1. Symantec/
  2. Security Response/
  3. Trojan.Rloader.B


Risk Level 1: Very Low

May 29, 2013
June 3, 2013 1:20:11 AM
Infection Length:
Systems Affected:
This threat may arrive on the compromised computer after being downloaded by W32.Waledac.

When the Trojan is executed, it checks for the presence of the following registry keys to identify installed applications:
  • HKEY_CURRENT_USER\Software\CommView
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\IRIS5
  • HKEY_CURRENT_USER\Software\eEye Digital Security
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Wireshark
  • HKEY_CURRENT_USER\Software\Cygwin
  • HKEY_CURRENT_USER\AppEvents\Schemes\Apps\Bopop Observer
  • HKEY_CURRENT_USER\Software\Blabs\Bopop Observer
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Win Sniffer_is1
  • HKEY_CURRENT_USER\Software\Win Sniffer
  • HKEY_CURRENT_USER\PEBrowseDotNETProfiler.DotNETProfilter
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\StartMenu2\PRograms\Debugging Tools for Windows (x86)
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SDbgMsg
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\StartMenu2\PRograms\APIS32
  • HKEY_CURRENT_USER\Software\Syser Soft
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\APIS32
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\ORacle VM VirtualBox Guest Additions
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\VBoxGuest
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Sandboxie
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SbieDrv
  • HKEY_CURRENT_USER\Software\Classes\Folder\shell\sandbox
  • HKEY_CURRENT_USER\Software\Classes\*\shell\sandbox
  • HKEY_CURRENT_USER\SUPERAntiSpywareContextMenuExt.SASCon.1
  • HKEY_CURRENT_USER\Software\SUPERAntiSpyware.com
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\ERUNT_is1

The Trojan searches all running processes for the following applications:
  • cv.exe
  • irise.exe
  • IrisSvc.exe
  • wireshark.exe
  • dumpcap.exe
  • ZxSniffer.exe
  • Aircrack-ng Gui.exe
  • observer.exe
  • tcpdump.exe
  • WinDump.exe
  • wspass.exe
  • Regshot.exe
  • ollydbg.exe
  • PEBrowseDbg.exe
  • windbg.exe
  • DrvLoader.exe
  • SymRecv.exe
  • Syser.exe
  • apis32.exe
  • VBoxService.exe
  • VBoxTray.exe
  • SbieSvc.exe
  • SbieCtrl.exe
  • SandboxieRpcSs.exe
  • SandboxieDcomLaunch.exe
  • SUPERAntiSpyware.exe
  • ERUNT.exe
  • ERDNT.exe
  • EtherD.exe
  • Sniffer.exe
  • CamtasiaStudio.exe
  • CamRecorder.exe

The Trojan also looks for the following loaded modules to identify debuggers:

The Trojan performs several checks to ensure it's not running on any automated systems:
  • Checks the computer name against "sandbox"
  • Checks the username against "CurrentUser"
  • Checks module file name against "file.exe"
  • Checks registry for product ID "76487-337-8429955-22614"
  • Checks if a debugger is present

The Trojan collects system related information:
  • OS version
  • Machine ID
  • Locale
  • Language
  • UID
  • Volume information (%Windir%\System Volume Information)

The Trojan modifies the hosts file (%System%\drivers\hosts) to redirect search requests and ad networks to the following IP addresses:

The Trojan may download and execute additional files from the following remote locations:
  • [http://]update1.cl64domain.com[REMOVED]

The Trojan also sets the default search for Firefox and Internet Explorer to the following host:

The Trojan decrypts an embedded driver file and contacts the a remote server to inform them of successful decryption and installation of the file.

The Trojan creates the following files:
  • %Temp%\[RANDOM].sys
  • %Temp%\[RANDOM].exe

The Trojan collects information on the type of hard drive installed and checks for the following manufacturers:
  • WD-W
  • IBM
  • MAXTOR / Maxtor
  • WDC

The Trojan collects the following information from the registry:
  • Install date
  • Computer name
  • Adapters info
  • Windows Update enable status
  • SusClientId
  • ProductID

The Trojan drops Trojan.Spachanel to the following location:
%UserProfile%\Application Data\[RANDOM].exe

The Trojan injects itself into the following processes:
  • chrome.exe
  • cmd.exe
  • explorer.exe
  • far.exe
  • firefox.exe
  • iexplore.exe
  • opera.exe
  • totalcmd.exe
  • wuauclt.exe

The Trojan steals the following information:
  • OS version
  • Install date
  • Computer GUID
  • Installed disks
  • Hardware profiles

The Trojan then sends collected information to the remote server.


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: Alan Neville
Summary| Technical Details| Removal

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