TROJ_INJECT.BNP

October 09, 2012
 Analysis by: Kathleen Notario
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size:

131,072 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

24 Jan 2012

Payload:

Connects to URLs/IPs

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

Installation

This Trojan drops the following copies of itself into the affected system:

  • %System%\{random filename}.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • B78B6046

It injects itself into the following processes as part of its memory residency routine:

  • csrss.exe
  • thebat.exe
  • msimn.exe
  • iexplore.exe
  • explorer.exe
  • myie.exe
  • firefox.exe
  • mozilla.exe
  • avant.exe
  • maxthon.exe
  • OUTLOOK.EXE
  • ftpte.exe
  • coreftp.exe
  • filezilla.exe
  • TOTALCMD.EXE
  • cftp.exe
  • FTPVoyager.exe
  • SmartFTP.exe
  • WinSCP.exe

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
userinit.exe
Debugger = "%System%\{random filename}.exe"

Other System Modifications

This Trojan adds the following registry keys as part of its installation routine:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Internet Settings\
5.0\203E7401

Other Details

This Trojan deletes the initially executed copy of itself

NOTES:

It connects to the following URLs to report system infection and send information such as OS version and IP address:

  • {BLOCKED}obvybeydo.net
  • {BLOCKED}fytbehyupr.com
  • {BLOCKED}pjwtgevaw.net
  • {BLOCKED}ojetgbpaqd.com
  • {BLOCKED}bupjwixvyw.net
  • {BLOCKED}btcoktwvad.net

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.730.04

FIRST VSAPI PATTERN DATE:

24 Jan 2012

VSAPI OPR PATTERN File:

8.731.00

VSAPI OPR PATTERN Date:

25 Jan 2012

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

Identify and delete files detected as TROJ_INJECT.BNP using either the Startup Disk or Recovery Console

[ Learn More ]

Step 3

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 NT\CurrentVersion\Image File Execution Options\userinit.exe
    • Debugger = "%System%\{random filename}.exe"

Step 4

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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\5.0
    • 203E7401

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_INJECT.BNP. 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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