BKDR_HUPIGON.DCM
VirTool:Win32/DelfInject.gen!X, PWS:Win32/Hupigon.AAA (Microsoft); [3.nsis\3.nsis]:BackDoor-AWQ.gen.aq (McAfee); ARC:NSIS, PAK:[??QQ???????? 3.1.exe]:ASPack, PAK:[SYSTEM.exe]:UPX, [SYSTEM.exe]:Backdoor.Win32.Hupig (Kaspersky); BehavesLike.Win32.Malware.bsf (vs) (Sunbelt); Trojan:W32/Agent.DQRS (FSecure)
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
823,086 bytes
EXE
No
15 Apr 2012
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
(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:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
Other System Modifications
This backdoor deletes the following files:
- %User Temp%\nsv1.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.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Multimedia\DrawDib
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Multimedia\DrawDib
vga.drv 1024x768x32(BGR 0) = "31,31,31,31"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Check_Associations = "no"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
Name = "ºìµ¥QQ¿Õ¼äÈ«ÄÜÍõ 3.1.exe"
(Note: The default value data of the said registry entry is iexplore.exe.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
ID = "4f86c28"
(Note: The default value data of the said registry entry is 41107b81.)
HKEY_CURRENT_USER\Software\Microsoft\
Internet Connection Wizard
Completed = "{random values}"
(Note: The default value data of the said registry entry is 1.)
Dropping Routine
This backdoor drops the following files:
- %User Temp%\ºìµ¥QQ¿Õ¼äÈ«ÄÜÍõ 3.1.exe
- %User Temp%\SYSTEM.exe
- %Windows%\RAV2007.BAT
- %Windows%\Wtool.DLL
- %Windows%\Wtool.exe
(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.)
Other Details
This backdoor connects to the following possibly malicious URL:
- http://hi.{BLOCKED}u.com/{random path}
This report is generated via an automated analysis system.
SOLUTION
9.200
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_CURRENT_USER\Software\Microsoft\Multimedia
- DrawDib
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\Multimedia\DrawDib
- vga.drv 1024x768x32(BGR 0) = "31,31,31,31"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- Check_Associations = "no"
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 = "ºìµ¥QQ¿Õ¼äÈ«ÄÜÍõ 3.1.exe"
To: Name = ""iexplore.exe""
- From: Name = "ºìµ¥QQ¿Õ¼äÈ«ÄÜÍõ 3.1.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
- From: ID = "4f86c28"
To: ID = ""41107b81""
- From: ID = "4f86c28"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Connection Wizard
- From: Completed = "{random values}"
To: Completed = ""1""
- From: Completed = "{random values}"
Step 5
Search and delete these components
- %User Temp%\ºìµ¥QQ¿Õ¼äÈ«ÄÜÍõ 3.1.exe
- %User Temp%\SYSTEM.exe
- %Windows%\RAV2007.BAT
- %Windows%\Wtool.DLL
- %Windows%\Wtool.exe
Step 6
Search and delete these folders
- %System Root%\DOCUME~1
- %System Root%\DOCUME~1\ADMINI~1
- %User Profile%\LOCALS~1
Step 7
Scan your computer with your Trend Micro product to delete files detected as BKDR_HUPIGON.DCM. 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%\nsv1.tmp
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