Analysis by: kathleenno
ALIASES:

Troj/Agent-RQQ (Sophos); W32/Agent.SQW!tr (Fortinet); Trojan W32/Agent.VBHS (Norman)

 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 creates a window with the title "Windows Internet Explorer" and may display content from certain non-malicious sites.

If the user attempts to close the window it will continue to create an instance of itself continuously.

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size: 89,088 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 25 May 2011
Payload: Opens Internet Explorer window

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan adds the following mutexes to ensure that only one of its copies runs at any one time:

  • GO AWAY

NOTES:

It creates a window with the title "Windows Internet Explorer" and may display content from the following non-malicious sites.

  • bestisearch.com
  • chocolateplans.co.uk
  • clicks.search312.com
  • clicks.thespecialsearch.com
  • onlineinfoweb.com
  • r.localpages.com
  • r.nmwrdr.net
  • r.ypintelligence.com
  • s0.2mdn.net
  • scour.com
  • www.bestisearch.com
  • www.bestoffersdirectory.com
  • www.blinkx.com
  • www.cpulaptop.com
  • www.greatsites4all.co.uk
  • www.mashbuttons.com
  • www.onlineinfoweb.com
  • www.quick-search-results.com

If the user attempts to close the window it will continue to create an instance of itself continuously.

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 8.180.14
FIRST VSAPI PATTERN DATE: 25 May 2011

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

Scan your computer with your Trend Micro product and note files detected as TROJ_AGENT.RRT

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete the file detected as TROJ_AGENT.RRT

[ Learn More ]

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_AGENT.RRT. 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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