Win32/Bandok [Threat Name] go to Threat

Win32/Bandok.AV [Threat Variant Name]

Category trojan
Size 98304 B
Aliases Backdoor.Win32.Bandok.av (Kaspersky)
  BackDoor-CSN.trojan (McAfee)
  Backdoor:Win32/Bandok (Microsoft)
  Backdoor.Trojan (Symantec)
Short description

The trojan serves as a backdoor. It can be controlled remotely. The trojan is usually a part of other malware.

Installation

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

  • %system%\­scvhost.exe

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

  • [HKEY_LOCAL_MACHINE\­Software\­Microsoft\­Windows\­CurrentVersion\­RunOnce]
    • "mssvc" = "%system%\­scvhost.exe"
  • [HKEY_CURRENT_USER\­Software\­Microsoft\­Windows\­CurrentVersion\­Run]
    • "mssvc" = "%system%\­scvhost.exe"
  • [HKEY_LOCAL_MACHINE\­SOFTWARE\­Microsoft\­Active Setup\­Installed Components\­{B6A807N6-42DF-4W02-93E5-B156B3FA8AL1}]
    • "StubPath" = "%system%\­scvhost.exe"

The trojan runs the default Internet browser.


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

  • explorer.exe
  • %defaultbrowser%

The trojan keeps various information in the following Registry keys:

  • [HKEY_CURRENT_USER\­Software\­Microsoft\­Windows\­CurrentVersion]
    • "fsettings"
    • "fstat"
    • "bnhide"
    • "ofk"
    • "eos"
  • [HKEY_CURRENT_USER\­Software\­Microsoft]
    • "remove"
Information stealing

The trojan collects the following information:

  • computer name
  • user name
  • environment variables
  • operating system version
  • memory status
  • current screen resolution
  • data from the clipboard

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

Other information

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


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


The trojan contains a list of (1) addresses. The TCP protocol is used.


It may perform the following actions:

  • download files from a remote computer and/or the Internet
  • run executable files
  • send gathered information
  • send files to a remote computer
  • terminate running processes
  • open a specific URL address
  • shut down/restart the computer
  • set up a proxy server
  • steal information from the Windows clipboard
  • delete files
  • send the list of disk devices and their type to a remote computer
  • send the list of running processes to a remote computer
  • delete Registry entries
  • create Registry entries
  • create folders
  • show/hide application windows
  • uninstall itself
  • log off the current user

The trojan may create the following files:

  • %windir%\­bmpl.dll
  • %windir%\­bupl.dll
  • %windir%\­bps1.exe
  • %windir%\­rar2.exe
  • %system%\­scvhost.exe
  • %windir%\­bnfa.exe
  • %windir%\­WinVNC.exe
  • %windir%\­VNCHooks.dll
  • %windir%\­xr4tdwa.exe
  • %windir%\­vdbn.exe
  • %windir%\­bhookpl.dll

The trojan may set the following Registry entries:

  • [HKEY_LOCAL_MACHINE\­SYSTEM\­ControlSet001\­Services\­SharedAccess\­Parameters\­FirewallPolicy\­StandardProfile\­GloballyOpenPorts\­List]
    • "%port1%:TCP" = "%port1%:TCP:*:Enabled:BND"
    • "%port2%:TCP" = "%ftpport%:TCP:*:Enabled:BNDFTP"
    • "%windir%\­WinVNC.exe" = "%windir\­WinVNC.exe%:*:Enabled:VNC BND"

The performed data entry creates an exception in the Windows Firewall program.


A string with variable content is used instead of %port1-2% .

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