Investigating Suspected Information Security Violations
The Security Violation Investigation Procedure defines a structured process for investigating suspected violations of information-security requirements.
The objective is to establish facts, protect evidence, assess security risk, determine the nature and impact of the violation, and provide reliable information for security, management, HR, compliance, or legal decisions.
An investigation should be objective and evidence-based. A suspected violation should not be treated as a confirmed violation until the relevant facts have been appropriately assessed.
Report → Preserve → Contain → Plan → Investigate → Analyze → Validate → Conclude → Remediate → Close
1. Purpose
This procedure establishes how the organization should:
- Receive suspected security-violation reports
- Perform an initial assessment
- Protect relevant evidence
- Contain immediate security risks
- Define investigation scope
- Assign investigation responsibility
- Collect and analyze evidence
- Interview relevant personnel
- Determine what happened
- Assess intent and contributing factors
- Determine impact and risk
- Document findings
- Recommend corrective actions
- Support HR, management, compliance, or legal decisions
- Verify closure
2. Scope
This procedure applies to suspected violations involving:
☐ Employees
☐ Contractors
☐ Consultants
☐ Interns
☐ Temporary personnel
☐ Privileged users
☐ Remote workers
☐ Third-party personnel where contractually applicable
It may apply to violations involving:
- Organizational information
- Customer information
- Personal data
- Confidential information
- Restricted information
- Applications
- Cloud services
- Production systems
- Source code
- Databases
- Endpoints
- Identity systems
- Security systems
3. Investigation Principles
Investigations should follow these principles.
Objectivity
Investigators should assess evidence rather than assume guilt.
Independence
Where practical, the investigator should not have a conflict of interest with the matter being investigated.
Confidentiality
Investigation information should be restricted to authorized personnel.
Evidence Integrity
Evidence should be protected against unauthorized modification or destruction.
Proportionality
The depth of investigation should reflect the seriousness and risk of the suspected violation.
Least Necessary Access
Investigators should access only information necessary for the investigation.
Legal Compliance
Evidence collection and investigation activities should comply with applicable law, employment requirements, privacy requirements, contracts, and organizational policies.
Non-Retaliation
Good-faith reporting should not itself be treated as misconduct.
4. Security Violation vs Security Incident
A security violation may also constitute a security incident, but the two concepts are not identical.
Example
An employee accidentally sends confidential information to the wrong recipient.
This may be:
- A security event
- A potential security incident
- A privacy incident
- A policy violation
The organization should assess the circumstances before determining whether disciplinary action is appropriate.
Important Principle
Investigate the facts first. Determine the appropriate classification and response based on evidence.
5. Types of Security Violations
Potential violations may include:
Unauthorized Access
- Accessing systems without authorization
- Attempting to bypass access controls
- Using another person’s credentials
- Accessing information outside assigned responsibilities
Information Misuse
- Unauthorized disclosure
- Unauthorized copying
- Improper sharing
- Improper storage
- Unauthorized transfer
- Improper disposal
Credential Misuse
- Sharing passwords
- Sharing MFA codes
- Using another person’s account
- Misusing privileged credentials
- Circumventing authentication
Security-Control Bypass
- Disabling security controls
- Circumventing monitoring
- Bypassing approved processes
- Disabling endpoint protection without authorization
Technology Misuse
- Unauthorized software
- Unauthorized cloud services
- Unauthorized devices
- Unapproved AI tools
- Unauthorized data-transfer mechanisms
Evidence or Monitoring Tampering
- Deleting logs
- Altering evidence
- Disabling monitoring
- Attempting to conceal activity
Repeated Non-Compliance
- Repeated failure to follow security procedures
- Repeated access violations
- Repeated security policy violations
6. Sources of Investigation
A suspected violation may originate from:
☐ Employee report
☐ Manager
☐ Security team
☐ IT team
☐ Security monitoring
☐ SIEM
☐ IAM logs
☐ Cloud monitoring
☐ Internal audit
☐ Security assessment
☐ Vulnerability assessment
☐ Phishing simulation
☐ Customer report
☐ Supplier report
☐ Data-loss detection
☐ Access review
☐ Automated alert
☐ Incident investigation
7. Investigation Lifecycle
The investigation should generally follow:
1. Report
Receive and record the concern.
2. Preserve
Protect potentially relevant evidence.
3. Contain
Manage immediate security risks.
4. Plan
Define scope, objectives, roles, and evidence sources.
5. Investigate
Collect and analyze evidence.
6. Validate
Confirm important findings using reliable evidence.
7. Conclude
Document facts, impact, and conclusions.
8. Remediate
Address security weaknesses and root causes.
9. Close
Verify actions and formally close the investigation.
8. Step 1 — Receive the Report
Record:
| Field | Details |
|---|---|
| Investigation ID | |
| Date Reported | |
| Time Reported | |
| Reporter | |
| Reporting Channel | |
| Suspected Person | |
| Department | |
| Description | |
| Systems Involved | |
| Information Involved | |
| Initial Severity | |
| Investigator |
The initial report should distinguish between known facts and assumptions.
9. Step 2 — Initial Assessment
Determine:
☐ What happened?
☐ When did it happen?
☐ Who may be involved?
☐ What system is involved?
☐ What information is involved?
☐ Is the activity ongoing?
☐ Is unauthorized access still possible?
☐ Is customer information involved?
☐ Is personal data involved?
☐ Is privileged access involved?
☐ Is there an immediate security risk?
☐ Is there potential regulatory impact?
☐ Is there potential contractual impact?
10. Step 3 — Immediate Containment
Where necessary, implement temporary security measures.
Possible actions include:
☐ Disable account
☐ Suspend privileged access
☐ Revoke sessions
☐ Reset credentials
☐ Revoke tokens
☐ Isolate device
☐ Restrict network access
☐ Suspend cloud access
☐ Restrict database access
☐ Protect source-code access
☐ Preserve logs
Containment should be based on risk and authorized procedures.
Containment protects the organization while the investigation establishes the facts.
11. Step 4 — Preserve Evidence
Before collecting or changing potentially relevant evidence:
☐ Identify evidence sources
☐ Preserve relevant logs
☐ Preserve authentication records
☐ Preserve access records
☐ Preserve relevant communications
☐ Preserve device information where appropriate
☐ Preserve cloud activity
☐ Preserve database activity
☐ Preserve source-code activity
☐ Preserve security alerts
☐ Restrict evidence access
☐ Record evidence handling
☐ Establish chain of custody where appropriate
Evidence preservation should follow the organization’s approved evidence-preservation and investigation procedures.
12. Evidence Sources
Depending on the case, evidence may include:
Identity and Access
- Login records
- MFA events
- IAM activity
- Privileged-access records
- Access approvals
- Account changes
Cloud
- AWS CloudTrail
- Cloud configuration changes
- Security alerts
- IAM activity
- Network activity
- Storage activity
Endpoint
- Endpoint security alerts
- Device logs
- File activity
- Malware detections
- Configuration changes
Application
- Application logs
- API activity
- Administrative activity
- User activity
Network
- Firewall logs
- VPN records
- Network monitoring
- DNS activity
Business Records
- Emails
- Tickets
- Change requests
- Access requests
- Approvals
- Relevant communications
Only evidence that is necessary and lawfully accessible should be collected.
13. Evidence Register
| Evidence ID | Evidence Type | Source | Date/Time | Collector | Location | Integrity | Status |
|---|---|---|---|---|---|---|---|
Each evidence item should have a unique identifier where appropriate.
14. Investigation Scope
Define:
Objective
Systems
Information
People
Time Period
Locations
Relevant Policies
Investigation Questions
- What happened?
- Who performed the activity?
- When did it occur?
- What systems were accessed?
- What information was accessed?
- Was the access authorized?
- Was information copied, changed, disclosed, or deleted?
- Was the activity accidental or intentional?
- What security controls failed?
- What corrective action is required?
15. Investigation Team
Assign appropriate roles.
| Role | Responsibility |
|---|---|
| Investigation Lead | Coordinates investigation |
| Security | Security analysis |
| IT | Technical evidence |
| System Owner | System context |
| HR | Personnel process |
| Legal | Legal assessment |
| Compliance | Regulatory requirements |
| Management | Business decisions |
| Privacy | Personal-data assessment |
Not every investigation requires every function.
16. Investigator Independence
Where practical:
☐ Investigator has no conflict of interest
☐ Investigator is sufficiently independent
☐ Investigator has appropriate competence
☐ Investigation responsibilities are documented
☐ Conflicts are disclosed
For sensitive or high-risk cases, an independent internal or external investigator may be appropriate.
17. Investigation Plan
Before detailed investigation, document:
☐ Objective
☐ Scope
☐ Investigation team
☐ Evidence sources
☐ Time period
☐ Systems
☐ Information involved
☐ Interview requirements
☐ Security controls
☐ Legal/privacy considerations
☐ Reporting requirements
☐ Expected deliverables
18. Evidence Collection
For each evidence item:
- Identify the source.
- Record the collection date and time.
- Record the person collecting it.
- Protect the original where appropriate.
- Use a controlled copy for analysis where practical.
- Record relevant metadata.
- Protect the evidence from unauthorized access.
Investigators should avoid altering original evidence unnecessarily.
19. Timeline Reconstruction
Develop a timeline of relevant activity.
| Date/Time | Event | Source | Person/System | Significance |
|---|---|---|---|---|
Timeline analysis can help identify:
- Initial activity
- Authentication
- Privilege changes
- Data access
- Data transfer
- Configuration changes
- Detection
- Containment
- Subsequent activity
20. Access Analysis
Determine:
☐ Was the user authorized?
☐ What permissions existed?
☐ What permissions were actually used?
☐ Was privileged access involved?
☐ Was access outside normal responsibilities?
☐ Were credentials shared?
☐ Was MFA used?
☐ Were unusual locations/devices involved?
☐ Were sessions active elsewhere?
☐ Were access controls bypassed?
21. Information Analysis
Determine:
☐ What information was accessed?
☐ Classification
☐ Owner
☐ Quantity
☐ Customer information
☐ Personal data
☐ Confidential information
☐ Restricted information
☐ Source code
☐ Security information
☐ Financial information
☐ Whether information was copied
☐ Whether information was modified
☐ Whether information was disclosed
☐ Whether information was deleted
22. System and Technical Analysis
Where relevant, assess:
☐ Authentication
☐ Authorization
☐ IAM
☐ Privileged access
☐ Endpoint
☐ Network
☐ Cloud
☐ Application
☐ Database
☐ Source code
☐ Logging
☐ Monitoring
☐ Security controls
☐ Configuration
☐ Vulnerabilities
23. Interview Process
Interviews should be conducted by authorized personnel.
Interview Preparation
☐ Define objective
☐ Review evidence
☐ Prepare questions
☐ Identify participants
☐ Consider confidentiality
☐ Consider applicable HR/legal requirements
Interview Topics
- What happened?
- What was the purpose?
- What actions were taken?
- What access was used?
- What information was involved?
- Who authorized the activity?
- Was the person aware of the requirement?
- Was there a technical or process problem?
- Was anyone else involved?
- Is there additional evidence?
Interview notes should distinguish statements from independently verified facts.
24. Intent Assessment
The investigation should consider whether the activity was:
Accidental
No reasonable intention to violate the requirement.
Negligent
Reasonable care was not exercised.
Reckless
There was significant disregard for known security requirements.
Intentional
The requirement was knowingly violated.
Unknown
Available evidence does not establish intent.
Intent should not be assumed without appropriate evidence.
25. Training and Awareness Review
Determine:
☐ Was the relevant policy available?
☐ Was the person trained?
☐ Was training completed?
☐ Was role-based training provided?
☐ Was the requirement clearly communicated?
☐ Was the policy recently changed?
☐ Was the person informed of the change?
☐ Was the person previously warned?
This information may help determine whether the issue resulted from awareness, process, technical controls, or deliberate behavior.
26. Root Cause Analysis
Determine why the violation occurred.
Possible causes:
☐ Lack of awareness
☐ Insufficient training
☐ Unclear policy
☐ Poor procedure
☐ Excessive access
☐ Technical control weakness
☐ Monitoring weakness
☐ Process weakness
☐ Management weakness
☐ Workload pressure
☐ Human error
☐ Negligence
☐ Deliberate misconduct
More than one cause may exist.
27. Impact Assessment
Assess:
Confidentiality
Was information disclosed or accessed improperly?
Integrity
Was information or a system modified improperly?
Availability
Was a system or service disrupted?
Privacy
Was personal data affected?
Customer
Were customers affected?
Financial
Was there financial impact?
Regulatory
Could regulatory requirements be triggered?
Contractual
Could customer or supplier contractual obligations be affected?
28. Risk Assessment
Determine:
Likelihood: Low / Medium / High
Impact: Low / Medium / High
Overall Risk: __________________
Consider:
- Information sensitivity
- System criticality
- Number of records
- Customer impact
- Privileged access
- Duration
- Scope
- Existing controls
- Likelihood of recurrence
29. Investigation Findings
Each finding should be supported by evidence.
| Finding ID | Requirement | Evidence | Condition | Risk | Conclusion |
|---|---|---|---|---|---|
A finding should distinguish between:
Requirement → Evidence → Observed Condition → Risk → Conclusion
30. Evidence Validation
Before finalizing a significant conclusion:
☐ Evidence source verified
☐ Evidence integrity considered
☐ Evidence independently corroborated where appropriate
☐ Alternative explanations considered
☐ Conflicting evidence assessed
☐ Interview statements compared with evidence
☐ Conclusion supported by evidence
The investigator should avoid conclusions that are stronger than the available evidence supports.
31. Investigation Conclusion
Possible conclusions:
☐ Violation confirmed
☐ Violation not confirmed
☐ Policy misunderstanding
☐ Accidental event
☐ Negligent violation
☐ Reckless behavior
☐ Intentional violation
☐ Security incident confirmed
☐ Privacy incident confirmed
☐ Further investigation required
☐ Insufficient evidence
32. Investigation Report
A formal investigation report may include:
- Investigation ID
- Executive summary
- Background
- Report source
- Objective
- Scope
- Investigation team
- Independence/conflict assessment
- Timeline
- Evidence reviewed
- Interviews
- Technical analysis
- Information affected
- Impact assessment
- Root cause
- Intent assessment
- Findings
- Risk assessment
- Immediate actions
- Corrective actions
- Recommendations
- Conclusion
- Limitations
- Approval
- Distribution
33. Investigation Report Template
Executive Summary
Background
Investigation Objective
Scope
Systems and Information
Timeline
Evidence Reviewed
Interviews
Findings
Root Cause
Intent Assessment
Security Impact
Privacy/Regulatory Impact
Risk Assessment
Immediate Actions
Corrective Actions
Recommendations
Conclusion
Limitations
34. HR and Disciplinary Referral
If the investigation identifies a potential personnel violation:
☐ Findings provided to authorized HR personnel
☐ Evidence appropriately preserved
☐ Security facts separated from employment conclusions
☐ HR process initiated
☐ Legal review performed where required
☐ Confidentiality maintained
Information Security should provide factual security findings rather than independently determining employment consequences outside its authority.
35. Legal and Privacy Referral
Refer to Legal/Privacy where appropriate for:
☐ Personal-data exposure
☐ Regulatory reporting
☐ Customer notification
☐ Contractual notification
☐ Potential criminal activity
☐ Litigation risk
☐ Employment-law issues
☐ Cross-border evidence
☐ Evidence preservation requirements
36. Corrective Action
After establishing the facts, identify actions required to prevent recurrence.
Possible actions:
☐ Additional training
☐ Access modification
☐ MFA improvement
☐ Privileged-access controls
☐ Monitoring improvement
☐ Logging improvement
☐ Policy update
☐ Procedure update
☐ Technical control
☐ Process improvement
☐ Management control
☐ Supplier action
☐ Risk treatment
37. Corrective Action Register
| Action ID | Finding | Root Cause | Action | Owner | Due Date | Evidence | Verification | Status |
|---|---|---|---|---|---|---|---|---|
38. Case Closure
The investigation may be closed when:
☐ Investigation objectives achieved
☐ Evidence reviewed
☐ Findings documented
☐ Impact assessed
☐ Risk assessed
☐ Required notifications completed
☐ Corrective actions assigned
☐ HR/legal actions completed where applicable
☐ Access decisions completed
☐ Residual risk accepted or treated
☐ Investigation report approved
☐ Records stored securely
☐ Lessons learned documented
39. Follow-Up
Following closure:
☐ Corrective actions monitored
☐ Access reviewed
☐ Additional training completed
☐ Technical controls implemented
☐ Effectiveness verified
☐ Recurrence monitored
☐ Residual risk reviewed
☐ Investigation lessons incorporated into security controls
Closure does not mean the risk has disappeared.
40. Lessons Learned
For significant investigations, document:
What worked?
What failed?
Why did it happen?
Could the violation have been prevented?
Which controls need improvement?
What training is required?
What process changes are required?
41. Confidentiality and Access
Investigation records may contain sensitive information.
Protect them through:
☐ Restricted access
☐ Role-based permissions
☐ Secure storage
☐ Encryption where appropriate
☐ Access logging where appropriate
☐ Retention controls
☐ Secure disposal
Investigation records should not be distributed broadly.
42. Investigation Records
Maintain appropriate evidence such as:
- Investigation report
- Investigation plan
- Evidence register
- Timeline
- Interview records
- Relevant logs
- Technical analysis
- Findings
- Risk assessment
- Corrective actions
- Approval records
- Closure evidence
Retention should follow applicable organizational, contractual, legal, privacy, and regulatory requirements.
43. Metrics and Management Reporting
Management may receive aggregated information such as:
| Metric | Result |
|---|---|
| Investigations opened | |
| Investigations closed | |
| Open investigations | |
| Average investigation duration | |
| Confirmed violations | |
| Unconfirmed violations | |
| Accidental events | |
| Negligent events | |
| Intentional violations | |
| Repeat violations | |
| Corrective actions | |
| Overdue actions |
Individual personnel information should not be unnecessarily included in management dashboards.
44. AWS SaaS Startup Example
Consider a SaaS startup operating:
- AWS production
- GitHub
- Production databases
- Customer data
- Microsoft 365
- Remote workforce
Scenario
A developer accesses a production database using another employee’s credentials.
Investigation
1. Preserve
Collect relevant:
- AWS CloudTrail records
- IAM activity
- Database logs
- Authentication records
- Source-code records where relevant
2. Contain
Suspend unauthorized access and protect affected accounts.
3. Establish Timeline
Determine:
Login → Authentication → Database Access → Queries → Data Access → Logout
4. Determine Authorization
Review:
- Assigned permissions
- Access approvals
- Role requirements
- Privileged-access records
5. Determine Impact
Establish whether customer data was:
- Viewed
- Copied
- Modified
- Exported
- Disclosed
6. Determine Cause
Assess whether the issue resulted from:
- Credential sharing
- Excessive permissions
- Process weakness
- Technical weakness
- Deliberate behavior
7. Conclusion
Document the facts and supporting evidence.
8. Corrective Action
Potential actions include:
- Eliminate shared credentials
- Enforce individual accounts
- Strengthen MFA
- Review database permissions
- Improve privileged-access monitoring
- Provide targeted training
Preserve → Contain → Investigate → Validate → Assess Risk → Correct → Verify
45. Startup-Friendly Investigation Model
For a small organization, a simple investigation team may consist of:
| Responsibility | Owner |
|---|---|
| Investigation lead | Security/IT |
| Technical evidence | IT/Security |
| System owner | Relevant technical owner |
| Employee process | HR |
| Legal assessment | Legal/advisor |
| Business decision | Management |
| Corrective action | Assigned owner |
High-risk investigations may require independent external expertise.
46. Common Mistakes
Avoid:
- Assuming the person is guilty before investigation.
- Failing to preserve evidence.
- Changing systems before evidence is preserved.
- Allowing unauthorized personnel to access evidence.
- Collecting unnecessary personal information.
- Ignoring privacy requirements.
- Treating every mistake as misconduct.
- Relying on a single log or statement.
- Ignoring alternative explanations.
- Confusing security containment with disciplinary action.
- Allowing the investigator to have an unmanaged conflict of interest.
- Failing to document investigation limitations.
- Closing a case without verifying corrective actions.
- Failing to address technical root causes.
47. Relationship With Other ISMS Documents
| Document | Relationship |
|---|---|
| Information Security Disciplinary Policy | Defines disciplinary principles |
| Disciplinary Process | Defines personnel disciplinary workflow |
| Incident Response Procedure | Handles security incidents |
| Incident Investigation Procedure | Supports incident investigation |
| Evidence Preservation Procedure | Protects evidence |
| Evidence Collection Procedure | Defines evidence collection |
| Chain-of-Custody Form | Records evidence handling |
| Security Incident Register | Records incidents |
| Security Findings Register | Records investigation findings |
| Corrective Action Tracker | Tracks remediation |
| Access Management Procedure | Controls access |
| Privileged Access Procedure | Controls privileged access |
| Employee Security Responsibilities | Defines personnel obligations |
| Security Awareness Policy | Defines awareness requirements |
48. ISO 27001 Connection
A Security Violation Investigation Procedure supports the organization’s ability to investigate security events, establish facts, manage risk, protect information, and improve security controls.
It can support areas relating to:
- Information-security incident management
- Access control
- Personnel security
- Information protection
- Logging and monitoring
- Evidence handling
- Corrective action
- Continual improvement
The Security Violation Investigation Procedure is not itself a universally prescribed ISO 27001 document. The organization should determine the appropriate investigation methodology, evidence requirements, roles, escalation criteria, and records based on its ISMS scope, risks, applicable controls, contractual obligations, and legal/regulatory requirements.
49. Final Investigation Checklist
☐ Investigation ID assigned
☐ Report received
☐ Initial assessment completed
☐ Immediate risk assessed
☐ Containment performed where required
☐ Evidence identified
☐ Evidence preserved
☐ Investigation scope defined
☐ Investigation team assigned
☐ Independence/conflict considered
☐ Investigation plan established
☐ Relevant logs collected
☐ Access reviewed
☐ Information affected identified
☐ Timeline established
☐ Interviews completed where appropriate
☐ Training records reviewed
☐ Root cause assessed
☐ Intent assessed
☐ Impact assessed
☐ Risk assessed
☐ Findings documented
☐ Evidence validated
☐ HR/Legal referral completed where required
☐ Corrective actions assigned
☐ Investigation report completed
☐ Management approval obtained where required
☐ Follow-up completed
☐ Corrective actions verified
☐ Records securely retained
☐ Lessons learned documented
☐ Case formally closed
50. Final Audit Trail
For every significant security-violation investigation, the organization should be able to demonstrate:
How was the suspected violation identified?
Who reported it?
What immediate risk existed?
What evidence was preserved?
Who conducted the investigation?
Was the investigator sufficiently independent?
What systems and information were examined?
What happened and when?
Was the activity authorized?
Was the behavior accidental, negligent, reckless, or intentional?
What was the security and business impact?
What evidence supports the conclusion?
What corrective actions were taken?
Were HR, Legal, Privacy, or management requirements addressed?
Was the corrective action verified?
What was learned from the investigation?
Final Principle
A security violation investigation should establish facts before assigning blame. The strongest investigation connects evidence, authorization, behavior, impact, root cause, risk, and corrective action into a defensible record.
Security Violation Investigation Lifecycle:
Report → Preserve → Contain → Plan → Investigate → Analyze → Validate → Conclude → Remediate → Verify → Close → Improve