At the heart of all Trend Micro products lies the scan engine, which was originally developed in response to early file-based endpoint viruses. The scan engine today is exceptionally sophisticated and capable of detecting different types of Viruses and Malware. The scan engine also detects controlled viruses that are developed and used for research.
Rather than scanning every byte of every file, the engine and pattern file work together to identify the following:
Tell-tale characteristics of the virus code
The precise location within a file where the virus resides
OfficeScan removes viruses/malware upon detection and restores the integrity of the file.