Threat Encyclopedia

JS_TWETTIR.A

Malware type: JavaScript

Aliases: HTML/Crypted.Gen (Avira), JS/Twitter-A (Sophos),

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:

Medium

Description: 
To get a one-glance comprehensive view of the behavior of this malware, refer to the Behavior Diagram shown below.

JS_TWETTIR.A Threat diagram

Malware Overview

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

It spreads to other systems when a user visits a Twitter profile that is injected with this JavaScript. The said script steals the user's login credentials for Twitter. It then uses the stolen credentials to post several messages pointing to the Web site www.stalkdaily.com, which functions similarly to Twitter.

For additional information about this threat, see:

Description created: Apr. 13, 2009 2:22:40 PM GMT -0800


TECHNICAL DETAILS


File type: Script

Size of malware: Varies

Initial samples received on: Apr 12, 2009

Details:

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

It spreads to other systems when a user visits a Twitter profile that is injected with this JavaScript. Once a user visits an affected profile, it downloads a copy of itself from the following Web sites:

  • http:/{BLOCKED}lolz.uuuq.com/x.js
  • http:/{BLOCKED}t.ireel.com/jsxss.js
  • http:/{BLOCKED}t.ireel.com/xssjs.js
  • http:/{BLOCKED}yo.110mb.com/wompwomp.js

The said script then steals the user's Twitter login credentials, using this information to post any of the following messages, all pointing to the Web site www.stalkdaily.com:

Dude, www.StalkDaily.com is awesome. What's the fuss?

Join www.StalkDaily.com everyone!

Woooo, www.StalkDaily.com :)

Virus!? What? www.StalkDaily.com is legit!

Wow...www.StalkDaily.com

@twitter www.StalkDaily.com

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

Analysis By: Jessa De La Torre

Revision History:

First pattern file version: 5.964.10
First pattern file release date: Apr 13, 2009

SOLUTION


Minimum scan engine version needed: 8.700

Pattern file needed: 5.967.00

Pattern release date: Apr 14, 2009


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:

 Step 1: Close all opened browser windows 

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 2: Scan your computer with your Trend Micro product to delete files detected as JS_TWETTIR.A  

*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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