➔
search
close

WORM_HUPIGON.ASF

October 08, 2012
 Analysis by: Christopher Daniel So
 ALIASES:

Backdoor:Win32/Hupigon.EC (Microsoft), Worm/AutoRun.JX (AVG), Backdoor.Hupigon.EC (Quickheal)

 PLATFORM:

Windows 2000, XP, Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • 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

File Size:

Varies

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

17 Jan 2011

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

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

7.788.06

FIRST VSAPI PATTERN DATE:

23 Jan 2011

VSAPI OPR PATTERN File:

7.789.00

VSAPI OPR PATTERN Date:

23 Jan 2011

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

[ Learn More ]

Step 3

Delete this registry key

[ Learn More ]

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
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • {random service name}

Step 4

Delete this registry value

[ Learn More ]

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

Step 5

Search and delete this file

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result. %System%\drivers\oreans32.sys
%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.


Did this description help? Tell us how we did.