JS_DLAGENT.USR

May 07, 2013
 Analysis by: Rhena Inocencio
 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet

This Trojan executes when a user accesses certain websites where it is hosted.

This is the Trend Micro detection for files that contain malicious IFRAME tags. It redirects browsers to certain sites.

  TECHNICAL DETAILS

File Size:

938 bytes

File Type:

Script

Initial Samples Received Date:

02 May 2013

Payload:

Connects to URLs/IPs

Arrival Details

This Trojan executes when a user accesses certain websites where it is hosted.

Other Details

This is the Trend Micro detection for files that contain malicious IFRAME tags.

It redirects browsers to the following sites:

  • http://{BLOCKED}l.{BLOCKED}1.us:8081/update/index.php - detected as JS_EXPLOIT.MEA

NOTES:

This Trojan is hosted on the following website:

  • http://{BLOCKED}m.{BLOCKED}l.gov/script/textsize.js

It also loads the following sites:

  • http://{BLOCKED}l.{BLOCKED}1.us:8081/web/xss.php - detected as JS_KILLAV.AA

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.894.01

FIRST VSAPI PATTERN DATE:

03 May 2013

VSAPI OPR PATTERN File:

9.895.00

VSAPI OPR PATTERN Date:

04 May 2013

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Close all opened browser windows

Step 3

Scan your computer with your Trend Micro product to delete files detected as JS_DLAGENT.USR. 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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