TeamViewer is proprietary computer software for remote control, desktop sharing, online gaming, web conferencing, and file transfer between computers with a partner ID and password. Meetings use a special ID, which begins with "m-" and randomized code after the character.
Because of its main capability of getting a direct and complete access to a remote computer, it is to be categorized as a Riskware program. Below are example of successful misuses of the software for malicious purposes.
TeamViewer and similar services have been used to commit technical support scams via telephone calls. During these scams, people are called, either at random or from a list, by scammers that claim to represent a computer support service, such as Microsoft, which has identified the victim's computer as being infected by malware. The scammer then asks the victim to give them access to their computer by installing a remote control service, which can allow the attacker to infect the computer with malware or to delete or copy personal files. A Wired journalist investigating the scams was asked by a scammer to install TeamViewer.
In March 2016, it was reported that a ransomware program named "Surprise" was exploiting TeamViewer as an infection channel, among other distribution methods.
In June 2016, hundreds of TeamViewer users reported having their computers accessed by an unauthorized address in China and bank accounts misappropriated. TeamViewer has denied having been hacked directly and claimed their service went offline purportedly due to a denial-of-service attack.
In March 2017, UK [http:// ISP TalkTalk Group] blocked the TeamViewer service to protect its customers from online scams. It remains blocked as of May 2018.