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Threat Encyclopedia

JS_RENOS.WCF

Malware type: JavaScript

Aliases: No Alias Found

In the wild: Yes

Destructive: No

Language: English

Platform: Windows 98, ME, NT, 2000, XP, Server 2003

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

Low

Distribution potential:

Low

Description: 

This malicious Javascript may be hosted on a Web site and run when a user accesses the said Web site. It may be downloaded from certain remote sites.

It displays fake alerts that warn users of infection. It also displays fake scanning results of the affected system.

For additional information about this threat, see:

Description created: Dec. 21, 2009 6:54:47 AM GMT -0800


TECHNICAL DETAILS


File type: Script

Memory resident:  Yes

Size of malware: varies

Initial samples received on: Dec 21, 2009

Details:

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

It may be downloaded from the following remote site(s):

  • http://{BLOCKED}zonein-safe.net/Scripts/Strategies/6af3a5ccdb671cbe0ab8891f5f48acb4433002511.js
  • http://{BLOCKED}zonein-safe.net/Scripts/Strategies/7a48d6b99f698fbb8bbe15cc8a588b0bb73002511.js
  • http://{BLOCKED}zonein-safe.net/Scripts/Strategies/8af54ca8fcd9e0ea74eea3097d6f3ae8303002511.js

It displays fake alerts that warn users of infection. It also displays fake scanning results of the affected system.

This malicious Javascript runs on Windows 98, ME, NT, 2000, XP, Server 2003.


Analysis By: Kathleen Mae Notario


SOLUTION


Minimum scan engine version needed: 8.900


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:

For Windows ME and XP users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

 Step 1: Close all opened browser windows 

 Step 2: Scan your computer with your Trend Micro product to delete files detected as JS_RENOS.WCF  

*Note: If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.




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