TROJ_BUZUS.NEO

November 16, 2012
 Analysis by: Mark Joseph Manahan
 ALIASES:

TrojanDownloader:Win32/Neojit.A (Microsoft), Generic Downloader.nh (McAfee), Win32/Delf.OEN trojan (Eset), Downloader (Symantec)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • 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:

356,352 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

16 Nov 2012

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 copies of itself into the affected system and executes them:

  • {All User's Profile}\{random folder name}\{random filename}.exe

Autostart Technique

This Trojan creates the following registry entries to enable automatic execution of dropped component at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random} = "{All User's Profile}\{random folder name}\{random filename}.exe"

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\{random}

It adds the following registry entries:

HKEY_CURRENT_USER\Software\{random}
{random} = "{values}"

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://c.{BLOCKED}g.com.br/
  • http://w.{BLOCKED}x.com/
  • http://db.{BLOCKED}ech.com/
  • http://db.{BLOCKED}abarbosa.net/
  • http://whm2.{BLOCKED}ardo.com.br/
  • http://a.{BLOCKED}ytv.net/
  • http://{BLOCKED}7af5c3804ff2ebb150cfb8646e.twilightparadox.com/
  • http://{BLOCKED}oloko-bixo.ignorelist.com/
  • http://{BLOCKED}v.mooo.com/
  • http://{BLOCKED}a.mooo.com/
  • http://{BLOCKED}1.u147852369.codisk.com/
  • http://{BLOCKED}lo.co.cc/
  • http://{BLOCKED}f6.dyndns.org/
  • http://www.{BLOCKED}l.com.br/
  • http://{BLOCKED}.{BLOCKED}.40.61/

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.528.05

FIRST VSAPI PATTERN DATE:

16 Nov 2012

VSAPI OPR PATTERN File:

9.529.00

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Scan your computer with your Trend Micro product and note files detected as TROJ_BUZUS.NEO

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

 
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • {random} = "{All User's Profile}\{random folder name}\{random filename}.exe"

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_BUZUS.NEO. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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