F-Secure Virus Descriptions : Nightflyght

NAME:	Nightflyght
ALIAS:	VBS/Nightflyght.A@mm, VBS_Nflight.A, Bloodhound.VBS.Worm

Nightflyght is a polymorphic Visual Basic Script worm.

VARIANT: Nightflyght.A

Nightflyght.A worm spreads using Outlook and mIRC. The infected Outlook messages looks as follows:

	Subject: Hi :-)
	Body: <sctipt code>

The worm send itself as an embedded HTML, not as a separate attachment.

Nightflyght lower Internet Explorer security zones and WSH security settings:

	HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\
	HKCU\Software\Microsoft\Windows Script Host\Settings\TrustPolicy

The worm contains several payloads. If the day is 5th and any month, it removes the desktop:

	HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoDesktop

changes the registered owner to 'NightFlight':

	HKLM\Software\Microsoft\Windows\CurrentVersion\RegisteredOwner

and the registered organization to 'Carpe Noctem':

	HKLM\Software\Microsoft\Windows\CurrentVersion\RegisteredOrganization

The worm also changes the wallpaper to a random bit map file found on the infected system:

	HKCU\Control Panel\desktop\Wallpaper

Nightflight.A spreads via mIRC by modifying the Script.ini file. To do this it uses file warning.htm that it drops in Windows folder.

The worm affects Windows SE by executing Microsoft Agent and showing the following message:

	"The Nightflight is still out there!"

[Analysis: Katrin Tocheva, F-Secure; May 31, 2001]