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Win32.HLLW.Autoruner.53925

Added to the Dr.Web virus database: 2011-07-10

Virus description added:

Technical Information

To ensure autorun and distribution:
Modifies the following registry keys:
  • [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] '' = '"%APPDATA%\Local\Microsoft\CurrentVersion\winlogon.exe"'
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'HKCU' = '"%APPDATA%\Local\Microsoft\CurrentVersion\winlogon.exe"'
Creates the following files on removable media:
  • <Drive name for removable media>:\autorun.inf
  • <Drive name for removable media>:\temp\sys32.exe
Malicious functions:
To complicate detection of its presence in the operating system,
forces the system hide from view:
  • hidden files
  • file extensions
blocks the following features:
  • System Restore (SR)
  • User Account Control (UAC)
Creates and executes the following:
  • %APPDATA%\Local\Microsoft\CurrentVersion\winlogon.exe 
Executes the following:
  • <SYSTEM32>\rundll32.exe InetCpl.cpl,ClearMyTracksByProcess 2
Terminates or attempts to terminate
the following user processes:
  • zlclient.exe
  • outpost.exe
  • bdagent.exe
Modifies file system :
Creates the following files:
  • %TEMP%\StartupImage.jpeg
  • %TEMP%\cdinformation.txt
  • %APPDATA%\Local\Microsoft\CurrentVersion\winlogon.exe
Sets the 'hidden' attribute to the following files:
  • <Drive name for removable media>:\temp\sys32.exe
Network activity:
Connects to:
  • 'sm##.gmail.com':587
UDP:
  • DNS ASK sm##.gmail.com
Miscellaneous:
Searches for the following windows:
  • ClassName: 'Shell_TrayWnd' WindowName: ''
  • ClassName: '' WindowName: 'Windows Task Manager'
  • ClassName: 'Indicator' WindowName: ''
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