Analysis by: Maydalene Edsel Salvador
ALIASES:

PWS:Win32/Fareit.gen!C (Microsoft), PWS-FAUS!63ACBC6C0017 (NAI), Mal/EncPk-AJO (Sophos), Trojan.Win32.Generic!BT (Sunbelt), W32/Kryptik.AXUE!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.

It executes then deletes itself afterward.

  TECHNICAL DETAILS

File Size: 131,072 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 29 Apr 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.

Installation

This Trojan executes then deletes itself afterward.

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}"

HKEY_CURRENT_USER\Software\WinRAR
F46DD0464F683B6B28E500F11FC38892 = "{RANDOM_VALUE}"

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}p.{BLOCKED}withcertainty.com/2G1s04.exe
  • http://www.{BLOCKED}nvest.de/D7a9VQxT.exe
  • http://{BLOCKED}n.com/0MV9v.exe
  • http://{BLOCKED}-now.org/1ymUCGXf.exe

It saves the files it downloads using the following names:

  • %User Temp%\{RANDOM_NUMBERS}.exe

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}l.{BLOCKED}im.com:8080/forum/viewtopic.php
  • http://{BLOCKED}therebelight.com/forum/viewtopic.php
  • http://{BLOCKED}intmedia.net/forum/viewtopic.php
  • http://{BLOCKED}cspecialistsgroup.com/forum/viewtopic.php

NOTES:

It will also download a batch file in %User Temp%\{RANDOM_NUMBER}.bat that will delete the malicious file afterwards.

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.890.05
FIRST VSAPI PATTERN DATE: 27 Apr 2013
VSAPI OPR PATTERN File: 9.891.00
VSAPI OPR PATTERN Date: 28 Apr 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

Scan your computer with your Trend Micro product and note files detected as TSPY_FAREIT.QEP

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}"
  • In HKEY_CURRENT_USER\Software\WinRAR
    • F46DD0464F683B6B28E500F11FC38892 = "{RANDOM_VALUE}"

Step 4

Search and delete this file

[ Learn More ]
There may be some 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.
  • %User Temp%\{RANDOM_NUMBERS}.exe

Step 5

Scan your computer with your Trend Micro product to delete files detected as TSPY_FAREIT.QEP. 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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