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TROJ_QHOST.DMS

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: No

  • In the wild: Yes

  OVERVIEW

This Trojan executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

It modifies the affected system's HOSTS files. This prevents users from accessing certain websites.

It attempts to steal sensitive online banking information, such as user names and passwords. This routine risks the exposure of the user's account information, which may then lead to the unauthorized use of the stolen data. It attempts to steal information, such as user names and passwords, used when logging into certain banking or finance-related websites.

  TECHNICAL DETAILS

File Size:

23,040 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

30 Oct 2011

Payload:

Modifies HOSTS file, Connects to URLs/IPs

Arrival Details

This Trojan may be downloaded from the following remote sites:

  • http://w{BLOCKED}s.com.br/advogadosoab/telas/www.facebook.com

Installation

This Trojan creates the following folders:

  • %User Temp%\5.tmp

(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.)

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\5.tmp\1.18.bat - detected as BAT_HOST.FK

(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.)

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

HOSTS File Modification

This Trojan modifies the affected system's HOSTS files to prevent a user from accessing the following websites:

  • {BLOCKED}.{BLOCKED}.238.100 itauuniclass.com.br
  • {BLOCKED}.{BLOCKED}.238.100 www.itauuniclass.com.br
  • {BLOCKED}.{BLOCKED}.238.100 www4.itau.com.br
  • {BLOCKED}.{BLOCKED}.238.100 itau.com.br
  • {BLOCKED}.{BLOCKED}.238.100 www.itau.com.br
  • {BLOCKED}.{BLOCKED}.238.100 www.bancoitau.com.br
  • {BLOCKED}.{BLOCKED}.238.100 bancoitau.com.br
  • {BLOCKED}.{BLOCKED}.238.100 www.itaupersonnalite.com.br
  • {BLOCKED}.{BLOCKED}.238.100 itaupersonnalite.com.br
  • {BLOCKED}.{BLOCKED}.0.1 localhost
  • {BLOCKED}.{BLOCKED}.238.100 bradesco.com.br
  • {BLOCKED}.{BLOCKED}.238.100 www.bradesco.com.br
  • {BLOCKED}.{BLOCKED}.238.100 www4.bradesco.com.br
  • {BLOCKED}.{BLOCKED}.238.100 www.prime.com.br
  • {BLOCKED}.{BLOCKED}.238.100 prime.com.br
  • {BLOCKED}.{BLOCKED}.238.100 www.bradescoprime.com.br
  • {BLOCKED}.{BLOCKED}.238.100 bradescoprime.com.br
  • {BLOCKED}.{BLOCKED}.0.1 localhost
  • {BLOCKED}.{BLOCKED}.238.100 bb.com.br
  • {BLOCKED}.{BLOCKED}.238.100 www.bb.com.br
  • {BLOCKED}.{BLOCKED}.238.100 www.bancodobrasil.com.br
  • {BLOCKED}.{BLOCKED}.238.100 bancodobrasil.com.br
  • {BLOCKED}.{BLOCKED}.238.100 tam.com.br
  • {BLOCKED}.{BLOCKED}.238.100 www.tam.com.br
  • {BLOCKED}.{BLOCKED}.0.1 localhost
  • {BLOCKED}.{BLOCKED}.238.100 multiplusfidelidade.com.br
  • {BLOCKED}.{BLOCKED}.238.100 www.multiplusfidelidade.com.br
  • {BLOCKED}.{BLOCKED}.0.1 localhost
  • {BLOCKED}.{BLOCKED}.238.100 www.sicredi.com.br
  • {BLOCKED}.{BLOCKED}.0.1 localhost
  • {BLOCKED}.{BLOCKED}.238.100 sicredi.com.br
  • {BLOCKED}.{BLOCKED}.0.1 localhost
  • {BLOCKED}.{BLOCKED}.238.100 www.santander.com.br
  • {BLOCKED}.{BLOCKED}.238.100 www4.santander.com.br
  • {BLOCKED}.{BLOCKED}.238.100 santander.com.br
  • {BLOCKED}.{BLOCKED}.238.100 www.santandernet.com.br
  • {BLOCKED}.{BLOCKED}.238.100 santandernet.com.br
  • {BLOCKED}.{BLOCKED}.238.100 www.banespa.com.br
  • {BLOCKED}.{BLOCKED}.238.100 santanderempresarial.com.br
  • {BLOCKED}.{BLOCKED}.238.100 www.santanderempresarial.com.br
  • {BLOCKED}.{BLOCKED}.0.1 localhost
  • {BLOCKED}.{BLOCKED}.238.100 https://www.santandernetibe.com.br
  • {BLOCKED}.{BLOCKED}.238.100 www.santandernetibe.com.br
  • {BLOCKED}.{BLOCKED}.238.100 santandernetibe.com.br
  • {BLOCKED}.{BLOCKED}.238.100 http://www.bb.com.br/portalbb/home23,116,116,1,1,1,1.bb

Information Theft

This Trojan attempts to steal sensitive online banking information, such as user names and passwords. This routine risks the exposure of the user's account information, which may then lead to the unauthorized use of the stolen data.

It attempts to steal information from the following banks and/or other financial institutions:

  • Banco Bradesco
  • Banco Itau
  • Banco Santander
  • Banco do Brasil
  • Bradesco Prime
  • Multiplus
  • Prime
  • Sicredi
  • TAM

NOTES:

It accesses the URL https://{BLOCKED}y.com/124pr4 using the default browser.

However, the said URL is inaccessible as of this writing.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.536.03

FIRST VSAPI PATTERN DATE:

30 Oct 2011

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

Remove malware files dropped/downloaded by TROJ_QHOST.DMS

    ·         BAT_HOST.FK

Step 3

Remove these strings added by the malware/grayware/spyware in the HOSTS file

[ Learn More ]
    {BLOCKED}.{BLOCKED}.238.100 itauuniclass.com.br
    {BLOCKED}.{BLOCKED}.238.100 www.itauuniclass.com.br
    {BLOCKED}.{BLOCKED}.238.100 www4.itau.com.br
    {BLOCKED}.{BLOCKED}.238.100 itau.com.br
    {BLOCKED}.{BLOCKED}.238.100 www.itau.com.br
    {BLOCKED}.{BLOCKED}.238.100 www.bancoitau.com.br
    {BLOCKED}.{BLOCKED}.238.100 bancoitau.com.br
    {BLOCKED}.{BLOCKED}.238.100 www.itaupersonnalite.com.br
    {BLOCKED}.{BLOCKED}.238.100 itaupersonnalite.com.br
    {BLOCKED}.{BLOCKED}.0.1 localhost
    {BLOCKED}.{BLOCKED}.238.100 bradesco.com.br
    {BLOCKED}.{BLOCKED}.238.100 www.bradesco.com.br
    {BLOCKED}.{BLOCKED}.238.100 www4.bradesco.com.br
    {BLOCKED}.{BLOCKED}.238.100 www.prime.com.br
    {BLOCKED}.{BLOCKED}.238.100 prime.com.br
    {BLOCKED}.{BLOCKED}.238.100 www.bradescoprime.com.br
    {BLOCKED}.{BLOCKED}.238.100 bradescoprime.com.br
    {BLOCKED}.{BLOCKED}.0.1 localhost
    {BLOCKED}.{BLOCKED}.238.100 bb.com.br
    {BLOCKED}.{BLOCKED}.238.100 www.bb.com.br
    {BLOCKED}.{BLOCKED}.238.100 www.bancodobrasil.com.br
    {BLOCKED}.{BLOCKED}.238.100 bancodobrasil.com.br
    {BLOCKED}.{BLOCKED}.238.100 tam.com.br
    {BLOCKED}.{BLOCKED}.238.100 www.tam.com.br
    {BLOCKED}.{BLOCKED}.0.1 localhost
    {BLOCKED}.{BLOCKED}.238.100 multiplusfidelidade.com.br
    {BLOCKED}.{BLOCKED}.238.100 www.multiplusfidelidade.com.br
    {BLOCKED}.{BLOCKED}.0.1 localhost
    {BLOCKED}.{BLOCKED}.238.100 www.sicredi.com.br
    {BLOCKED}.{BLOCKED}.0.1 localhost
    {BLOCKED}.{BLOCKED}.238.100 sicredi.com.br
    {BLOCKED}.{BLOCKED}.0.1 localhost
    {BLOCKED}.{BLOCKED}.238.100 www.santander.com.br
    {BLOCKED}.{BLOCKED}.238.100 www4.santander.com.br
    {BLOCKED}.{BLOCKED}.238.100 santander.com.br
    {BLOCKED}.{BLOCKED}.238.100 www.santandernet.com.br
    {BLOCKED}.{BLOCKED}.238.100 santandernet.com.br
    {BLOCKED}.{BLOCKED}.238.100 www.banespa.com.br
    {BLOCKED}.{BLOCKED}.238.100 santanderempresarial.com.br
    {BLOCKED}.{BLOCKED}.238.100 www.santanderempresarial.com.br
    {BLOCKED}.{BLOCKED}.0.1 localhost
    {BLOCKED}.{BLOCKED}.238.100 https://www.santandernetibe.com.br
    {BLOCKED}.{BLOCKED}.238.100 www.santandernetibe.com.br
    {BLOCKED}.{BLOCKED}.238.100 santandernetibe.com.br
    {BLOCKED}.{BLOCKED}.238.100 http://www.bb.com.br/portalbb/home23,116,116,1,1,1,1.bb
"

Step 4

Search and delete these folders

[ 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 Temp%\5.tmp

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_QHOST.DMS. 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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