TROJ_DROPR.SMD1
TrojanDownloader:Win32/Small.AHY (Microsoft); Adware-Rugo.f. (McAfee); Adware.Rugo (Symantec); Trojan-Dropper.Win32.Agent.btrp (v) (Sunbelt); Trojan.Generic.KD.26045 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
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.
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.
Installation
This Trojan creates the following folders:
- %User Temp%\h8nil4o8
- %User Profile%\Application Data\t
- %User Profile%\t\ad
(Note: %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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
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\EventLog\Application\
Mdlea
Other System Modifications
This Trojan deletes the following files:
- %System%\e7rd.exe
- %System%\9el9.dll
- %System%\9el9.dlltmp
- %System%\2de1.dll
- %System%\b79e.dll
- %Windows%\79e7.bmp
- %Windows%\e7df.exe
- %Windows%\92b7.flv
- %Windows%\df91.rm
- %System%\2buf.exe
- %System%\dbc7.dll
- %System%\dbc7.dlltmp
- %System%\e7ab.dll
- %System%\79e7.dll
- %Windows%\1b6.bmp
- %Windows%\91b.exe
- %Windows%\f91.flv
- %Windows%\e7d.rm
- %System%\e77d.exe
- %System%\792r.dll
- %System%\792r.dlltmp
- %System%\d29s.dll
- %System%\9e7d.dll
- %Windows%\b60u.bmp
- %Windows%\f91d.exe
- %Windows%\7dfd.flv
- %Windows%\9e7a.rm
- %System%\799d.exe
- %System%\977o.dll
- %System%\977o.dlltmp
- %System%\9bee.dll
- %Windows%\1b6u.bmp
- %Windows%\f91d.flv
- %Windows%\df9a.rm
- %User Temp%\h8nil4o8\msn.exe
- %User Temp%\h8nil4o8\z.lz
- %User Temp%\h8nil4o8\_uninstall
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %Windows% is the Windows folder, which is usually C:\Windows.. %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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
It adds the following registry keys:
HKEY_CLASSES_ROOT\BHO.FunPlayer.1
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
BHO.FunPlayer.1\CLSID
HKEY_CLASSES_ROOT\BHO.FunPlayer
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
BHO.FunPlayer\CLSID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
BHO.FunPlayer\CurVer
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{7C43F4C7-D0A5-4630-BDA8-373A206178D5}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{7C43F4C7-D0A5-4630-BDA8-373A206178D5}\ProgID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{7C43F4C7-D0A5-4630-BDA8-373A206178D5}\VersionIndependentProgID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{7C43F4C7-D0A5-4630-BDA8-373A206178D5}\Programmable
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{7C43F4C7-D0A5-4630-BDA8-373A206178D5}\InprocServer32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{7C43F4C7-D0A5-4630-BDA8-373A206178D5}\TypeLib
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{A5E18DCA-F999-4836-8760-BA6140405325}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{A5E18DCA-F999-4836-8760-BA6140405325}\1.0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{A5E18DCA-F999-4836-8760-BA6140405325}\1.0\
FLAGS
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{A5E18DCA-F999-4836-8760-BA6140405325}\1.0\
0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{A5E18DCA-F999-4836-8760-BA6140405325}\1.0\
0\win32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{A5E18DCA-F999-4836-8760-BA6140405325}\1.0\
HELPDIR
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{E13128B6-B1E5-48FD-A471-E5C2255720F7}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{E13128B6-B1E5-48FD-A471-E5C2255720F7}\ProxyStubClsid
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{E13128B6-B1E5-48FD-A471-E5C2255720F7}\ProxyStubClsid32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{E13128B6-B1E5-48FD-A471-E5C2255720F7}\TypeLib
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\{A5E18DCA-F999-4836-8760-BA6140405325}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\BHO.DLL
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{7C43F4C7-D0A5-4630-BDA8-373A206178D5}\InprocServer32
ThreadingModel = "apartment"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{E13128B6-B1E5-48FD-A471-E5C2255720F7}\TypeLib
Version = "1.0"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\Application\
Mdlea
EventMessageFile = "%System%\799d.exe"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\Application\
Mdlea
TypesSupported = "7"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\Application
Sources = "{random characters}"
(Note: The default value data of the said registry entry is {random values}.)
Dropping Routine
This Trojan drops the following files:
- %User Temp%\h8nil4o8\z.lz
- %User Temp%\h8nil4o8\_uninstall
- %User Temp%\h8nil4o8\b.dll.zgx.tmp
- %User Temp%\h8nil4o8\b.dll.zgx
- %User Temp%\h8nil4o8\msn.exe.tmp
- %User Temp%\h8nil4o8\msn.exe
- %User Temp%\h8nil4o8\p.dll.zgx.tmp
- %User Temp%\h8nil4o8\p.dll.zgx
- %User Temp%\h8nil4o8\s.exe.tmp
- %User Temp%\h8nil4o8\s.exe
- %Windows%\Tasks\ms.job
- %System%\19aa
- %System%\7564-51-28
- %User Profile%\t\r1423.dat
- %User Profile%\t\b1423.dat
- %User Profile%\t\a1423.dat
- %User Profile%\t\p1423.dat
- %User Temp%\h8nil4o8\2.dll
- %User Temp%\h8nil4o8\3.dll
- %User Temp%\h8nil4o8\4.dll
- %System%\977o.dll
(Note: %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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %Windows% is the Windows folder, which is usually C:\Windows.. %System% is the Windows system folder, which is usually C:\Windows\System32.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://8475.{BLOCKED}123.cn/?{random characters}
- http://8475.{BLOCKED}123.cn/ue000/38sw.e?uid=403898357312979181299671
- http://8475.{BLOCKED}123.cn/player/blog.updata?{random characters}
- http://343.{BLOCKED}s.com/list/2012-04-18/ALL.y
- http://343.{BLOCKED}s.com/list/bl.y
This report is generated via an automated analysis system.
SOLUTION
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\EventLog\Application
- Mdlea
- In HKEY_CLASSES_ROOT
- BHO.FunPlayer.1
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\BHO.FunPlayer.1
- CLSID
- In HKEY_CLASSES_ROOT
- BHO.FunPlayer
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\BHO.FunPlayer
- CLSID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\BHO.FunPlayer
- CurVer
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
- {7C43F4C7-D0A5-4630-BDA8-373A206178D5}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{7C43F4C7-D0A5-4630-BDA8-373A206178D5}
- ProgID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{7C43F4C7-D0A5-4630-BDA8-373A206178D5}
- VersionIndependentProgID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{7C43F4C7-D0A5-4630-BDA8-373A206178D5}
- Programmable
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{7C43F4C7-D0A5-4630-BDA8-373A206178D5}
- InprocServer32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{7C43F4C7-D0A5-4630-BDA8-373A206178D5}
- TypeLib
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
- {A5E18DCA-F999-4836-8760-BA6140405325}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{A5E18DCA-F999-4836-8760-BA6140405325}
- 1.0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{A5E18DCA-F999-4836-8760-BA6140405325}\1.0
- FLAGS
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{A5E18DCA-F999-4836-8760-BA6140405325}\1.0
- 0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{A5E18DCA-F999-4836-8760-BA6140405325}\1.0\0
- win32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{A5E18DCA-F999-4836-8760-BA6140405325}\1.0
- HELPDIR
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
- {E13128B6-B1E5-48FD-A471-E5C2255720F7}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{E13128B6-B1E5-48FD-A471-E5C2255720F7}
- ProxyStubClsid
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{E13128B6-B1E5-48FD-A471-E5C2255720F7}
- ProxyStubClsid32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{E13128B6-B1E5-48FD-A471-E5C2255720F7}
- TypeLib
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID
- {A5E18DCA-F999-4836-8760-BA6140405325}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID
- BHO.DLL
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\Classes\CLSID\{7C43F4C7-D0A5-4630-BDA8-373A206178D5}\InprocServer32
- ThreadingModel = "apartment"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{E13128B6-B1E5-48FD-A471-E5C2255720F7}\TypeLib
- Version = "1.0"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\Application\Mdlea
- EventMessageFile = "%System%\799d.exe"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\Application\Mdlea
- TypesSupported = "7"
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_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\Application
- From: Sources = "{random characters}"
To: Sources = ""{random values}""
- From: Sources = "{random characters}"
Step 6
Search and delete these components
- %User Temp%\h8nil4o8\z.lz
- %User Temp%\h8nil4o8\_uninstall
- %User Temp%\h8nil4o8\b.dll.zgx.tmp
- %User Temp%\h8nil4o8\b.dll.zgx
- %User Temp%\h8nil4o8\msn.exe.tmp
- %User Temp%\h8nil4o8\msn.exe
- %User Temp%\h8nil4o8\p.dll.zgx.tmp
- %User Temp%\h8nil4o8\p.dll.zgx
- %User Temp%\h8nil4o8\s.exe.tmp
- %User Temp%\h8nil4o8\s.exe
- %Windows%\Tasks\ms.job
- %System%\19aa
- %System%\7564-51-28
- %User Profile%\t\r1423.dat
- %User Profile%\t\b1423.dat
- %User Profile%\t\a1423.dat
- %User Profile%\t\p1423.dat
- %User Temp%\h8nil4o8\2.dll
- %User Temp%\h8nil4o8\3.dll
- %User Temp%\h8nil4o8\4.dll
- %System%\977o.dll
Step 7
Search and delete these folders
- %User Temp%\h8nil4o8
- %User Profile%\Application Data\t
- %User Profile%\t\ad
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DROPR.SMD1. 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 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%\e7rd.exe
- %System%\9el9.dll
- %System%\9el9.dlltmp
- %System%\2de1.dll
- %System%\b79e.dll
- %Windows%\79e7.bmp
- %Windows%\e7df.exe
- %Windows%\92b7.flv
- %Windows%\df91.rm
- %System%\2buf.exe
- %System%\dbc7.dll
- %System%\dbc7.dlltmp
- %System%\e7ab.dll
- %System%\79e7.dll
- %Windows%\1b6.bmp
- %Windows%\91b.exe
- %Windows%\f91.flv
- %Windows%\e7d.rm
- %System%\e77d.exe
- %System%\792r.dll
- %System%\792r.dlltmp
- %System%\d29s.dll
- %System%\9e7d.dll
- %Windows%\b60u.bmp
- %Windows%\f91d.exe
- %Windows%\7dfd.flv
- %Windows%\9e7a.rm
- %System%\799d.exe
- %System%\977o.dll
- %System%\977o.dlltmp
- %System%\9bee.dll
- %Windows%\1b6u.bmp
- %Windows%\f91d.flv
- %Windows%\df9a.rm
- %User Temp%\h8nil4o8\msn.exe
- %User Temp%\h8nil4o8\z.lz
- %User Temp%\h8nil4o8\_uninstall
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