Win32/Bayrob [Threat Name] go to Threat

Win32/Bayrob.Y [Threat Variant Name]

Category trojan
Size 356352 B
Aliases Trojan.Bayrob.5 (Dr.Web)
Short description

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


When executed, the trojan copies itself in some of the the following locations:

  • %systemdrive%\­ksttegcuapdql\­rj%variable%xg5cqh.exe
  • %userprofile%\­ksttegcuapdql\­rj%variable%xg5cqh.exe
  • %temp%\­ksttegcuapdql\­rj%variable%xg5cqh.exe
  • %systemdrive%\­ksttegcuapdql\­vlnlprcsiz.exe
  • %userprofile%\­ksttegcuapdql\­vlnlprcsiz.exe
  • %temp%\­ksttegcuapdql\­vlnlprcsiz.exe
  • %systemdrive%\­ksttegcuapdql\­acvswvu.exe
  • %userprofile%\­ksttegcuapdql\­acvswvu.exe
  • %temp%\­ksttegcuapdql\­acvswvu.exe

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

The trojan registers itself as a system service using the following name:

  • Installer Connectivity Store Driver

The trojan may set the following Registry entries:

  • [HKEY_LOCAL_MACHINE\­Software\­Microsoft\­Windows\­CurrentVersion\­Run]
    • "DNS Discovery Service Store Device" = "%malwarefolder%\­vlnlprcsiz.exe"
  • [HKEY_CURRENT_USER\­Software\­Microsoft\­Windows\­CurrentVersion\­Run]
    • "DNS Discovery Service Store Device" = "%malwarefolder%\­vlnlprcsiz.exe"

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

Information stealing

The trojan collects the following information:

  • operating system version
  • computer name
  • computer IP address
  • information about the operating system and system settings
  • the path to specific folders
  • list of running services

The trojan can send the information to a remote machine.

The HTTP protocol is used.

Other information

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

The trojan generates various URL addresses. The HTTP protocol is used.

It can execute the following operations:

  • send gathered information
  • send the list of running processes to a remote computer
  • download files from a remote computer and/or the Internet
  • run executable files

The trojan displays a fake error message:

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