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Virus.Win32.VIRUX.B

July 15, 2020
 Analysis by: Mohammed Malubay
 ALIASES:

Virus:Win32/Virut.BO(MICROSOFT); Virus.Win32.Virut.ce(KASPERSKY); Win32/Virut.NBP virus(NOD32);

 PLATFORM:

Windows

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

  • Threat Type: Virus

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet


This Virus arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It connects to certain websites to send and receive information. It prevents users from visiting antivirus-related websites that contain specific strings.

  TECHNICAL DETAILS

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

14 Jul 2020

Payload:

Connects to URLs/IPs, Steals information

Arrival Details

This Virus 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 Virus injects codes into the following process(es):

  • winlogon.exe

Other System Modifications

This Virus adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%System%\winlogon.exe = %System%\winlogon.exe:*:enabled:@shell32.dll,-1

Rootkit Capabilities

This Virus does not have rootkit capabilities.

Information Theft

This Virus gathers the following data:

  • OS version
  • Volume information

Other Details

This Virus connects to the following website to send and receive information:

  • ant.{BLOCKED}z.pl
  • ilo.{BLOCKED}z.pl
  • {6 random characters based on system time}.com

It does the following:

  • It returns execution to the host file's original code after execution.
  • It infects the following API:
    • ntdll.ZwDeviceIoControlFile
    • ntdll.ZwCreateFile
    • ntdll.ZwOpenFile
    • ntdll.ZwCreateProcess
    • ntdll.ZwCreateProcessEx
    • ntdll.ZwCreateUserProcess
    • ntdll.ZwQueryInformationProcess

It prevents users from visiting antivirus-related websites that contain the following strings:

  • ahnlab
  • arcabit
  • avast
  • avg
  • avira
  • castlecops
  • centralcommand
  • clamav
  • comodo
  • computerassociates
  • cpsecure
  • defender
  • drweb
  • emsisoft
  • esafe
  • eset
  • etrust
  • ewido
  • f-prot
  • f-secure
  • fortinet
  • gdata
  • grisoft
  • hacksoft
  • hauri
  • ikarus
  • jotti
  • k7computing
  • kaspersky
  • malware
  • mcafee
  • microsoft
  • networkassociates
  • nod32
  • norman
  • norton
  • panda
  • pctools
  • prevx
  • quickheal
  • rising
  • rootkit
  • securecomputing
  • sophos
  • spamhaus
  • spyware
  • sunbelt
  • symantec
  • threatexpert
  • trendmicro
  • virus
  • wilderssecurity
  • windowsupdate

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

16.102.05

FIRST VSAPI PATTERN DATE:

14 Jul 2020

VSAPI OPR PATTERN File:

16.103.00

VSAPI OPR PATTERN Date:

15 Jul 2020

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

  • Troj.Win32.TRX.XXPE50FFF036

Step 2

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 3

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 4

Restart in Safe Mode

[ Learn More ]

Step 5

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\SYSTEM\ControlSet001\services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %System%\winlogon.exe = %System%\winlogon.exe:*:enabled:@shell32.dll,-1

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Virus.Win32.VIRUX.B. 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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