このワームは様々な形式で圧縮されており、UPXユーティリティで圧縮されていた場合、そのサイズは 24,064バイトです。

電子メールを使って拡散するとき、このワームは、メールの題名に次の文字列のいずれかを使用します。メールの題名が無い場合（空白）もあります。

believe me
dear
Delivery Failed
denied!
error
exception
excuse me
fake?
good morning
hello
Here is it
hey
hi
illegal...
I'm back!
important
info
its me
last chance!
lol
moin
notice!
notification
oh
private?
question
Question
re:
Re: <5664ddff?$??2>
Re: does it?
Re: does it?
Re: excuse me
Re: hello
Re: hey
Re: hi
Re: important
Re: information
Re: Re: Re: Re:
Re: unknown
read it immediatelly
report
something for you
Status
stolen
take it
trust me
warning
what's up?
Yep
you?

メールの本文には、次の文字列のいずれかが含まれています。 メールの本文が無い場合（空白）もあります。

*lol*
;-)
[...]
[?}
[[[Failure]]]
[09580985869gj]
[Antispam complete]
[Attached Msg]
[Attachment from Poland]
[Attachment Signature 34933920]
[Automailer]
[bad gateway]
[Click the attachment to decrypt]
[Deliver Error]
[Failed message available]
[Mail failed]
[Message Error]
[null]
[scanned by norton antivirus]
[Server Error]
[Transfer complete]
[Warning from the Government]
a crazy doc about you
abuse?
account?
already?
another pic, have fun! ... :-]
Antispam is turned off. See file!
are you a photographer?
are you a teacherin the picture?
are you cranky?
are you the naked one?
are you the naked person!
are you the one?
attachi#
Authentification required. Read the att...
be mad?
best?
bob the builder
child or adult?
child porn?
classroom test of you?
copyright?
correct it!
did you ask me for that?
did you know from this document?
did you know that?
did you see her already?
did you sent it to me?
do not give up!
do not open the attachment!
do not show this anyone!
do not use my document!
do not use this creditcard!
do not visit the pages on the list I se...
do you have an orgasm in the picture?
do you have sex in the picture?
do you have the bug also?
do you have?
do you know the thief?
do you know this????
do you think so?
doc about me?
doc?
docs?
does it belong to you?
does it belong to you?
does it match?
does it matter?
drugs? ...
excellent!
explain!
fast food...
feel free to use it.
File is bad.
File is damaged.
File is self-decryting.
forgotten?
from the chatter (my photo!)
from your lover ;-)
gonna?
good work!
great job!
great xxx!
great!
greetings
help attached
her.
here is it.
here is my advice.
here is my photo!
here is the $%%454$
here is the [censored]
here is the document.
here is the next one!
here is yours!
here, the cheats
here, the introduction
here, the serials
how?
i am desperate
i am speachless about your document!
I don't know your document!
i don't think so.
i don't want your xxx pics!
i found that about you!
i found this document about you.
i have received this.
I have your password!
i hope thats not true!
i know your document!
i like your doc!
i lost that
i need you!
i saw you last week!
I 've found your bill!
I wait for an answer!
i wait for your comment about it.
i want more...
illegal st. of you?
important?
in your mind?
incest?
information about you?
Instant patches.
instruct me about this!
is that criminal?
is that possible?
is that the reality?
is that true?
is that your account?
is that your account?
is that your attachment?
is that your beast?
is that your car?
is that your car?
is that your cd?
is that your creditcard?
is that your domain?
is that your family?
is that your finger?
is that your message?
is that your name?
is that your photo?
is that your porn pic?
is that your privacy?
is that your slip?
is that your TAN?
is that your website?
is that your wife?
is that your work?
is that yours?
is the pic a fake?
is this information about you?
it's a secret!
its private from me
it's so similar as yours!
i've found it about you
kill him on the picture!
kill the writer of this document!
let it!
lets talk about it!
Login required! Read the attachment!
love letter?
man or women?
meaning of that?
message?
Microsoft
misc. and so on. see you!
modifications?
money?
msg
my advice....
never!
new patch is available!
ok...
old photos about you?
only encrypted!
pages?
personal message!
picture?
poor quality!
possible?
pretty pic about you?
pwd?
read it immediately!
read the details.
really?
reply
schoolfriend?
see this!
see your name!
solve the problem!
something about you!
something is going ...
something is going wrong!
something is not ok
stuff about you?
such as yours?
take it easy!
tell me more about your document!
test it
that is interesting...
that's a funny text.
that's not the truth?
thats wrong!
the information is wrong!
the truth?
this file is bad!
this is an attachment message!
this is nothing for kids!
time to fear?
Transaction failed. Show the doc!
trial?
try this patch!
what do you think about it?
what means that?
what still?
what?
who?
why should I?
why?
wrong calculation! (see the attachment!...
xxx ?
xxx about you?
xxx service
yes.
you are a bad writer
you are bad
You are infected. Read the details!
you are naked in this document!
you are sexy in this doc!
you cannot hide yourself! (see photo)
you earn money, see the attachment!
you feel the same.
you have a sexy body in the pic!
you have done a mistake in the document...
you have tried to steal!
you look like an ape!
you look like an rat?
you won the rk!
your account is expired!
your are naked?
your attachment? verify it.
Your bill.
your body?
your design is not good!
your document is not good
your document is silly!
your eyes?
your face?
your hero in the picture?
your icq number?
your job? (I found that!)
your lie is going around the world!
your name is wrong!
your personal record?
your photo is poor
Your provider will be disabled!
your TAN number?
yours?

添付ファイル名は次のいずれかです。

454543403
aboutyou
associal
attach2
attachment
auction
bill
birth
card
class_photos
concert
creditcard
death
description
details
dinner
disco
doc
doc_ang
document
final
found
freaky
friend
id
image
important
incest
information
injection
intimate stuff
jokes
letter
location
mail2
mails
masturbation
material
me
message
misc
moonlight
more
msg
msg2
music
myaunt
mydate
naked1
naked2
news
nomoney
note
nothing
number_phone
object
old_photos
part2
party
paypal
pic
portmoney
poster
posting
privacy
product
ps
ranking
regards
regid
release
response
schock
secrets
sexual
sexy
shower
story
stuff
swimmingpool
talk
tear
textfile
topseller
transfer
trash
undefinied
unfolds
update
violence
visa
warez
webcam
website
wife
word_doc
worker
your_stuff
yours

添付ファイルの拡張子は、以下のいずれかになります。

.com
.doc
.doc.com
.doc.exe
.doc.pif
.doc.scr
.exe
.htm
.htm.com
.htm.exe
.htm.pif
.htm.scr
.pif
.rtf
.rtf.com
.rtf.exe
.rtf.pif
.rtf.scr
.scr
.txt
.txt.com
.txt.exe
.txt.pif
.txt.scr
.zip

このワームが実行されると、このワームは、Windowsフォルダ（例えば、"c:\windows"）
またはWindowsシステムフォルダに winlogon.exe を作成します。

このワームは、次のレジストリキーを追加します。

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
"ICQNet" = "c:\windows\winlogon.exe -stealth"

このワームは、CD-ROMを除くすべてのローカルディスクドライブから、"SHAR"という名前をもつディレクトリを検索して、それらの名前をもつディレクトリを発見したら、そのディレクトリに自分自身のコピーを次のファイル名でコピーします。

1000 Sex and more.rtf.exe
3D Studio Max 3dsmax.exe
ACDSee 9.exe
Adobe Photoshop 9 full.exe
Adobe Premiere 9.exe
Ahead Nero 7.exe
Best Matrix Screensaver.scr
Clone DVD 5.exe
Cracks & Warez Archive.exe
Dark Angels.pif
Dictionary English - France.doc.exe
DivX 7.0 final.exe
Doom 3 Beta.exe
E-Book Archive.rtf.exe
Full album.mp3.pif
Gimp 1.5 Full with Key.exe
How to hack.doc.exe
IE58.1 full setup.exe
Keygen 4 all appz.exe
Learn Programming.doc.exe
Lightwave SE Update.exe
Magix Video Deluxe 4.exe
Microsoft Office 2003 Crack.exe
Microsoft WinXP Crack.exe
MS Service Pack 5.exe
Norton Antivirus 2004.exe
Opera.exe
Partitionsmagic 9.0.exe
Porno Screensaver.scr
RFC Basics Full Edition.doc.exe
Screensaver.scr
Serials.txt.exe
Smashing the stack.rtf.exe
Star Office 8.exe
Teen Porn 16.jpg.pif
The Sims 3 crack.exe
Ulead Keygen.exe
Virii Sourcecode.scr
Visual Studio Net Crack.exe
Win Longhorn Beta.exe
WinAmp 12 full.exe
Windows Sourcecode.doc.exe
WinXP eBook.doc.exe
XXX hardcore pic.jpg.exe

また、このワームは、Mydoom.A および Mydoom.B に関連する以下のレジストリキーを削除することを試みます。

HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\au.exe
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\d3dupdate.exe
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Explorer
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\KasperskyAv
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OLE
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Taskmon
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows Services Host
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\DELETE ME
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Explorer
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\KasperskyAv
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\msgsvr32
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Sentry
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\service
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\system.
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Taskmon
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows Services Host
HKCR\CLSID\{E6FB5E20-DE35-11CF-9C87-00AA005127ED}\InProcServer32
HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\PINF
HKLM\System\CurrentControlSet\Services\WksPatch

このワームは、感染を広げるために、感染したコンピュータ上の次の拡張子をもつファイルからメールアドレスを取得します。

.adb
.asp
.dbx
.doc
.eml
.htm
.html
.msg
.oft
.php
.pl
.rtf
.sht
.tbb
.txt
.uin
.vbs
.wab

ただし、メールアドレスに次の文字列が含まれる場合は、このワームは自分自身を送信しません。

abuse
antivi
aspersky
avp
cafee
fbi
f-pro
f-secur
icrosoft
itdefender
orman
orton
spam
ymantec

Win32/NetSky.C は、NOD32アンチウイルスの拡張ヒューリスティック機能によって検出されるワームの一つです。これは、すべてのNOD32ユーザーがこのワームが発生した時点からすでに保護されていることを意味します。

NOD32アンチウイルスは、ウイルス定義ファイルのバージョン1.632にて対応しています。