.HQX
    • Attachments001.BHX
    • eBook.Uu
    • Original Message.B64
    • Sex.mim
    • SeX.mim
    • Video_part.mim
    • WinZip.BHX
    • Word_Document.hqx
    • Word_Document.uu
      
      These files may also have one the following file names:
      
      
    • 392315089702606E-02
    • Clipe
    • Miss
    • Photos
    • Sweet_09
      
      These file names will be combined with one of the following extensions:
      
      
    • .b64
    • .BHx
    • .HQX
    • .mim
    • .uu
    • .UUE
    • .XxE
      
      If the attachment is a MIME file, it may contain a file with one of the following file names:
      
      
    • 392315089702606E-02,UUE[BLANK SPACES].scr
    • Adults_9,zip[BLANK SPACES].scr
    • ATT01.zip[BLANK SPACES].scr
    • Atta[001],zip[BLANK SPACES].scr
    • Attachments,zip[BLANK SPACES].scr
    • Attachments[001],B64[BLANK SPACES].scr
    • Clipe,zip[BLANK SPACES].scr
    • New Video,zip[BLANK SPACES].scr
    • Photos,zip[BLANK SPACES].scr
    • SeX,zip[BLANK SPACES].scr
    • WinZip,zip[BLANK SPACES].scr
    • WinZip.zip[BLANK SPACES].scr
    • Word XP.zip[BLANK SPACES].scr
    • Word.zip[BLANK SPACES].scr
      
      The attachment may use the following icon:
      
      
      
      
21. Searches the network for the following shared folders, where it copies itself as WINZIP_TMP.EXE:
    
    
    • ADMIN$
    • C$
      
      Note: The worm also copies itself using the same file name to network shares protected by weak passwords.
      
      
22. Copies itself to network shares as the following:
    
    C$\Documents and Settings\All Users\Start Menu\Programs\Startup\WinZip Quick Pick.exe
    
    
23. Deletes the following file from network shares:
    
    C$\Documents and Settings\All Users\Start Menu\Programs\Startup\WinZip Quick Pick.lnk
    
    
24. Attempts to access the following URL:
    
    [http://]webstats.web.rcn.net/[REMOVED]/Count.cgi?df=765247
    
    
25. Enumerates the computers in the same domain as the host computer by using WNetOpenEnum.
    
    
26. Executes the command "net use \\[COMPUTER NAME] /user:administrator" to connect to that computer.
    
    Note:
    • If the user on the compromised computer is already connected to some other network computer, the worm will be able to use that connection.
    • [COMPUTER NAME] is a remote computer name and "" is a blank password.
      
      
27. Attempts to delete the following folders on the computer it connects to:
    
    
    • \C$\Program Files\Norton AntiVirus
    • \C$\Program Files\Common Files\symantec shared
    • \C$\Program Files\Symantec\LiveUpdate
    • \C$\Program Files\McAfee.com\VSO
    • \C$\Program Files\McAfee.com\Agent
    • \C$\Program Files\McAfee.com\shared
    • \C$\Program Files\Trend Micro\PC-cillin 2002
    • \C$\Program Files\Trend Micro\PC-cillin 2003
    • \C$\Program Files\Trend Micro\Internet Security
    • \C$\Program Files\NavNT
    • \C$\Program Files\Panda Software\Panda Antivirus Platinum
    • \C$\Program Files\Kaspersky Lab\Kaspersky Anti-Virus Personal
    • \C$\Program Files\Kaspersky Lab\Kaspersky Anti-Virus Personal Pro
    • \C$\Program Files\Panda Software\Panda Antivirus 6.0
    • \C$\Program Files\CA\eTrust EZ Armor\eTrust EZ Antivirus
      
      
28. Attempts to execute the following command on the compromised computer to execute its copy at the end of the hour:
    
    at [COMPUTER NAME] [HOUR]:59 /interactive \\[COMPUTER NAME]\Admin$\WINZIP_TMP.exe
    at [COMPUTER NAME] [HOUR]:59 /interactive \\[COMPUTER NAME]\C$\WINZIP_TMP.exe
    
    Note: [COMPUTER NAME] is a remote computer name and [HOUR] represents the hour when propagation begins.
    
    
29. 30 minutes after the worm file UPDATE.EXE is loaded into memory (which could be when a compromised computer is started up or when the worm is executed on a computer), the worm checks if the date is the 3rd of the month. If it is the 3rd of the month the worm will attempt to overwrite files with the following extensions in available drives from A to Z:
    
    
    • *.doc
    • *.xls
    • *.mdb
    • *.mde
    • *.ppt
    • *.pps
    • *.zip
    • *.rar
    • *.pdf
    • *.psd
    • *.dmp
      
      Note:
    • The worm will not overwrite files in the first available drive. For example if the first available drive is the C drive, the worm will overwrite files in available drives from D to Z.
    • The files are overwritten with the following text:
      
      DATA Error [47 0F 94 93 F4 F5]

Recommendations

Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

• Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
• Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
• Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
• Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
• Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
• Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
• If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
• Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
• Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
• Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
• Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
• If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
• For further information on the terms used in this document, please refer to the Security Response glossary.