Keep your software up to date. This can prevent hackers exploiting security issues found in applications.
Use a firewall. Firewalls protect one computer network from another by only allowing certain communications. Most computers with Windows or Mac OS come with a software firewall installed. Make sure it is on.
ransomware - a type of malware that makes data or systems unusable until the victim makes a payment
keyloggers, which attempt to steal passwords or credit card information
Malware can get into a computer or device via:
contaminated email attachments
corrupted memory sticks, floppy disks, DVDs, CDs, cameras or networks
Ways to protect against malware
Use antivirus software and keep it up to date.
Only open email attachments from trusted sources. Check with them if you are unsure about something before opening it.
Back up your data regularly and keep copies in a safe place.
Use a firewall.
Don’t connect any unknown devices to your computer.
Denial of Service (DoS) attack
A DoS attack makes a website or other internet-based service unavailable. The attacker sends a huge number of requests to the site or service at once, causing it to crash. Attacks from more than one computer are 'distributed denial of service (DDoS)'.
Most victims of DoS attacks are high-profile organisations. This includes multinationals, government agencies, banks and other financial institutions.
DoS attacks in themselves do not cause damage. When the attack stops, things generally return to normal. Instead, they can cause loss of business or reputational damage.
Possible signs of a DoS attack
If you are running a website or internet service, typical signs of a DoS attack are:
your website becomes very slow or unavailable
you are receiving a dramatic increase in spam emails
What to do if you experience a DoS attack
If you believe an active attack is occurring on your system or service, you should:
contact your internet service provider, as well as your web host, to make them aware