article_snippet.sent: Tewksbury Police Department came under  attack by criminals who infected Tewksbury Police Department network with a form of Internet malware in December before demanding money to decrypt the files.
article_snippet.sent: The program called CryptoLocker infects  through an e-mail and then scrambles the data on the computer.
article_snippet.sent: The program called CryptoLocker infects  through an e-mail caused police systems to be down between four and five days, according to Tewksbury Town Crier.
article_snippet.sent: Tewksbury Police Department (above) came under attack by hackers which encrypted their computers' files using a malware program called CryptoLocker.
article_snippet.sent: Police became aware of the malware infection the following day.
article_snippet.sent: Computers were hit with a more recent form of CryptoLocker that authorities did not have the key to, said Police Chief Timothy Sheehan.
article_snippet.sent: It is believed that the Officer In Charge's computer  became infected and the virus traveled to the largest store of data on the network which held files including arrest logs, motor vehicle records, calls for service and records management, according to the Town Crier.
article_snippet.sent: CryptoLocker is malware that is often installed on computers at the same time.
article_snippet.sent: CryptoLocker locks your computer, encrypts files and demands a ransom for a ransom to be unlocked.
article_snippet.sent: Computers can become corrupted through phishing emails that include malicious attachments and pop-up ads.
article_snippet.sent: [The data] stays interior, but the malware infection encrypts The data] and prevents The data] from being readable,' Sheehan told the Town Crier.
highlights_snippet.sent: Tewksbury Police Department was attacked by criminals who infected their network with  malware program called CryptoLocker .
  
highlights_snippet.sent: CryptoLocker restricts access to infected computers and demands payment to recover files .
  