The Anti-virus Times

1. A company discovered that one of its employees is reasonably well versed in web design and programming, and asked him to develop a corporate website. A few months later the employee was reprimanded for regularly shirking his duties, and the company's president told him that management was going to fire him. That same day, the resentful employee remotely logged on to the corporate network, erased some data, and changed the text and pictures on the website. When police arrested the culprit, he explained that he got angry because the employer fired him.
2. A system administrator, who worked for a prosperous company in the military industry, got angry with his bosses. He believed that they undervalued him while he was working hard to set up and maintain the entire corporate network. So the employee moved the industry workflow software used by the company to one server. After that he coerced his colleague into giving him the only software backup. After management fired the system administrator for his threatening and inappropriate attitude toward his colleagues, the logic bomb exploded. The angry employee erased all the data on the server, causing the company damages in the amount of $10 million, which led to the dismissal of 80 employees.
3. An application developer was downsized out of his job at an IT company. In retaliation, the former employee attacked the firm's network just before the Christmas holidays. Three weeks later, after his dismissal, he remotely logged on to the corporate network using his former colleague's account, modified data on the company's web server, changed the text and published pornographic images on the company’s website. After that, the disgruntled developer sent emails to all the company's clients proposing that they open the corporate website and verify for themselves that it had been compromised. Each message contained a client login and password to access the site. An investigation was started, but it failed to identity the offender. Six weeks later the perpetrator once again remotely accessed the network and launched a script that altered all the passwords on the network and modified 4,000 entries in the price database. This time he was identified and arrested. He was sentenced to five months in prison and two years’ probation. The punishment also included a $48,600 fine, which he had to pay to his former employer.
4. A municipal servant wasn't appointed a financial officer. Another employee took the position. To get revenge, the infuriated bureaucrat deleted all the files on his computer and the computers of his colleagues the day before the new financial officer was due to assume the position. The investigation that followed proved that the employee was guilty, but because many of the files were restored, the local government agreed to refrain from starting criminal proceedings and allowed the perpetrator to quit.

http://citforum.ru/security/articles/sabotage