TROJ_DROPPER.DON
Trojan-Dropper.Win32.Agent.aeu (v) (Sunbelt)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
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 modifies files, disabling programs and applications from properly running.
TECHNICAL DETAILS
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.
Other System Modifications
This Trojan modifies the following files:
- %System%\ksuser.dll
- %System%\midimap.dll
(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 deletes the following files:
- %System%\dllcache\midimap.dll
- %System%\dllcache\msimg32.dll
- %System Root%\RECYCLER\4712296.tmp
- %System Root%\Recycled\4712312.tmp
- %User Temp%\tp1.tmp
- %System%\dllcache\ksuser.dll
- %System Root%\RECYCLER\4767734.tmp
- %System Root%\Recycled\4767734.tmp
(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.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Keyboard Layouts\E0200804
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Keyboard Layouts\E0200804
Ime File = "CHINASOUGOU.IME"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Keyboard Layouts\E0200804
Layout Text = "ÖÐÎÄ(Öйú)À©Õ¹"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Keyboard Layouts\E0200804
Layout File = "kbdus.dll"
It modifies the following registry entries:
HKEY_CURRENT_USER\Keyboard Layout\Preload
2 = "E0200804"
(Note: The default value data of the said registry entry is e00e0804.)
Dropping Routine
This Trojan drops the following files:
- %Program Files%\Common Files\csboy_ing_Code.ini
- %Program Files%\Common Files\AmgList.txt
- %User Temp%\Tp1.tmp
- %User Temp%\Tp2.tmp
- %User Temp%\Tp3.tmp
- %User Temp%\Tp4.tmp
- %User Temp%\Tp5.tmp
- %User Temp%\1340541356.dat
- %System%\chinasougou.ime
- %System%\sysapp10.dll
- %User Temp%\pp151kwn.exe
- %System Root%\test.bat
- %Program Files%\Common Files\mml17008.ocx
- %Program Files%\Common Files\mml99018.ocx
- %Program Files%\Common Files\00494487ce.dll
- %System%\msctfime.imebLvlD
- %System%\yuksuser.dll
- %System%\ksuser.dll
- %System%\dllcache\ksuser.dll
- %System%\yumidimap.dll
- %System%\midimap.dll
- %System%\dllcache\midimap.dll
- %System%\yumsimg32.dll
- %System%\msimg32.dll
- %System%\dllcache\msimg32.dll
- %System%\sysapp7.dll
- %User Temp%\FUCKFHcsol.exe
- %User Temp%\Help360wmgj.exe
- %System%\DllCache\msctfime.ime
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.. %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.. %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.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://hhuu.{BLOCKED}od.info:7321/huzi8.txt
- http://hhuu.{BLOCKED}s.com:7321/r8r8r8/1.exe
- http://hhuu.{BLOCKED}s.com:7321/r8r8r8/2.exe
- http://hhuu.{BLOCKED}s.com:7321/r8r8r8/3.exe
- http://hhuu.{BLOCKED}s.com:7321/r8r8r8/4.exe
- http://hhuu.{BLOCKED}s.com:7321/r8r8r8/5.exe
This report is generated via an automated analysis system.
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
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\ControlSet001\Control\Keyboard Layouts
- E0200804
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\SYSTEM\ControlSet001\Control\Keyboard Layouts\E0200804
- Ime File = "CHINASOUGOU.IME"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Keyboard Layouts\E0200804
- Layout Text = "ÖÐÎÄ(Öйú)À©Õ¹"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Keyboard Layouts\E0200804
- Layout File = "kbdus.dll"
Step 4
Restore this modified 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\Keyboard Layout\Preload
- From: 2 = "E0200804"
To: 2 = ""e00e0804""
- From: 2 = "E0200804"
Step 5
Search and delete these files
- %Program Files%\Common Files\csboy_ing_Code.ini
- %Program Files%\Common Files\AmgList.txt
- %User Temp%\Tp1.tmp
- %User Temp%\Tp2.tmp
- %User Temp%\Tp3.tmp
- %User Temp%\Tp4.tmp
- %User Temp%\Tp5.tmp
- %User Temp%\1340541356.dat
- %System%\chinasougou.ime
- %System%\sysapp10.dll
- %User Temp%\pp151kwn.exe
- %System Root%\test.bat
- %Program Files%\Common Files\mml17008.ocx
- %Program Files%\Common Files\mml99018.ocx
- %Program Files%\Common Files\00494487ce.dll
- %System%\msctfime.imebLvlD
- %System%\yuksuser.dll
- %System%\ksuser.dll
- %System%\dllcache\ksuser.dll
- %System%\yumidimap.dll
- %System%\midimap.dll
- %System%\dllcache\midimap.dll
- %System%\yumsimg32.dll
- %System%\msimg32.dll
- %System%\dllcache\msimg32.dll
- %System%\sysapp7.dll
- %User Temp%\FUCKFHcsol.exe
- %User Temp%\Help360wmgj.exe
- %System%\DllCache\msctfime.ime
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_DROPPER.DON. 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 7
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%\ksuser.dll
- %System%\midimap.dll
Step 8
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%\dllcache\midimap.dll
- %System%\dllcache\msimg32.dll
- %System Root%\RECYCLER\4712296.tmp
- %System Root%\Recycled\4712312.tmp
- %User Temp%\tp1.tmp
- %System%\dllcache\ksuser.dll
- %System Root%\RECYCLER\4767734.tmp
- %System Root%\Recycled\4767734.tmp
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