McAfee > Theat Center > Virus Detail Page

Overview

This detection is for a worm that attempts to copy itself to the root of any accessible disk volumes. Additionally it attempts to place an Autorun.inf file on the root of the volume so that it is executed the next time the volume is mounted.

The worm drops a DLL file that is injected into EXPLORER.EXE see the associated VIL at:

http://vil.nai.com/vil/content/v_144323.htm

Characteristics

This detection is for a worm.
It attempts to spread to removable drives by creating an autorun.inf file, which will run the worm automatically, if a systems which use the removable drive are set to Autorun.

• This worm adds the following files and registry entries to load itself on startup.

Files:
c:\WINDOWS\system32\amvo.exe
c:\WINDOWS\system32\amvo0.dll

Registry:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
amva = C:\WINDOWS\System32\amvo.exe

• This worm changes the following registry values in attempt to change the windows explorer view settings

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
Hidden = 2

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
ShowSuperHidden = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL
CheckedValue = 0

• This worm also attempts to create an autorun.inf file on the root any accessible disk volumes.

[Drive]:\autorun.inf

• The autorun.inf will reference one of the following files that will also be written to the root of the volume.

(Additional filenames may be found in other variants of this worm)
[Drive]:\xn1i9x.com
[Drive]:\2ifetri.cmd
[Drive]:\x.com
[Drive]:\3wcxx91.cmd
[Drive]:\awda2.exe

Symptoms

Existence of mentioned files and registry keys.

Method of Infection

This worm may be spread by its intented method of infected removable drives.

Alternatively this may be installed by visiting a malicious web page (either by clicking on a link, or by the website hosting a scripted exploit which installs the worm onto the user's system with no user interaction.

Removal

All Users:
Use current engine and DAT files for detection and removal.

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).

Additional Windows ME/XP removal considerations

Variants

Variants

N/A

All Information

Overview -

This detection is for a worm that attempts to copy itself to the root of any accessible disk volumes. Additionally it attempts to place an Autorun.inf file on the root of the volume so that it is executed the next time the volume is mounted.

The worm drops a DLL file that is injected into EXPLORER.EXE see the associated VIL at:

http://vil.nai.com/vil/content/v_144323.htm

Characteristics

Characteristics -

This detection is for a worm.
It attempts to spread to removable drives by creating an autorun.inf file, which will run the worm automatically, if a systems which use the removable drive are set to Autorun.

• This worm adds the following files and registry entries to load itself on startup.

Files:
c:\WINDOWS\system32\amvo.exe
c:\WINDOWS\system32\amvo0.dll

Registry:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
amva = C:\WINDOWS\System32\amvo.exe

• This worm changes the following registry values in attempt to change the windows explorer view settings

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
Hidden = 2

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
ShowSuperHidden = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL
CheckedValue = 0

• This worm also attempts to create an autorun.inf file on the root any accessible disk volumes.

[Drive]:\autorun.inf

• The autorun.inf will reference one of the following files that will also be written to the root of the volume.

(Additional filenames may be found in other variants of this worm)
[Drive]:\xn1i9x.com
[Drive]:\2ifetri.cmd
[Drive]:\x.com
[Drive]:\3wcxx91.cmd
[Drive]:\awda2.exe

Symptoms

Symptoms -

Existence of mentioned files and registry keys.

Method of Infection

Method of Infection -

This worm may be spread by its intented method of infected removable drives.

Alternatively this may be installed by visiting a malicious web page (either by clicking on a link, or by the website hosting a scripted exploit which installs the worm onto the user's system with no user interaction.

Removal -

Removal -

All Users:
Use current engine and DAT files for detection and removal.

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).

Additional Windows ME/XP removal considerations

Variants

Variants -

N/A