Analysis by: Michael Cabel
 PLATFORM:

Windows 2000, XP, Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This worm may be unknowingly downloaded by a user while visiting malicious websites.

  TECHNICAL DETAILS

File Size: 212,347 bytes
File Type: PE
Memory Resident: Yes
Initial Samples Received Date: 08 Sep 2010
Payload: Compromises system security, Downloads files

Arrival Details

This worm may be unknowingly downloaded by a user while visiting malicious websites.

Installation

This worm drops the following copies of itself into the affected system:

  • %Windows%\svc3.exe

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
NetLog3 = %WINDOWS%\svc3.exe

Other System Modifications

This worm adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\New Windows
PopupMgr = no

It adds the following registry keys as part of its installation routine:

HKEY_LOCAL_MACHINE\SOFTWARE\Alexa Internet

Backdoor Routine

This worm connects to the following URL(s) to send and receive commands from a remote malicious user:

  • http://{BLOCKED}rfectexe.com

Download Routine

This worm downloads updated copies of itself from the following websites:

  • http://{BLOCKED}rfectexe.com:85/state.php?action=install&m=00-0C-29-8D-7D-4D
  • http://{BLOCKED}rfectexe.com:85/svc.php?ver=5.2.3790.3990&p=&a=&m=00-0C-29-8D-7D-4D&ua=Mozilla/4.0%20(compatible;%20MSIE%206.0;%20Win32)&alex=

Other Details

Based on analysis of the codes, it has the following capabilities:

  • It logs key strokes and mouse clicks of the affected user abd then sends the gathered information to the remote malicious user.

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI OPR PATTERN File: 7.446.05
VSAPI OPR PATTERN Date: 08 Sep 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

Terminate a process file/s detected as TSPY_SCAR.BG

[ Learn More ]

*Note: If the detected file/s is/are not displayed in theWindows Task Manager, continue doing the next steps.

Step 3

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

 
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • NetLog3 = %Windows%\svc3.exe
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\New Windows
    • PopupMgr = no

Step 4

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • Alexa Internet

Step 5

Scan your computer with your Trend Micro product to delete files detected as TSPY_SCAR.BG. 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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