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Virus:TR/Drop.Muha.462027
Date discovered:17/12/2008
Type:Trojan
Subtype:Dropper
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Low
Static file:Yes
File size:462.050 Bytes
MD5 checksum:4f30003916cc70fca3ce6ec3f0ff1429
IVDF version:7.01.00.249 - Wednesday, December 17, 2008

 General Method of propagation:
    Autorun feature


Aliases:
   •  Mcafee: W32/Autorun.worm.h
   •  Sophos: W32/AHKHeap-A
   •  Panda: W32/AHKHeap.A.worm
   •  Eset: Win32/AHKHeap.A
   •  Bitdefender: Win32.Worm.Ahkheap.C


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


Side effects:
   • Drops malicious files
   • Registry modification

 Files It copies itself to the following location:
   • %drive%\MicrosoftPowerPoint.exe



The following files are created:

C:\heap41a\offspring\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%

%drive%\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%

%TEMPDIR%\MicrosoftPowerPoint\svchost.exe
C:\heap41a\Icon.ico
C:\heap41a\script1.txt Further investigation pointed out that this file is malware, too. Detected as: TR/AutoHK.A

C:\heap41a\drivelist.txt
%TEMPDIR%\MicrosoftPowerPoint\Install.txt Further investigation pointed out that this file is malware, too. Detected as: TR/Agent.aoe.1

C:\heap41a\2.mp3
%TEMPDIR%\MicrosoftPowerPoint\drivelist.txt
C:\heap41a\std.txt Further investigation pointed out that this file is malware, too. Detected as: Worm/AHKHeap.B

C:\heap41a\svchost.exe
C:\heap41a\reproduce.txt Further investigation pointed out that this file is malware, too. Detected as: Worm/AHKHeap.C

%TEMPDIR%\MicrosoftPowerPoint\Icon.ico
%TEMPDIR%\MicrosoftPowerPoint\2.mp3
%TEMPDIR%\MicrosoftPowerPoint\pathlist.txt Further investigation pointed out that this file is malware, too. Detected as: Worm/AHKHeap.A

 Registry The following registry key is added:

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\
   Run]
   • "status"="present"
   • "winlogon"="C:\heap41a\svchost.exe C:\heap41a\std.txt"



The following registry key is changed:

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
   Folder\Hidden\SHOWALL]
   New value:
   • "checkedvalue"=dword:0x00000000

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

Descripción insertada por Petre Galan el jueves 11 de marzo de 2010
Descripción actualizada por Petre Galan el jueves 11 de marzo de 2010

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