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Threat Encyclopedia

JS_REALPLR.CB

Malware type: JavaScript

Aliases: Exploit.JS.RealPlr.ca (Kaspersky), Downloader (Symantec),

In the wild: Yes

Destructive: No

Language: English

Platform: Windows 2000, XP

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

Medium

Distribution potential:

Low

Description: 

This JavaScript may be hosted on a Web site and run when a user accesses the said Web site.

It takes advantage of a known vulnerability in several versions of the media player RealPlayer. More information on this vulnerability can be found on the following RealNetworks Web page:

Before exploiting the above-mentioned vulnerability, this malicious JavaScript first checks if the affected machine is running Windows 2000 or Windows XP with Internet Explorer 6 or 7. It also checks if RealPlayer is installed on the system and what version of the player is installed to determine the first few bytes of shell code that it writes on the affected system.

Once it successfully exploits the said vulnerability, this malicious JavaScript connects to a certain URL to download a malicious file detected as TROJ_AGENT.WPA. As a result, malicious routines of the downloaded file may be exhibited on the affected system.

For additional information about this threat, see:

Description created: May. 19, 2008 2:59:24 PM GMT -0800


TECHNICAL DETAILS


File type: Script

Size of malware: 7,511 Bytes

Initial samples received on: May 19, 2008

Payload 1: Downloads files

Details:

Arrival Details

This JavaScript may be hosted on a Web site and run when a user accesses the said Web site.

Download Routine

This JavaScript takes advantage of a known vulnerability in several versions of the media player RealPlayer. The said vulnerability causes a stack overflow and allows the download of possibly malicious files on the affected system. More information on this vulnerability can be found on the following RealNetworks Web page:

Before exploiting the above-mentioned vulnerability, this malicious JavaScript first checks if the affected machine is running Windows 2000 or Windows XP with Internet Explorer 6 or 7. It also checks if RealPlayer is installed on the system and what version of the player is installed to determine the first few bytes of shell code that it writes on the affected system.

It uses the import function IERPLUG.DLL to send the shell code to the installed RealPlayer, thus triggering the said exploit.

Once it successfully exploits the said vulnerability, this malicious JavaScript connects to the URL http://{BLOCKED}ilds.cn/1.exe to download a malicious file detected as TROJ_AGENT.WPA. As a result, malicious routines of the downloaded file may be exhibited on the affected system.

Affected Platforms

This JavaScript runs on Windows 2000 and XP with the following versions of RealPlayer installed:

  • 6.0.10
  • 6.0.11
  • 6.0.12
  • 6.0.14
  • 6.0.14.536
  • 6.0.14.543
  • 6.0.14.544
  • 6.0.14.550
  • 6.0.14.552

Analysis By: Kathleen Mae Notario


SOLUTION


Minimum scan engine version needed: 8.300

Pattern file needed: 5.285.00

Pattern release date: May 19, 2008


Important note: The "Minimum scan engine" refers to the earliest Trend Micro scan engine version guaranteed to detect this threat. However, Trend Micro strongly recommends that you update to the latest version in order to get comprehensive protection. Download the latest scan engine here.

Solution:

(Note: Close all instances of Internet Explorer before proceeding with the following solution.)

Important Windows ME/XP Cleaning Instructions

Users running Windows ME and XP must disable System Restore to allow full scanning of infected computers.

Users running other Windows versions can proceed with the succeeding solution set(s).

Running Trend Micro Antivirus

If you are currently running in safe mode, please restart your computer normally before performing the following solution.

Scan your computer with Trend Micro antivirus and delete files detected as JS_REALPLR.CB . To do this, Trend Micro customers must download the latest virus pattern file and scan their computer. Other Internet users can use HouseCall, the Trend Micro online virus scanner.

Applying Patch

This malware exploits a known vulnerability. Download and install the fix patch supplied by the vendor. Refrain from using this product until the appropriate patch has been installed. Trend Micro advises users to download critical patches upon release by vendors.




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