Anti-malware protection with EDR and email/web safeguards
Primary statement
Anti-malware protection operates layered: (1) endpoint anti-malware with EDR (behavioural detection beyond signatures) deployed on ALL endpoints — servers, workstations, mobile, gateways (SEBI PR.16); (2) daily signature updates and coverage gap tracking; (3) email protection — DMARC at p=reject, SPF, DKIM, anti-spam, anti-malware sandboxing, DLP, anti-spoofing of own domain (RBI PR.12); (4) removable media auto-scan on connection (PCI 5.3.3); (5) periodic evaluation of "not commonly affected" systems to confirm exemption still applies (PCI 5.2.3.1); (6) user awareness integrated (ISO A.8.7).
Audit-fatigue payoff
A unified anti-malware architecture — EDR coverage matrix + email protection stack + removable media controls + awareness integration — satisfies malware-protection requirements across all 11 contributing frameworks. The EDR deployment inventory + email DMARC posture + media scan logs are the consolidated evidence pack.
Strictness matrix
Scope
Scope: ALL endpoints — servers, workstations, mobile, gateways. No category exempt without documented "not commonly affected" exemption per PCI 5.2.3.1. EDR behavioural detection required beyond signature-only.
Ceiling source: sebi_cscrf:CSCRF.PR.16
Rationale: SEBI CSCRF PR.16 enumerates all endpoint categories; EDR behavioural requirement is uniquely strict. PCI 5.2.3.1 provides the exemption framework.
Threshold
Email threshold: DMARC at p=reject (not p=quarantine or p=none) for primary domains. SPF and DKIM aligned. Anti-spoofing of own domain mandatory. Inbound: anti-spam + anti-malware sandboxing + DLP. The p=reject DMARC policy is the binary threshold for email protection.
Ceiling source: rbi_csf:RBI.PR.12
Rationale: RBI CSF PR.12 p=reject DMARC policy is the strictest email threshold. Other frameworks accept p=quarantine or even p=none. The p=reject threshold is the audit-defensible reference for financial entities.
Method
Method: (1) anti-malware + EDR on all endpoints; (2) daily signature updates; (3) behavioural detection rules tuned to current threat landscape; (4) coverage gap tracking and remediation; (5) email stack — DMARC p=reject + SPF + DKIM + anti-spam + sandboxing + DLP + anti-spoofing; (6) removable media auto-scan + restriction to authorised devices (PCI 5.3.3 + RBI PR.13); (7) "not commonly affected" periodic re-evaluation per PCI 5.2.3.1; (8) user awareness integration per ISO A.8.7.
Ceiling source: sebi_cscrf:CSCRF.PR.16
Rationale: SEBI CSCRF PR.16 method is the most comprehensive single-control specification. Combined with RBI PR.12 email + PCI 5.3.3 media controls, this is the audit-defensible architecture.
Frequency
Signature updates: daily. EDR rule tuning: continuous. Coverage gap review: weekly minimum. Email DMARC alignment review: continuous (monitoring tools). "Not commonly affected" re-evaluation per PCI 5.2.3.1: at frequency defined in targeted risk analysis (typically annual). Removable media scan: on each insertion.
Ceiling source: sebi_cscrf:CSCRF.PR.16
Rationale: SEBI CSCRF PR.16 daily signature update + continuous EDR tuning is the strictest operational cadence.
Evidence
Required evidence: (1) anti-malware + EDR deployment inventory matched against endpoint inventory (any gap is a finding); (2) signature update logs; (3) EDR rule inventory + sample SOC alerts traced to response actions; (4) coverage gap register with remediation tracking; (5) email DMARC posture (online check / DMARC monitoring report); (6) SPF/DKIM/sandboxing/DLP configuration; (7) removable media scan logs; (8) "not commonly affected" re-evaluation records per PCI 5.2.3.1; (9) awareness training integration evidence.
Ceiling source: sebi_cscrf:CSCRF.PR.16
Rationale: SEBI CSCRF PR.16 evidence list with the deployment-inventory-match requirement is uniquely strict. Coverage gaps are the most common finding; explicit register closes the gap.
Auditor test pattern
Step 1: Inspect the anti-malware + EDR deployment inventory; reconcile against the endpoint inventory. Step 2: For any "not commonly affected" exemption, inspect the periodic re-evaluation. Step 3: Verify EDR behavioural detection rules are tuned (not just signature-based). Step 4: Verify email DMARC posture via DMARC analyser or SPF/DKIM/DMARC lookup; confirm p=reject for primary domains. Step 5: Sample 3 recent EDR alerts and trace to response actions. Step 6: Test removable media auto-scan on a sample endpoint. Step 7: Inspect awareness training malware module.
Common findings
Common 2024–26 findings: (1) Servers excluded from EDR (legacy AIX, mainframes, OT-style systems); (2) Coverage at 95% with the missing 5% being highest-risk endpoints; (3) Signature updates running but EDR behavioural detection rules untuned; (4) Email DMARC at p=none or p=quarantine, not p=reject — fails the strict threshold; (5) "Not commonly affected" exemption claimed without periodic re-evaluation; (6) Removable media auto-scan absent — USB policy theoretical; (7) Awareness training malware module generic, not linked to current phishing trends.