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Virus:Worm/Dorkbot.A.83
Date discovered:16/05/2011
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:Yes
File size:92.842 Bytes
MD5 checksum:191d9416f30f2f38c9467d71e53676a6
VDF version:7.11.08.23 - Monday, May 16, 2011
IVDF version:7.11.08.23 - Monday, May 16, 2011

 General Methods of propagation:
    Autorun feature
    Messenger


Aliases:
   •  Kaspersky: Backdoor.Win32.Ruskill.bd
   •  F-Secure: Trojan.Generic.KD.223028
   •  Bitdefender: Trojan.Generic.KD.223028
     GData: Trojan.Generic.KD.223028


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Third party control
   • Drops malicious files
   • Registry modification
   • Steals information
   • Makes use of software vulnerability
CVE-2007-1204
MS07-019

 Files It copies itself to the following locations:
   • %HOME%\Application Data\Niueur.exe
   • %drive%\RECYCLER\Niueur.exe



It deletes the initially executed copy of itself.



The following file is created:

%drive%\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%




It tries to execute the following file:

Filename:
   • %HOME%\Application Data\Niueur.exe

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "Niueur"="%HOME%\Application Data\Niueur.exe"



The following registry keys are changed:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .wma\OpenWithProgids]
   New value:
   • "WMAFile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .mp3\OpenWithProgids]
   New value:
   • "mp3file"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .rtf\OpenWithProgids]
   New value:
   • "rtffile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .jpeg\OpenWithProgids]
   New value:
   • "jpegfile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .tiff\OpenWithProgids]
   New value:
   • "TIFImage.Document"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .jpe\OpenWithProgids]
   New value:
   • "jpegfile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .wmv\OpenWithProgids]
   New value:
   • "WMVFile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .wpl\OpenWithProgids]
   New value:
   • "WPLFile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .mpg\OpenWithProgids]
   New value:
   • "mpegfile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .txt\OpenWithProgids]
   New value:
   • "txtfile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .m3u\OpenWithProgids]
   New value:
   • "m3ufile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .avi\OpenWithProgids]
   New value:
   • "avifile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .mpv2\OpenWithProgids]
   New value:
   • "mpegfile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .png\OpenWithProgids]
   New value:
   • "pngfile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .wav\OpenWithProgids]
   New value:
   • "soundrec"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .ivf\OpenWithProgids]
   New value:
   • "IVFfile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .css\OpenWithProgids]
   New value:
   • "CSSfile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .xml\OpenWithProgids]
   New value:
   • "xmlfile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .wm\OpenWithProgids]
   New value:
   • "ASFFile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .tif\OpenWithProgids]
   New value:
   • "TIFImage.Document"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .asf\OpenWithProgids]
   New value:
   • "ASFFile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .wmx\OpenWithProgids]
   New value:
   • "ASXFile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .mpe\OpenWithProgids]
   New value:
   • "mpegfile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .jpg\OpenWithProgids]
   New value:
   • "jpegfile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .doc\OpenWithProgids]
   New value:
   • "WordPad.Document.1"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .mp2v\OpenWithProgids]
   New value:
   • "mpegfile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .aif\OpenWithProgids]
   New value:
   • "AIFFFile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .jfif\OpenWithProgids]
   New value:
   • "pjpegfile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .ico\OpenWithProgids]
   New value:
   • "icofile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .mpeg\OpenWithProgids]
   New value:
   • "mpegfile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .snd\OpenWithProgids]
   New value:
   • "AUFile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .aifc\OpenWithProgids]
   New value:
   • "AIFFFile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .wmf\OpenWithProgids]
   New value:
   • "wmffile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .m1v\OpenWithProgids]
   New value:
   • "mpegfile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .dvr-ms\OpenWithProgids]
   New value:
   • "WMP.DVR-MSFile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .gif\OpenWithProgids]
   New value:
   • "giffile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .wvx\OpenWithProgids]
   New value:
   • "WVXFile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .midi\OpenWithProgids]
   New value:
   • "midfile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .au\OpenWithProgids]
   New value:
   • "AUFile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .wax\OpenWithProgids]
   New value:
   • "WAXFile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .aiff\OpenWithProgids]
   New value:
   • "AIFFFile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .mid\OpenWithProgids]
   New value:
   • "midfile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .htm\OpenWithProgids]
   New value:
   • "htmlfile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .bmp\OpenWithProgids]
   New value:
   • "Paint.Picture"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .rmi\OpenWithProgids]
   New value:
   • "midfile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .xsl\OpenWithProgids]
   New value:
   • "xslfile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .mpa\OpenWithProgids]
   New value:
   • "mpegfile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .asx\OpenWithProgids]
   New value:
   • "ASXFile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .html\OpenWithProgids]
   New value:
   • "htmlfile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .zip\OpenWithProgids]
   New value:
   • "CompressedFolder"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .wri\OpenWithProgids]
   New value:
   • "wrifile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .emf\OpenWithProgids]
   New value:
   • "emffile"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .dib\OpenWithProgids]
   New value:
   • "Paint.Picture"=""

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\
   .mp2\OpenWithProgids]
   New value:
   • "mpegfile"=""

 Messenger It is spreading via Messenger. The characteristics are described below:

 Windows Messenger

The URL then refers to a copy of the described malware. If the user downloads and executes this file the infection process will start again.

 IRC To deliver system information and to provide remote control it connects to the following IRC Servers:

Server: ng.mar**********.com
Port: 3800

Server: ng.the**********.com
Port: 3800

Server: ng.gra**********.com
Port: 3800

Server: ng.lig**********.com
Port: 3800

Server: ng.coa**********.com
Port: 3800

 Stealing It tries to steal the following information:
 Passwords typed into 'password input fields'

A logging routine is started after the following website is visited, which contains one of the following substrings in the URL:
   • *officebanking.cl/*login.asp*; *secure.logmein.*/*logincheck*;
      *megaupload.*/*login; *fileserve.*/login*; *twitter.com/sessions;
      *.alertpay.*/*login.aspx; *.moneybookers.*/*login.pl;
      *runescape*/*weblogin*; *dyndns*/account*; *no-ip*/login*;
      *steampowered*/login*; *hackforums.*/member.php;
      *facebook.*/login.php*; *login.yahoo.*/*login*;
      *login.live.*/*post.srf*; *gmx.*/*FormLogin*; *fastmail.*/mail/*;
      *bigstring.*/*index.php*; *screenname.aol.*/login.psp*;
      *aol.*/*login.psp*; *google.*/*ServiceLoginAuth*;
      *paypal.*/webscr?cmd=_login-submit*

 Injection It injects itself as a remote thread into a process.

    Process name:
   • csrss.exe



It injects itself as a remote thread into a process.

It is injected into all processes.


 Miscellaneous Accesses internet resources:
   • http://api.wip**********.com/


Mutex:
It creates the following Mutexes:
   • djQPssJO4SAQzkgw
   • t2f-Mutex

 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.

說明撰寫者 Petre Galan 開啟 2011年7月5日星期二
說明更新者 Petre Galan 開啟 2011年7月5日星期二

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