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Virus:Worm/Esfury.A.74
Date discovered:21/06/2010
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:36.864 Bytes
MD5 checksum:5477352343788c9911238911fe41dc7c
VDF version:7.10.03.162
IVDF version:7.10.08.131 - Monday, June 21, 2010

 General Aliases:
   •  Bitdefender: Worm.Generic.254150
   •  Panda: W32/Esfury.A
   •  Eset: Win32/AutoRun.VB.RJ


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


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

 Files It copies itself to the following location:
   • %HOME%\%current username%1\winlogon.exe




It tries to download a file:

– The location is the following:
   • http://%hex values%-1-1-1-1-1-1-1-1-.0-0-0-0-0-0-0-0-0-0-0-0-0-%second%-0-0-0-0-0-0-0-0-0-0-0-0-0.info/**********




It tries to execute the following file:

– Filename:
   • %HOME%\%current username%1\winlogon.exe

 Registry The following registry keys are added in order to run the processes after reboot:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "NVIDIA Media Center Library"="%HOME%\%current username%1\winlogon.exe"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "NVIDIA Media Center Library"="%HOME%\%current username%1\winlogon.exe"

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


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

Description inserted by Petre Galan on Thursday, January 6, 2011
Description updated by Petre Galan on Friday, January 7, 2011

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