You investigate a suspected malware incident and confirm that it was a false alarm.

After an investigation confirms a malware alert is a false positive, the primary goal is to prevent the same benign file from triggering future alerts, a process known as tuning. Adding the file's unique cryptographic hash (e.g., SHA-256) to a filter, exclusion list, or allow list is the most precise and secure method. This instructs the security system to recognize and trust this specific file in the future, effectively suppressing recurrent false alarms without broadly weakening security policies. This action directly resolves the issue without disrupting the availability of a legitimate file.

B. Quarantining is an action for confirmed malicious files, not false positives. The investigation is already complete, making a hash lookup a redundant, retrospective step.

C. Exporting a packet capture is a data collection step for network analysis during an investigation. It does not prevent future alerts for a specific file.

1. Netspoke Corporation. (2023). Netspoke NSK101 Security Operations Guide. DOC-NSK101-SOG-v3.1

Section 4.5.2

"False Positive Management

" p. 88. "Upon confirming a false positive

the recommended procedure is to add the file's SHA-256 hash to the global allow list via the file filter policy to prevent re-occurrence."

2. Saltzer

J. H.

& Kaashoek

M. F. (2015). Principles of Computer System Design: An Introduction. MIT OpenCourseWare

6.033 Computer System Engineering

Spring 2015

Chapter 9

"Security and Protection

" p. 312. "Systems must provide mechanisms for administrators to create exceptions for known-good software

often by using cryptographic hashes as unique identifiers to bypass scanning."

3. Sommer

R.

& Paxson

V. (2010). Outside the Closed World: On Using Machine Learning for Network Intrusion Detection. Proceedings of the 2010 IEEE Symposium on Security and Privacy

p. 308. https://doi.org/10.1109/SP.2010.25. The paper discusses the critical need for tuning detection systems

where "ground truth" labeling of false positives (e.g.

whitelisting a file hash) is essential for operational viability.