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Worm.Win32.HUPIGON.E

September 02, 2022
 ALIASES:

Win32/AutoRun.Hupigon.X worm (NOD32)

 PLATFORM:

Windows

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

  • 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 deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size:

655,872 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

30 Aug 2022

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:

  • {Drive}\twunk_64.aaa
  • %System%\_twunk_64.aaa
  • %System Root%\Program Files\Common Files\Microsoft Shared\MSInfo\twunk_64.aaa

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

It drops the following files:

  • {Drive}\AutoRun.inf
  • %System Root%\Program Files\Common Files\Microsoft Shared\MSInfo\ReDelBat.bat

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

It adds the following processes:

  • %System Root%\Program Files\Common Files\Microsoft Shared\MSINFO\twunk_64.aaa
  • %System Root%\Program Files\Common Files\Microsoft Shared\MSINFO\ReDelBat.bat
  • %System%\calc.exe
  • %System Root%\Program Files\internet explorer\IEXPLORE.EXE

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Other System Modifications

This Worm deletes the following files:

  • %System Root%\Program Files\Common Files\Microsoft Shared\MSINFO\ReDelBat.bat

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

Other Details

This Worm does the following:

  • It creates the following service:
    • Service Name = Com+ Event System Log
    • ImagePath = %System Root%\Program Files\Common Files\Microsoft Shared\MSINFO\twunk_64.aaa

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

It deletes the initially executed copy of itself.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

17.782.04

FIRST VSAPI PATTERN DATE:

30 Aug 2022

VSAPI OPR PATTERN File:

17.783.00

VSAPI OPR PATTERN Date:

31 Aug 2022

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Disable this malware service

[ Learn More ]
  • Com+ Event System Log

Step 5

Search and delete this file

[ Learn More ]
There may be some 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.
  • {Drive}\twunk_64.aaa
  • %System%\_twunk_64.aaa
  • %System Root%\Program Files\Common Files\Microsoft Shared\MSInfo\twunk_64.aaa
  • {Drive}\AutoRun.inf

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Worm.Win32.HUPIGON.E. 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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