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Virus:TR/Drop.Sirefef.B.746
Date discovered:08/09/2011
Type:Trojan
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:204.800 Bytes
MD5 checksum:df99272c578ca11d343058ef587da81c
VDF version:7.11.14.146 - Thursday, September 8, 2011
IVDF version:7.11.14.146 - Thursday, September 8, 2011

 General Aliases:
   •  Mcafee: Artemis!DF99272C578C
   •  Sophos: Mal/EncPk-AAI
   •  Microsoft: TrojanDropper:Win32/Sirefef.B


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


Side effects:
   • Drops files
   • Registry modification

 Files It deletes the initially executed copy of itself.



The following files are created:

%SYSDIR%\drivers\%random character string%.sys
%WINDIR%\1568498089:1453228706.exe

 Registry The following registry keys are added in order to load the service after reboot:

– [HKLM\SYSTEM\ControlSet001\Services\a9617d5d]
   • "Type"=dword:00000001
   • "Start"=dword:00000003
   • "ImagePath"="\systemroot\1568498089:1453228706.exe"

– [HKLM\SYSTEM\CurrentControlSet\Services\a9617d5d]
   • "Type"=dword:00000001
   • "Start"=dword:00000003
   • "ImagePath"="\systemroot\1568498089:1453228706.exe"

 Miscellaneous Accesses internet resources:
   • **********.229.100.68:80; clock.fihn.net; clock.isc.org;
      ntp.adc.am; ntp.crifo.org; ntp.duckcorp.org; ntp.ucsd.edu;
      ntp1.arnes.si; ntp2.usno.navy.mil; time.cerias.purdue.edu;
      time.windows.com; time2.one4vision.de; tock.usask.ca; wwv.nist.gov

 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 Friday, September 16, 2011
Description updated by Andrei Ilie on Monday, September 19, 2011

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