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Trojan.JS.Offensive

Risk Level 2: Low

Discovered:
August 20, 2001
Updated:
February 13, 2007 11:48:49 AM
Also Known As:
Trojan.Offensive
Type:
Trojan Horse

Symptoms
  • Most options in the Start menu have the icon for a text file.
  • No icons are visible on the Windows desktop.
  • You cannot start any programs.
  • You cannot shut down Windows, and you see a message that it cannot be shut down due to security settings.
  • None of the symptoms are changed if you start in Safe mode.

Activation
When activated, this Trojan creates the following registry keys and values:

Key:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\Explorer
Values:
RestrictRun
NoChangeStartMenu
NoClose
NoDrives
NoDriveTypeAutoRun
NoFavoritesMenu
NoFileMenu
NoFind
NoFolderOptions
NoInternetIcon
NoRecentDocsMenu
NoLogOff
NoRun
NoSetActiveDesktop
NoSetFolders
NoSetTaskbar
NoWindowsUpdate
Nodesktop
NoViewContextMenu
NoNetHooD
NoEntioeNetwork
NoWorkgroupContents
NoSaveSettings

Key:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\System
Values:
DisableRegistryTools
NoConfigPage
NoDevMgrPage
NoDispAppearancePage
NoDispScrSavPage
NoDispBackgroundPage
NoDispSettingsPage
NoFileSysPage
NoVirtMemPage

Key:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\WinOldApp

Values:
NoRealMode
Disabled

Keys:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\Window Title

HKEY_LOCAL_MACHINE\Software\Microsoft\
Internet Explorer\Main\Window Title
Values:
Window Title
Start Page

Key:
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Winlogon
Values:
LegalNoticeCaption
LegalNoticeText

Key:
HKEY_LOCAL_MACHINE\Software\Microsoft\
Internet Explorer\Extensions\
{C18CB140-0BBB-11D4-8FE8-0088CC102438}

Values:
ButtonText
CLSID
DefaultVisible
Exec
MenuStatusBar
MenuText

Key:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\MenuExt\how to * japanese

Key:
HKEY_CLASSES_ROOT\Drive\shell\how to * japan

Keys:
HKEY_LOCAL_MACHINE\Software\CLASSES\.exe
HKEY_LOCAL_MACHINE\Software\CLASSES\.reg
HKEY_LOCAL_MACHINE\Software\CLASSES\.htm
HKEY_LOCAL_MACHINE\Software\CLASSES\.html
HKEY_LOCAL_MACHINE\Software\CLASSES\.txt
HKEY_LOCAL_MACHINE\Software\CLASSES\.inf
HKEY_LOCAL_MACHINE\Software\CLASSES\.dll
HKEY_LOCAL_MACHINE\Software\CLASSES\.ini
HKEY_LOCAL_MACHINE\Software\CLASSES\.sys
HKEY_LOCAL_MACHINE\Software\CLASSES\.com
HKEY_LOCAL_MACHINE\Software\CLASSES\.bat
Value:
(default) is set to textfile

Key:
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
Value:
internat.exe
ScanRegistry
TaskMonitor
SystemTray
LoadPowerProfile

Key:
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\RunServices
Value:
LoadPowerProfile
SchedulingAgent

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: Atli Gudmundsson
Summary| Technical Details| Removal

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