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Scareg is a worm virus spreading through removable drives (i.e. floppy disks, zip disks etc.). The worm itself is a Windows PE EXE file about 372Kb in size, written in Delphi.
The worm installs itself into the system twice.
First, it moves the original SCANREGW.EXE file from the Windows directory to the Windows system directory:
Windows\SCANREGW.EXE -> Windows\SYSTEM\SCANREGW.EXEand overwrites the original SCANREGW.EXE file with its (worm) copy.
Second, the worm copies itself to Windows directory under the name: \MEDIA\IDH_001.exe
The worm then creates or modifies the existing registry auto-run key:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run
ScanRegistry = %WindowsDir%\Scanregw.exe
To spread further the worm gets the list of all removable drives (floppy disks, zip drives etc.) and copies itself there under the name HDD.EXE.

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