TROJ_HILOTI.CZG

September 10, 2013
 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

File Size:

602,112 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

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.)