TROJ_AGENT.AVDL

February 16, 2011
 Analysis by:
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This Trojan modifies HTTP traffic on the local network in order to inject a malicious script on the HTML page whenever a user visits a website.

It utilizes WinPcap libraries in order to execute the said routines. It may require other components in order to successfully perform its intended routines.

  TECHNICAL DETAILS

File Size:

25,476 bytes

Memory Resident:

No

Initial Samples Received Date:

03 Aug 2010

Other Details

This Trojan does the following:

  • Modifies HTTP traffic on the local network in order to inject a malicious script on the HTML page whenever a user visits a website. The said script attempts to connect to the following possibly malicious site, http://www.{BLOCKED}o.com/images/img.js. However, as of this writing, the said site is inaccessible.
  • Utilizes WinPcap libraries in order to execute the said routines. It may require other components in order to successfully perform its intended routines.

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

7.522.02

FIRST VSAPI PATTERN DATE:

08 Oct 2010

Step 1

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 TROJ_AGENT.AVDL 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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