Trojan-Downloader:W32/VB.AXS

Classification

Category :

Malware

Type :

Trojan-Downloader

Aliases :

Trojan-Downloader:W32/VB.AXS, Trojan-Downloader:W32/VB.AXS

Summary

This is a Visual Basic trojan-downloader that downloads and executes a Renos variant.

Renos shows fake security warnings that can be quite annoying.

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

This is a Visual Basic trojan-downloader that downloads and executes a Renos variant, software that shows fake security warnings that can be quite annoying. The aim of this software is to trick the computer user into downloading third-party "cleaning utilities", usually anti-spyware scanners or Rogue antispyware. Once executed, it downloads and creates these files:

  • %windir%\system32\msorcl32.exe
  • %windir%\system32\wmvds32.dll

Detected as Trojan-Downloader.Win32.VB.asx, wmvds32.dll is loaded in other processes and this ensures that an updated copy of Renos, msorcl32.exe, detected as Hoax.Win32.Renos.fn, is downloaded to the infected machine.