BKDR_GOOMHTTP.HD
Trojan:Win32/Orsam!rts (Microsoft); [83.nsis]:BackDoor-DRV.gen.c (McAfee); ARC:NSIS, PAK:[$PLUGINSDIR\nsRandom.dll]:UPX, ARC:[QQ????????????.exe]:Embedded (Kaspersky); Backdoor.Win32.FlyAgent.h (v) (Sunbelt)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This backdoor 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 backdoor 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 backdoor creates the following folders:
- %System Root%\DOCUME~1
- %System Root%\DOCUME~1\ADMINI~1
- %User Profile%\LOCALS~1
- %User Temp%\nsk3.tmp
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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.. %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.)
Other System Modifications
This backdoor deletes the following files:
- %User Temp%\nsp1.tmp
- %User Temp%\nsk3.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.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
MenuOrder\Favorites\Á´½Ó
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
MenuOrder\Start Menu2\Programs\
Æô¶¯
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Ext\
Stats\{E2E2DD38-D088-4134-82B7-F2BA38496583}\iexplore
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Shell Extensions\
Cached
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
MenuOrder\Favorites
Order = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
MenuOrder\Favorites\Á´½Ó
Order = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
MenuOrder\Start Menu2\Programs\
Æô¶¯
Order = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Ext\
Stats\{E2E2DD38-D088-4134-82B7-F2BA38496583}\iexplore
Count = "7"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Ext\
Stats\{E2E2DD38-D088-4134-82B7-F2BA38496583}\iexplore
Time = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Shell Extensions\
Cached
{random string} = "{random values}"
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
MenuOrder\Start Menu2\Programs
Order = "{random values}"
(Note: The default value data of the said registry entry is {random values}.)
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Toolbar\WebBrowser
{0E5CBF21-D15F-11D0-8301-00AA005B4383} = "{random values}"
(Note: The default value data of the said registry entry is {random values}.)
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Toolbar\WebBrowser
ITBarLayout = "{random values}"
(Note: The default value data of the said registry entry is {random values}.)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Ext\
Stats\{FB5F1910-F110-11D2-BB9E-00C04F795683}\iexplore
Count = "7"
(Note: The default value data of the said registry entry is 2.)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Ext\
Stats\{FB5F1910-F110-11D2-BB9E-00C04F795683}\iexplore
Time = "{random values}"
(Note: The default value data of the said registry entry is {random values}.)
Dropping Routine
This backdoor drops the following files:
- %User Temp%\nse2.tmp
- %User Temp%\nsk3.tmp\ioSpecial.ini
- %User Temp%\nsk3.tmp\modern-wizard.bmp
- %User Temp%\nsk3.tmp\modern-header.bmp
- %User Temp%\nsk3.tmp\BrandingURL.dll
- %User Temp%\nsk3.tmp\InstallOptions.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.)
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\Favorites
- Á´½Ó
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\Start Menu2\Programs
- Æô¶¯
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Ext\Stats\{E2E2DD38-D088-4134-82B7-F2BA38496583}
- iexplore
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Shell Extensions
- Cached
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\Windows\CurrentVersion\Explorer\MenuOrder\Favorites
- Order = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\Favorites\Á´½Ó
- Order = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\Start Menu2\Programs\Æô¶¯
- Order = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Ext\Stats\{E2E2DD38-D088-4134-82B7-F2BA38496583}\iexplore
- Count = "7"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Ext\Stats\{E2E2DD38-D088-4134-82B7-F2BA38496583}\iexplore
- Time = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Shell Extensions\Cached
- {random string} = "{random values}"
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\Software\Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\Start Menu2\Programs
- From: Order = "{random values}"
To: Order = ""{random values}""
- From: Order = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Toolbar\WebBrowser
- From: {0E5CBF21-D15F-11D0-8301-00AA005B4383} = "{random values}"
To: {0E5CBF21-D15F-11D0-8301-00AA005B4383} = ""{random values}""
- From: {0E5CBF21-D15F-11D0-8301-00AA005B4383} = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Toolbar\WebBrowser
- From: ITBarLayout = "{random values}"
To: ITBarLayout = ""{random values}""
- From: ITBarLayout = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Ext\Stats\{FB5F1910-F110-11D2-BB9E-00C04F795683}\iexplore
- From: Count = "7"
To: Count = ""2""
- From: Count = "7"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Ext\Stats\{FB5F1910-F110-11D2-BB9E-00C04F795683}\iexplore
- From: Time = "{random values}"
To: Time = ""{random values}""
- From: Time = "{random values}"
Step 5
Search and delete these files
- %User Temp%\nse2.tmp
- %User Temp%\nsk3.tmp\ioSpecial.ini
- %User Temp%\nsk3.tmp\modern-wizard.bmp
- %User Temp%\nsk3.tmp\modern-header.bmp
- %User Temp%\nsk3.tmp\BrandingURL.dll
- %User Temp%\nsk3.tmp\InstallOptions.dll
Step 6
Search and delete these folders
- %System Root%\DOCUME~1
- %System Root%\DOCUME~1\ADMINI~1
- %User Profile%\LOCALS~1
- %User Temp%\nsk3.tmp
Step 7
Scan your computer with your Trend Micro product to delete files detected as BKDR_GOOMHTTP.HD. 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 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.
- %User Temp%\nsp1.tmp
- %User Temp%\nsk3.tmp
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