Modified by: Mark Joseph Manahan
ALIASES:

Backdoor:Win32/Hupigon.EC (Microsoft), Backdoor.Win32.Hupigon (Sunbelt), W32/Autorun.EEGS!worm (Fortinet)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This worm arrives via removable drives. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

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: 2,731,520 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 14 Nov 2012

Arrival Details

This worm arrives via removable drives.

It 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:

  • %Program Files%\Common Files\Microsoft Shared\MSInfo\Recycled.scr
  • %Program Files%\RRecycled.scr

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

Autostart Technique

This worm registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows Recycled Services
Windows Recycled Services = "%Program Files%\Common Files\Microsoft Shared\MSInfo\Recycled.scr"

It drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:

  • Recycled.vbs

Propagation

This worm drops the following copies of itself in all physical and removable drives:

  • {Drive}\Recycled.scr

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

The said .INF file contains the following strings:

[AutoRun]
open=Recycled.scr
shellexecute=Recycled.scr
shell\Auto\command=Recycled.scr

Dropping Routine

This worm drops the following files:

  • %System%\drivers\oreans32.sys

(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.)

Other Details

This worm connects to the following possibly malicious URL:

  • {BLOCKED}9158.okebox.com:9158
  • {BLOCKED}8178.okebox.com:9158
  • {BLOCKED}905.okebox.com:9158
  • {BLOCKED}5.okebox.com:9158

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.528.02
FIRST VSAPI PATTERN DATE: 14 Nov 2012
VSAPI OPR PATTERN File: 9.529.00
VSAPI OPR PATTERN Date: 15 Nov 2012

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 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\SYSTEM\CurrentControlSet\Services\Windows Recycled Services
    • Windows Recycled Services = "%Program Files%\Common Files\Microsoft Shared\MSInfo\Recycled.scr"

Step 4

Search and delete these files

[ 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.
  • %User Startup%\Recycled.vbs
  • %System%\drivers\oreans32.sys

Step 5

Search and delete AUTORUN.INF files created by WORM_HUPIGON.FQK that contain these strings

[ Learn More ]
 
  • [AutoRun]
  • open=Recycled.scr
  • shellexecute=Recycled.scr
  • shell\Auto\command=Recycled.scr

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_HUPIGON.FQK. 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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