Design
The file is a text file of either 68 or 70 bytes that is a legitimate executable file called a COM file that can be run by Microsoft operating systems and some work-alikes (except for 64-bit due to 16-bit limitations), including OS/2. When executed, the EICAR test file will print "EICAR-STANDARD-ANTIVIRUS-TEST-FILE!" and then will stop. The test string was engineered to consist of ASCII human-readable characters, easily created using a standard computer keyboard. It makes use of self-modifying code to work around technical issues that this constraint imposes on the execution of the test string.
The EICAR test string reads:
- X5O!P%@AP
Read more about this topic: EICAR Test File
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