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Retain enough information to judge an intelligence item, use it safely, share it lawfully, and explain it later. For each indicator or intelligence record, preserve its source, collection date or time, permitted use and sharing rules, expected validity period, and the context that gives it meaning: associated actors and aliases, tactics, techniques and procedures (TTPs), motives, targets, systems, and relevant vulnerability or configuration identifiers.
Handle material collected during an incident investigation differently. If an indicator, log, image, message, or other artifact may become evidence, preserve the original and document its handling with chain-of-custody and applicable legal, regulatory, contractual, and records-management requirements. There is no universal retention period for every organization or record type; your documented schedule should determine when information is retained, archived, or destroyed.
Start with the distinction: intelligence record or incident evidence?
NIST defines threat intelligence as threat information that has been aggregated, transformed, analyzed, interpreted, or enriched to provide context for decision-making. The resulting record may be an indicator, an actor profile, a detection rule, a warning, or an incident-analysis finding. Its value is usually operational or historical: it helps defenders decide what to investigate, block, monitor, or share.
Incident evidence has a different purpose. It may need to support an investigation, disciplinary action, litigation, insurance claim, regulatory response, or criminal proceeding. Once information is acquired for that purpose, preserving the original data, proving its integrity, and documenting every transfer matter as much as the analytical interpretation. NIST states that evidence from incident investigations should be collected and preserved using data-preservation best practices, chain-of-custody requirements, and applicable laws. NIST SP 800-150 gives that guidance in its discussion of threat-information retention.
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Make the classification at intake, and allow it to change. An IP address received from a sharing community may begin as routine intelligence. If it is later tied to a compromised host and collected during an investigation, the related records should be managed as evidence. Keep the intelligence context, but place the investigative artifacts under the organization’s evidence-preservation process.
The minimum record for every indicator
Use an indicator knowledgebase or equivalent record that can stand alone months after collection. NIST SP 800-150 identifies the following fields when known:
| Record element | What to capture | Why it matters |
|---|---|---|
| Indicator source | The organization, system, partner, sensor, analyst, report, or feed that supplied it; include an internal reference to the original material. | Lets a reviewer assess reliability, contact the source, and trace the item back to its origin. |
| Use and sharing rules | Mark handling instructions, licensing terms, classification, traffic-light or equivalent restrictions, and any audience limits that apply. | Prevents an analyst from redistributing an item outside the permission granted by its source. |
| Collection date or time | Record when the indicator was observed or received, with time zone and precision appropriate to the source. | Supports timeline reconstruction and helps distinguish a current observation from an old one. |
| Expected validity | Record how long the indicator is expected to remain valid, or the review or expiration date supplied by the source. | Stops stale indicators from driving unnecessary blocking or investigations. |
| Targeted organizations or sectors | Identify known victim organizations, industries, regions, or mission areas. | Allows defenders to judge relevance to their own environment and prioritize review. |
| Related identifiers | Where applicable, link the item to a CVE, CPE, CWE, CCE, platform, vulnerability, weakness, or configuration identifier. | Connects the indicator to affected technologies and remediation work. |
| Actor or group | Record the associated actor or group and every known alias, while preserving uncertainty when attribution is provisional. | Supports correlation across reports without treating an unconfirmed attribution as fact. |
| TTPs and motive | Capture common tactics, techniques, procedures, objectives, and stated or assessed intent. | Behavioral context helps detection teams find related activity even when a single indicator changes. |
| Targets | Describe the individuals or categories of individuals targeted and the systems, services, or data targeted. | Shows who or what is at risk and guides defensive coverage. |
Do not silently fill unknown fields. Use an explicit value such as “unknown,” “not reported,” or “assessment pending,” and record who made an assessment and when. A blank field cannot tell a later user whether the information was overlooked or genuinely unavailable.
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Keep the original and the analytical derivative
Store the source artifact in its original form when policy permits: the received file, message, event, or report. Create a separate normalized record for searchable fields and enrichment. Link the two with a stable identifier. This preserves what was actually received while allowing analysts to correct a parsing error or add context without rewriting history.
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Record transformations and enrichment
Document normalization, deduplication, reputation lookups, sandbox results, reverse-DNS observations, or analyst judgments that change how an item is interpreted. Include the tool or method, execution time, and responsible person or service. If a confidence score or attribution changes, retain the prior value and the reason for the change rather than overwriting it.
Protect integrity
Access controls should separate routine editing from approval, deletion, and export. Use tamper-evident audit logs or equivalent controls for changes to high-value records. For evidence, calculate and retain cryptographic hashes where required by your forensic procedure, but do not treat a hash alone as a substitute for documented collection and custody steps.
When an intelligence item becomes evidence
Apply an evidence hold when an incident lead, legal counsel, records officer, or other authorized role determines that material may be needed for an investigation or proceeding. The hold should identify the systems and date range covered, the responsible custodian, and the normal deletion processes that must be suspended.
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- Collect using an approved method. Preserve the original where feasible and avoid altering timestamps, metadata, or content during acquisition.
- Document custody. Log each person or system that receives, accesses, copies, transfers, or returns the item, including date, time, purpose, and authorization.
- Store securely. Restrict access to authorized investigators, protect the item from alteration, and keep a separate working copy for analysis when practical.
- Maintain associated records. Keep collection notes, tool versions, commands or settings, hashes when used, photographs or screenshots, and explanations of any conversion.
- Release or dispose under authority. End the hold only after the authorized owner confirms that legal, regulatory, contractual, and investigative needs are satisfied.
The exact forms, signatures, hashing requirements, and custody intervals depend on jurisdiction and organizational policy. NIST does not prescribe one evidence schema or one retention duration for every organization.
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Set retention, archive, and destruction rules
Create a schedule by record class rather than assigning one number to all threat data. At minimum, distinguish routine intelligence, intelligence with historical value, operational logs, and incident evidence. For each class, document the trigger that starts the retention clock, the review point, the archive location, permitted access, legal holds, and approved destruction method.
Older threat information can remain useful even after its indicators expire. Historical records may reveal how an actor or attack type persisted and evolved, support trend analysis, or explain why a past decision was made. Balance that value against storage and handling cost, privacy exposure, contractual restrictions, and financial, legal, regulatory, or records-management limits. If a rule sets a fixed maximum, follow it even when analysts would prefer to keep the material longer; seek an authorized exception rather than retaining it informally.
At the review point, classify the record as still operational, historical, evidence-held, or eligible for disposition. Archive records that remain valuable but are no longer needed for rapid operations, preserving their provenance and access restrictions. Destroy eligible material according to policy and record what was destroyed, when, by whom, and under which rule.
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Logs often provide the corroboration that turns an indicator into an incident finding. NIST SP 800-92 Rev. 1 describes log management as generating, transmitting, storing, accessing, and disposing of log data, and connects it with incident investigation and storing records for the required period. The publication record identifies Rev. 1 as a draft dated October 11, 2023, so verify its status before treating it as final guidance: NIST SP 800-92 Rev. 1 draft.
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Define which logs are authoritative for each use case, synchronize clocks where possible, and retain enough metadata to interpret an event: host or service identity, account, time zone, event type, source address, destination, and collection path. Record gaps, parser changes, clock corrections, and outages. A log copy used in an investigation should inherit the evidence controls described above; ordinary operational retention does not automatically establish forensic admissibility.
A practical workflow for operationalizing retention
- Classify at intake. Mark the item as routine intelligence, a potential investigative artifact, or evidence under hold.
- Capture the core fields. Enter source, handling rules, collection time, validity, targets, related identifiers, actor information, TTPs, and motive when known.
- Link context. Attach the original report or message, related indicators, detections, vulnerabilities, incidents, and analyst assessments.
- Set review dates. Use the source’s validity period when supplied; otherwise assign an internal review date based on operational risk and policy.
- Apply access and sharing controls. Enforce the source’s restrictions before exporting to a ticket, sensor, partner, or government recipient.
- Escalate to evidence handling. Place a hold and begin chain-of-custody documentation as soon as an investigation requires preservation.
- Review and disposition. At the scheduled point, renew operational use, archive for historical value, or destroy under the approved rule.
How to decide what to keep
Use the following comparison when a record owner sets or reviews a disposition decision. It is a decision aid, not a standardized scoring system.
| Question | If the answer is yes | If the answer is no or unknown |
|---|---|---|
| Could this material be needed as incident evidence? | Preserve the original, document custody, and apply the evidence hold process. | Manage it under the intelligence retention schedule while monitoring for a change in status. |
| Can another analyst verify where it came from and when? | Retain the provenance fields and source artifact. | Seek clarification or label the provenance limitation; lower confidence and sharing scope as appropriate. |
| Are use or sharing restrictions documented? | Enforce them in access and export controls. | Do not assume unrestricted use; obtain permission or keep distribution internal. |
| Does it remain operationally relevant? | Keep it available to detection, response, and intelligence workflows and set the next review. | Consider archive or disposition after checking historical and legal value. |
| Does it explain actor or campaign evolution? | Archive with searchable context and preserved relationships. | Apply the normal schedule, subject to holds and other obligations. |
| Do legal, contractual, regulatory, or records rules set a limit? | Follow the stricter applicable requirement and document the basis. | Use the organization’s approved schedule and cost controls. |
Common failure modes and fixes
Keeping only the indicator value
An isolated hash, domain, or address cannot show its source, age, permitted use, or intended target. Require the core metadata before an item enters production feeds, or quarantine incomplete records for analyst review.
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Overwriting history
Replacing an old expiration date, confidence rating, or attribution hides how a decision was made. Use versioned updates with timestamps, authors, and change reasons.
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Mixing evidence with a working database
Routine edits, enrichment jobs, and automatic expiration can alter material that investigators need preserved. Copy or export the relevant artifacts into the controlled evidence process and suspend destructive jobs under a hold.
Assuming an expired indicator has no value
An expired address may still connect campaigns, explain a detection, or document an actor’s evolution. Evaluate historical value before destruction.
Quoting a universal retention period
Neither NIST SP 800-150 nor the cited related guidance establishes one duration for every organization. Set periods through your legal, regulatory, contractual, privacy, and records-management review.
Current reference points and scope
NIST SP 800-150, Guide to Cyber Threat Information Sharing, was finalized October 4, 2016 and provides the indicator fields, evidence-preservation distinction, and retention considerations described above. NIST’s threat intelligence glossary entry defines the term used in this article.
For incident-response practice, use NIST SP 800-61 Rev. 3, the final revision published April 3, 2025, which supersedes Rev. 2. For federal sharing, CISA’s final procedures, version 2.0 (October 2021), describe how cyber threat indicators and defensive measures are received, handled, and disseminated by the federal government. That CISA process is federal-context guidance, not a universal private-sector retention rule.
“Evidence acquired during any incident investigations, for instance, should be collected and preserved using best practices for data preservation following chain of custody requirements and other laws pertaining to the submission of evidence.” — NIST SP 800-150
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