Monday, June 3, 2013

EICAR Test File

The EICAR Standard Anti-Virus Test File or EICAR test file is a computer file that was developed by the European Institute for Computer Antivirus Research (EICAR) and Computer Antivirus Research Organization (CARO), to test the response of computer antivirus (AV) programs. Instead of using real malware, which could do real damage, this test file allows people to test anti-virus software without having to use a real computer virus.
Anti-virus programmers set the EICAR string as a verified virus, similar to other identified signatures. A compliant virus scanner, when detecting the file, will respond in exactly the same manner as if it found a harmful virus. Not all virus scanners are compliant, and may not detect the file even when they are correctly configured.
The use of the EICAR test string can be more versatile than straightforward detection: a file containing the EICAR test string can be compressed or archived, and then the antivirus software can be run to see whether it can detect the test string in the compressed file.

How this File was Designed?
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:

You can download the EICAR File from the Official Site, here You can choose various scenarios:

If you have an Internet Security Suite, this application may prevent the download of the EICAR Files from the Official Website.

In that case You can make your own EICAR File following this steps:
  1. Open a new Notepad.
  2. Copy & Paste this String in the Notepad (Please be sure that all the caracters are correct): X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*
  3. Save your new file as "" (It is important the .com extension)
  4. Just at the moment that you save this file, your Anti-Malware Suite should detect it as a threat, if not, you can run a custom scan to verify the effectiveness of your AV.
More Info: