BKDR_NEUTRINO.PE

April 30, 2015
 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

File Size:

172,032 bytes

File Type:

EXE

Initial Samples Received Date:

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