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TROJ_DLOADR.XTRM

September 08, 2014
 Analysis by: Odessy Silva
 ALIASES:

Trojan horse Zbot.IRG (AVG), W32/Injector.BDQT!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:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • 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 modifies Internet Explorer security settings. This puts the affected computer at greater risk, as it allows malicious URLs to be accessed by the computer.

  TECHNICAL DETAILS

File Size:

90,112 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

14 May 2014

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_LOCAL_MACHINE\SOFTWARE\Classes\
.max
(Default) = "Matrix.Document"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.max\ShellNew
NullFile = ""

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Matrix.Document\DefaultIcon
(Default) = "{malware path and file name},0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Matrix.Document\shell\open\
command
(Default) = "{malware path and file name} "%1""

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Matrix.Document\shell\print\
command
(Default) = "{malware path and file name} /p "%1""

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Matrix.Document\shell\printto\
command
(Default) = "{malware path and file name} /pt "%1" "%2" "%3" "%4""

HKEY_CURRENT_USER\Software\Matrix\
Recent File List

HKEY_CURRENT_USER\Software\Matrix\
Settings

Web Browser Home Page and Search Page Modification

This Trojan modifies Internet Explorer zone settings.

Download Routine

This Trojan saves the files it downloads using the following names:

  • %User Temp%\mss{up to 2 random characters}.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}rquitectura.com/attachment.pdf
  • http://www.{BLOCKED}arentechniker.de/attachment.pdf
  • http://www.{BLOCKED}etyres.co.uk/attachment.pdf
  • http://{BLOCKED}svaldebebas.com/attachment.pdf
  • http://BLOCKED}essenergy.co.uk/attachment.pdf
  • http://www.{BLOCKED}machines.nl/attachment.pdf
  • http://{BLOCKED}c.ucoz.ru/attachment.pdf
  • http://www.{BLOCKED}feirabaco.com/attachment.pdf
  • http://{BLOCKED}tas.clan.su/attachment.pdf
  • http://{BLOCKED}a.clan.su/attachment.pdf
  • http://{BLOCKED}sbydesign.uwclub.net/attachment.pdf
  • http://{BLOCKED}ausservice.de/attachment.pdf
  • http://{BLOCKED}er.do.am/attachment.pdf
  • http://{BLOCKED}l.{BLOCKED}abdl.com/attachment.pdf
  • http://{BLOCKED}din.republika.pl/attachment.pdf
  • http://{BLOCKED}ery.{BLOCKED}m3w.ch/attachment.pdf
  • http://www.{BLOCKED}ina.it/attachment.pdf
  • http://{BLOCKED}core.p0.ru/attachment.pdf
  • http://{BLOCKED}noyakata.web.fc2.com/attachment.pdf
  • http://{BLOCKED}or.{BLOCKED}2.com/web/404.html
  • http://{BLOCKED}coruxo.com/attachment.pdf
  • http://{BLOCKED}ngar.com/attachment.pdf
  • http://www.{BLOCKED}lacasadellasposa.it/attachment.pdf
  • http://{BLOCKED}iberia.com/attachment.pdf
  • http://{BLOCKED}matology.com/attachment.pdf
  • http://www.{BLOCKED}one.it/attachment.pdf
  • http://{BLOCKED}io.com/attachment.pdf
  • http://www.{BLOCKED}oehrig.de/attachment.pdf
  • http://www.{BLOCKED}4.de/attachment.pdf
  • http://www.{BLOCKED}odistefano.com/attachment.pdf
  • http://www.{BLOCKED}utoarrupe.it/attachment.pdf
  • http://{BLOCKED}5.{BLOCKED}1.47.5/attachment.pdf
  • http://{BLOCKED}sever.com/attachment.pdf
  • http://{BLOCKED}olors.web.fc2.com/attachment.pdf
  • http://{BLOCKED}r.fc2.com/web/404.html
  • http://www.{BLOCKED}lessandrocolombo.it/attachment.pdf
  • http://{BLOCKED}i0001.web.fc2.com/attachment.pdf
  • http://{BLOCKED}Oor.fc2.com/web/404.html
  • http://{BLOCKED}yt.w8w.pl/attachment.pdf
  • http://{BLOCKED}-smi.ucoz.ru/attachment.pdf
  • http://{BLOCKED}10_2s.republika.pl/attachment.pdf
  • http://{BLOCKED}ba.{BLOCKED}cities.jp/attachment.pdf
  • http://{BLOCKED}apa2005.topcities.com/attachment.pdf
  • http://www.{BLOCKED}ties.com/docs/errors/404.htm
  • http://www.{BLOCKED}ities.com/404.shtml
  • http://{BLOCKED}r.fc2.com/web/404.html

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.794.04

FIRST VSAPI PATTERN DATE:

13 May 2014

VSAPI OPR PATTERN File:

10.795.00

VSAPI OPR PATTERN Date:

14 May 2014

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

Identify and terminate files detected as TROJ_DLOADR.XTRM

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

Search and delete these files

[ 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%\mss{up to 2 random characters}.exe

Step 4

Reset Internet security settings

[ Learn More ]

Step 5

Delete this registry key

[ 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_LOCAL_MACHINE\SOFTWARE\Classes
    • .max
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • Matrix.Document
  • In HKEY_CURRENT_USER\Software
    • Matrix

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADR.XTRM. 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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