TROJ_INJECT.UNX
Trojan-Dropper.Win32.Agent.megk (Kaspersky)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
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.
It deletes itself after execution.
TECHNICAL DETAILS
118,272 bytes
EXE
Yes
08 Sep 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%\Common Files\Plugins
(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 as a system service to ensure its automatic execution at every system startup by adding the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\V3Manager\Parameters
Other System Modifications
This Trojan modifies the following file(s):
- %System%\drivers\etc\hosts
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
It deletes the following files:
- %System%\drivers\etc\hosts.del
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SvcHost
V3Manager = "{random characters}"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\V3Manager
Description = "Safe manager for V3 AntiVirius"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\V3Manager
DisplayName = "V3 Manager"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\V3Manager
ErrorControl = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\V3Manager
Group = "Com Infrastructure"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\V3Manager
ObjectName = "LocalSystem"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\V3Manager
Start = "2"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\V3Manager
Type = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\V3Manager
FailureAction = "{random values}"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\V3Manager
ImagePath = "%SystemRoot%\system32\svchost -k V3Manager"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\V3Manager\Parameters
ServiceDll = "%System%\V3Manager32.dll"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\V3Manager\Parameters
ServiceMain = "BuildMain"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DataAccess
xyz = "{malware path and file name}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DataAccess
vpn = "211.115.83.10"
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Start Page = "www.naver.com"
(Note: The default value data of the said registry entry is http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome.)
Dropping Routine
This Trojan drops the following files:
- %System%\V3Manager32.dll
- %Program Files%\Common Files\Plugins\index.txt
- %Program Files%\Common Files\Plugins\first1.bat
- %System%\kb23867.log
- %System%\drivers\etc\hosts.ics
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %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:
- http://www.{BLOCKED}o.co.kr/ahnlab/index.txt
- http://www.{BLOCKED}o.co.kr/ahnlab/first1.bat
- {BLOCKED}.25.17
It deletes itself after execution.
This report is generated via an automated analysis system.
SOLUTION
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
Restart in Safe Mode
Step 3
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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\V3Manager
- Parameters
Step 4
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\SvcHost
- V3Manager = "{random characters}"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\V3Manager
- Description = "Safe manager for V3 AntiVirius"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\V3Manager
- DisplayName = "V3 Manager"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\V3Manager
- ErrorControl = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\V3Manager
- Group = "Com Infrastructure"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\V3Manager
- ObjectName = "LocalSystem"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\V3Manager
- Start = "2"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\V3Manager
- Type = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\V3Manager
- FailureAction = "{random values}"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\V3Manager
- ImagePath = "%SystemRoot%\system32\svchost -k V3Manager"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\V3Manager\Parameters
- ServiceDll = "%System%\V3Manager32.dll"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\V3Manager\Parameters
- ServiceMain = "BuildMain"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DataAccess
- xyz = "{malware path and file name}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DataAccess
- vpn = "211.115.83.10"
Step 5
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- From: Start Page = "www.naver.com"
To: Start Page = ""http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome""
- From: Start Page = "www.naver.com"
Step 6
Search and delete these components
- %System%\V3Manager32.dll
- %Program Files%\Common Files\Plugins\index.txt
- %Program Files%\Common Files\Plugins\first1.bat
- %System%\kb23867.log
- %System%\drivers\etc\hosts.ics
Step 7
Search and delete this folder
- %Program Files%\Common Files\Plugins
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_INJECT.UNX. 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.
Step 9
Restore deleted/modified files and/or registry entries from backup
*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- %System%\drivers\etc\hosts
Step 10
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %System%\drivers\etc\hosts.del
Did this description help? Tell us how we did.