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Win32.HLLW.Silka.136
Added to the Dr.Web virus database:
2013-04-02
Virus description added:
2014-11-02
Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
[<HKLM>\SOFTWARE\Microsoft\Active Setup\Installed Components\{8FEBFAE4-EDB5-3FEA-2D69-68374FB23DD5}] 'StubPath' = '%TEMP%\server2.exe'
[<HKCU>\Software\Microsoft\Active Setup\Installed Components\{8FEBFAE4-EDB5-3FEA-2D69-68374FB23DD5}] 'StubPath' = '%TEMP%\server2.exe'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'WinProtect' = '%TEMP%\server2.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\run] 'WinProtect' = '%TEMP%\server2.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'WinProtect' = '%TEMP%\server2.exe'
Malicious functions:
To bypass firewall, removes or modifies the following registry keys:
[<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%TEMP%\server2.exe' = '%TEMP%\server2.exe:*:Enabled:Windows Messanger'
[<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile] 'DoNotAllowExceptions' = '00000000'
[<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '<Full path to virus>' = '<Full path to virus>:*:Enabled:Windows Messanger'
Executes the following:
'<SYSTEM32>\reg.exe' ADD HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List /v "%TEMP%\server2.exe" /t REG_SZ /d "%TEMP%\server2.exe:*:Enabled:Windows Messanger" /f
'<SYSTEM32>\reg.exe' ADD HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List /v "<Full path to virus>" /t REG_SZ /d "<Full path to virus>:*:Enabled:Windows Messanger" /f
'<SYSTEM32>\reg.exe' ADD HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile /v "DoNotAllowExceptions" /t REG_DWORD /d "0" /f
Injects code into
the following system processes:
Modifies file system :
Creates the following files:
%TEMP%\data.dat
%TEMP%\server2.exe
Network activity:
Connects to:
'<Private IP address>':3080
'yz#.#o-ip.biz':3080
UDP:
Miscellaneous:
Searches for the following windows:
ClassName: 'Indicator' WindowName: ''
ClassName: 'shell_traywnd' WindowName: ''
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