arrow_back
search
close

TROJ_MIDHOS.BY

October 07, 2013
 Analysis by: Nikko Tamana
 ALIASES:

Trojan.Win32.Midhos.cymo (Kaspersky), a variant of Win32/Medfos.XO trojan (NOD32)

 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: 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:

770,048 bytes

File Type:

DLL

Initial Samples Received Date:

27 Sep 2013

Arrival Details

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

Installation

This Trojan drops the following file(s)/component(s):

  • %Application Data%\Mozilla\Firefox\Profiles\4wwmjcqo.default\extensions\{624fdd7d-2457-11e3-8277-b8ac6f996f26}\chrome\content\browser.xul
  • %Application Data%\Mozilla\Firefox\Profiles\4wwmjcqo.default\extensions\{624fdd7d-2457-11e3-8277-b8ac6f996f26}\chrome.manifest
  • %Application Data%\Mozilla\Firefox\Profiles\4wwmjcqo.default\extensions\{624fdd7d-2457-11e3-8277-b8ac6f996f26}\install.rdf

(Note: %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.)

It creates the following folders:

  • %Application Data%\Microsoft\Protect\S-1-5-21-1614895754-436374069-682003330-1003\b1d5470d-6899-4f20-a4cd-ae0086f4a858
  • %Application Data%\Mozilla\Firefox\Profiles\4wwmjcqo.default\extensions.sqlite
  • %Application Data%\Mozilla\Firefox\Profiles\4wwmjcqo.default\extensions\{624fdd7d-2457-11e3-8277-b8ac6f996f26}
  • %Application Data%\Mozilla\Firefox\Profiles\4wwmjcqo.default\extensions\{624fdd7d-2457-11e3-8277-b8ac6f996f26}\chrome
  • %Application Data%\Mozilla\Firefox\Profiles\4wwmjcqo.default\extensions\{624fdd7d-2457-11e3-8277-b8ac6f996f26}\chrome\content

(Note: %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.)

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{Malware File Name} = "rundll32.exe {Malware Path and File Name}.dll"

Other System Modifications

This Trojan adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
{Malware File Name} = "{random letters}"

Other Details

This Trojan requires its main component to successfully perform its intended routine.