Method and computer program product for signature testing used in anti-malware processing. Silent signatures, after being tested, are not updated into a white list and are sent directly to users instead. If the silent signature coincides with malware signature, a user is not informed. A checksum (e.g., hash value) of a suspected file is sent to a server, where statistics are kept and analyzed. Based on collected false positive statistics of the silent-signature, the silent-signature is either valid or invalid. Use of the silent signatures provides for effective signature testing and reduces response time to new malware-related threats. The silent signature method is used for turning off a signature upon first false positive occurrence. Use of silent signatures allows improving heuristic algorithms for detection of unknown malware.