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Win32.HLLW.Autoruner2.64701

Added to the Dr.Web virus database: 2019-10-09

Virus description added:

Technical Information

To ensure autorun and distribution
Modifies the following registry keys
  • [<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'Explorer.exe winfiles.exe'
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'Yahoo Messengger' = '%WINDIR%\SysWOW64\winfiles.exe'
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] '41c871254570a1cced54213f6247ea78' = '"%APPDATA%\Skype.exe" ..'
  • [<HKLM>\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Run] '41c871254570a1cced54213f6247ea78' = '"%APPDATA%\Skype.exe" ..'
Creates or modifies the following files
  • %WINDIR%\tasks\at1.job
  • <SYSTEM32>\tasks\at1
  • %APPDATA%\microsoft\windows\start menu\programs\startup\41c871254570a1cced54213f6247ea78.exe
Creates the following files on removable media
  • <Drive name for removable media>:\winfiles.exe
  • <Drive name for removable media>:\autorun.inf
Malicious functions
To complicate detection of its presence in the operating system,
forces the system hide from view:
  • hidden files
  • file extensions
blocks execution of the following system utilities:
  • Windows Task Manager (Taskmgr)
  • Registry Editor (RegEdit)
blocks the following features:
  • System Restore (SR)
Executes the following
  • '%WINDIR%\syswow64\at.exe' /delete /yes
  • '%WINDIR%\syswow64\at.exe' 09:00 /interactive /EVERY:m,t,w,th,f,s,su %WINDIR%\SysWOW64\winfiles.exe
  • '%WINDIR%\syswow64\netsh.exe' firewall add allowedprogram "%APPDATA%\Skype.exe" "Skype.exe" ENABLE
Injects code into
the following user processes:
  • winnt.exe
Forces autoplay for removable media.
Modifies file system
Creates the following files
  • %WINDIR%\syswow64\winfiles.exe
  • %APPDATA%\microsoft\windows\cookies\low\index.dat
  • <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\opx15eep\desktop.ini
  • <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\2fx4wksu\desktop.ini
  • <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\8z7azrht\desktop.ini
  • <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\qajda0jb\desktop.ini
  • <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\index.dat
  • <LS_APPDATA>\microsoft\windows\history\low\history.ie5\index.dat
  • <LS_APPDATA>\microsoft\windows\history\low\history.ie5\desktop.ini
  • <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\desktop.ini
  • <LS_APPDATA>\microsoft\windows\<INETFILES>\low\desktop.ini
  • %WINDIR%\syswow64\autorun.ini
  • %WINDIR%\winnt.exe
  • %TEMP%\autc51c.tmp
  • %WINDIR%\winfiles.exe
  • <LS_APPDATA>\microsoft\windows\history\low\desktop.ini
  • %APPDATA%\skype.exe
Sets the 'hidden' attribute to the following files
  • %WINDIR%\syswow64\winfiles.exe
  • %WINDIR%\winfiles.exe
  • %WINDIR%\syswow64\autorun.ini
  • <LS_APPDATA>\microsoft\windows\<INETFILES>\low\desktop.ini
  • <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\desktop.ini
  • <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\qajda0jb\desktop.ini
  • <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\8z7azrht\desktop.ini
  • <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\2fx4wksu\desktop.ini
  • <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\opx15eep\desktop.ini
  • <LS_APPDATA>\microsoft\windows\history\low\history.ie5\desktop.ini
  • <LS_APPDATA>\microsoft\windows\history\low\desktop.ini
  • <Drive name for removable media>:\autorun.inf
Deletes the following files
  • %TEMP%\autc51c.tmp
  • <Drive name for removable media>:\winfiles.exe
  • <Drive name for removable media>:\autorun.inf
Network activity
UDP
  • DNS ASK nh#####nglane3.t35.com
  • DNS ASK an####a.hopto.org
  • DNS ASK nh#####nglane4.t35.com
Miscellaneous
Searches for the following windows
  • ClassName: 'MS_AutodialMonitor' WindowName: ''
  • ClassName: 'MS_WebCheckMonitor' WindowName: ''
Creates and executes the following
  • '%WINDIR%\winnt.exe'
  • '%APPDATA%\skype.exe'
  • '%WINDIR%\syswow64\cmd.exe' /C AT /delete /yes' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C AT 09:00 /interactive /EVERY:m,t,w,th,f,s,su %WINDIR%\SysWOW64\winfiles.exe' (with hidden window)
  • '%WINDIR%\syswow64\netsh.exe' firewall add allowedprogram "%APPDATA%\Skype.exe" "Skype.exe" ENABLE' (with hidden window)
Executes the following
  • '%WINDIR%\syswow64\cmd.exe' /C AT /delete /yes
  • '%WINDIR%\syswow64\cmd.exe' /C AT 09:00 /interactive /EVERY:m,t,w,th,f,s,su %WINDIR%\SysWOW64\winfiles.exe
  • '%WINDIR%\syswow64\rundll32.exe' "%WINDIR%\syswow64\WININET.dll",DispatchAPICall 1

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