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Date discovered:11/06/2010
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:Yes
File size:163.840 Bytes
MD5 checksum:e886a4d9b9909639f95a48872c5dbc07
VDF version:
IVDF version: - Friday, June 11, 2010

 General Methods of propagation:
   • Autorun feature
   • Messenger

   •  Kaspersky: Backdoor.Win32.Ruskill.ce
   •  F-Secure: Worm.Generic.327325
   •  Bitdefender: Worm.Generic.327325
   •  GData: Worm.Generic.327325

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

Side effects:
   • Third party control
   • Drops malicious files
   • Registry modification
   • Steals information

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

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

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

The value of the following registry key is removed:

–  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • internat.exe

 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: thi**********.info
Port: 1863
Channel: #80t35ref
Nickname: n{EN|XPa}%random character string%

Server: thi**********.info
Port: 1863
Channel: #80t35ref
Nickname: {EN|XPa}%random character string%

 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:
   • *members*.iknowthatgirl*/members*; **;
      *bcointernacional*login*; *:2086/login*; **user_login*;
      **login*; **; **;
      **Login*; **login*; **;
      **; **ogin*; **;
      **login*; **/signin-do*;
      **/signin-do*; **; **;
      **; **login*; **;
      **login*; **login*; **;
      **; **; **;
      **; **login*; **;
      *megaupload.*/*login*; *depositfiles.*/*/login*; *signin.ebay*SignIn;
      **login.asp*; *secure.logmein.*/*logincheck*;
      *; *.moneybookers.*/*;
      *runescape*/*weblogin*; *dyndns*/account*; *no-ip*/login*;
      *steampowered*/login*; *hackforums.*/member.php;
      *facebook.*/login.php*; **/*login*;
      **/*post.srf*; *gmx.*/*FormLogin*; *fastmail.*/mail/*;
      *bigstring.*/*index.php*; **/login.psp*;
      *aol.*/*login.psp*; *google.*/*ServiceLoginAuth*;

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

It is injected into all processes.

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

 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.

Description insérée par Petre Galan le mercredi 6 juillet 2011
Description mise à jour par Petre Galan le mercredi 6 juillet 2011

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