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TROJ_MEDFOS.BXW

May 06, 2013
 Analysis by: Anthony Joe Melgarejo
 ALIASES:

Win32/Medfos.NO 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:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Trojan may arrive bundled with malware packages as a malware component.

It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size:

761,856 bytes

File Type:

DLL

Initial Samples Received Date:

16 Apr 2013

Arrival Details

This Trojan may arrive bundled with malware packages as a malware component.

Installation

This Trojan adds the following folders:

  • %User Profile%\Application Data\Mozilla\Firefox\Profiles\{random}.default\extensions\{69508f56-a393-11e2-8274-b8ac6f996f26}
  • %User Profile%\Application Data\Mozilla\Firefox\Profiles\{random}.default\extensions\{69508f56-a393-11e2-8274-b8ac6f996f26}\chrome
  • %User Profile%\Application Data\Mozilla\Firefox\Profiles\{random}.default\extensions\{69508f56-a393-11e2-8274-b8ac6f996f26}\chrome\content

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

It drops the following files:

  • %User Profile%\Application Data\Mozilla\Firefox\Profiles\{random}.default\extensions\{69508f56-a393-11e2-8274-b8ac6f996f26}\chrome\content\browser.xul
  • %User Profile%\Application Data\Mozilla\Firefox\Profiles\{random}.default\extensions\{69508f56-a393-11e2-8274-b8ac6f996f26}\chrome.manifest
  • %User Profile%\Application Data\Mozilla\Firefox\Profiles\{random}.default\extensions\{69508f56-a393-11e2-8274-b8ac6f996f26}\install.rdf
  • %Application Data%\69508f56-a393-11e2-8274-b8ac6f996f26.crx
  • %Application Data%\Google\Chrome\Application\6.0.472.55\Extensions\69508f56-a393-11e2-8274-b8ac6f996f26.crx
  • %Application Data%\Google\Chrome\Application\6.0.472.55\Extensions\cdjbnddbclciabnckgeahmneohjlahdm.json
  • %Application Data%\Google\Chrome\Application\7.0.517.44\Extensions\69508f56-a393-11e2-8274-b8ac6f996f26.crx
  • %Application Data%\Google\Chrome\Application\7.0.517.44\Extensions\cdjbnddbclciabnckgeahmneohjlahdm.json

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

Other System Modifications

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Google\
Chrome\Extensions\cdjbnddbclciabnckgeahmneohjlahdm

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
{malware file name} = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Google\
Chrome\Extensions\cdjbnddbclciabnckgeahmneohjlahdm
path = "%User Profile%\Local Settings\Application Data\69508f56-a393-11e2-8274-b8ac6f996f26.crx"

HKEY_LOCAL_MACHINE\SOFTWARE\Google\
Chrome\Extensions\cdjbnddbclciabnckgeahmneohjlahdm
version = "1.0"

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}dvertisingfeed.com

It requires its main component to successfully perform its intended routine.