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Win32.HLLW.Texmer.735

Added to the Dr.Web virus database: 2010-05-19

Virus description added:

Technical Information

To ensure autorun and distribution:
Modifies the following registry keys:
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'Yahoo Messengger' = '<SYSTEM32>\SCVHSOT.exe'
  • [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'Explorer.exe SCVHSOT.exe'
Creates or modifies the following files:
  • %WINDIR%\Tasks\At1.job
Creates the following files on removable media:
  • <Drive name for removable media>:\autorun.inf
  • <Drive name for removable media>:\SCVHSOT.exe
  • <Drive name for removable media>:\New Folder.exe
Malicious functions:
To complicate detection of its presence in the operating system,
blocks execution of the following system utilities:
  • Windows Task Manager (Taskmgr)
  • Registry Editor (RegEdit)
Executes the following:
  • '<SYSTEM32>\at.exe' 09:00 /interactive /EVERY:m,t,w,th,f,s,su <SYSTEM32>\blastclnnn.exe
  • '<SYSTEM32>\at.exe' /delete /yes
Terminates or attempts to terminate
the following system processes:
  • <SYSTEM32>\cmd.exe
Modifies settings of Windows Explorer:
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 'NofolderOptions' = '00000001'
Modifies file system :
Creates the following files:
  • <SYSTEM32>\setting.ini
  • %HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\KHMHGZ4F\setting[1].doc
  • %HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\2VAZY7AN\setting[1].doc
  • %HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\U98D4X8H\setting[1].doc
  • <SYSTEM32>\autorun.ini
  • %WINDIR%\hinhem.scr
  • <SYSTEM32>\SCVHSOT.exe
  • <SYSTEM32>\blastclnnn.exe
  • %WINDIR%\SCVHSOT.exe
Sets the 'hidden' attribute to the following files:
  • <SYSTEM32>\setting.ini
  • <Drive name for removable media>:\autorun.inf
  • <SYSTEM32>\autorun.ini
  • <SYSTEM32>\SCVHSOT.exe
  • <SYSTEM32>\blastclnnn.exe
Network activity:
Connects to:
  • 'www.fr###ebs.com':80
  • 'se####g3.9999mb.com':80
  • 'se#####3.yeahost.com':80
TCP:
HTTP GET requests:
  • www.fr###ebs.com/setting3/setting.doc
  • se####g3.9999mb.com/setting.doc
  • se#####3.yeahost.com/setting.doc
UDP:
  • DNS ASK www.fr###ebs.com
  • DNS ASK se####g3.9999mb.com
  • DNS ASK se#####3.yeahost.com
Miscellaneous:
Searches for the following windows:
  • ClassName: 'Indicator' WindowName: '(null)'
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