Instructure Data Breach: Edtech Security Detection and Response Guide

---
title: Suspicious Bulk User Data Export from Educational Platforms
id: 9a8b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects bulk export activities from learning management systems or educational databases that may indicate data exfiltration
references:
  - https://www.securityweek.com/edtech-firm-instructure-discloses-data-breach/
author: Security Arsenal
date: 2025/01/16
tags:
  - attack.exfiltration
  - attack.t1567.001
logsource:
  category: database
  product: postgresql
detection:
  selection:
    query|contains:
      - 'SELECT * FROM users'
      - 'SELECT * FROM students'
      - 'SELECT * FROM enrollments'
      - 'SELECT * FROM user_messages'
  condition: selection
falsepositives:
  - Legitimate administrative reporting
  - Scheduled data exports for compliance
level: high
---
title: Unusual Authentication Patterns for Edtech Services
id: 1b2c3d4e-5f6a-7b8c-9d0e-1f2a3b4c5d6e
status: experimental
description: Detects anomalous authentication patterns that may indicate credential stuffing or brute force attacks against educational platforms
references:
  - https://www.securityweek.com/edtech-firm-instructure-discloses-data-breach/
author: Security Arsenal
date: 2025/01/16
tags:
  - attack.initial_access
  - attack.t1078.004
logsource:
  category: webserver
  product: nginx
detection:
  selection:
    cs-method: 'POST'
    cs-uri-stem|contains:
      - '/login'
      - '/api/v1/login'
      - '/oauth/token'
    sc-status:
      - 401
      - 403
falsepositives:
  - Legitimate password reset events
  - Integration testing
level: medium
---
title: Suspicious Service Configuration Changes on LMS Platform
id: 2c3d4e5f-6a7b-8c9d-0e1f-2a3b4c5d6e7f
status: experimental
description: Detects configuration changes that may indicate unauthorized access or service disruption attempts
references:
  - https://www.securityweek.com/edtech-firm-instructure-discloses-data-breach/
author: Security Arsenal
date: 2025/01/16
tags:
  - attack.defense_evasion
  - attack.t1562.001
logsource:
  category: process_creation
  product: linux
detection:
  selection:
    CommandLine|contains:
      - 'systemctl stop'
      - 'systemctl restart'
      - 'service canvas stop'
    Image|endswith:
      - '/bin/systemctl'
      - '/usr/sbin/service'
falsepositives:
  - Legitimate maintenance activities
  - Scheduled service restarts
level: high

// Hunt for bulk user data access patterns indicative of exfiltration
let TimeRange = ago(7d);
let AuthThreshold = 50;
let DataAccessThreshold = 1000;
// Look for authentication anomalies
SecurityEvent
| where TimeGenerated > TimeRange
| where EventID in (4624, 4625, 4768, 4769, 4771)
| where TargetUserName has '@'
| summarize FailedLogins = countif(EventID == 4625), 
            SuccessfulLogins = countif(EventID == 4624),
            UniqueIPs = dcount(IpAddress),
            FirstSeen = min(TimeGenerated),
            LastSeen = max(TimeGenerated)
            by TargetUserName, AccountType
| where FailedLogins > AuthThreshold or (SuccessfulLogins > AuthThreshold and UniqueIPs > 5)
| extend RiskScore = iff(FailedLogins > AuthThreshold, 80, 60)
| sort by RiskScore desc
// Look for bulk data access
| join kind=inner (
    Syslog
    | where TimeGenerated > TimeRange
    | where Facility == 'local0' and SeverityLevel == 'info'
    | where ProcessName contains 'canvas' or ProcessName contains 'postgres'
    | where SyslogMessage contains 'SELECT' or SyslogMessage contains 'COPY'
    | extend RecordCount = extract('([0-9]+) rows?', 1, SyslogMessage, typeof(long))
    | summarize TotalRecords = sum(RecordCount), QueryCount = count() by HostName, ProcessName
    | where TotalRecords > DataAccessThreshold or QueryCount > 100
) on $left.TargetUserName == $right.HostName

-- Hunt for suspicious network connections potentially indicating data exfiltration
SELECT Connection.Pid, Connection.Family, Connection.RemoteAddress, 
       Connection.RemotePort, Connection.State, Connection.Uid, 
       P.Name as ProcessName, P.Cmdline, P.Username
FROM foreach(row={
    SELECT Pid FROM pslist()
}, query={
    SELECT * FROM netstat(pid=_Pid)
}) AS Connection
LEFT JOIN pslist() AS P ON Connection.Pid = P.Pid
WHERE Connection.State = 'ESTABLISHED'
  AND Connection.RemotePort NOT IN (22, 443, 80, 8080)
  AND (P.Name =~ 'postgres' OR P.Name =~ 'nginx' OR P.Name =~ 'ruby')
  AND Connection.RemoteAddress NOT =~ '^(10\\.|172\\.1[6-31]\\.|192\\.168\\.)'

-- Hunt for suspicious process execution patterns on edtech servers
SELECT Pid, Ppid, Name, CommandLine, Exe, Username, CreateTime, Cwd
FROM pslist()
WHERE Name IN ('curl', 'wget', 'python', 'perl', 'nc', 'ncat', 'bash', 'sh')
  AND CommandLine =~ '(http|https|ftp)://'
  AND Username NOT IN ('root', 'daemon', 'postgres')
  AND Exe NOT IN ('/usr/bin/curl', '/usr/bin/wget', '/usr/bin/python3', '/usr/bin/perl')

#!/bin/bash
# Instructure Breach Response: Security Hardening Script
# Run this script on Linux-based Canvas/LMS infrastructure

echo "[*] Starting Instructure Breach Response and Hardening..."

# 1. Audit recent user access to the database
echo "[+] Checking for recent database access patterns..."
sudo -u postgres psql -c "
SELECT usename, application_name, client_addr, state, 
       COUNT(*) as connection_count,
       MAX(backend_start) as last_connection
FROM pg_stat_activity 
WHERE backend_start > NOW() - INTERVAL '7 days'
  AND datname = 'canvas_production'
GROUP BY usename, application_name, client_addr, state
HAVING COUNT(*) > 100 OR state = 'active'
ORDER BY connection_count DESC;
"

# 2. Identify users with excessive privileges
echo "[+] Auditing database role privileges..."
sudo -u postgres psql -c "
SELECT rolname, rolcreaterole, rolcreatedb, rolcanlogin, rolsuper
FROM pg_roles 
WHERE rolcreaterole = true 
   OR rolcreatedb = true 
   OR rolsuper = true
   AND rolname NOT IN ('postgres', 'rdsadmin', 'canvas');
"

# 3. Check for suspicious service modifications
echo "[+] Verifying Canvas service integrity..."
systemctl status canvas-delayed-job --no-pager
systemctl status canvas-init --no-pager
systemctl status nginx --no-pager

# 4. Review recent authentication logs for anomalies
echo "[+] Checking for authentication anomalies..."
awk '($9 ~ /401|403/ && $1 ~ /^([0-9]{1,3}\.){3}[0-9]{1,3}/)' \
    /var/log/nginx/access.log \
    | awk '{print $1}' | sort | uniq -c | sort -rn | head -20

# 5. Enforce MFA verification (if using Okta, Azure AD, or SAML)
echo "[+] Verifying SSO/MFA configuration status..."
if [ -f "/etc/canvas/canvas.yml" ]; then
    grep -A 5 "authentication_providers" /etc/canvas/canvas.yml | grep -E "(sso|oidc|saml|cas)"
fi

# 6. Check for data export activities in logs
echo "[+] Searching for bulk data export activities..."
grep -i "COPY\|SELECT.*FROM.*users\|SELECT.*FROM.*students" \
    /var/log/postgresql/*.log \
    | tail -50

echo "[*] Hardening complete. Review findings above and take appropriate action."