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WORM_HILGILD_EJ1900BC.UVPM

April 25, 2020
 PLATFORM:

Windows

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

  • 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:

680,511 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

25 Apr 2020

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 adds the following processes:

  • {malware file path and name}
  • %All Users Profile%\Application Data\wmimgmt.exe
  • %System%\cmd.exe /v:on /c "%Temporary Internet Files%\ghi.bat"
  • findstr /s "YM.CGP_" "%User Profile%"\..\*.txt
  • chcp
  • net user
  • net localgroup administrators
  • tasklist
  • systeminfo
  • reg query "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer"
  • find "REG_"
  • reg query HKEY_CURRENT_USER\Software\Microsoft\Office
  • reg query HKEY_CURRENT_USER\Software\Microsoft\Office\8.0\Common\UserInfo
  • reg query HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Common\UserInfo
  • reg query HKEY_CURRENT_USER\Software\Microsoft\Office\10.0\Common\UserInfo
  • reg query HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Common\UserInfo
  • reg query HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Common\UserInfo
  • reg query HKEY_CURRENT_USER\Software\Microsoft\Office\13.0\Common\UserInfo
  • ipconfig /all
  • %System%\NETSTAT.EXE netstat -ano
  • %System%\ARP.EXE arp -a
  • %System%\NETSTAT.EXE netstat -r
  • net start
  • net use
  • %System%\cmd.exe /S /D /c" echo n"
  • net share
  • net view /domain
  • %System%\cmd.exe /S /D /c" type %Temporary Internet Files%\s.log "
  • find /i /v "------"
  • %System%\cmd.exe /S /D /c" type %Temporary Internet Files%\t.log "
  • find /i /v "domain"
  • find /i /v "\xc2\xacA\xe2\x95\x9b\xe2\x95\xa3"
  • find /i /v "\xe2\x96\x91\xe2\x8c\xa1\xc2\xaa\xc2\xb5\xc2\xaa\xc2\xbf"
  • find /i /v "\xe2\x94\x9c\xe2\x81\xbf\xe2\x94\xb4\xce\xb5"
  • find /i /v "completed successfully"
  • net view /domain:"WORKGROUP"
  • %System%\cmd.exe /S /D /c" type %Temporary Internet Files%\workgrp.tmp "
  • find "\"
  • net view \{computername}
  • find "Disk"
  • %System%\net1 user
  • %System%\net1 localgroup administrators
  • %System%\ROUTE.EXE %System%\route.exe print
  • %System%\net1 start
  • %System%\net1 share

(Note: %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit). . %Temporary Internet Files% is the Temporary Internet Files folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temporary Internet Files on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Microsoft\Windows\Temporary Internet Files on Windows Vista, 7 and 2008(64-bit), or C:\Users\{user name}\AppData\Local\Microsoft\Windows\INetCache on Windows 8, 8.1, 2012(64-bit) and 10(64-bit).. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It creates the following folders:

  • F:\RECYCLER
  • %All Users Profile%\Documents\Media

(Note: %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit). )

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
wmi32 = "%All Users Profile%\Application Data\wmimgmt.exe"

Other System Modifications

This Worm adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
explorer
GlobalAssocChangedCounter = "12"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
explorer
GlobalAssocChangedCounter = "13"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\RFC1156Agent\CurrentVersion\
Parameters
TrapPollTimeMilliSecs = "15000"

Dropping Routine

This Worm drops the following files:

  • F:\AuToRUn.iNf
  • F:\data.exe
  • F:\RECYCLER\wmimgmt.com
  • F:\RECYCLER\desktop.ini
  • %User Temp%\temp.vih
  • %All Users Profile%\Documents\Media\INFO1
  • %All Users Profile%\Application Data\wmimgmt.exe
  • F:\~thumbs.tmp

Other Details

This Worm connects to the following possibly malicious URL:

  • http://windowsupdate.{BLOCKED}oft.com

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.850

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

Restart in Safe Mode

[ Learn More ]

Step 3

Identify and terminate files detected as WORM_HILGILD_EJ1900BC.UVPM

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

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
    • wmi32 = "%All Users Profile%\Application Data\wmimgmt.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\explorer
    • GlobalAssocChangedCounter = "12"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\explorer
    • GlobalAssocChangedCounter = "13"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\RFC1156Agent\CurrentVersion\Parameters
    • TrapPollTimeMilliSecs = "15000"

Step 5

Search and delete these components

[ Learn More ]
There may be some components 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.
  • F:\AuToRUn.iNf
  • F:\data.exe
  • F:\RECYCLER\wmimgmt.com
  • F:\RECYCLER\desktop.ini
  • %User Temp%\temp.vih
  • %All Users Profile%\Documents\Media\INFO1
  • %All Users Profile%\Application Data\wmimgmt.exe
  • F:\~thumbs.tmp

Step 6

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • F:\RECYCLER
  • %All Users Profile%\Documents\Media

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_HILGILD_EJ1900BC.UVPM. 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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