TSPY_FAREIT.PU

June 07, 2013
 Analysis by: Rika Joi Gregorio
 ALIASES:

PWS:Win32/Fareit.gen!I(Microsoft), Trojan.Zbot(Norton), W32/Injector.ZVR!tr(Fortinet)

 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:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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:

115,200 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

30 Jan 2013

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.

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CURRENT_USER\Software\WINRAR
HWID = {random value}

HKEY_CURRENT_USER\Software\WINRAR
Client Hash = {random value}

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders
Desktop = "%System Root%\Administrator\Desktop"

(Note: The default value data of the said registry entry is %Desktop%.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
Name = "{malware name}.exe"

(Note: The default value data of the said registry entry is aim.exe.)

Download Routine

This Trojan accesses the following websites to download files:

  • http://www.{BLOCKED}cdn-node.com/1.exe
  • http://www.{BLOCKED}cdn-node.com/6.exe

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}.{BLOCKED}.137.237
  • http://{BLOCKED}.{BLOCKED}.163.195
  • http://{BLOCKED}-cdn-node.com/gate.php

NOTES:

This Trojan will drop a batch file as %User Temp%\{random number}.bat, which will delete the malware file and itself afterwards.

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.708.03

FIRST VSAPI PATTERN DATE:

04 Feb 2013

VSAPI OPR PATTERN File:

9.709.00

VSAPI OPR PATTERN Date:

05 Feb 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

Restart in Safe Mode

[ Learn More ]

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\WINRAR
    • HWID = {random value}
  • In HKEY_CURRENT_USER\Software\WINRAR
    • Client Hash = {random value}

Step 4

Restore this modified registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator’s help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
    • From: Desktop = "%System Root%\Administrator\Desktop"
      To: Desktop = %Desktop%
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
    • From: Name = "{malware name}.exe"
      To: Name = aim.exe

Step 5

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