F-Secure Virus Descriptions : NetSky.B
[Summary] | [Disinfection] | [Detailed Description] | [Detection]
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THIS VIRUS IS RANKED AS LEVEL 2 ALERT UNDER
F-SECURE RADAR.
Radar Alert LEVEL 2
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| NAME: | NetSky.B |
| ALIAS: | I-Worm.Moodown.B, W32/Netsky.B@mm, Moodown.B, Worm.Somefool |
Moodown.B (also known as NetSky.B) worm was found on 18th of
February 2004. It is a minor variant of NetSky.A worm that
appeared 2 days earlier. The worm spreads itself in e-mails
inside a ZIP archive or as an executable attachment. It also
copies itself to shared folders of all available drives. This
allows the worm to spread in P2P (peer-to-peer) and local
networks.
F-Secure provides the special disinfection utility to eliminate
NetSky.B worm infection. You can download this utility from our
ftp site:
ftp://ftp.europe.f-secure.com/anti-virus/tools/f-netsky.exe
ftp://ftp.europe.f-secure.com/anti-virus/tools/f-netsky.zip
Disinfection instructions can be found here:
ftp://ftp.europe.f-secure.com/anti-virus/tools/f-netsky.txt
System administrators who are using F-Secure Policy Manager, can
distribute the tool as a JAR package automatically to all
workstations.
System administrators can download the JAR version from:
http://www.europe.f-secure.com/tools/f-netsky.jar
ftp://ftp.europe.f-secure.com/anti-virus/tools/f-netsky.jar
Installation to system
When the worm's file is run, it first shows a fake error
messagebox:
Error
The file could not be opened!
Then the worm copies itself to Windows directory with
SERVICES.EXE name and creates a startup key for this file in
System Registry:
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"service" = "%windir%\services.exe -serv"
where %windir% represents Windows directory. At the same time the
worm also attempts to delete the following key values:
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"Taskmon"
"Explorer"
"system."
"KasperskyAv"
[HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"Taskmon"
"Explorer"
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices]
"system."
[HKCR\CLSID\{E6FB5E20-DE35-11CF-9C87-00AA005127ED}\InProcServer32]
After that the worm starts looking for e-mail addresses. It scans
files with the following extensions on all available drives
(c:-z:) except CD-ROM drives:
.msg
.oft
.sht
.dbx
.tbb
.adb
.doc
.wab
.asp
.uin
.rtf
.vbs
.html
.htm
.pl
.php
.txt
.eml
If the worm finds a folder with the 'sharing' or 'share' name, it
copies itself to that folder with the following names:
winxp_crack.exe
dolly_buster.jpg.pif
strippoker.exe
photoshop 9 crack.exe
matrix.scr
porno.scr
angels.pif
hardcore porn.jpg.exe
office_crack.exe
serial.txt.exe
cool screensaver.scr
eminem - lick my pussy.mp3.pif
nero.7.exe
virii.scr
e-book.archive.doc.exe
max payne 2.crack.exe
how to hack.doc.exe
programming basics.doc.exe
e.book.doc.exe
win longhorn.doc.exe
dictionary.doc.exe
rfc compilation.doc.exe
sex sex sex sex.doc.exe
doom2.doc.pif
Spreading in e-mails
When Internet connection is available, the worm starts to spread
itself. It creates ZIP archives with its file in Windows
directory. The names of these ZIP archives are the same as the
names of worm's files inside. The worm can use the following
names for its attachments:
document
msg
doc
talk
message
creditcard
details
attachment
me
stuff
posting
textfile
concert
information
note
bill
swimmingpool
product
topseller
ps
shower
aboutyou
nomoney
found
story
mails
website
friend
jokes
location
final
release
dinner
ranking
object
mail2
part2
disco
party
misc
The worm can use one or two extensions for its attachments. For
the first extension the worm uses the following:
.txt
.rtf
.doc
.htm
For the second extension the worm uses the following:
.exe
.scr
.com
.pif
The worm spreads itself in e-mails as a ZIP attachment or as an
attachment with one of the above shown names.
The subject of an infected e-mail can be one of the following:
hi
hello
read it immediately
something for you
warning
information
stolen
fake
unknown
The body text of an infected e-mail can be one of the following:
anything ok?
what does it mean?
ok
i'm waiting
read the details.
here is the document.
read it immediately!
my hero
here
is that true?
is that your name?
is that your account?
i wait for a reply!
is that from you?
you are a bad writer
I have your password!
something about you!
kill the writer of this document!
i hope it is not true!
your name is wrong
i found this document about you
yes, really?
that is bad
here it is
see you
greetings
stuff about you?
something is going wrong!
information about you
about me
from the chatter
here, the serials
here, the introduction
here, the cheats
that's funny
do you?
reply
take it easy
why?
thats wrong
misc
you earn money
you feel the same
you try to steal
you are bad
something is going wrong
something is fool
The worm's file is attached to the infected e-mail inside a ZIP
archive or as an normal binary file. 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.
Detection for Moodown.B worm is available in the following FSAV
updates:
[FSAV_Database_Version]
Version=2004-02-18_02
Technical Details:
Alexey Podrezov, February 18th, 2004;
Description Updated:
Alexey Podrezov, February 26th, 2004;
F-Secure Corporation
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