Analysis by: Jennifer Gumban
 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.

It modifies the Internet Explorer Zone Settings.

  TECHNICAL DETAILS

Tamaño del archivo 450,184 bytes
Tipo de archivo EXE
Fecha de recepción de las muestras iniciales 28 Oct 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 drops the following file(s)/component(s):

  • %Application Data%\Microsoft\Windows\FpLd6GBoSJ\FpLd6GBoSJ.dat
  • %Application Data%\Microsoft\Windows\FpLd6GBoSJ\FpLd6GBoSJ.svr

(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 drops the following copies of itself into the affected system:

  • %Application Data%\Microsoft\Windows\FpLd6GBoSJ\FpLd6GBoSJ.nfo
  • %Application Data%\ {814D18C3-95C7-4A}\uninstall.exe

(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_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
HKEY_CURRENT_USER = "%Application Data%\ {814D18C3-95C7-4A}\uninstall.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
HKEY_LOCAL_MACHINE = "%Application Data%\ {814D18C3-95C7-4A}\uninstall.exe"

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CURRENT_USER\Software\{Random Number}
Mutex = "FpLd6GBoSJ"

HKEY_CURRENT_USER\Software\FpLd6GBoSJ
FirstExecution = "{Date and Time}"

HKEY_CURRENT_USER\Software\FpLd6GBoSJ
InstalledServer = "%Application Data%\ {814D18C3-95C7-4A}\uninstall.exe"

HKEY_CURRENT_USER\Software\FpLd6GBoSJ
NewGroup = "Servers"

HKEY_CURRENT_USER\Software\FpLd6GBoSJ
NewId = "Server"

HKEY_CURRENT_USER\Software\FpLd6GBoSJ
ServerStarted = "{Date and Time}"

Web Browser Home Page and Search Page Modification

This Trojan modifies the Internet Explorer Zone Settings.

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}.9.126:3377/123456.functions
  • http://{BLOCKED}sec.org/email/asp/email.php?email=
  • http://www.{BLOCKED}er.com/serverplugin.srv
  • http://www.{BLOCKED}sting.com/tagger.php