TROJ_STRAT.SMUM
Trojan:Win32/Startpage.KR (Microsoft); [00078014.EXE]:Generic.bfr!ey (McAfee); Trojan.Gen (Symantec); Trojan.Win32.Phires.kg (Kaspersky); Trojan.Win32.Generic!BT (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.
It deletes itself after execution.
TECHNICAL DETAILS
669,709 bytes
EXE
No
21 Oct 2012
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\TaoBao
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)
Other System Modifications
This Trojan modifies the following files:
- %Windows%\inf\intl.PNF
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
It deletes the following files:
- %Windows%\fonts\msgothic.ttf
- %Windows%\fonts\msuigoth.ttf
- %Windows%\fonts\MSMINCHO.TTF
- %Windows%\fonts\Gulim.ttf
- %Windows%\fonts\Gulimche.ttf
- %Windows%\fonts\Dotum.ttf
- %Windows%\fonts\Batang.ttf
- %Windows%\fonts\Gungsuh.ttf
- %Windows%\fonts\Simsun.ttf
- %Windows%\fonts\nsimsun.ttf
- %Windows%\fonts\MingLiU.ttf
- %Windows%\fonts\pmingliu.ttf
- %System%\SET2.tmp
- %System%\kbd101b.dll
- %System%\SET4.tmp
- %System%\kbd101c.dll
- %System%\SET6.tmp
- %System%\kbd103.dll
- %System%\SET8.tmp
- %System%\kbd106.dll
- %System%\SETA.tmp
- %System%\kbdjpn.dll
- %System%\SETC.tmp
- %System%\kbdkor.dll
- %User Temp%\$$RAR1~1.TMP
- %Desktop%.ini
- %User Profile%\QUICKL~1\Launch Internet Explorer Browser.lnk
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.. %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.. %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.. %Desktop% is the current user's desktop, which is usually C:\Windows\Profiles\{user name}\Desktop on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Desktop on Windows NT, and C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003.. %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
HKEY_CLASSES_ROOT\.ur1
HKEY_CLASSES_ROOT\.ur1\PersistentHandler
HKEY_CLASSES_ROOT\.ur1\ShellEx
HKEY_CLASSES_ROOT\.ur1\ShellEx\
{000214EE-0000-0000-C000-000000000046}
HKEY_CLASSES_ROOT\.ur1\ShellEx\
{000214F9-0000-0000-C000-000000000046}
HKEY_CLASSES_ROOT\.ur1\ShellEx\
{00021500-0000-0000-C000-000000000046}
HKEY_CLASSES_ROOT\.ur1\ShellEx\
{CABB0DA0-DA57-11CF-9974-0020AFD79762}
HKEY_CLASSES_ROOT\.ur1\ShellEx\
{FBF23B80-E3F0-101B-8488-00AA003E56F8}
HKEY_CLASSES_ROOT\.1nk
HKEY_CLASSES_ROOT\.1nk\ShellEx
HKEY_CLASSES_ROOT\.1nk\ShellEx\
{000214EE-0000-0000-C000-000000000046}
HKEY_CLASSES_ROOT\.1nk\ShellEx\
{000214F9-0000-0000-C000-000000000046}
HKEY_CLASSES_ROOT\.1nk\ShellEx\
{00021500-0000-0000-C000-000000000046}
HKEY_CLASSES_ROOT\.1nk\ShellEx\
{BB2E617C-0920-11d1-9A0B-00C04FC2D6C1}
HKEY_CLASSES_ROOT\.1nk\ShellNew
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
DontShowMeThisDialogAgain
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Enable = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Size = "a"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
InitHits = "64"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Factor = "14"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International
W2KLpk = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.1nk\ShellNew
Command = "rundll32.exe appwiz.cpl,NewLinkHere %1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
DontShowMeThisDialogAgain
CompatWarningForwwwwwww.exe = "no"
Dropping Routine
This Trojan drops the following files:
- %Windows%\regsougoupy.exe
- %Windows%\RtkSYUdp.exe
- %Program Files%\Common Files\TaoBao\ÌÔ±¦.ico
- %User Temp%\$rar10987.tmp
- %User Temp%\$rar10943.tmp
- %User Temp%\ÍøÖ·Ö®¼Ò.tmp
- %Program Files%\Common Files\TaoBao\ÌÔ±¦.tmp
- %User Temp%\hhhhhhh.tmp
- %User Temp%\$$RAR110987.tmp
- %User Temp%\wwwwwww.tmp
- %System%\SET1.tmp
- %System%\SET3.tmp
- %System%\SET5.tmp
- %System%\SET7.tmp
- %System%\SET9.tmp
- %System%\SETB.tmp
- %Program Files%\Internet Explorer\SIGNUP\wwwwwww.exe
- %System%\SET2.tmp
- %System%\SET4.tmp
- %System%\SET6.tmp
- %System%\SET8.tmp
- %System%\SETA.tmp
- %System%\SETC.tmp
Other Details
This Trojan deletes itself after execution.
This report is generated via an automated analysis system.
SOLUTION
9.300
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_CURRENT_USER\Software\Microsoft\Internet Explorer\International
- CpMRU
- In HKEY_CLASSES_ROOT
- .ur1
- In HKEY_CLASSES_ROOT\.ur1
- PersistentHandler
- In HKEY_CLASSES_ROOT\.ur1
- ShellEx
- In HKEY_CLASSES_ROOT\.ur1\ShellEx
- {000214EE-0000-0000-C000-000000000046}
- In HKEY_CLASSES_ROOT\.ur1\ShellEx
- {000214F9-0000-0000-C000-000000000046}
- In HKEY_CLASSES_ROOT\.ur1\ShellEx
- {00021500-0000-0000-C000-000000000046}
- In HKEY_CLASSES_ROOT\.ur1\ShellEx
- {CABB0DA0-DA57-11CF-9974-0020AFD79762}
- In HKEY_CLASSES_ROOT\.ur1\ShellEx
- {FBF23B80-E3F0-101B-8488-00AA003E56F8}
- In HKEY_CLASSES_ROOT
- .1nk
- In HKEY_CLASSES_ROOT\.1nk
- ShellEx
- In HKEY_CLASSES_ROOT\.1nk\ShellEx
- {000214EE-0000-0000-C000-000000000046}
- In HKEY_CLASSES_ROOT\.1nk\ShellEx
- {000214F9-0000-0000-C000-000000000046}
- In HKEY_CLASSES_ROOT\.1nk\ShellEx
- {00021500-0000-0000-C000-000000000046}
- In HKEY_CLASSES_ROOT\.1nk\ShellEx
- {BB2E617C-0920-11d1-9A0B-00C04FC2D6C1}
- In HKEY_CLASSES_ROOT\.1nk
- ShellNew
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer
- DontShowMeThisDialogAgain
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\Internet Explorer\International\CpMRU
- Enable = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
- Size = "a"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
- InitHits = "64"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
- Factor = "14"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International
- W2KLpk = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.1nk\ShellNew
- Command = "rundll32.exe appwiz.cpl,NewLinkHere %1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\DontShowMeThisDialogAgain
- CompatWarningForwwwwwww.exe = "no"
Step 4
Search and delete these files
- %Windows%\regsougoupy.exe
- %Windows%\RtkSYUdp.exe
- %Program Files%\Common Files\TaoBao\ÌÔ±¦.ico
- %User Temp%\$rar10987.tmp
- %User Temp%\$rar10943.tmp
- %User Temp%\ÍøÖ·Ö®¼Ò.tmp
- %Program Files%\Common Files\TaoBao\ÌÔ±¦.tmp
- %User Temp%\hhhhhhh.tmp
- %User Temp%\RAR110987.tmp
- %User Temp%\wwwwwww.tmp
- %System%\SET1.tmp
- %System%\SET3.tmp
- %System%\SET5.tmp
- %System%\SET7.tmp
- %System%\SET9.tmp
- %System%\SETB.tmp
- %Program Files%\Internet Explorer\SIGNUP\wwwwwww.exe
- %System%\SET2.tmp
- %System%\SET4.tmp
- %System%\SET6.tmp
- %System%\SET8.tmp
- %System%\SETA.tmp
- %System%\SETC.tmp
Note: To do a search for the following files, right-click Start then click Search... or Find..., depending on the version of Windows you are running. For each file to be deleted, type its file name in the Named input box. In the Look In drop-down list, select My Computer, then press Enter.
Step 5
Search and delete this folder
- %Program Files%\Common Files\TaoBao
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_STRAT.SMUM. 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.
- %Windows%\inf\intl.PNF
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.
- %Windows%\fonts\msgothic.ttf
- %Windows%\fonts\msuigoth.ttf
- %Windows%\fonts\MSMINCHO.TTF
- %Windows%\fonts\Gulim.ttf
- %Windows%\fonts\Gulimche.ttf
- %Windows%\fonts\Dotum.ttf
- %Windows%\fonts\Batang.ttf
- %Windows%\fonts\Gungsuh.ttf
- %Windows%\fonts\Simsun.ttf
- %Windows%\fonts\nsimsun.ttf
- %Windows%\fonts\MingLiU.ttf
- %Windows%\fonts\pmingliu.ttf
- %System%\SET2.tmp
- %System%\kbd101b.dll
- %System%\SET4.tmp
- %System%\kbd101c.dll
- %System%\SET6.tmp
- %System%\kbd103.dll
- %System%\SET8.tmp
- %System%\kbd106.dll
- %System%\SETA.tmp
- %System%\kbdjpn.dll
- %System%\SETC.tmp
- %System%\kbdkor.dll
- %User Temp%\RAR1~1.TMP
- %Desktop%.ini
- %User Profile%\QUICKL~1\Launch Internet Explorer Browser.lnk
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