WORM_HUPIGON.ASF
Backdoor:Win32/Hupigon.EC (Microsoft), Worm/AutoRun.JX (AVG), Backdoor.Hupigon.EC (Quickheal)
Windows 2000, XP, Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This worm arrives by connecting affected removable drives to a system. It may be dropped by other malware.
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
TECHNICAL DETAILS
Arrival Details
This worm arrives by connecting affected removable drives to a system.
It may be dropped by other malware.
Installation
This worm drops the following copies of itself into the affected system:
- %Program Files%\Common Files\Microsoft Shared\MSInfo\{random file name 1}
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)
It drops the following files:
- %System%\drivers\oreans32.sys
- %Program Files%\Common Files\Microsoft Shared\MSInfo\{random file name 2}.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.. %Program Files% is the default Program Files folder, usually C:\Program Files.)
Autostart Technique
This worm registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\oreans32
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{random service name}
Other System Modifications
This worm adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\{random characters}
CheckIN = "1"
Propagation
This worm drops the following copy of itself in all physical and removable drives:
- {Drive Letter}:\{random file name 1}
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected 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
Restart in Safe Mode
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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- oreans32
- oreans32
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- {random service name}
- {random service name}
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\{random characters}
- CheckIN=1
- CheckIN=1
Step 5
Search and delete this file
%Program Files%\Common Files\Microsoft Shared\MSInfo\{random file name 2}.txt
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_HUPIGON.ASF. 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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