Win32/Remtasu [Threat Name] go to Threat

Win32/Remtasu.A [Threat Variant Name]

Category trojan
Size 61287 B
Detection created Apr 20, 2011
Signature database version 10181
Aliases Trojan-PSW.Win32.Agent.xny (Kaspersky)
  VirTool:Win32/Vbinder (Microsoft)
Short description

Win32/Remtasu.A is a trojan that steals sensitive information. The trojan is usually a part of other malware. The file is run-time compressed using UPX .

Installation

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

  • %system%\­InstallDir\­svchost.exe

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

  • [HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/Run]
  • "HKLM" = "%system%\­InstallDir\­svchost.exe"
  • [HKEY_CURRENT_USER/Software/Microsoft/Windows/CurrentVersion/Run]
    • "HKCU" = "%system%\­InstallDir\­svchost.exe"
  • [HKEY_LOCAL_MACHINE\­SOFTWARE\­Microsoft\­Active Setup\­Installed Components\­{0O25E04M-7B06-0HJ3-4JIE-F010140VRDC6}]
    • "StubPath" = "%system%\­InstallDir\­svchost.exe"

The following Registry entries are created:

  • [HKEY_CURRENT_USER\­Software\­XtremeRAT]
    • "Mutex" = "--((Mutex))--"
    • "ServerStarted" = "%variable%"
    • "ServerName" = "%system%\­InstallDir\­svchost.exe"
    • "InstalledServer" = "%system%\­InstallDir\­svchost.exe"

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


The trojan launches the following processes:

  • %defaultbrowser%
  • svchost.exe

The trojan creates and runs a new thread with its own code within these running processes.

Information stealing

Win32/Remtasu.A is a trojan that steals sensitive information.


It can execute the following operations:

  • steal information from the Windows clipboard
  • log keystrokes

The collected information is stored in the following file:

  • %appdata%\­--((Mutex))--.dat
Other information

The trojan contains an URL address.


It tries to download the other part of the infiltration from the address. The HTTP protocol is used.


The file is stored in the following location:

  • %appdata%\­--((Mutex))--.xtr

The file is executed as a thread in the folowing process:

  • %system%\­InstallDir\­svchost.exe

The trojan may create the following files:

  • %appdata%\­--((Mutex))--.cfg

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