01/23/2015

Backdoor.Ratenjay.C

Type:  Virus, Trojan
Discovered:  23.01.2015
Updated:  23.01.2015
Affected systems:  Windows 2000, Windows 7, Windows 95, Windows 98, Windows Me, Windows NT, Windows Vista, Windows XP
AV Vendor:  Symantec

Description:

The Trojan horse may arrive on the compromised computer after being spread through a removable drive.

When the Trojan is executed, it may create the following files:

• %SystemDrive%\Documents and Settings\All Users\Start Menu\Programs\Startup\[INSTALL NAME]
• %RemovableDrive%\[INSTALL NAME]
• [INSTALL PATH]\[INSTALL NAME]
• %RemovableDrive%\[FILE NAME].lnk
• %RemovableDrive%\[SUB FOLDER].lnk

Note: [INSTALL NAME] may be one of the following values:

• System.vbs
• KJ-w0rm.vbs
• w0rm.vbs

Note: [INSTALL PATH] may be one of the following values:

• %Temp%
• %SystemDrive%\Documents and Settings\All Users\Application Data
• %UserProfile%
• %ProgramData%
• %ProgramFiles%
• %WinDir%

Note: [FILE NAME] may be any file present on the removable drive.

Note: [SUB FOLDER] may be any folder under the root of the removable drive.

The Trojan may create a subfolder with the following name if no subfolder is present:

• Videos

The Trojan may create the following registry entries:

• HKEY_CURRENT_USER\Windowsshell = ["TRUE"|"FALSE"]
• HKEY_CURRENT_USER\KJ = ["Yes"|"No"]
• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\[INSTALL NAME:-4] = "wscript.exe //B [INSTALL FOLDER]\[INSTALL NAME]"
• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\[INSTALL NAME] = "[INSTALL FOLDER]\[INSTALL NAME]"

Note: The Trojan determines which registry entries are created based on the current version of the Trojan.

The Trojan opens a back door, and connects to a remote location.

Note: The remote location is chosen by the attacker and can be an IP address or URL of their choice. The usual ports for the remote location are 1010 and 1991.

The Trojan repeatedly sends one of the following commands to the remote location:

• READY
• ready

The Trojan may steal the following information from the compromised computer and send it to the remote location:

• Script name
• Computer name
• User name
• Windows version
• Country code
• List of installed antivirus products
• Presence of USB drives
• Trojan version
• .Net version
• First non-empty volume serial number

The Trojan may perform the following actions:

• Uninstall itself
• Restart scripts
• Download files to [INSTALL PATH\[FILE NAME]
• Overwrite the current script on [INSTALL PATH\[FILE NAME]
• Execute code contained in HTTP responses
• Execute commands on the local cmd.exe
• Ping targets with a specified buffer size
• Open URLs with the default browser
• End the script
• Shut down the computer
• Restart the computer
• Log off the current profile
• Sleep for one or two seconds every two iteration
• Spread itself every three iterations
• Delete itself if a virtual machine is detected