Ukrainian site High Tech informed about a modified version of TeamViewer with a virus inside:
"ESET company has informed about new virus alert - Win32/Sheldor.NAD, that is a modified version of a popular remote desktop control solution - TeamViewer.
One of the legal TeamViewer's modules that is used in a process of network interaction with software's servers was modified. The modification sent authentication data of actual software's session to violator's server, that enables an access to active session on infected PC at any required time.
Thus, violators had got not only an access to confidential user's data but an ability to perform different actions on a remote PC as well, e.g. remote banking transactions, etc.
Due to the fact that most components of TeamViewer have legal digital signature, excluding only one module, many antivirus systems did not detect it as alert. ESET analysts notice, that a modified version of the software was installed by a Trojan installer in order to create all necessary register keys for Win32/Sheldor.NAD operation. It had copied TeamViewer's components into %WINDIR% system folder and added into autorun."