An organization's intrusion detection system (IDS) flags an executable file behaving suspiciously, trying to access system files and sending data to an external IP. However, the file's signature is not present in the malware database. This situation might be an instance of:

  • APT (Advanced Persistent Threat)
  • False Positive
  • Polymorphic Malware
  • Zero-Day Exploit
In this situation, where the behavior is suspicious, but the file's signature is not recognized, it could be indicative of a zero-day exploit, which is an attack that exploits a vulnerability unknown to the software vendor.
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