n horses are computer programs that appear to have useful functions but actually contain malicious code. A video sent from Facebook can have a Trojan horse embedded within it. Some firewalls can also detect anomalies that are indicative of an attack, including packets that are too short. Firewalls can be in the form of software located at the ISP, the cloud, or at enterprise locations. Protection from Internal Sabotage The human factor is the weakest link in securing networks. Current technology is unable to prevent humans from acting in opposition to policy. Many human errors that result in security lapses are inadvertent. However, there are malicious employees who purposely steal or copy intellectual property or insert malware into computer files. An important safeguard against malicious employees is careful screening and reference checks before hiring staff. An additional way to guard corporate data is a need to know policy that allows employees to access only applications that they need for their job. Other strategies include setting up rules such as not allowing the use of thumb drives in USB ports on computers, and building in alerts if a thumb drive is inserted into a staff person's computer. In addition, security staff can revoke all passwords and access to files as soon as a person's employment is terminated. Some organizations have security personnel walk fired staff or staff that quit their job out the door to ensure that they don't take company computers and/or files with them when they leave. Recovery from Ransomware and Other Hacks Recovery from attacks containing malware requires organizations to rid their network of corrupted files and computers that have viruses and other malware that www.TechnicalPDF.com enables hackers to spy on computer files. If duplicate files are stored offsite, the damaged disks containing viruses can be wiped clean or removed and replaced with the back-up files. Ransomware attacks occur when a user clicks on a phishing link in their email that sends her to a malicious web