Bristol Airport authorities were recently forced to take their flight information system displays offline for two days to contain a ransomware attack Attack.Ransom . The authorities dismissed the ransom demand Attack.Ransom and decided to rebuild the affected systems . For two days , flight status information was displayed on whiteboards and there was an increase in announcements over the speakers . Similarly , in the last few months there have been several cyberattacks targeting hospitals , city administration and sporting events . The servers of the US-based PGA were reportedly hit by ransomware Attack.Ransom attacks right before the PGA Championship in the first week of August . A new ransomware called Everlasting Blue Blackmail Virus , which targets Windows PCs using spam and phishing campaigns Attack.Phishing , flashes former US President Barrack Obama ’ s image with the ransom message . Once the ransomware gains entry into the system , its looks for all .exe ( executable ) files and encrypts them , preventing users from running apps until the ransom is paid Attack.Ransom . Hot on the heels of the cyberattack Attack.Ransom on the town of Valdez in Alaska , Canadian town Midland in Ontario was hit by a ransomware attack Attack.Ransom in the first week of September . Hackers broke into the city database involving fire , water , and waste management and blocked access , demanding ransom Attack.Ransom . A major concern for cybersecurity experts is the fileless attacks , which are hard to detect . These attacks do not install a malicious software to infiltrate a victim ’ s computer , which makes it difficult for anti-virus solutions to detect them . According to Ponemon Institute , 35 % of all cyberattacks in 2018 were fileless , while security solution provider Carbon Black claims that fileless attacks accounted for 50 % of all successful data breaches Attack.Databreach targeting financial businesses . Fileless attacks target legitimate Windows tools such as PowerShell ( a scripting language which can provide hackers unrestricted access to Windows API ) and Windows Management Instrumentation ( used by admins ) . By latching on to these tools , hackers gain control over the PC and eventually the organization ’ s database . In another recent development , researchers at F-Secure have come across a new vulnerability affecting PCs . Dubbed as cold boot , the attack can be carried off using a special programme through a USB drive connected to a PC . Using the programme , the hacker can disable the memory overwriting by rebooting the system , without a proper shutdown . The attack can be used to break into company system which might have access to the company network .