Win32/HoudRat [Threat Name] go to Threat

Win32/HoudRat.A [Threat Variant Name]

Category trojan,worm
Size 3617960 B
Detection created Jul 20, 2016
Detection database version 13834
Aliases Worm.Win32.AutoIt.aku (Kaspersky)
  Worm:Win32/Usbitna.A (Microsoft)
  W32/Autorun.worm.ga.virus (McAfee)
Short description

The worm serves as a backdoor. It can be controlled remotely. It is written in AutoIt .

Installation

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

  • C:\­AntiShortCut\­AntiUsbShortCut.zip

The worm creates the following files:

  • C:\­AntiShortCut\­AntiUsb.exe
  • C:\­AntiShortCut\­BrowsingHistoryView.exe (336480 B, Win32/BrowsingHistoryView.A)
  • C:\­AntiShortCut\­BrowsingHistoryView.cfg (596 B)

The worm creates copies of the following files (source, destination):

  • %currentfolder%\­*.*, C:\­AntiShortCut\­*.*

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

  • [HKEY_CURRENT_USER\­Software\­Microsoft\­Windows\­CurrentVersion\­Run]
    • "AntiShortCutUpdate" = "C:\­AntiShortCut\­AntiUsb.exe C:\­AntiShortCut\­AntiUsbShortCut.zip"
  • [HKEY_CURRENT_USER\­Software\­Microsoft\­Windows\­CurrentVersion\­Run]
    • "AntiUsbShortCut" = "cmd.exe /c start C:\­AntiShortCut\­AntiUsb.exe C:\­AntiShortCut\­AntiUsbShortCut.zip & exit"
  • [HKEY_LOCAL_MACHINE\­Software\­Microsoft\­Windows\­CurrentVersion\­Run]
    • "AntiShortCutUpdate" = "C:\­AntiShortCut\­AntiUsb.exe C:\­AntiShortCut\­AntiUsbShortCut.zip"
  • [HKEY_LOCAL_MACHINE\­Software\­Microsoft\­Windows\­CurrentVersion\­Run]
    • "AntiUsbShortCut" = "cmd.exe /c start C:\­AntiShortCut\­AntiUsb.exe C:\­AntiShortCut\­AntiUsbShortCut.zip & exit"

The worm creates the following files:

  • %commonstartup%\­AntiWormUpdate.lnk
  • %commonstartup%\­AntiUsbWormUpdate.lnk

These are shortcuts to files of the worm .


This causes the worm to be executed on every system start.


The following Registry entry is set:

  • [HKEY_CURRENT_USER\­Software\­Microsoft\­Windows\­CurrentVersion\­Explorer\­Advanced]
    • "ShowSuperHidden" = 0

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


The worm quits immediately if it detects a running process containing one of the following strings in its name:

  • avguard.exe
  • avp.exe
  • BehaviorDumper.exe
  • FakeHTTPServer.exe
  • FakeServer.exe
  • FortiTracer.exe
  • fsbwsys.exe
  • guninraik.exe
  • kavmm.exe
  • kavsvc.exe
  • nod32kui.exe
  • procmon.exe
  • procmon.exe
  • SbieSvc.exe
  • tcpview.exe
  • VBoxService.exe
  • VBoxTray.exe
  • vmacthlp.exe
  • vmtoolsd.exe
  • VMwareService.exe
  • VMwareUser.exe
  • VMwareUser.exe
  • zonealarm.exe

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

  • C:\­CWSandbox\­
  • C:\­python26\­
  • C:\­cuckoo\­

The worm quits immediately if it detects a running process containing one of the following strings in its path:

  • C:\­virus\­
  • artifact
  • sample
Spreading

Win32/HoudRat.A is a worm that spreads via removable media.


The worm copies itself to the following locations:

  • %drive%\­AntiUsbShortCut\­AntiUsbShortCut.zip

The following file is created in the same folders:

  • AntiUsb.exe

The worm creates the following files:

  • %drive%\­My Pictures.lnk
  • %drive%\­My Videos.lnk
  • %drive%\­My Downloads.lnk

These are shortcuts to files of the worm .


The worm searches for files and folders in the root folders of removable drives.


When the worm finds a file matching the search criteria, it creates a new file.


The file is a shortcut to a malicious file.


The name of the file may be based on the name of an existing file or folder.

Information stealing

The worm collects the following information:

  • web browser history
  • user name
  • computer name
  • operating system version
  • installed antivirus software

The worm is able to log keystrokes.


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

Other information

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


The worm contains a list of (6) URLs. The worm generates various URL addresses.


The HTTP, TCP protocol is used in the communication.


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
  • execute shell commands
  • capture screenshots
  • send the list of disk devices and their type to a remote computer
  • send the list of files on a specific drive to a remote computer
  • send the list of running processes to a remote computer
  • send requested files
  • terminate running processes
  • shut down/restart the computer
  • visit a specific website
  • display a dialog window
  • stop itself for a certain time period

The worm may display the following message:

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