Analysis by: Sabrina Lei Sioting
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Propagates via removable drives, Copies itself in all available physical drives

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

It deletes itself after execution.

  TECHNICAL DETAILS

File Size: 295,936 bytes
File Type: EXE
File Compression: UPX
Memory Resident: No
Initial Samples Received Date: 06 May 2011

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:

  • %Program Files%\Common Files\Microsoft Shared\MSInfo\Recycles.exe
  • %System%\_Recycles.exe

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

Propagation

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

  • Recycles.exe

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=Recycles.exe
shellexecute=Recycles.exe
shell\Auto\command=Recycles.exe

Other Details

This worm deletes itself after execution.

NOTES:

The dropped AUTORUN.INF file is detected by Trend Micro as MAL_OTORUN2.

  SOLUTION

Minimum Scan Engine: 8.900

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

Remove malware files dropped/downloaded by WORM_HUPIGON.EBX

    MAL_OTORUN2

Step 3

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

[ Learn More ]
 [AutoRun]
open=Recycles.exe
shellexecute=Recycles.exe
shell\Auto\command=Recycles.exe

Step 4

Scan your computer with your Trend Micro product to delete files detected as WORM_HUPIGON.EBX. 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.