TROJ_BHO.KS
TrojanDownloader:Win32/Renos.FS (Microsoft); [0000cf00.EXE]:Generic.dx (McAfee); Trojan.Win32.BHO.hxk (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.1152951 (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
181,262 bytes
EXE
No
15 Nov 2011
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 Profile%\Microsoft\Dr Watson
(Note: %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.)
Autostart Technique
This Trojan registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{BC354443-937D-498B-A792-B6E388CDFCE6}
Other System Modifications
This Trojan deletes the following files:
- %Windows%\k.txt
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Bind
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects
HKEY_CLASSES_ROOT\NinoGer
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
NinoGer\CLSID
HKEY_CLASSES_ROOT\sdx12q.Bho
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
sdx12q.Bho\CLSID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
sdx12q.Bho\CurVer
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{BC354443-937D-498B-A792-B6E388CDFCE6}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{BC354443-937D-498B-A792-B6E388CDFCE6}\ProgID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{BC354443-937D-498B-A792-B6E388CDFCE6}\VersionIndependentProgID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{BC354443-937D-498B-A792-B6E388CDFCE6}\Programmable
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{BC354443-937D-498B-A792-B6E388CDFCE6}\InprocServer32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{BC354443-937D-498B-A792-B6E388CDFCE6}\TypeLib
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{10026069-7A5F-4531-811E-C8DF20643BEE}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{10026069-7A5F-4531-811E-C8DF20643BEE}\1.0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{10026069-7A5F-4531-811E-C8DF20643BEE}\1.0\
FLAGS
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{10026069-7A5F-4531-811E-C8DF20643BEE}\1.0\
0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{10026069-7A5F-4531-811E-C8DF20643BEE}\1.0\
0\win32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{10026069-7A5F-4531-811E-C8DF20643BEE}\1.0\
HELPDIR
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{B31F9EF2-40D0-4F3E-9334-502C709DDC57}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{B31F9EF2-40D0-4F3E-9334-502C709DDC57}\ProxyStubClsid
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{B31F9EF2-40D0-4F3E-9334-502C709DDC57}\ProxyStubClsid32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{B31F9EF2-40D0-4F3E-9334-502C709DDC57}\TypeLib
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{D76FBC4F-5E07-41FA-9013-FA3A53E46B95}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{D76FBC4F-5E07-41FA-9013-FA3A53E46B95}\ProxyStubClsid
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{D76FBC4F-5E07-41FA-9013-FA3A53E46B95}\ProxyStubClsid32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{D76FBC4F-5E07-41FA-9013-FA3A53E46B95}\TypeLib
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{BC354443-937D-498B-A792-B6E388CDFCE6}\InprocServer32
ThreadingModel = "Apartment"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{B31F9EF2-40D0-4F3E-9334-502C709DDC57}\TypeLib
Version = "1.0"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{D76FBC4F-5E07-41FA-9013-FA3A53E46B95}\TypeLib
Version = "1.0"
HKEY_CURRENT_USER\Software\Microsoft\
Bind
2011117 = "1"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DrWatson
NumberOfCrashes = "1"
(Note: The default value data of the said registry entry is 0.)
It deletes the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
PCHealth\ErrorReporting\DW
Dropping Routine
This Trojan drops the following files:
- %System%\dipynxx2.dll
- %System%\p.ico
- %Desktop%\SMS TRAP.url
- %Favorites%\SMS TRAP.url
- %Start Menu%\SMS TRAP.url
- %System%\c.ico
- %Desktop%\VIP Casino.url
- %Favorites%\VIP Casino.url
- %Start Menu%\VIP Casino.url
- %System%\m.ico
- %Desktop%\Cheap Pharmacy Online.url
- %Favorites%\Cheap Pharmacy Online.url
- %Start Menu%\Cheap Pharmacy Online.url
- %System%\s.ico
- %Desktop%\Search Online.url
- %Favorites%\Search Online.url
- %Start Menu%\Search Online.url
- %User Temp%\P1.tmp
- %User Temp%\ieE668.tmp
- %User Profile%\Dr Watson\drwtsn32.log
- %User Profile%\Dr Watson\user.dmp
- %Windows%\k.txt
(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.. %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.. %Favorites% is the current user's Favorites folder, which is usually C:\Windows\Favorites on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Favorites on Windows NT, and C:\Documents and Settings\{user name}\Favorites on Windows 2000, XP, and Server 2003.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Profiles\{user name}\Start Menu on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu on Windows NT and C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, 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.. %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.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}linkbindinstaller.com/cfg1.php?id=
This report is generated via an automated analysis system.
SOLUTION
9.200
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
Close all opened browser windows
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_CURRENT_USER\Software\Microsoft
- Bind
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer
- Browser Helper Objects
- In HKEY_CLASSES_ROOT
- NinoGer
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\NinoGer
- CLSID
- In HKEY_CLASSES_ROOT
- sdx12q.Bho
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\sdx12q.Bho
- CLSID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\sdx12q.Bho
- CurVer
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
- {BC354443-937D-498B-A792-B6E388CDFCE6}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{BC354443-937D-498B-A792-B6E388CDFCE6}
- ProgID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{BC354443-937D-498B-A792-B6E388CDFCE6}
- VersionIndependentProgID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{BC354443-937D-498B-A792-B6E388CDFCE6}
- Programmable
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{BC354443-937D-498B-A792-B6E388CDFCE6}
- InprocServer32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{BC354443-937D-498B-A792-B6E388CDFCE6}
- TypeLib
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
- {10026069-7A5F-4531-811E-C8DF20643BEE}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{10026069-7A5F-4531-811E-C8DF20643BEE}
- 1.0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{10026069-7A5F-4531-811E-C8DF20643BEE}\1.0
- FLAGS
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{10026069-7A5F-4531-811E-C8DF20643BEE}\1.0
- 0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{10026069-7A5F-4531-811E-C8DF20643BEE}\1.0\0
- win32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{10026069-7A5F-4531-811E-C8DF20643BEE}\1.0
- HELPDIR
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
- {B31F9EF2-40D0-4F3E-9334-502C709DDC57}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{B31F9EF2-40D0-4F3E-9334-502C709DDC57}
- ProxyStubClsid
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{B31F9EF2-40D0-4F3E-9334-502C709DDC57}
- ProxyStubClsid32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{B31F9EF2-40D0-4F3E-9334-502C709DDC57}
- TypeLib
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
- {D76FBC4F-5E07-41FA-9013-FA3A53E46B95}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{D76FBC4F-5E07-41FA-9013-FA3A53E46B95}
- ProxyStubClsid
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{D76FBC4F-5E07-41FA-9013-FA3A53E46B95}
- ProxyStubClsid32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{D76FBC4F-5E07-41FA-9013-FA3A53E46B95}
- TypeLib
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\{BC354443-937D-498B-A792-B6E388CDFCE6}\InprocServer32
- ThreadingModel = "Apartment"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{B31F9EF2-40D0-4F3E-9334-502C709DDC57}\TypeLib
- Version = "1.0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{D76FBC4F-5E07-41FA-9013-FA3A53E46B95}\TypeLib
- Version = "1.0"
- In HKEY_CURRENT_USER\Software\Microsoft\Bind
- 2011117 = "1"
Step 5
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_LOCAL_MACHINE\SOFTWARE\Microsoft\DrWatson
- From: NumberOfCrashes = "1"
To: NumberOfCrashes = "0"
- From: NumberOfCrashes = "1"
Step 6
Search and delete this folder
- %User Profile%\Microsoft\Dr Watson
Step 7
Search and delete these files
- %System%\dipynxx2.dll
- %System%\p.ico
- %Desktop%\SMS TRAP.url
- %Favorites%\SMS TRAP.url
- %Start Menu%\SMS TRAP.url
- %System%\c.ico
- %Desktop%\VIP Casino.url
- %Favorites%\VIP Casino.url
- %Start Menu%\VIP Casino.url
- %System%\m.ico
- %Desktop%\Cheap Pharmacy Online.url
- %Favorites%\Cheap Pharmacy Online.url
- %Start Menu%\Cheap Pharmacy Online.url
- %System%\s.ico
- %Desktop%\Search Online.url
- %Favorites%\Search Online.url
- %Start Menu%\Search Online.url
- %User Temp%\P1.tmp
- %User Temp%\ieE668.tmp
- %User Profile%\Dr Watson\drwtsn32.log
- %User Profile%\Dr Watson\user.dmp
- %Windows%\k.txt
Step 8
Scan your computer with your Trend Micro product to delete files detected as TROJ_BHO.KS. 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.
- %Windows%\k.txt
Step 10
Restore these deleted registry keys/values from backup
*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\PCHealth\ErrorReporting
- DW
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