Trojan:W32/VB.BKX

Classification

Category :

Malware

Type :

Trojan

Aliases :

Trojan.Win32.VB.bkx

Summary

Trojans are malicious programs that pretend be to benign. Trojans do not replicate themselves.

Removal

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note: You need administrative rights to change the settings.

Technical Details

The malware's hosts file contains banking related search strings targeting a bank in the .mx Top Level Domain (TLD).

File System Changes

Creates these files:

  • %temp%\win32.exe
  • %windir%\system32\drivers\etc\hosts

Removes these files:

  • %cwd%\sample.exe
  • %windir%\system32\drivers\etc\hosts

Process Changes

Creates these processes:

  • %programfiles%\Internet Explorer\IEXPLORE.EXE

Uses these temporary processes:

  • %localsettings\Temp\win32.exe

Creates these mutexes:

  • IEXPLORE.EXE: _SHuassist.mtx
  • IEXPLORE.EXE: CritOpMutex

Network Connections

Attempts to download files from:

  • https://bux.to/[REMOVED].php

Registry Modifications

Sets these values:

  • HKCU\Software\Microsoft\Internet Explorer\Main FullScreen = no
  • HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\\\UserAssist\{5E6AB780-7743-11CF-A12B-00AA004AE837}\Count HRZR_PGYFRFFVBA = \x94\x3F\x43\x0E\x28\x00\x00\x00