TROJ_FAKESYSD.WW

October 09, 2012
 Analysis by: Sabrina Lei Sioting
 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 Internet Explorer security settings. This puts the affected computer at greater risk, as it allows malicious URLs to be accessed by the computer.

It attempts to access certain websites. However, the websites are inaccessible as of this writing. It deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size:

362,496 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

31 Jan 2012

Installation

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

  • %System Root%\Documents and Settings\All Users\Application Data\{random}.exe

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It drops the following files:

  • %System Root%\Documents and Settings\All Users\Application Data\{random}
  • %Application Data%\Microsoft\Internet Explorer\Quick Launch\System Check.lnk
  • %User Profile%\Desktop\System Check.lnk
  • %User Profile%\Start Menu\Programs\System Check\System Check.lnk
  • %User Profile%\Start Menu\Programs\System Check\Uninstall System Check.lnk

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.. %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

It creates the following folders:

  • %User Profile%\Start Menu\Programs\System Check

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

Web Browser Home Page and Search Page Modification

This Trojan modifies Internet Explorer zone settings.

Other Details

This Trojan attempts to access certain websites. However, the websites are inaccessible as of this writing.

It connects to the following possibly malicious URL:

  • http://{BLOCKED}.com/britix/a
  • http://{BLOCKED}.com/britix/a
  • http://{BLOCKED}.com/britix/a
  • http://{BLOCKED}.com/britix/a
  • http://{BLOCKED}.com/britix/a
  • http://{BLOCKED}.com/britix/ar
  • http://{BLOCKED}.com/britix/a

It deletes the initially executed copy of itself

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.744.06

FIRST VSAPI PATTERN DATE:

31 Jan 2012

VSAPI OPR PATTERN File:

8.745.00

VSAPI OPR PATTERN Date:

31 Jan 2012

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

Restart in Safe Mode

[ Learn More ]

Step 3

Reset Internet security settings

[ Learn More ]

Step 4

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.  %User Profile%\Start Menu\Programs\System Check

Step 5

Search and delete these files

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
%System Root%\Documents and Settings\All Users\Application Data\{random}
%Application Data%\Microsoft\Internet Explorer\Quick Launch\System Check.lnk
%User Profile%\Desktop\System Check.lnk

Step 6

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