Virus:TR/Drop.MIDI.B.1
Date discovered:29/07/2009
Type:Trojan
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:31.232 Bytes
MD5 checksum:7a045430f894bc702708a08e4b151714
IVDF version:7.10.10.21 - Friday, July 30, 2010

 General Method of propagation:
• Multimedia files


Aliases:
   •  Mcafee: Artemis!7A045430F894
   •  Kaspersky: Trojan-PSW.Win32.Kates.ll
   •  AhnLab: ASD.Prevention
   •  Ikarus: Trojan-Dropper.MIDI


Platforms / OS:
   • Windows 98
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows Vista
   • Windows Server 2008
   • Windows 7


Side effects:
   • Drops a malicious file
   • Registry modification

 Files The following file is created:

– %TEMPDIR%\%random character string%.old Furthermore it gets executed after it was fully created. Further investigation pointed out that this file is malware, too. Detected as: TR/MIDI.B

 Registry The following registry key is changed:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Drivers32]
   New value:
   • "midi9"="%TEMPDIR%\%random character string%.old 0yAAAAAAAA"

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

Description inserted by Carlos Valero Llabata on Wednesday, August 4, 2010
Description updated by Carlos Valero Llabata on Thursday, August 5, 2010

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