EICAR Test File is not a malicious program but a special text file designed to test anti-virus programs’ response. At detecting this file, anti-virus scanners should react in exactly the same way as if it were a virus. The file allows users to test their anti-virus software without having to put their computer at risk of infection.
EICAR Test File is usually a text file in the ASCII format, containing the following line:
If such file appended with the .COM extension is launched on 32-bit operating system as an application, it prints the following message to the command-line console:
Then it returns control to the operating system. Yet, the .COM file cannot be launched on 64-bit Windows.