Worm/NetSky.Q - Worm

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Summary

Full description

Statistics

Virus:	Worm/Netsky.Q
Date discovered:	29/03/2004
Type:	Worm
In the wild:	No
Reported Infections:	Low
Distribution Potential:	Medium
Damage Potential:	Low
Static file:	Yes
File size:	28.008 Bytes
MD5 checksum:	04871d17dbbd1911afc76aad6d9dbd20
VDF version:	6.24.0.75

General Method of propagation:
   • Email

Aliases:
   • Symantec: W32.Netsky.Q@mm
   • Mcafee: W32/Netsky.q@MM
   • Kaspersky: Email-Worm.Win32.NetSky.r
   • TrendMicro: WORM_NETSKY.Q
   • Grisoft: I-Worm/Netsky.R
   • VirusBuster: I-Worm.Netsky.R
   • Bitdefender: Win32.NetSky.Q@mm

Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003

Side effects:
   • Drops a malicious file
   • Uses its own Email engine
   • Registry modification
   • Makes use of software vulnerability

Right after execution it runs a windows application which will display the following window:

Files It copies itself to the following location:
   • %WINDIR%\sysmonxp.exe

It copies itself within an archive to the following location:
   • %WINDIR%\zippedbase64.tmp

The following files are created:

– MIME encoded copies of itself:
   • %WINDIR%\base64.tmp
   • %WINDIR%\zipo0.txt
   • %WINDIR%\zipo1.txt
   • %WINDIR%\zipo2.txt
   • %WINDIR%\zipo3.txt

– %WINDIR%\firewalllogger.txt Further investigation pointed out that this file is malware, too. Detected as: Worm/NetSky.Q.Drp

Registry The following registry key is added in order to run the process after reboot:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "SysMonXP"="%WINDIR%\SysMonXP.exe"

The following registry keys including all values and subkeys are removed:
   • [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\PINF]
   • [HKCR\CLSID\{E6FB5E20-DE35-11CF-9C87-00AA005127ED}\InProcServer32]

Email It contains an integrated SMTP engine in order to send emails. A direct connection with the destination server will be established. The characteristics are described in the following:

Exploit:
In some cases it makes use of the following vulnerability:
– MS01-020 (Incorrect MIME Header Can Cause IE to Execute E-mail Attachment)

From:
The sender address is spoofed.

To:
– Email addresses found in specific files on the system.

Subject:
The subject of the email is constructed out of the following:

    It starts with one of the following:
   • Delivery Bot
   • Server Error
   • Deliver Mail
   • Delivery Failed
   • Unknown Exception
   • Failed
   • Failure
   • Status
   • Error
   • Delivered Message
   • Mail System
   • Mail Delivery System
   • Mail Delivery failure
   • Delivery
   • Delivery Failure
   • Delivery Error

    Continued by one of the following:
   • %receiver's email address%

Body:

The body of the email is the following:

   • Delivery Agent - Translation failed

     ------------- failed message -------------
     %random character string%

   • Delivery Failure - Invalid mail specification

     ------------- failed message -------------
     %random character string%

   • Mail Delivery Failure - This mail couldn't be shown.

     ------------- failed message -------------
     %random character string%

   • Mail Delivery Failure - This mail couldn't be shown.

     ------------- failed message -------------
     %random character string%

   • Mail Delivery System - This mail contains binary characters

     ------------- failed message -------------
     %random character string%

   • Mail Transaction Failed - This mail couldn't be converted

     ------------- failed message -------------
     %random character string%

   • Mail Delivery Error - This mail contains unicode characters

     ------------- failed message -------------
     %random character string%

   • Mail Delivery Failed - This mail couldn't be represented

     ------------- failed message -------------
     %random character string%

   • Mail Delivery - This mail couldn't be displayed

     ------------- failed message -------------
     %random character string%

Continued by the following:

   • Note: Received message has been sent as a binary file.

   • Modified message has been sent as a binary attachment.

   • Received message has been sent as an encoded attachment.

   • Translated message has been attached.

   • Message has been sent as a binary attachment.

   • Received message has been attached.

   • Partial message is available and has been sent as a binary attachment.

   • The message has been sent as a binary attachment.

Sometimes continued by the following:

   • Or you can view this message at:

     www.%recipient's domain%/inmail%receiver's domain name from email address% /mread.php/sessionid-%several random numbers from 0 to 9%

Attachment:
The filename of the attachment is constructed out of the following:

– It starts with one of the following:
   • data
   • mail
   • msg
   • message

Sometimes continued by one of the following:
   • %several random numbers from 0 to 9%

    The file extension is one of the following:
   • .pif
   • .zip

Here are a few examples of how the filename of the attachment might look like:
   • mail3729.zip
   • data14025.pif
   • message.pif

The email may look like one of the following:

Mailing Search addresses:
It searches the following files for email addresses:
   • .ppt; .xls; .stm; .ods; .nch; .mmf; .mht; .mdx; .mbx; .cfg; .xml;
      .wsh; .jsp; .html; .htm; .pl; .dbx; .tbb; .adb; .dhtm; .cgi; .shtm;
      .uin; .rtf; .vbs; .msg; .oft; .sht; .doc; .wab; .asp; .php; .txt; .eml

Avoid addresses:
It does not send emails to addresses containing one of the following strings:
   • reports@; spam@; noreply@; @viruslis; ntivir; @sophos; @freeav;
      @pandasof; @skynet; @messagel; abuse@; @fbi; @norton; @f-pro;
      @kaspersky; @mcafee; @norman; @bitdefender; @f-secur; @avp; @spam;
      @symantec; @antivi; @microsof

DoS it performs DoS attacks against the following destinations:
   • www.edonkey2000.com
   • www.kazaa.com
   • www.emule-project.net
   • www.cracks.am
   • www.cracks.st

Miscellaneous Mutex:
It creates the following Mutex:
   • _-oOaxX|-+S+-+k+-+y+-+N+-+e+-+t+-|XxKOo-_

String:
Furthermore it contains the following strings:
   • We are the only SkyNet, we don't have any criminal inspirations.
   • Due to many reports, we do not have any backdoors included for spam relaying.
   • and we aren't children. Due to this, many reports are wrong.
   • We don't use any virus creation toolkits, only the higher language
   • Microsoft Visual C++ 6.0. We want to prevent hacker,.
   • cracking, sharing with illegal stuff and similar illegal content.
   • Hey, big firms only want to make a lot of money.
   • That is what we don't prefer. We want to solve and avoid it.
   • Note: Users do not need a new av-update, they need
   • a better education! We will envolope...
   • - Best regards, the SkyNet Antivirus Team, Russia 05:11 P.M -

File details Programming language:
The malware program was written in MS Visual C++.

Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

See a brief description here.

Description inserted by Andrei Gherman on Thu, 29 Sep 2005 13:35 (GMT+1)
Description updated by Andrei Gherman on Fri, 30 Sep 2005 10:39 (GMT+1)

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