NetSky.E (also known as Moodown.E) worm was found on 1st of March 2004 just a few hours after NetSky.D variant. The .E variant is very close to .C variant of the worm. NetSky.E spreads itself in emails inside a ZIP archive or as an executable attachment.
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Descriptions of previous NetSky variants can be found here:
The differences between NetSky.E variant and the .C variant of the worm are as follows:
.txt .rtf .doc .htm .jpg .gif
.exe .scr .com .pif .bat .cmd
icrosoft antivi ymantec spam avp f-secur itdefender orman cafee aspersky f-pro orton fbi abuse messagelabs skynet
Delivery Failed Status report question trust me hey Re: excuse me read it immediatelly hi Re: does it? Yep important hello dear Re: unknown fake? warning moin what's up? info Re: information Here is it stolen private? good morning illegal... error take it re: Re: Re: Re: Re: you? something for you exception Re: hey excuse me Re: hi Re: does it? Re: important Re: hello believe me Question denied! notification Re: [5664ddff?$??Â§2] lol last chance! I'm back! its me notice! oh Announcement Re: Thank you Re: Details Thank you Details Re: Approved Approved hi, it's me Thank You very very much You use illegal... Your IP was logged Love is Re: [censored] registered? Your request was registered read now! Attention Schedule You have 1 day left Re: information automatic notification Expired account automatic responder Read this message please read please reply Registration confirm Confirmation Confirmation Required Returned Mail
The .E worm variant just like the .C variant spreads itself in emails as a ZIP attachment or as an executable attachment with one of the hardcoded names and single or double extension. A recipient has to unpack the worm's attachment from a ZIP archive and to run it or to run an executable attachment to get infected.
Like the .C variant, NetSky.E worm variant installs itself as WINLOGON.EXE file to Windows folder and creates a startup key for this file in the Registry:
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] "ICQ Net" = "%windir%\winlogon.exe -stealth"
where %windir% represents Windows directory.
For more details, please see the description of NetSky.C worm variant.