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Win32.HLLM.Graz.387

Added to the Dr.Web virus database: 2017-11-22

Virus description added:

Technical Information

To ensure autorun and distribution:
Modifies the following registry keys:
  • [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run] 'ReferenceAssembliesw' = '%ALLUSERSPROFILE%\Reference Assemblies\ReferenceAssembliesw.exe'
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'Ny' = '%APPDATA%\Uninstall Information\Ny.exe'
Malicious functions:
To complicate detection of its presence in the operating system,
blocks execution of the following system utilities:
  • Windows Update
  • Windows Security Center
blocks the following features:
  • Windows Action Center
modifies the following system settings:
  • Hides taskbar notifications
Executes the following:
  • '<SYSTEM32>\msiexec.exe'
Injects code into
the following system processes:
  • <SYSTEM32>\msiexec.exe
Modifies file system:
Creates the following files:
  • %ALLUSERSPROFILE%\Reference Assemblies\ReferenceAssembliesw.exe
  • %APPDATA%\Uninstall Information\Ny.exe
Deletes the following files:
  • %APPDATA%\Uninstall Information\Ny.exe
Deletes itself.
Network activity:
Connects to:
  • '25#.#55.255.255':53
  • '19#.#83.98.154':53
  • '45.##.117.118':53
  • '23.#4.5.133':53
  • '5.###.183.146':53
  • '96.##.175.167':53
  • '10#.#38.186.189':53
  • '84.##1.32.108':53
  • '18#.#33.72.100':53
  • '21#.#61.5.12':53
  • '45.#3.25.55':53
  • '5.#.49.12':53
  • '14#.#6.133.38':53
  • '89.#8.27.34':53
  • '87.##.175.85':53
  • '45.##.28.232':53
  • '10#.#1.164.218':53
  • '14#.#38.157.53':53
  • '45.##.99.180':53