TROJ_INJECT.BNP
Windows 2000, Windows XP, Windows Server 2003
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
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
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
Step 3
Delete this registry value
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"
- Debugger = "%System%\{random filename}.exe"
Step 4
Delete this registry key
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
- 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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