Win32/Tuwuky [Threat Name] go to Threat

Win32/Tuwuky.A [Threat Variant Name]

Category worm
Size 141824 B
Detection created Jun 01, 2011
Detection database version 10205
Aliases VirTool:Win32/Injector.BZ (Microsoft)
  Win32:Zbot-NDX (Avast)
Short description

Win32/Tuwuky.A is a worm that spreads via IM and social networks.

Installation

When executed the worm copies itself in the following locations:

  • %localappdata%\­%variable%.exe
  • %startup%\­%variable%.exe

In order to be executed on every system start, the worm sets the following Registry entries:

  • [HKEY_LOCAL_MACHINE\­Software\­Microsoft\­Windows\­CurrentVersion\­Run]
    • "%variable%" = "%localappdata%\­%variable%.exe"
  • [HKEY_CURRENT_USER\­Software\­Microsoft\­Windows\­CurrentVersion\­Run]
    • "%variable%" = "%localappdata%\­%variable%.exe"

A string with variable content is used instead of %variable% .

Information stealing

The worm collects the following information:

  • operating system version
  • computer name
  • network parameters
  • installed software

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

Spreading

Win32/Tuwuky.A is a worm that spreads via IM and social networks.


The worm sends links to Facebook, MSN users.

Other information

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


The worm contains a list of addresses. The IRC protocol is used in the communication.


It may perform the following actions:

  • download files from a remote computer and/or the Internet
  • run executable files
  • update itself to a newer version
  • uninstall itself
  • spread via IM networks
  • change the home page of web browser

The worm may create the following files:

  • %temp%\­rmme%variable%.bat
  • %temp%\­eraseme_%variable%.exe
  • %temp%\­ageofempires_%variable%.exe

The worm may set the following Registry entries:

  • [HKEY_CURRENT_USER\­Software\­twk70]
    • "n" = 1
  • [HKEY_CURRENT_USER\­Software\­Microsoft\­Internet Explorer\­Main]
    • "Start Page" = "%variable%"

A string with variable content is used instead of %variable% .


The worm executes the following command:

  • netsh firewall add allowedprogram 1.exe 1 ENABLE

The performed command creates an exception in the Windows Firewall.

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