W32/Sality.n.dll

This page shows details and results of our analysis on the malware W32/Sality.n.dll

Overview

This is a virus detection. Viruses are programs that self-replicate recursively, meaning that infected systems spread the virus to other systems, which then propagate the virus further. While many viruses contain a destructive payload, it's quite common for viruses to do nothing more than spread from one system to another.


Minimum Engine

5600.1067

File Length

Description Added

2006-02-13

Description Modified

2008-05-15

Malware Proliferation

Characteristics

W32/Sality.n.dll is .dll file dropped by W32/Sality.n virus.

Upon being registered, it attempts to connect with the following servers:

  • www.rus0396kuku.com
  • www.invis1blearm333.com
  • etc

It also mails the W32/Sality.n virus to email addresses harvested from the victim machine, using its own SMTP engine to construct outgoing messages.

Symptoms

Unexpected network traffic to one or more of the domains mentioned above.

Method of Infection

W32/Sality.n searches local drives and network shares for Windows PE executable files to infect. It replaces the original entry point of the files it infects with its viral code and appends itself to the last section of the PE image.  The infected files grow by size by 20480 bytes.

Removal

All Users:

Please use the following instructions for all supported versions of Windows to remove threats and other potential risks:

1.Disable System Restore .

2.Update to current engine and DAT files for detection and removal.

3.Run a complete system scan.

Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).

1. Please go to the Microsoft Recovery Console and restore a clean MBR.

On windows XP:

Insert the Windows XP CD into the CD-ROM drive and restart the computer.
When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
Select the Windows installation that is compromised and provide the administrator password
Issue 'fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.


On Windows Vista and 7:

Insert the Windows CD into the CD-ROM drive and restart the computer.
Click on "Repair Your Computer"
When the System Recovery Options dialog comes up, choose the Command Prompt.
Issue 'bootrec /fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.

Variants