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Date discovered:15/07/2011
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Medium
Static file:Yes
File size:187.392 Bytes
MD5 checksum:50558989A6D43317AE90383D72E7395F
VDF version:
IVDF version:

 General Method of propagation:
   • No own spreading routine

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

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:
   • %TEMPDIR%\csrss.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 NT\CurrentVersion\Windows]
   • "Load"="%TEMPDIR%\csrss.exe"

The following registry key is added:

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

The following registry key is changed:

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

 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 Mutex:
It creates the following Mutex:
   • UrlZonesSM_%current username%

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

Description inserted by Andrei Ilie on Wednesday, October 26, 2011
Description updated by Andrei Ilie on Monday, October 31, 2011

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