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Virus:TR/Cycbot.1.4
Date discovered:21/09/2011
Type:Trojan
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:183.296 Bytes
MD5 checksum:C4531A39033D318C7AFEF4565D02640B
VDF version:7.11.15.03 - Wednesday, September 21, 2011
IVDF version:7.11.15.03 - Wednesday, September 21, 2011

 General Aliases:
   •  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:
   • Drops files
   • Registry modification

 Files It copies itself to the following location:
   • %APPDATA%\Microsoft\conhost.exe

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

–  [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "conhost"="%APPDATA%\Microsoft\conhost.exe"



The following registry keys are added:

– [HKLM\SYSTEM\CurrentControlSet\Hardware Profiles\Current\Software\
   Microsoft\windows\CurrentVersion\Internet Settings]
   • "ProxyEnable"=dword:00000001

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
   • "ProxyServer"="http=127.0.0.1:%number%"



The following registry key is changed:

Lower security settings from Internet Explorer:

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

 File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with the following runtime packer:
   • UPX

Description inserted by Andrei Ilie on Monday, October 31, 2011
Description updated by Andrei Ilie on Tuesday, November 1, 2011

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