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NET-40.2: Phishing & Spam Protection

NET 10 — Critical Protect

Mechanisms exist to utilize anti-phishing and spam protection technologies to detect and take action on unsolicited messages transported by electronic mail.

Renumbered: Formerly END-08 in SCF 2025.4.

Control Question: Does the organization utilize anti-phishing and spam protection technologies to detect and take action on unsolicited messages transported by electronic mail?

General (22)
Framework Mapping Values
CIS CSC 8.1 9.0 9.6 9.7
CIS CSC 8.1 IG2 9.6
CIS CSC 8.1 IG3 9.6 9.7
GovRAMP SI-08
GovRAMP Low+ SI-08
GovRAMP Moderate SI-08
GovRAMP High SI-08
MITRE ATT&CK 16 T1137 T1137.001 T1137.002 T1137.003 T1137.004 T1137.005 T1137.006 T1204 T1204.001 T1204.002 T1204.003 T1221 T1566 T1566.001 T1566.002 T1566.003 T1598 T1598.001 T1598.002 T1598.003
MPA Content Security Program 5.3.1 TS-1.9
NIST 800-53 R4 SI-8
NIST 800-53 R5.2 SI-08
NIST 800-53B R5 (moderate) (source) SI-08
NIST 800-53B R5 (high) (source) SI-08
NIST 800-82 R3 SI-08
NIST 800-82 R3 MODERATE OT Overlay SI-08
NIST 800-82 R3 HIGH OT Overlay SI-08
PCI DSS 4.0.1 (source) 5.4 5.4.1
PCI DSS 4.0.1 SAQ A-EP (source) 5.4.1
PCI DSS 4.0.1 SAQ C (source) 5.4.1
PCI DSS 4.0.1 SAQ C-VT (source) 5.4.1
PCI DSS 4.0.1 SAQ D Merchant (source) 5.4.1
PCI DSS 4.0.1 SAQ D Service Provider (source) 5.4.1
US (10)
EMEA (7)
APAC (3)
Framework Mapping Values
APAC India RBI PPI 2025 18.3.c
APAC Malaysia RMiT 2025 12.5(a) A5-A4(c)
APAC New Zealand NZISM 3.9 15.2.37.C.01

Capability Maturity Model

Level 0 — Not Performed

Practices are non-existent, based on the inability to demonstrate an implemented and operational capability. A reasonable person would conclude the control is not being performed.

Level 1 — Performed Informally

Endpoint Security (END) domain capabilities are ad hoc and inconsistent. Capability criteria associated with this control may include: ▪ Policies, standards & procedures associated with END domain capabilities provide limited coverage due to the depth and breadth of the existing documentation. ▪ Endpoint security management-related activities are decentralized (e.g., a localized/regionalized function) and uses non-standardized methods to implement secure, resilient and compliant practices. ▪ Anti-spam/phishing technologies are centralized and built into existing email capabilities.

Level 2 — Planned & Tracked

Endpoint Security (END) capabilities are requirements-driven, but are not standardized across the entity (e.g., local/regional level consistency). Capability criteria associated with this control reasonably expect the following criteria to exist: ▪ Policies and standards associated with END domain capabilities are formally documented and centrally-managed by the entity. ▪ Standardized Operating Procedures (SOP) associated with END domain capabilities are documented and maintained by process owners. ▪ IT and/or cybersecurity personnel work with business stakeholders and process owners to appropriately scope and reasonably implement cybersecurity and data protection controls associated with END domain capabilities to address applicable statutory, regulatory and/or contractual requirements for Technology Assets, Applications, Services and/or Data (TAASD). ▪ Endpoint security-related controls are primarily administrative and preventative in nature (e.g., policies, standards and procedures & guidelines). ▪ Endpoint security management may be a defined function (e.g., team or department) or assigned as an additional duty to existing IT and/or cybersecurity personnel. ▪ Anti-spam/phishing technologies are centralized and built into existing email capabilities.

Level 3 — Well Defined

Network Security (NET) capabilities are standardized across the entity for applicability to People, Processes, Technologies, Data and/or Facilities (PPTDF) to ensure consistency for Technology Assets, Applications, Services and/or Data (TAASD). Capability criteria associated with this control reasonably expect the following criteria to exist: ▪ Policies and standards associated with NET domain capabilities are formally documented and centrally-managed by the entity's Governance, Risk & Compliance (GRC) team, or similar function. ▪ Standardized Operating Procedures (SOP) associated with NET domain capabilities are well-documented and kept current by process owners. ▪ A network security management team, or similar function, is appropriately staffed and supported to implement and maintain NET domain capabilities. ▪ Technology is leveraged to enhance the efficiency and accuracy of network security operations (e.g., network management solution and log aggregator). ▪ The entity's Governance, Risk & Compliance (GRC) team, or similar function, works with business stakeholders and process owners to appropriately scope and reasonably implement cybersecurity and data protection controls associated with NET domain capabilities to address Minimum Compliance Requirements (MCR) (e.g., applicable statutory, regulatory and/or contractual requirements) and Discretionary Security Requirements (DSR) (e.g., entity-required controls). ▪ Secure Baseline Configurations (SBC) enforce the principles of least privileges and least functionality for boundary protection technologies. ▪ An implemented and operational capability exists to utilize anti-phishing and spam protection technologies to detect and take action on unsolicited messages transported by electronic mail.

Level 4 — Quantitatively Controlled

Endpoint Security (END) capabilities, in addition to being standardized across the entity and centrally managed to ensure consistency across Technology Assets, Applications, Services and/or Data (TAASD), efforts are metrics driven to provide sufficient insight for decision makers to predict optimal performance, ensure continued operations and/or identify areas for improvement. Capability criteria associated with this control reasonably expect the following criteria to exist: ▪ Applicable SCR-CMM Level 3 (Well Defined) capabilities are implemented and operational. ▪ Metrics reporting includes quantitative analysis of Key Performance Indicators (KPIs). ▪ Metrics reporting includes quantitative analysis of Key Risk Indicators (KRIs). ▪ Scope of metrics, KPIs and KRIs covers organization-wide cybersecurity and data protection controls, including functions performed by third-parties. ▪ Organizational leadership maintains a formal process to objectively review and respond to metrics, KPIs and KRIs (e.g., monthly or quarterly review). ▪ Based on metrics analysis, process improvement recommendations are submitted for review and are handled in accordance with change control processes. ▪ Business and technical stakeholders are involved in reviewing and approving proposed changes to evolve capabilities.

Level 5 — Continuously Improving

Utilize SCR-CMM Level 3 or Level 4 (if available) criteria definitions: ▪ There are no defined Level 5 criteria, since it is reasonable to assume a continuously-improving process is not necessary to operationalize this control. ▪ Level 5 capabilities should be considered “world-class” where the control builds on Level 4 capabilities, but are continuously improving through Artificial Intelligence (AI) and/or Machine Learning (ML) technologies. ▪ While it may be possible to develop responsive capabilities for this control through the use of AI and/or ML technologies, the criteria would be organization-specific to define.

Assessment Objectives

  1. NET-40.2_A01 spam protection mechanisms are employed at system entry points to detect unsolicited messages.
  2. NET-40.2_A02 spam protection mechanisms are employed at system entry points to act on unsolicited messages.
  3. NET-40.2_A03 spam protection mechanisms are employed at system exit points to detect unsolicited messages.
  4. NET-40.2_A04 spam protection mechanisms are employed at system exit points to act on unsolicited messages.

Evidence Requirements

E-NET-12 Email Security Configuration

Documented evidence of email domain reputation protections (DMARC, SPF, ARC) and phishing / spam protection configurations.

Network Security

Technology Recommendations

Micro/Small

  • Anti-spam / phishing solution

Small

  • Anti-spam / phishing solution

Medium

  • Anti-spam / phishing solution

Large

  • Anti-spam / phishing solution

Enterprise

  • Anti-spam / phishing solution

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