Analysis by: Jimelle Monteser
 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 arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

Tamaño del archivo 602,112 bytes
Tipo de archivo DLL
Residente en memoria Yes
Fecha de recepción de las muestras iniciales 10 Sep 2013

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.

Installation

This Trojan creates the following folders:

  • %Application Data%\Mozilla\Firefox\Profiles\4wwmjcqo.default\extensions\{CLSID}
  • %Application Data%\Mozilla\Firefox\Profiles\4wwmjcqo.default\extensions\{CLSID}\chrome
  • %Application Data%\Mozilla\Firefox\Profiles\4wwmjcqo.default\extensions\{CLSID}\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 filename} = "rundll32.exe {malware path}\{malware filename}.dll,#1"

Other System Modifications

This Trojan adds the following registry entries:

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

Dropping Routine

This Trojan drops the following files:

  • %Application Data%\Mozilla\Firefox\Profiles\4wwmjcqo.default\extension.sqlite
  • %Application Data%\Mozilla\Firefox\Profiles\4wwmjcqo.default\extensions\{CLSID}\chrome\chrome.manifest
  • %Application Data%\Mozilla\Firefox\Profiles\4wwmjcqo.default\extensions\{CLSID}\chrome\install.rdf
  • %Application Data%\Mozilla\Firefox\Profiles\4wwmjcqo.default\extensions\{CLSID}\chrome\content\browser.xul

(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.)