TROJ_DROPR.SMIL
Trojan:Win32/Startpage.NT (Microsoft); StartPage-NK (McAfee); Trojan.Gen (Symantec); Trojan.Win32.Oficla.ocu (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Dropped:Trojan.Generic.6150491 (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:
- %System Root%\Program Files\WinRAR
- %User Temp%\is-SP1B7.tmp
- %User Temp%\is-E6S7S.tmp
- %User Temp%\is-E6S7S.tmp\_isetup
(Note: %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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
Other System Modifications
This Trojan deletes the following files:
- %User Temp%\bibibei.exe
- %User Temp%\jm_setup_qvod.exe
- %User Temp%\setup_p55.exe
- %User Temp%\pipi_dae_484.exe
- %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%\SET3.tmp
- %System%\kbd101b.dll
- %System%\SET2.tmp
- %System%\SET5.tmp
- %System%\kbd101c.dll
- %System%\SET4.tmp
- %System%\SET7.tmp
- %System%\kbd103.dll
- %System%\SET6.tmp
- %System%\SET9.tmp
- %System%\kbd106.dll
- %System%\SET8.tmp
- %System%\SETB.tmp
- %System%\kbdjpn.dll
- %System%\SETA.tmp
- %System%\SETD.tmp
- %System%\kbdkor.dll
- %System%\SETC.tmp
- {malware path and file name}
(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.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\WinRAR
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\WinRAR
vvs120 = "modenfvvs120"
HKEY_LOCAL_MACHINE\SOFTWARE\WinRAR
uid = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\WinRAR
uname = "system"
HKEY_LOCAL_MACHINE\SOFTWARE\WinRAR
udate = "9_29"
HKEY_LOCAL_MACHINE\SOFTWARE\WinRAR
hp = {random values}
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
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
Name = "iexplore.exe"
(Note: The default value data of the said registry entry is mshta.exe.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
ID = 4117b81
(Note: The default value data of the said registry entry is 41107b3f.)
Dropping Routine
This Trojan drops the following files:
- %User Temp%\inlink-verycm.tmp
- %System Root%\Program Files\WinRAR\winRarExt64.dat
- %User Temp%\ins1.tmp
- %User Temp%\desktop_url.cab
- %User Temp%\favorites_url.cab
- %User Temp%\jm_setup_qvod.exe
- %User Temp%\pipi_dae_484.exe
- %System%\SET2.tmp
- %System%\SET4.tmp
- %System%\SET6.tmp
- %System%\SET8.tmp
- %System%\SETA.tmp
- %System%\SETC.tmp
- %User Temp%\is-SP1B7.tmp\jm_setup_qvod.tmp
- %User Temp%\is-E6S7S.tmp\_isetup\_RegDLL.tmp
- %User Temp%\is-E6S7S.tmp\_isetup\_shfoldr.dll
- %System%\SET3.tmp
- %System%\SET5.tmp
- %System%\SET7.tmp
- %System%\SET9.tmp
- %System%\SETB.tmp
- %System%\SETD.tmp
(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.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %System% is the Windows system folder, which is usually C:\Windows\System32.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://www.{BLOCKED}100.com/msn/software/partner/w/bibibei.exe
- http://qkankan.{BLOCKED}g.cn/jm_setup_qvod.exe
- http://exe.{BLOCKED}g.cn/setup_p55.exe
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
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\SOFTWARE
- WinRAR
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International
- CpMRU
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\SOFTWARE\WinRAR
- vvs120="modenfvvs120"
- In HKEY_LOCAL_MACHINE\SOFTWARE\WinRAR
- uid="0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\WinRAR
- uname="system"
- In HKEY_LOCAL_MACHINE\SOFTWARE\WinRAR
- udate="9_29"
- In HKEY_LOCAL_MACHINE\SOFTWARE\WinRAR
- hp={random values}
- 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
Step 4
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\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
- From: Name="iexplore.exe"
To: Name=mshta.exe
- From: Name="iexplore.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
- From: ID=4117b81
To: ID=41107b3f
- From: ID=4117b81
Step 5
Search and delete these folders
- %System Root%\Program Files\WinRAR
- %User Temp%\is-SP1B7.tmp
- %User Temp%\is-E6S7S.tmp
- %User Temp%\is-E6S7S.tmp\_isetup
Step 6
Search and delete these files
- %User Temp%\inlink-verycm.tmp
- %System Root%\Program Files\WinRAR\winRarExt64.dat
- %User Temp%\ins1.tmp
- %User Temp%\desktop_url.cab
- %User Temp%\favorites_url.cab
- %User Temp%\jm_setup_qvod.exe
- %User Temp%\pipi_dae_484.exe
- %System%\SET2.tmp
- %System%\SET4.tmp
- %System%\SET6.tmp
- %System%\SET8.tmp
- %System%\SETA.tmp
- %System%\SETC.tmp
- %User Temp%\is-SP1B7.tmp\jm_setup_qvod.tmp
- %User Temp%\is-E6S7S.tmp\_isetup\_RegDLL.tmp
- %User Temp%\is-E6S7S.tmp\_isetup\_shfoldr.dll
- %System%\SET3.tmp
- %System%\SET5.tmp
- %System%\SET7.tmp
- %System%\SET9.tmp
- %System%\SETB.tmp
- %System%\SETD.tmp
Step 7
Scan your computer with your Trend Micro product to delete files detected as TROJ_DROPR.SMIL. 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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