Win32.HLLW.Silka.139

Added to the Dr.Web virus database: 2013-04-15

Virus description added: 2013-04-25

To ensure autorun and distribution:

Modifies the following registry keys:

[<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'MSWUpdate' = '"%APPDATA%\lsass.exe"'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'MSWUpdate' = '"%APPDATA%\lsass.exe"'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'Explorer.exe "%APPDATA%\lsass.exe"'

Malicious functions:

Creates and executes the following:

Executes the following:

<SYSTEM32>\dumprep.exe 2664 -dm 7 7 %TEMP%\WER51e6.dir00\lsass.exe.hdmp 16325836412027384
<SYSTEM32>\dumprep.exe 2664 -dm 7 7 %TEMP%\WER51e6.dir00\lsass.exe.mdmp 16325836412027364
<SYSTEM32>\netsh.exe firewall add allowedprogram program = %APPDATA%\lsass.exename = Nero mode = ENABLE

Modifies file system :

Creates the following files:

Sets the 'hidden' attribute to the following files:

Network activity:

Connects to:

UDP:

Miscellaneous:

Searches for the following windows: