Win32/XHX [Threat Name] go to Threat

Win32/XHX.AA [Threat Variant Name]

Category trojan
Size 289761 B
Aliases Backdoor.Win32.XHX.174 (Kaspersky)
  BackDoor.Xhx.160 (Dr.Web)
  Backdoor:Win32/XHX.1_74 (Microsoft)
  W32/BackdoorX.HCC (F-Prot)
Short description

The trojan serves as a backdoor. It can be controlled remotely.


When executed the trojan copies itself in the following locations:

  • %windir%\­system32\­Internet.exe
  • %windir%\­system32\­uaiia.exe
  • %windir%\­Winhlp32.exe
  • %windir%\­Explore.exe
  • %windir%\­regedit.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]
    • "Internet.exe" = "Internet.exe"

The trojan may set the following Registry entries:

  • [HKEY_CLASSES_ROOT\­txtfile\­shell\­open\­command]
    • "(Default)" = "uaiia.exe %1"

The trojan modifies the following file:

  • %windir%\­win.ini

The trojan writes the following entries to the file:

  • [windows]
    • "Run" = "%windir%\­Explore.exe"

The trojan may create the text file:

  • %windir%\­system32\­ldyrh.ini
Information stealing

The following information is collected:

  • computer name
  • CPU information
  • list of running processes
  • display resolution
  • list of disk devices and their type
  • list of files/folders on a specific drive
  • screenshots
  • webcam video/voice

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 TCP, HTTP, FTP protocol is used in the communication.

It may perform the following actions:

  • execute shell commands
  • create files
  • delete files
  • copy files
  • create folders
  • delete folders
  • set file attributes
  • run executable files
  • terminate running processes
  • download files from a remote computer and/or the Internet
  • send files to a remote computer
  • set up a proxy server
  • manipulate application windows
  • open the CD/DVD drive
  • show toas message
  • shut down/restart the computer
  • update itself to a newer version
  • send gathered information

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