Win32/Straftoz [Threat Name] go to Threat

Win32/Straftoz.A [Threat Variant Name]

Category trojan
Size 376832 B
Detection created Aug 22, 2014
Detection database version 10297
Aliases Trojan-Dropper.Win32.Injector.klpg (Kaspersky)
  TR/Dropper.VB.17632 (Avira)
  Variant.Zusy.103852 (BitDefender)
Short description

Win32/Straftoz.A is a trojan which tries to download other malware from the Internet.


When executed, the trojan copies itself into the following location:

  • %appdata%\­%existingfoldername%\­%prefix%%existingfoldernamewithoutspaces%.exe

The %prefix% is one of the following strings:

  • agent
  • ctrl
  • inst
  • install
  • mgr
  • setup
  • start
  • stp
  • sync
  • tray
  • upd
  • update
  • use
  • win
  • xpers

In order to be executed on every system start, the trojan sets the following Registry entry:

  • [HKEY_CURRENT_USER\­Software\­Microsoft\­Windows\­CurrentVersion\­Run]
    • "%prefix%%existingfoldernamewithoutspaces%" = "%appdata%\­%existingfoldername%\­%prefix%%existingfoldernamewithoutspaces%.exe"

The trojan creates and runs a new thread with its own program code within the following processes:

  • explorer.exe

The trojan terminates its execution if it detects that it's running in a specific virtual environment.

The trojan quits immediately if any of the following folders/files is detected:

  • C:\­popupkiller.exe
  • C:\­TOOLS\­execute.exe

The trojan quits immediately if any of the following applications is detected:

  • Deep Freeze
  • Sandboxie
  • Wine
Information stealing

The trojan collects the following information:

  • operating system version
  • malware version
  • language settings
  • computer name

The trojan attempts to send gathered information to a remote machine.

Other information

The trojan acquires data and commands from a remote computer or the Internet.

The trojan contains a URL address. The HTTP protocol is used.

It can execute the following operations:

  • download files from a remote computer and/or the Internet
  • run executable files
  • update itself to a newer version
  • uninstall itself

The trojan keeps various information in the following Registry key:

  • [HKEY_CURRENT_USER\­Software\­Microsoft\­{%variable1%}\­{%variable2%}]

A string with variable content is used instead of %variable1-2% .

The trojan contains both 32-bit and 64-bit program components.

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