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Win32.HLLP.Siggen.14

Added to the Dr.Web virus database: 2011-09-23

Virus description added:

Technical Information

To ensure autorun and distribution:
Modifies the following registry keys:
  • [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Userinit' = '<SYSTEM32>\userinit.exe,<SYSTEM32>\wuauclt.exe,'
Creates or modifies the following files:
  • %HOMEPATH%\Start Menu\Programs\Startup\wuauclt.exe.lnk
Infects the following executable system files:
  • <SYSTEM32>\sndrec32.exe
  • <SYSTEM32>\sndvol32.exe
  • <SYSTEM32>\taskmgr.exe
  • <SYSTEM32>\mspaint.exe
  • <SYSTEM32>\wuauclt.exe
  • <SYSTEM32>\calc.exe
  • <SYSTEM32>\notepad.exe
Malicious functions:
To complicate detection of its presence in the operating system,
blocks the following features:
  • System File Checker (SFC)
Executes the following:
  • <SYSTEM32>\wuauclt.exe
Modifies file system :
Creates the following files:
  • %TEMP%\RCXA.tmp
  • %TEMP%\wuaB.tmp
  • %TEMP%\RCX8.tmp
  • %TEMP%\wua9.tmp
  • %TEMP%\RCXE.tmp
  • %TEMP%\wuaF.tmp
  • %TEMP%\RCXC.tmp
  • %TEMP%\wuaD.tmp
  • <SYSTEM32>\wuauclt.ini
  • %TEMP%\wua3.tmp
  • %TEMP%\wua1.tmp
  • %TEMP%\RCX2.tmp
  • %TEMP%\RCX6.tmp
  • %TEMP%\wua7.tmp
  • %TEMP%\RCX4.tmp
  • %TEMP%\wua5.tmp
Deletes the following files:
  • %TEMP%\wua9.tmp
  • %TEMP%\wuaB.tmp
  • %TEMP%\wuaD.tmp
  • %TEMP%\wua7.tmp
  • %TEMP%\wua1.tmp
  • %TEMP%\wua3.tmp
  • %TEMP%\wua5.tmp
Network activity:
Connects to:
  • 'www.up#######crosoft-windows.com':80
TCP:
HTTP GET requests:
  • www.up#######crosoft-windows.com/software/updater/version_checker.php?gu################################################################################################
UDP:
  • DNS ASK www.up#######crosoft-windows.com
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