TROJ_INJECT.ES
Kaspersky: Trojan.Win32.Buzus.gxej
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This Trojan may be downloaded by other malware/grayware/spyware from remote sites. It may be unknowingly downloaded by a user while visiting malicious websites.
It deletes itself after execution.
TECHNICAL DETAILS
Arrival Details
This Trojan may be downloaded by other malware/grayware/spyware from remote sites.
It may be unknowingly downloaded by a user while visiting malicious websites.
Installation
This Trojan drops the following non-malicious files:
- %Current%\tl 1300-0014.doc
- %Current%\{malware filename}.exe.bat
It drops the following copies of itself into the affected system:
- %Program Files%\Microsoft\winhosts.exe
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)
It injects threads into the following normal process(es):
- iexplore.exe
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Microsoft Office = "%Program Files%\Microsoft\winhosts.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Microsoft Office = "%Program Files%\Microsoft\winhosts.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{161773E5-5567-0C2C-5ED0-E1CAA4CD2A9E}
StubPath = %System%\ysconfiging.exe
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{161773E5-5567-0C2C-5ED0-E1CAA4CD2A9E}
It adds the following registry entries as part of its installation routine:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{YQJRKPOF-1WOJ-M311-06GK-5TA6F41B1560}
StubPath = "%Program Files%\Microsoft\winhosts.exe restart"
Dropping Routine
This Trojan drops the following files:
- %System%\ysconfiging.exe - also detected as TROJ_INJECT.ES
(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.)
Other Details
This Trojan connects to the following possibly malicious URL:
- {BLOCKED}7.mydynip.net
It deletes itself after execution.
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
Restart in Safe Mode
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Microsoft Office = %Program Files%\Microsoft\winhosts.exe
- Microsoft Office = %Program Files%\Microsoft\winhosts.exe
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- Microsoft Office = %Program Files%\Microsoft\winhosts.exe
- Microsoft Office = %Program Files%\Microsoft\winhosts.exe
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{161773E5-5567-0C2C-5ED0-E1CAA4CD2A9E}
- StubPath = %System%\ysconfiging.exe
- StubPath = %System%\ysconfiging.exe
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{YQJRKPOF-1WOJ-M311-06GK-5TA6F41B1560}
- StubPath = %Program Files%\Microsoft\winhosts.exe restart
- StubPath = %Program Files%\Microsoft\winhosts.exe restart
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.
- In HKEY_CURRENT_USER\Software
- Local AppWizard-Generated Applications
- Local AppWizard-Generated Applications
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components
- {161773E5-5567-0C2C-5ED0-E1CAA4CD2A9E}
- {161773E5-5567-0C2C-5ED0-E1CAA4CD2A9E}
Step 5
Search and delete these files
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_INJECT.ES. 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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