Analysis by: Rika Joi Gregorio
ALIASES:

TrojanDownloader:Win32/VB.VJ(Microsoft), W32/Scar-AR(Symantec), Win32/Qhost.Banker.HW trojan(Eset)

 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:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

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

It retrieves specific information from the affected system.

  TECHNICAL DETAILS

File Size: 28,672 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 31 Jul 2013
Payload: Collects system information

Arrival Details

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

  • %System%\csrcs.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

Other System Modifications

This spyware adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Windows Player = "%System%\csrcs.exe"

Information Theft

This spyware retrieves the following information from the affected system:

  • Host Name
  • OS Version

Stolen Information

This spyware sends the gathered information via HTTP POST to the following URL:

  • http://{BLOCKED}enezuela2.co.cc/priv8/bots.php?name={Host Name}&so={OS Version}&zila=&mail=

NOTES:

This malware has the capability to download a hosts file to this URL:

  • http://{BLOCKED}venezuela2.co.cc/priv8/bots.php

After downloading, it will then modify the system's hosts file to redirect users to fake websites of banks or financial institutions

However, as of this writing, the site is already inacessible.

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 10.188.06
FIRST VSAPI PATTERN DATE: 01 Aug 2013
VSAPI OPR PATTERN File: 10.189.00
VSAPI OPR PATTERN Date: 01 Aug 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\Microsoft\Windows\CurrentVersion\Run
    • Windows Player = "%System%\csrcs.exe"

Step 4

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