Why Finance Owns CSF Outcomes

Ransomware hits close calendars, payroll, and Treasury before it hits the press release.

Use CSF to organize controls already required by Internal Controls, SOX 404, Fraud Prevention, and Compliance Checklist.

The 6 Functions for Finance

Function Finance outcome Evidence
Govern Roles, risk appetite, oversight RACI + board minutes — see Board
Identify Asset and data inventory App + data-flow register
Protect Access, backup, payments MFA, lock-date, positive pay
Detect Anomalies in close/payroll Reconciliation + log review
Respond Playbook for payroll/treasury outage Tabletop + call tree
Recover Restore close within RTO Backup restore test

Minimum Control Set

  • Access: MFA, quarterly joiner/mover/leaver review for GL, bank, payroll — see QuickBooks vs Xero Controls.
  • Backup: immutable close + GL + Bookkeeping attachments, tested restore.
  • Payments: dual approval, callback for vendor changes, positive pay.
  • Change: approval + testing for finance app changes.
  • Vendors: risk-tier payroll, bank, and SaaS vendors; review SOC reports — see SOC 1 vs SOC 2.

Close Protection Plan

Freeze close systems during WD-0 to WD-5 — see Month-End Close. Monitor privileged access, suspend non-emergency changes, and retain logs for Audit Procedures.

Incident Playbook (Finance Page 1)

  1. Isolate, preserve logs, invoke treasurer + controller + counsel.
  2. Switch to manual payment approval and payroll contingency.
  3. Assess financial-reporting impact and disclosure — see SEC Reporting.
  4. Recover from tested backup, re-perform recs, document timeline.

Test twice yearly; report to Audit Committee.

Govern in Practice (The Function Everyone Skips)

Govern fails when it lives in a slide. Make it operational:

  1. RACI, one page. Name the risk owner (CFO), control owners (controller, payroll lead, IT admin), and the board recipient (audit committee) — see Board Minutes. Unsigned RACIs are wishes.
  2. Risk appetite in numbers. “Zero tolerance for payroll disruption; 4-hour RTO for payroll, 24-hour for close systems; $50k single-payment approval ceiling.” Numbers beat adjectives in incident reviews.
  3. Quarterly govern review. 30 minutes: open findings, vendor changes, access-review results, incident lessons. File minutes — the review itself is the evidence that governance operates, not just exists.

Link the register to ERM so cyber risk sits alongside financial and compliance risk in one board view.

Detect: What “Anomaly” Means in Finance

Generic SOC alerts drown finance teams. Tune detection to finance-specific tripwires:

Signal Source Response
New payee + first payment >$10k AP master log Hold payment, callback verification — see AP Fraud
Payroll file changed after approval Payroll audit log Freeze run, investigate before release
GL posted outside close window ERP access log Review with preparer; lock-date gap analysis
Mass download from finance share DLP/file audit Revoke, investigate, preserve logs
Failed MFA bursts on finance accounts IdP logs Force reset, review sessions

Review the tripwire report weekly — not the raw log firehose. Each true positive gets a ticket; each quarter without a test (simulated phish, restore drill) degrades the control rating. Retain evidence per Audit Procedures so SOX 404 and SOC 2 testing reuses the same packet — see SOC 1 vs SOC 2.

FAQ

What is the fastest win?

MFA + backup restore test + vendor-change callback. Three controls stop most finance loss.

Do we need new tools?

Usually no. Enforce controls in existing GL, bank, and payroll first, then add monitoring.

Next Steps

  1. Assign Govern owner and RACI this month.
  2. Map Protect controls to SOX/SOC evidence to avoid duplicate work.
  3. Tabletop payroll outage before year-end.