W32.Bambo

1. Copies itself as the following files:
   • %Windir%\Dllreg.exe
   • %System%\Load32.exe
   • %System%\Vxdmgr32.exe
   • %StartUp%\rundllw.exe
     
     
2. Adds the value:
   
   "load32"="%System%\load32.exe"
   
   to the registry key:
   
   HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
   
   so that the Trojan runs when you start Windows.
   
   
3. Adds the line:
   
   run=C:\Windows\Dllreg.exe
   
   to the Win.ini file so that the Trojan runs when you start Windows 95/98/Me.
   
   
4. Modifies the shell= line in the System.ini file to:
   
   shell=explorer.exe C:\WINDOWS\SYSTEM\vxdmgr32.exe
   
   so that the Trojan runs when you start Windows 95/98/Me.
   
   
5. Drops the file, %Windows%\Sysdrv.exe, and then executes it. This file will terminate the following processes:
   _avp32.exe
   _avpcc.exe
   _avpm.exe
   Agentsvr.exe
   Anti-trojan.exe
   Ants.exe
   Aplica32.exe
   Apvxdwin.exe
   Atcon.exe
   Atupdater.exe
   Atwatch.exe
   Autoupdate.exe
   Avconsol.exe
   Avp.exe
   Avp32.exe
   Avpcc.exe
   Avpcc.exe
   Avpm.exe
   Avsynmgr.exe
   Blackd.exe
   Blackice.exe
   Cfiadmin.exe
   Cfiaudit.exe
   Cfinet.exe
   Cfinet32.exe
   Cleaner.exe
   Cleaner3.exe
   Defwatch.exe
   Drwatson.exe
   Fast.exe
   Frw.exe
   Fsav.exe
   Guard.exe
   Iamapp.exe
   Iamserv.exe
   Icload95.exe
   Icloadnt.exe
   Icmon.exe
   Icsupp95.exe
   Icsuppnt.exe
   Lockdown.exe
   Lockdown2000.exe
   Luall.exe
   Lucomserver.exe
   Mcagent.exe
   Mcupdate.exe
   Mgui.exe
   Minilog.exe
   Moolive.exe
   Msconfig.exe
   Mssmmc32.exe
   Navapw32.exe
   Navw32.exe
   Navw32.exe
   Ndd32.exe
   Netstat.exe
   Nisserv.exe
   Nisum.exe
   Nmain.exe
   Nprotect.exe
   Nsched32.exe
   Nvarch16.exe
   Pavproxy.exe
   Pcciomon.exe
   Pcfwallicon.exe
   Persfw.exe
   Poproxy.exe
   Pview95.exe
   Regedit.exe
   Rtvscn95.exe
   Safeweb.exe
   Sphinx.exe
   Spyxx.exe
   Ss3edit.exe
   Sysedit.exe
   Taumon.exe
   Tc.exe
   Tca.exe
   Tcm.exe
   Tds2-98.exe
   Tds2-nt.exe
   Tds-3.exe
   Trjscan.exe
   Update.exe
   Update.exe
   Vpc42.exe
   Vptray.exe
   Vsecomr.exe
   Vshwin32.exe
   Vsmain.exe
   Vsmon.exe
   Vsstat.exe
   Watchdog.exe
   Webscanx.exe
   Wgfe95.exe
   Wradmin.exe
   Wrctrl.exe
   Wrctrl.exe
   Zapro.exe
   Zatutor.exe
   Zauinst.exe
   Zonealarm.exe
   
   NOTE: Symantec AntiVirus products detect the Sysdrv.exe file as a Trojan Horse.
   
   
6. If the operating system is Windows 95/98/Me, it adds the value:
   
   "ZoneAlarm 2.99"="%Windows%\Sysdrv.exe"
   
   to the registry key:
   
   HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\
   RunServices
   
   
7. Begins logging key strokes, capturing clipboard data, and finding the .kwm and .pwm files. The WebMoney Keeper program uses these two files. Then, the Trojan sends the captured information to a specific email address.

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.