Worm.VBS.SOLOW.AZ

September 04, 2024
 Analysis by: Raymart Christian Yambot
 ALIASES:

VBS/Solow.AW.worm (PANDA)

 PLATFORM:

Windows

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

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.

  TECHNICAL DETAILS

File Size:

4,098 bytes

File Type:

VBS

Memory Resident:

No

Initial Samples Received Date:

04 Sep 2024

Payload:

Drops files, Modifies system registry, Deletes files

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:

  • %Windows%\killgodzilla.vbs
  • {Drive Letter}:\killgodzilla.vbs

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

It drops the following files:

  • {Drive Letter}:\autorun.inf

Autostart Technique

This Worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
KILLMS32DLL = %Windows%\killgodzilla.vbs

Other System Modifications

This Worm modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Window Title =

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
VBSFile
DefaultIcon = %System%\WScript.exe,2

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run\
MS32DLL

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

19.570.03

FIRST VSAPI PATTERN DATE:

04 Sep 2024

VSAPI OPR PATTERN File:

19.571.00

VSAPI OPR PATTERN Date:

05 Sep 2024

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

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\Microsoft\Windows\CurrentVersion\Run
    • KILLMS32DLL = %Windows%\killgodzilla.vbs
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • Window Title
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\VBSFile
    • DefaultIcon = %System%\WScript.exe,2

Step 4

Search and delete these files

[ 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.
  • %Windows%\killgodzilla.vbs
  • {Drive Letter}:\killgodzilla.vbs
  • {Drive Letter}:\autorun.inf

Step 5

Scan your computer with your Trend Micro product to delete files detected as Worm.VBS.SOLOW.AZ. 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 the following Trend Micro Support pages for more information:


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