Analysis by: Pearl Charlaine Espejo
ALIASES:

TR/Neutrino.A.74 (Avira); Trojan.Win32.Agent.apjcs (Kaspersky); Downloader-FATC!AE337D53201E (McAfee)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This backdoor 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 172,032 bytes
Tipo de archivo EXE
Fecha de recepción de las muestras iniciales 28 Apr 2015

Arrival Details

This backdoor 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 backdoor drops the following copies of itself into the affected system and executes them:

  • %Application Data%\{random folder name}\{random filename}.exe

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It drops and executes the following files:

  • %User Temp%\Cab{random 4 characters}.tmp
  • %User Temp%\Tar{random 4 characters}.tmp
  • %User Temp%\{random numbers 1}.exe
  • %User Temp%\{random numbers 2}.exe

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It creates the following folders:

  • %Application Data%\{random folder name}

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random filename} = "%Application Data%\{random folder name}\{random filename}"

Other System Modifications

This backdoor adds the following registry keys:

HKEY_CURRENT_USER\Software\N3NNetwork

It adds the following registry entries:

HKEY_CURRENT_USER\Software\N3NNetwork
arr = {random}

HKEY_CURRENT_USER\Software\N3NNetwork
{random numbers 1} = "0"

HKEY_CURRENT_USER\Software\N3NNetwork
{random numbers 2} = "0"

HKEY_CURRENT_USER\Software\N3NNetwork
rate = "10"

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://{BLOCKED}ucce.com/ntrn/tasks.php
  • http://{BLOCKED}.{BLOCKED}.123.211//spread.exe
  • http://{BLOCKED}.{BLOCKED}.123.211//Pony.exe
  • http://{BLOCKED}.{BLOCKED}.123.211//ppi.exe
  • http://{BLOCKED}quyt432.com/dffgbDFGvf465/YYf.php