Virus:WORM/Esfury.A.91
Date discovered:29/06/2010
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:40.960 Bytes
MD5 checksum:805cad883ad580cd2bcc5347b2ef431a
VDF version:7.10.03.196
IVDF version:7.10.08.214 - Tuesday, June 29, 2010

 General Methods of propagation:
   • Autorun feature
   • Mapped network drives


Aliases:
   •  Kaspersky: Trojan.Win32.VB.agxe
   •  TrendMicro: WORM_VBNA.AC
   •  Sophos: Mal/SillyFDC-F
   •  Microsoft: Worm:Win32/Esfury.A
   •  Panda: W32/Esfury.A
   •  VirusBuster: Trojan.VB.JSZE
   •  Eset: Win32/AutoRun.VB.QQ
   •  Sunbelt: Worm.Win32.Esfury
   •  AhnLab: Win32/Esfury.worm.40960
   •  DrWeb: Win32.HLLW.Autoruner.25669
   •  Fortinet: W32/VB.AGXE!tr
   •  Ikarus: Trojan.Win32.VB
   •  Norman: W32/Silly.BX


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003
   • Windows Vista
   • Windows 7


Side effects:
   • Lowers security settings
   • Downloads a file
   • Downloads malicious files
   • Registry modification

 Files It copies itself to the following locations:
   • %HOME%\%username%1\winlogon.exe
   • %drive%\drivesguideinfo\svchost.exe



The following file is created:

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

– %HOME%\%username%1\VERSION.TXT This is a non malicious text file with the following content:
   • 195




It tries to download some files:

– The location is the following:
   • http://0-0-1-0-0-1-0-0-1-1-1-1-0-1-0-**********
It is saved on the local hard drive under: %HOME%\%username%1\WLO.EXE Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too.

– The location is the following:
   • http://0-0-1-0-0-0-1-0-1-0-0-1-0-0-**********
It is saved on the local hard drive under: %HOME%\%username%1\winhelp32.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: WORM/VBNA.B.370

 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%\%username%1\winlogon.exe"

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

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

Description inserted by Alexandru Dinu on Thursday, August 12, 2010
Description updated by Alexandru Dinu on Thursday, August 12, 2010

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