.. -*- coding: utf-8; -*-

=================================
 Computer viruses and rootckits.
=================================
.. contents::
   :local:

Online virus scaner.
====================

* http://virusscan.jotti.org/
* http://www.virustotal.com/
* http://virscan.org/

Rootkit checker.
================

For Debian::

  $ sudo apt-get install rkhunter chkrootkit

  $ sudo rkhunter -c
  ...

  $ sudo chkrootkit
  ...

..

* http://www.rootkit.nl/projects/rootkit_hunter.html

For Windows just use `Sysinternals suite
<https://technet.microsoft.com/ru-ru/sysinternals/>`_. There are two tools which
help a lot:

* ``procexp.exe`` to find which process lock file and path to executable images
  for removing unwanted software.
* ``autoruns.exe`` to find program and service registration.

Also you may use less powerful but built-in ``msconfig.exe`` to investigate
startup processes registration.

HijackThis.
-----------

Works nice on 32-bit Windows. But fail to properly handle paths on 64-bit.

Autoruns from sysinternals supresses HijackThis by quality and number of
detected places.

http://sourceforge.net/projects/hjt/
  Home page
https://en.wikipedia.org/wiki/HijackThis
  Wiki page.

GMER.
-----

List processes, services, autostarts, scans for rootkits or 3rd party file
registration.

Under Windows 10 x64 it cause reboot due to write to rean-only memory.

http://www.gmer.net/
  Home page.
https://en.wikipedia.org/wiki/GMER
  Wiki page.

Antivirus software.
===================

Debian.
-------

ClamAV - anti-virus utility for Unix::

  $ sudo apt-get install clamav

Windows.
--------

Free active antivirus:

* `Windows Defender
  <http://windows.microsoft.com/en-us/windows/using-defender>`_
* `Avast <http://www.avast.com/>`_ - free Antivirus is free only for personal
  and non-commercial use.

Free one time scan antivirus:

* `Dr.Web CureIt! <https://free.drweb.ru/cureit/>`_
* `Free Kaspersky security scan for your PC
  <http://www.kaspersky.com/free-virus-scan>`_
* `Kaspersky Virus Removal Tool <www.kaspersky.com/antivirus-removal-tool>`_
* `ESET SysInspector <http://www.eset.com/int/support/sysinspector/>`_.

Nod32 removal.
~~~~~~~~~~~~~~

Disable nod32 services by 'msconfig' utility.

Remove such keys from registry by 'regedit'::

  HKEY_LOCAL_MACHINE\SOFTWARE\ESET
  HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_NOD32DRV
  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\eamon  ==>
                ... easdrv easdrv EhttpSrv ekrn epfw Epfwndis epfwtdi