Nightflyght is a polymorphic Visual Basic Script worm.
Disinfection & Removal
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:
changes the registered owner to 'NightFlight':
and the registered organization to 'Carpe Noctem':
The worm also changes the wallpaper to a random bit map file found on the infected system:
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!"
Technical Details: Katrin Tocheva, F-Secure; May 31, 2001