W32.Rahiwi.A

When the worm is executed, it creates the following files at the root of all drives:

• [DRIVE LETTER]:\Data_Rahasia Administrator.exe
• [DRIVE LETTER]:\Tiwi_Cute.exe
• [DRIVE LETTER]:\autorun.inf
• [DRIVE LETTER]:\present.txt

The worm then creates the following folder, if it does not already exist:
C:\Documents and Settings\Administrator\Local Settings\Application Data\WINDOWS

It then copies itself as the following files:

• C:\Documents and Settings\Administrator\Local Settings\Application Data\WINDOWS\cute.exe
• C:\Documents and Settings\Administrator\Local Settings\Application Data\WINDOWS\imoet.exe
• C:\Documents and Settings\Administrator\Local Settings\Application Data\WINDOWS\smss.exe
• C:\Documents and Settings\Administrator\Local Settings\Application Data\WINDOWS\winlogon.exe
• C:\Documents and Settings\Administrator\Local Settings\Application Data\smss.exe
• C:\Documents and Settings\Administrator\Local Settings\Application Data\winlogon.exe
• C:\Documents and Settings\All Users\Start Menu\Programs\Startup\Empty.pif
• C:\WINDOWS\system32\IExplorer.exe
• C:\WINDOWS\system32\rpcss.dll
• C:\WINDOWS\system32\shell.exe
• C:\WINDOWS\system32\tiwi.scr
• C:\WINDOWS\tiwi.exe
• C:\tiwi.exe

The worm then creates the following registry entries, so that the worm starts when Windows starts:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\"MSMSGS” = “C:\Documents and Settings\Administrator\Local Settings\Application Data\WINDOWS\winlogon.exe”
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\"tiwi” = “C:\WINDOWS\tiwi”
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\"LegalNoticeCaption” = “Cemlekum”
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\”Shell” = “Explorer.exe "C:\WINDOWS\system32\IExplorer.exe”
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\”Userinit” = “C:\WINDOWS\system32\userinit.exe,C:\WINDOWS\system32\IExplorer.exe”
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\”LogonAdministrator” = “C:\Documents and Settings\Administrator\Local Settings\Application Data\WINDOWS\imoet.exe”
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\”System Monitoring” = “C:\Documents and Settings\Administrator\Local Settings\Application Data\WINDOWS\cute.exe”

The worm also modifies the following registry entries, so that it is executed when .bat, .com, .exe, .inf, .lnk, and .pif files are double-clicked:
HKEY_CLASSES_ROOT\batfile\shell\open\command\"(Default Value)” = "C:\WINDOWS\system32\shell.exe" "%1" %*”
HKEY_CLASSES_ROOT\comfile\shell\open\command\"(Default Value)” = "C:\WINDOWS\system32\shell.exe" "%1" %*”
HKEY_CLASSES_ROOT\exefile\”(Default Value)” = "C:\WINDOWS\system32\shell.exe" = "%1" %*
HKEY_CLASSES_ROOT\exefile\shell\open\command\"(Default Value)” = "C:\WINDOWS\system32\shell.exe" "%1" %*”
HKEY_CLASSES_ROOT\inffile\shell\Install\command\Default = "C:\WINDOWS\system32\shell.exe" "%1" %*”
HKEY_CLASSES_ROOT\lnkfile\shell\open\command\"(Default Value)” = "C:\WINDOWS\system32\shell.exe" "%1" %*”
HKEY_CLASSES_ROOT\piffile\shell\open\command\"(Default Value)” = "C:\WINDOWS\system32\shell.exe" "%1" %*”

It also modifies the following registry entry, which swaps mouse buttons:
HKEY_CURRENT_USER\Control Panel\Mouse\"SwapMouseButtons” = “01 00 00 00”

The worm then modifies the following registry entries, which changes the Internet Explorer home and search pages and changes the window title:
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\”Search Page” = “http://google.com”
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\”Start Page” = “http://google.com”
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\”Windows Title” = “Princess Tiwi is here”

It then modifies the following registry entries, which changes the screensaver:
HKEY_CURRENT_USER\Control Panel\Desktop\”SCRNSAVE.EXE” = “c:\windows\system32tiwi.scr”
HKEY_CURRENT_USER\Control Panel\Desktop\”ScreenSaveTimeOut” = “600”
HKEY_CURRENT_USER\Control Panel\Desktop\”ScreenSaverIsSecure” = “0”

The worm also modifies the following registry entries:
HKEY_CLASSES_ROOT\CLSID\{20D04FE0-3AEA-1069-A2D8-08002B30309D}\”LocalizedString” = “Tiwi_Cute”
HKEY_CLASSES_ROOT\CLSID\{645FF040-5081-101B-9F08-00AA002F954E}\"LocalizedString” = “Tiwi Suka Bersih2”
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System\"DisableRegistryTools” = “1”
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System\"DisableTaskMgr” = “1”
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System\"NoDispSettingsPage” = “1”
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\System\"DisableCMD” = “1”
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AeDebug\"Debugger” = “C:\WINDOWS\system32\Shell.exe”
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\"Hidden” = “0”
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\"HideFileExt” = “1”
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\"ShowSuperHidden” = “0”
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\"ProductID” = “U must be use ilegal os, sowhat?”
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\"ProductName” = “Princess Tiwi”
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\"RegisteredOrganization” = “Tiwi_Imoet”
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\"RegisteredOwner” = “Tiwi_Cute”
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\”LegalNoticeText” = "Ketika sang Putri tertidur, kunyalakan lampion tuk menghangatkan sang putri, dan ku tunggu sang putri terbangun. Entah sampai kapan dia bisa melihat ketulusan hatiku....(kaya di fs nya siafa yach??) :P "
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SafeBoot\"AlternateShell” = “C:\WINDOWS\tiwi.exe”
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\"Start_ShowControlPanel” = “0”

The worm then attempts to open the following file and display its contents:
C:\present.txt

It then attempts to close windows with any of the following strings in the title, some of which may be security-related:

• RegEdit_RegEdit
• ANT
• BRO
• VIR
• TASK
• REG
• ASM
• DBG
• W32
• BUG
• HEX
• DETEC
• PROC
• WALK
• FUC
• SEX
• REST
• AVAS
• Ansav
• PCMAV
• Norman
• mcafee
• ANTI
• VIRUS
• Registry Editor

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.

Summary