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JS_DLDR.SMA

October 08, 2012
 Analysis by: Michael Cabel
 ALIASES:

Microsoft: VirTool:JS/Obfuscator.M; Sophos: JS/Sinowal-Gen

 PLATFORM:

Windows 2000, XP, Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


This is Trend Micro detection for compromised web pages through the insertion of JavaScript codes that redirects to specific web sites.

This Trojan may be hosted on a website and run when a user accesses the said website.

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

JS

Memory Resident:

No

Initial Samples Received Date:

20 Jul 2010

Payload:

Others

Arrival Details

This Trojan may be hosted on a website and run when a user accesses the said website.

Backdoor Routine

However, as of this writing, the said sites are inaccessible.

Other Details

This Trojan does the following:

  • This is Trend Micro detection for compromised web pages through the insertion of JavaScript codes that redirects to the web site http://search.t{BLOCKED}.com/trends/weekly.json?callback=c&exclude=hashtags

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

07.322.09

FIRST VSAPI PATTERN DATE:

20 Jul 2010

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Close all opened browser windows

Step 3

Scan your computer with your Trend Micro product to delete files detected as JS_DLDR.SMA. 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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