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Date discovered:14/07/2011
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Medium
Static file:Yes
File size:200.192 Bytes
MD5 checksum:BC84DE104E76468759C27EFA002F6FB9
VDF version:
IVDF version:

 General Method of propagation:
   • No own spreading routine

   •  TrendMicro: BKDR_CYCBOT.SME3
   •  Sophos: Troj/FakeAV-EFL
   •  Microsoft: Backdoor:Win32/Cycbot.G

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

Side effects:
   • Third party control
   • Drops files
   • Lowers security settings
   • Registry modification
   • Steals information

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

It modifies the following file:
   • %APPDATA%\Mozilla\Firefox\Profiles\%random character string%.default\prefs.js
As a result various security mechanisms are disabled.

The following file is created:

– %APPDATA%\%hex values%.%hex values% Contains parameters used by the malware.

 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%"="%ALLUSERSPROFILE%\Application Data\%random character string%.exe"

The following registry keys are added:

– [HKEY_CURRENT_CONFIG\Software\Microsoft\windows\CurrentVersion\
   Internet Settings]
   • "ProxyEnable"=dword:00000001

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system]
   • "DisableTaskMgr"=dword:00000001

– [HKCU\Software\Microsoft\Internet Explorer\Download]
   • "CheckExeSignatures"="no"

The following registry keys are changed:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
   New value:
   • "MigrateProxy"=dword:00000001
   • "ProxyEnable"=dword:00000001
   • "ProxyServer"="http="

Various Explorer settings:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "Hidden"=dword:00000000
   • "ShowSuperHidden"=dword:00000000

 Process termination Processes with one of the following strings are terminated:
   • Alwil Software*; avast; Avast*; AvastUI.exe; AVG; avgnt.exe; avira;
      Avira*; BitDefender; ccsvchst.exe; Dr.Web; ESET NOD32; Kaspersky;
      mcafee; McAfee*; mcagent.exe; none; norton; Norton*; Symantec*

 Backdoor The following ports are opened:

%executed file% on a random TCP port in order to provide a proxy server.
%executed file% on a random TCP port in order to provide backdoor capabilities.

 Stealing – It uses a network sniffer that checks for the following string:
   • google

 Miscellaneous Accesses internet resources:
   • **********

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

Description inserted by Andrei Ilie on Monday, October 24, 2011
Description updated by Andrei Ilie on Tuesday, October 25, 2011

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