A signed installer is an executable package that carries a digital signature from a code-signing certificate. The signature helps operating systems and security tools verify who published the file and whether it was altered after signing. It does not prove the software is safe, necessary, or used for legitimate purposes.
That distinction matters in cyber security because attackers can abuse trusted signatures to make malicious or dual-use software look normal. A phishing email may deliver a signed remote administration tool, and a user may run it because the file appears reputable. Defenders should not rely on signature alone; they should also check the download source, the requesting user, the parent process, network destinations, and whether the installer is approved in allowlists. In practice, signed installers are a trust signal, not a guarantee of benign intent.