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Date discovered:21/09/2011
In the wild:Yes
Reported Infections:Low
Distribution Potential:Medium to high
Damage Potential:Medium
Static file:Yes
File size:126.976 Bytes
MD5 checksum:0BE55123C40A8F4AF0A355528551E306
VDF version:
IVDF version:

 General Methods of propagation:
   • Autorun feature
   • Messenger

   •  Kaspersky: Backdoor.Win32.Ruskill.anu
   •  TrendMicro: WORM_DORKBOT.BEE
   •  Sophos: W32/Dorkbot-Q

Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003
   • Windows Vista
   • Windows 7

Side effects:
   • Drops files
   • Registry modification

 Files It copies itself to the following location:
   • %APPDATA%\%random character string%.exe

It deletes the initially executed copy of itself.

It tries to download some files:

– The location is the following:
   • **********.185.246.40/zaberz.exe
At the time of writing this file was not online for further investigation.

– The location is the following:
   • **********
At the time of writing this file was not online for further investigation.

 Registry One of the following values is added in order to run the process after reboot:

–  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "%random character string%"="%APPDATA%\%random character string%.exe"

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

– Windows Live Messenger

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

Server: **********
Port: 3800
Nickname: %random character string%

– This malware has the ability to collect and send information such as:
    • Username
    • Information about the Windows operating system

– Furthermore it has the ability to perform actions such as:
    • connect to IRC server
    • disconnect from IRC server
    • Join IRC channel
    • Leave IRC channel
    • Perform DDoS attack

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

    Process name:
   • %random process%

Access to the following websites is effectively blocked:
   • bitdefender.; bullguard.; garyshood.; gdatasoftware.; kaspersky.;
      malwarebytes.; novirusthanks.;; onlinemalwarescanner.;
      pandasecurity.; precisesecurity.; sunbeltsoftware.; threatexpert.;
      trendmicro.; virusbuster.nprotect.; viruschief.; virustotal.

 Miscellaneous Accesses internet resources:

Anti debugging
Checks for debugger or virtual machine using time related techniques.

 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 Andrei Ilie le lundi 24 octobre 2011
Description mise à jour par Andrei Ilie le mardi 25 octobre 2011

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