Worm.VBS.DUNIHI.MJY

October 13, 2018
 Analysis by: Noel Anthony Llimos
 ALIASES:

HEUR:Trojan-Dropper.VBS.SDrop.gen (Kaspersky)

 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.

  TECHNICAL DETAILS

File Size:

320,535 bytes

File Type:

VBS

Memory Resident:

Yes

Initial Samples Received Date:

12 Oct 2018

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.

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
ntfsmgr = "%Program Files%\Java\jre1.8.0_111\bin\javaw.exe" -jar "%Application Data%\ntfsmgr.jar"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
(Default) = "%Program Files%\Java\jre1.8.0_111\bin\javaw.exe" -jar "%Application Data%\ntfsmgr.jar"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
EqqjUadPgo = wscript.exe //B "%Application Data%\EqqjUadPgo.vbs"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
EqqjUadPgo = wscript.exe //B "%Application Data%\EqqjUadPgo.vbs"

It drops the following files:

  • {Removable Drive}\{Malware File Name}.lnk
  • {Removable Drive}\EqqjUadPgo.vbs
  • %User Profile%\wwecsggwhi.vbs
  • %Application Data%\EqqjUadPgo.vbs
  • %Application Data%\ntfsmgr.jar

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista, 7, and 8.. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.)

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

  • %User Startup%\EqqjUadPgo.vbs

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows XP, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)

Other System Modifications

This Worm adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\EqqjUadPgo
(Default) = false - {Date of Malware Execution}

Propagation

This Worm creates shortcut files (.LNK) disguised as folders or files located on the affected drives pointing to the malware copy.

Other Details

This Worm connects to the following possibly malicious URL:

  • http://fud.f{BLOCKED}pt.c{BLOCKED}55/is-ready
  • 2{BLOCKED}83.4{BLOCKED}55

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.560.06

FIRST VSAPI PATTERN DATE:

12 Oct 2018

VSAPI OPR PATTERN File:

14.561.00

VSAPI OPR PATTERN Date:

13 Oct 2018

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 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

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • ntfsmgr = "%Program Files%\Java\jre1.8.0_111\bin\javaw.exe" -jar "%Application Data%\ntfsmgr.jar"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • (Default) = "%Program Files%\Java\jre1.8.0_111\bin\javaw.exe" -jar "%Application Data%\ntfsmgr.jar"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • EqqjUadPgo = wscript.exe //B "%Application Data%\EqqjUadPgo.vbs"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • EqqjUadPgo = wscript.exe //B "%Application Data%\EqqjUadPgo.vbs"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\EqqjUadPgo
    • (Default) = false - {Date of Malware Execution}

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.
  • {Removable Drive}\{Malware File Name}.lnk
  • {Removable Drive}\EqqjUadPgo.vbs
  • %User Profile%\wwecsggwhi.vbs
  • %Application Data%\EqqjUadPgo.vbs
  • %Application Data%\ntfsmgr.jar

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Worm.VBS.DUNIHI.MJY. 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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