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Date discovered:30/05/2010
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:575.488 Bytes
MD5 checksum:65feb504a274110a513dce6d1b6a640d
IVDF version:

 General Method of propagation:
   • Autorun feature

   •  Bitdefender: Trojan.Generic.4010642
   •  Panda: Trj/Thed.V

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

Side effects:
   • Downloads malicious files
   • Drops malicious files
   • Registry modification

 Files It copies itself to the following locations:
   • %drive%\%executed file%
   • %ALLUSERSPROFILE%\Application Data\srtserv\%executed file%

The following files are created:

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

– %ALLUSERSPROFILE%\Application Data\srtserv\sdata.dll Further investigation pointed out that this file is malware, too. Detected as: Worm/Autorun.hdf

– %ALLUSERSPROFILE%\Application Data\srtserv\set.dat

It tries to download some files:

– The locations are the following:

– The locations are the following:

It tries to execute the following file:

– Filename:
   • "%ALLUSERSPROFILE%\Application Data\srtserv\%executed file%" -wait

 Registry The values of the following registry keys are removed:

–  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • srtserv

–  [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • srtserv

The following registry key is added:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\MSrtn]
   • "value1"="%executed file%"
   • "value2"=dword:0x000007d4

 Miscellaneous Accesses internet resources:

It creates the following Mutexes:
   • YCS0mRtQ316

 File details Programming language:
The malware program was written in Delphi.

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

Descrição enviada por Petre Galan em sexta-feira, 19 de novembro de 2010
Descrição atualizada por Petre Galan em sexta-feira, 19 de novembro de 2010

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