ALIASES:

RDN/Downloader.a!rj (McAfee); Found Win32/DH{gRKBEyAiIyUTJFdOYg} (AVG)

 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:

  • 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: 231,424 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 26 Jun 2014

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:

  • %Program Files%\INCAInternet
  • %Program Files%\INCAInternet\nProtect Netizen v5.2

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Autostart Technique

This Trojan registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{B87C079C-66E8-481C-8D8F-E9A486F617BF}

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{B87C079C-66E8-481C-8D8F-E9A486F617BF}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{B87C079C-66E8-481C-8D8F-E9A486F617BF}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{B87C079C-66E8-481C-8D8F-E9A486F617BF}\Implemented Categories\
{62C8FE65-4EBB-45e7-B440-6E39B2CDBF29}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{B87C079C-66E8-481C-8D8F-E9A486F617BF}\InprocServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{B87C079C-66E8-481C-8D8F-E9A486F617BF}\ProgId

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Ext\
Settings\{B87C079C-66E8-481C-8D8F-E9A486F617BF}

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{B87C079C-66E8-481C-8D8F-E9A486F617BF}
NoExplorer = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{B87C079C-66E8-481C-8D8F-E9A486F617BF}
NoExplorer = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{B87C079C-66E8-481C-8D8F-E9A486F617BF}\InprocServer32
ThreadingModel = "Both"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{B87C079C-66E8-481C-8D8F-E9A486F617BF}\InprocServer32
Class = "Entry.Loginer2"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{B87C079C-66E8-481C-8D8F-E9A486F617BF}\InprocServer32
Assembly = "test, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{B87C079C-66E8-481C-8D8F-E9A486F617BF}\InprocServer32
RuntimeVersion = "v2.0.50727"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{B87C079C-66E8-481C-8D8F-E9A486F617BF}\InprocServer32
CodeBase = "%Program Files%\INCAInternet\nProtect Netizen v5.2\npupdate.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Ext\
Settings\{B87C079C-66E8-481C-8D8F-E9A486F617BF}
Flags = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Ext\
Settings\{B87C079C-66E8-481C-8D8F-E9A486F617BF}
Version = "*"

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\Step.txt
  • %User Temp%\InstallInfo.txt
  • %Program Files%\INCAInternet\nProtect Netizen v5.2\npupdate.exe
  • %Program Files%\INCAInternet\nProtect Netizen v5.2\npupdate.exe.cfg

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}.244.147

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.700

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Close all opened browser windows

Step 3

Delete this registry key

[ 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\Explorer
    • Browser Helper Objects
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects
    • {B87C079C-66E8-481C-8D8F-E9A486F617BF}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {B87C079C-66E8-481C-8D8F-E9A486F617BF}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{B87C079C-66E8-481C-8D8F-E9A486F617BF}\Implemented Categories
    • {62C8FE65-4EBB-45e7-B440-6E39B2CDBF29}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{B87C079C-66E8-481C-8D8F-E9A486F617BF}
    • InprocServer32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{B87C079C-66E8-481C-8D8F-E9A486F617BF}
    • ProgId
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Ext\Settings
    • {B87C079C-66E8-481C-8D8F-E9A486F617BF}

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{B87C079C-66E8-481C-8D8F-E9A486F617BF}
    • NoExplorer = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{B87C079C-66E8-481C-8D8F-E9A486F617BF}
    • NoExplorer = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{B87C079C-66E8-481C-8D8F-E9A486F617BF}\InprocServer32
    • ThreadingModel = "Both"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{B87C079C-66E8-481C-8D8F-E9A486F617BF}\InprocServer32
    • Class = "Entry.Loginer2"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{B87C079C-66E8-481C-8D8F-E9A486F617BF}\InprocServer32
    • Assembly = "test, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{B87C079C-66E8-481C-8D8F-E9A486F617BF}\InprocServer32
    • RuntimeVersion = "v2.0.50727"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{B87C079C-66E8-481C-8D8F-E9A486F617BF}\InprocServer32
    • CodeBase = "%Program Files%\INCAInternet\nProtect Netizen v5.2\npupdate.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Ext\Settings\{B87C079C-66E8-481C-8D8F-E9A486F617BF}
    • Flags = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Ext\Settings\{B87C079C-66E8-481C-8D8F-E9A486F617BF}
    • Version = "*"

Step 5

Search and delete these components

[ Learn More ]
There may be some components that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %User Temp%\Step.txt
  • %User Temp%\InstallInfo.txt
  • %Program Files%\INCAInternet\nProtect Netizen v5.2\npupdate.exe
  • %Program Files%\INCAInternet\nProtect Netizen v5.2\npupdate.exe.cfg

Step 6

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %Program Files%\INCAInternet
  • %Program Files%\INCAInternet\nProtect Netizen v5.2

Step 7

Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOAD.TEYHQ. 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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