F-Secure Virus Descriptions : NetSky.O
[Summary] | [Disinfection] | [Detailed Description] | [Detection]
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The Netsky.O variant was discovered on March 16th 2004.
The O variant follows the footsteps of the earlier ones. This variant
uses four different fake antivirus scanner messages mentioning four
different major antivirus companies including F-Secure.
F-Secure provides the special disinfection utility to eliminate
Netsky.O worm infection. You can download this utility from our
ftp site:
ftp://ftp.f-secure.com/anti-virus/tools/f-netsky.exe
ftp://ftp.f-secure.com/anti-virus/tools/f-netsky.zip
Disinfection instructions can be found here:
ftp://ftp.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
System Infection
Upon execution the worm copies itself to the Windows System Directory
with the filename 'AVBgle.exe' which is added to the registry as
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] =
"MsInfo" = "%SysDir%\AVBgle.exe"
The worm removes several registry values that belong to other worms.
Email Propagation
When collecting addresses NetSky.O recursively searches through all hard
drives and checks the content of files with the following extensions:
.pl
.htm
.html
.eml
.txt
.php
.asp
.wab
.doc
.vbs
.rtf
.uin
.shtm
.cgi
.dhtm
.adb
.tbb
.dbx
.sht
.oft
.msg
.jsp
.wsh
.xml
Emails composed from different components randomly chosen from predefined
sets.
Possible subjects:
Re: Mail Authentification
Re: Delivery Protection
Re: Secure delivery
Re: Protected Mail Delivery
Re: Protected Mail System
Re: Protected Mail Request
Re: Secure SMTP Message
Re: Extended Mail System
Re: Error
Re: Message Error
Re: Administration
Re: Test
Re: Thank you for delivery
Re: Failure
Re: Bad Request
Re: Delivery Server
Re: Mail Server
Re: SMTP Server
Re: Notify
Re: Status
Re: Extended Mail
Re: Encrypted Mail
Email bodies are chosen from:
You have received an extended message. Please read the instructions.
New message is available.
Now a new message is available.
You got a new message.
SMTP: Please confirm the attached message.
Bad Gateway: The message has been attached.
Protected message is available.
Waiting for authentification.
Protected message is attached.
Please authenticate the secure message.
Follow the instructions to read the message.
Please read the attachment to get the message.
Encrypted message is available.
Delivered message is attached.
Forwarded message is available.
Secure Mail System Beta Test.
Protected Mail System Test.
Your requested mail has been attached.
For further details see the attachment.
For more details see the attachment.
First part of the secure mail is available.
Waiting for a Response. Please read the attachment.
Partial message is available.
ESMTP [Secure Mail System #334]: Secure message is attached.
Please confirm my request.
Attachment names can be one of
message.pif
msg.pif
details.pif
data.pif
document.pif
readme.pif
All messages end with a fake antivirus scanner message chosen
from four different variants:
+++ Attachment: No Virus found
+++ Panda AntiVirus - You are protected
+++ www.pandasoftware.com
+++ Attachment: No Virus found
+++ F-Secure AntiVirus - You are protected
+++ www.f-secure.com
+++ Attachment: No Virus found
+++ Norman AntiVirus - You are protected
+++ www.norman.com
+++ Attachment: No Virus found
+++ Norton AntiVirus - You are protected
+++ www.symantec.de
Detection for this malware was published on March 17th, 2004
in the following F-Secure Anti-Virus updates:
[FSAV_Database_Version]
Version=2004-03-17_01
Technical Details:
Gergely Erdelyi, March 17th, 2004;
Description Updated:
Alexey Podrezov, March 18th, 2004;
F-Secure Corporation
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