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  3. W32.Shadesrat.C

W32.Shadesrat.C

Risk Level 1: Very Low

Discovered:
June 26, 2012
Updated:
July 3, 2012 3:41:31 AM
Type:
Worm
Infection Length:
395,776 bytes
Systems Affected:
Windows 2000, Windows 7, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows Server 2008, Windows Vista, Windows XP
When the worm is executed, it copies itself as the following file:
%Temp%\D3D8THK.exe

The worm then creates the following files:
  • %UserProfile%\Templates\VSCover.exe (Trojan.ADH.2)
  • %Temp%\Application Data\data.dat (a log file used to store recorded keystrokes)

It launches the following process if the compromised computer is running Windows XP or Windows 7:
%Windir%\Microsoft.NET\Framework\v2.0.50727\AppLaunch.exe

It then copies a signed Microsoft .NET ClickOnce Launch Utility file as the following file:
%Temp%\local3.exe

The worm then creates the following registry entry so that it runs every time Windows starts:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\"Microsoft® Windows® Operating System" = "%UserProfile%\Templates\VSCover.exe"

It also creates the following registry entries in order to bypass the Windows firewall:
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List\"%Windir%\Microsoft.NET\Framework\v2.0.50727\AppLaunch.exe" = "%Windir%\Microsoft.NET\Framework\v2.0.50727\AppLaunch.exe:*:Enabled:Windows Messanger"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List\"%Temp%\local3.exe" = "%Temp%\local3.exe:*:Enabled:Windows Messanger"
It then modifies the following registry entry to allow the above firewall exceptions:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\"DoNotAllowExceptions" = "0"

It then creates the following registry entries:
  • HKEY_CURRENT_USER\Software\VB and VBA Program Settings\SrvID\ID\"DC596I04Z1" = "Local"
  • HKEY_CURRENT_USER\Software\VB and VBA Program Settings\INSTALL\DATE\"DC596I04Z1" = "[DATE THREAT EXECUTES MM/DD/YYYY]"

It then modifies the following registry entry:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\[CERTIFICATE NUMBER]\"Blob" = "[BINARY DATA]"

It then attempts to open a back door on the compromised computer by connecting to the following location on port 4444:
alosh66.myftp.org

The remote attacker may perform the following actions:
  • Log keystrokes
  • Perform denial of service (DoS) attacks
  • Open and close CD/DVD tray
  • Disable the Windows firewall
  • Gets IP information by connecting to api.ipinfodb.com
  • Modifies the hosts file
  • Downloads an image and sets it as the desktop wallpaper
  • Inject its code into processes of the attacker's choice
  • Retrieve information from the SQLite server
  • Close windows with the following title:
    • Videokälla
    • Videokilde
    • Video Allikas
    • Source vidéo
    • Sumber video
    • Físeán Foinse
    • Font de vídeo
    • Video izvora
    • Video avots
    • Sumber video
    • Video Sors
    • Videobron
    • Vídeo Fonte
    • Sursa video
    • Fuente de vídeo
    • Video Kaynak
    • Videoquelle
    • Ffynhonnell Fideo

It attempts to propagate through various peer-to-peer software, such as Azureus, BitTorrent, eMule, Kazaa, and LimeWire.

It also attempts to spread through AOL Instant Messenger (AIM).

It then attempts to spread by copying itself on all removable drives.

The worm then creates the following file so that it runs when the above drives are accessed:
%DriveLetter%\autorun.inf

It may also open a Web browser window and browse to the Facebook homepage.

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.
Writeup By: Yana Liu
Summary| Technical Details| Removal

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