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Date discovered:12/05/2010
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Medium
Damage Potential:Low to medium
Static file:Yes
File size:772.608 Bytes
MD5 checksum:cc1d492a772b8572c27edaa4c29e5d86
IVDF version:

 General Methods of propagation:
   • Autorun feature
   • Peer to Peer

   •  Sophos: Mal/CryptBox-A
   •  Bitdefender: Win32.Worm.Merond.A
   •  Panda: Bck/Spybot.AKG
   •  Eset: Win32/Merond.AC

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

Side effects:
   • Drops malicious files
   • Registry modification

 Files It copies itself to the following locations:
   • %drive%\dir\install\install\jtdll.exe
   • %drive%\RECYCLER\%CLSID%\jtdll.exe

It overwrites a file.
– C:\dir\install\install\jtdll.exe

It deletes the initially executed copy of itself.

It deletes the following file:
   • %TEMPDIR%\XX--XX--XX.txt

The following files are created:

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


It tries to executes the following files:

– Filename:
   • "%PROGRAM FILES%\Internet Explorer\iexplore.exe"

– Filename:
   • "c:\dir\install\install\jtdll.exe"

 Registry The following registry key is added:

The following registry keys are changed:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\
   New value:
   • "Policies"="c:\dir\install\install\jtdll.exe"

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   New value:
   • "HKCU"="c:\dir\install\install\jtdll.exe"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   New value:
   • "HKLM"="c:\dir\install\install\jtdll.exe"

– [HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\
   New value:
   • "Policies"="c:\dir\install\install\jtdll.exe"

 P2P In order to infect other systems in the Peer to Peer network community the following action is performed:   It retrieves shared folders by querying the following registry keys:
   • \software\Morpheus
   • \software\Xolox
   • \software\Xolox
   • \software\Shareaza
   • \software\LimeWire

 Backdoor The following port is opened:

– javaupdate.ser**********.org on TCP port 443

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

Descrizione inserita da Petre Galan su venerdì 27 agosto 2010
Descrizione aggiornata da Petre Galan su venerdì 27 agosto 2010

Indietro . . . .