W32/Sality.m.dll

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

4688 (2006-02-02)

Updated DAT

4831 (2006-08-17)

Minimum Engine

5400.1158

File Length

Description Added

2006-02-02

Description Modified

2006-02-09

Malware Proliferation

Characteristics

This detection is for a Win32 parasitic virus variant that infects Windows portable executable (PE) files.

This is the DLL component of W32/Sality.m which is injected into the memory space of running processes. More details of this virus variant are available at http://vil.nai.com/vil/content/v_138354.htm .

Symptoms

Presence of the following file detected as W32/Sality.m.dll:

  •  %Windir%\System32\olemdb32.dll

Method of Infection

This is a parasitic virus that searches and infects Windows Portable Executable (PE) files that typically has the .EXE file extension.

It replaces the original code at the entry point with viral code and stores an encrypted copy of the original code in the appended space of the file. Due to a bug in the virus, it may cause certain PE files to be corrupted.

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