Untraceable

Untraceable is a 2008 American thriller film starring Diane Lane, Colin Hanks, Billy Burke, and Joseph Cross. It was directed by Gregory Hoblit and distributed by Screen Gems.

Special Agent Jennifer Marsh Diane Lane is a widowed single parent living in a suburban Portland home with her daughter, Annie Haskins Perla HaneyJardine, and her mother, Stella Marsh Mary Beth Hurt. At night, she works in the FBIs cybercrime division with Griffin Dowd Colin Hanks, fighting identity theft and similar crimes. One night, an anonymous tip leads them to a website called KillWithMe.com. The site features a streaming video of a cat being tortured and killed. The website cannot be shut down, as the creator knew that someone would try and built into it a failsafe every time the server is closed, a mirror server immediately replaces it.After the cats death, KillWithMe.coms webmaster graduates to human victims and makes their deaths correlate directly with the number of hits the site receives. At a press conference, the public is urged to avoid the website, but as Jennifer feared this only increases the sites popularity. The videos are recorded in the killers basement and his victims include a helicopter pilot bled to death by injections of anticoagulant, a newscaster burnt to death by heat lamps while cemented into the floor, and Griffin Dowd killed by slowly increasing the concentration of sulfuric acid solution in which he is submerged up to his neck. ........

Source: Wikipedia