WORM_HUPIGON.NGZ
Backdoor:Win32/Hupigon (Microsoft); W32.Pasobir (Symantec); Backdoor.Win32.Hupigon.fba (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse BackDoor.Hupigon5.AXTO (AVG)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It disables Task Manager, Registry Editor, and Folder Options.
TECHNICAL DETAILS
577,536 bytes
EXE
No
23 Jul 2013
Arrival Details
This worm 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 worm drops the following copies of itself into the affected system:
- %System%\services.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
Other System Modifications
This worm adds the following registry keys:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
HKEY_CLASSES_ROOT\.sm1
HKEY_CLASSES_ROOT\sm1_Auto_File
HKEY_CLASSES_ROOT\sm1_Auto_File\shell\
open\command
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"
It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
AudioMan = "%System%\Explorer.sm1"
Dropping Routine
This worm drops the following files:
- %System%\Explorer.sm1
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
This report is generated via an automated analysis system.
SOLUTION
9.300
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
Enable Registry Editor, Task Manager, and Folder options
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\Windows\CurrentVersion\Policies\Explorer
- Run
- In HKEY_CLASSES_ROOT
- .sm1
- In HKEY_CLASSES_ROOT
- sm1_Auto_File
- In HKEY_CLASSES_ROOT\sm1_Auto_File\shell\open
- command
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- ShowSuperHidden = "0"
Step 5
Search and delete this file
- %System%\Explorer.sm1
Step 6
Scan your computer with your Trend Micro product to delete files detected as WORM_HUPIGON.NGZ. 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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