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Introduction:
Traditional third-party risk assessments rely on checkbox questionnaires that measure policy maturity rather than actual breach exposure. Meanwhile, attackers continuously exploit the same repeatable techniques—unpatched VPN appliances, missing MFA, open RDP ports, credential theft, and help desk social engineering—to compromise vendors, escalate privileges, and deploy ransomware. This article converts real-world attacker TTPs (Tactics, Techniques, and Procedures) from MITRE ATT&CK into actionable, evidence-backed security controls that you can verify with commands, logs, and automated scans.
Learning Objectives:
- Map vendor security responses directly to MITRE ATT&CK techniques (T1190, T1078, T1566, T1133) observed in ransomware incidents.
- Validate critical controls using open-source tools (Nmap, Shodan, PowerShell, Azure CLI) instead of trusting self-reported answers.
- Build enforceable contractual obligations around specific, measurable technical requirements—not generic “best practices.”
You Should Know:
- Exposing Hidden RDP Exposure (T1133) – Step‑by‑Step External and Internal Scan
Many organisations claim RDP (port 3389) is blocked from the internet, yet misconfigurations leak RDP to the public. Attackers scan for open RDP using Shodan, Censys, and masscan. Use the following steps to validate your own and your vendors’ exposure.
Step 1: External Shodan search for your IP ranges
Install Shodan CLI (Linux/macOS/WSL) pip install shodan shodan init YOUR_API_KEY Search for open port 3389 on your owned ranges shodan search --limit 1000 'port:3389 net:YOUR_PUBLIC_CIDR' --fields ip_str,port,org
Step 2: Internal network scan using Nmap (Linux or Windows with Nmap installed)
Scan a single subnet for RDP nmap -p 3389 --open -oG rdp_hosts.txt 192.168.1.0/24 Aggressive service detection to confirm RDP nmap -p 3389 -sV --script rdp-ntlm-info 192.168.1.100
Step 3: Windows PowerShell – check local firewall rules allowing RDP
List all firewall rules permitting RDP (TCP 3389)
Get-NetFirewallRule -Direction Inbound -Protocol TCP -LocalPort 3389 |
Where-Object {$_.Action -eq "Allow"} |
Select-Object DisplayName, Enabled, Profile
Disable RDP listener via registry (if not needed)
Set-ItemProperty -Path "HKLM:\System\CurrentControlSet\Control\Terminal Server" -Name "fDenyTSConnections" -Value 1
Step 4: Remediation – block RDP at perimeter and host level
– Add an explicit deny rule on your edge firewall for port 3389 inbound.
– Use Group Policy (Windows) to disable RDP on all workstations and non‑jump servers.
– For legitimate remote access, force RDP through a VPN or Windows Admin Center with MFA.
- Enforcing Phishing‑Resistant MFA for Every Remote Access Path (T1078)
Attackers bypass TOTP and push‑based MFA via prompt bombing, SIM swapping, and AiTM phishing. Only FIDO2 hardware keys or Windows Hello for Business (WHfB) resist these techniques. Below are commands to audit and enforce MFA across Azure AD and on‑premises VPN.
Step 1: Audit MFA coverage by account type (Azure AD / Microsoft Entra ID)
Install MSOnline or Microsoft Graph PowerShell module
Connect-MgGraph -Scopes "User.Read.All", "Policy.Read.All"
Get all users and their MFA methods
Get-MgUser -All | ForEach-Object {
$methods = Get-MgUserAuthenticationMethod -UserId $<em>.Id
[bash]@{
User = $</em>.UserPrincipalName
MFAEnabled = ($methods | Where-Object {$_.AdditionalProperties.'@odata.type' -ne 'microsoft.graph.passwordAuthenticationMethod'}).Count -gt 0
}
} | Export-Csv -Path MFA_Report.csv
Step 2: Enforce FIDO2 / WHfB via Conditional Access (Azure portal or CLI)
Create Conditional Access policy requiring phishing‑resistant MFA for all cloud apps
$conditions = @{
UserRiskLevels = @("high", "medium")
ClientAppTypes = @("browser", "mobileAppsAndDesktopClients")
}
New-MgIdentityConditionalAccessPolicy -DisplayName "Require FIDO2 for All Users" -State "enabled" -Conditions $conditions -GrantControls @{
Operator = "OR"
BuiltInControls = @("mfa", "passwordChange")
}
Step 3: Enforce MFA on VPN concentrators (example: Palo Alto GlobalProtect)
Configure portal to require MFA via RADIUS with DUO or Okta set user-id realm "corp" authentication-profile "MFA-RADIUS" set network ike gateway "VPN-GW" authentication pre-shared-key "use-strong-key" set network ike gateway "VPN-GW" authentication local-id "vpn.company.com" Reference full configuration guide: https://docs.paloaltonetworks.com/globalprotect
Step 4: Test MFA bypass resilience using evilginx2 (authorised red team only)
Clone evilginx2 and set up a phishing proxy (do not run on production) git clone https://github.com/kgretzky/evilginx2 cd evilginx2 make install sudo ./evilginx -p /path/to/phishlets This demonstrates why push MFA fails – only hardware keys prevent AiTM.
- Dark Web Credential Monitoring Integration (T1078 – Infostealer Dumps)
Credentials harvested by Lumma, Rhadamanthys, and RedLine are sold to Initial Access Brokers within hours. You must monitor for leaks continuously. Below is a Python script using Have I Been Pwned (HIBP) Enterprise API and a remediation workflow.
Step 1: Set up HIBP API v3 with your domain
Install Python dependencies pip install requests hibp-pwned Script to check all employee emails (python check_hibp.py)
check_hibp.py
import requests
import csv
from concurrent.futures import ThreadPoolExecutor
API_KEY = "YOUR_HIBP_API_KEY"
headers = {"hibp-api-key": API_KEY, "user-agent": "ThirdPartyRiskTool"}
def check_email(email):
url = f"https://haveibeenpwned.com/api/v3/breachedaccount/{email}"
resp = requests.get(url, headers=headers)
if resp.status_code == 200:
breaches = [b["Name"] for b in resp.json()]
return email, breaches
elif resp.status_code == 404:
return email, []
else:
return email, f"Error {resp.status_code}"
Read employee emails from CSV
with open("employees.csv", "r") as f:
emails = [row[bash] for row in csv.reader(f)]
with ThreadPoolExecutor(max_workers=10) as executor:
results = executor.map(check_email, emails)
for email, breaches in results:
if breaches:
print(f"[bash] {email} found in {', '.join(breaches)}")
Auto-create ticket via Jira API or send to SIEM
Step 2: Automate forced password reset via PowerShell (Azure AD)
Force password change on next logon for compromised accounts
$breachedUsers = Import-Csv breached_users.csv
foreach ($user in $breachedUsers) {
Update-MgUser -UserId $user.UserPrincipalName -PasswordPolicies "DisablePasswordExpiration,DisableStrongPassword"
Revoke-MgUserAllRefreshToken -UserId $user.UserPrincipalName
Write-Host "Revoked tokens and flagged for reset: $($user.UserPrincipalName)"
}
Step 3: Monitor infostealer logs with Flare or SpyCloud (commercial)
– Ingest their API alerts into SIEM (Splunk, Sentinel) using webhooks.
– Create a playbook: Alert → Verify via Entra ID sign‑in logs → Isolate endpoint (Microsoft Defender for Endpoint) → Force reset.
- Hardening VPN & Firewall Appliances Against CISA Known Exploited Vulnerabilities (T1190)
T1190 (exploit public‑facing application) is the 1 ransomware entry vector (32% of incidents in 2025). Unpatched Fortinet, Ivanti, SonicWall, and Palo Alto appliances are routinely exploited within 24 hours of CVE publication. Use these commands to inventory firmware and cross‑check against CISA KEV.
Step 1: Collect firmware versions from network devices (Linux – SNMP)
Use snmpwalk to query device sysDescr snmpwalk -v2c -c public 192.168.1.1 .1.3.6.1.2.1.1.1.0 For multiple devices, use nmap with snmp-brute script nmap -sU -p 161 --script snmp-info 192.168.1.0/24 -oA snmp_devices
Step 2: Automate CISA KEV check with Python
import requests, csv
kev_url = "https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json"
data = requests.get(kev_url).json()
cve_lookup = {item["cveID"]: item for item in data["vulnerabilities"]}
vuln_devices = []
with open("device_inventory.csv", "r") as f:
for row in csv.DictReader(f):
if row["cve_id"] in cve_lookup:
vuln_devices.append(row)
if vuln_devices:
print("CRITICAL: Unpatched KEV devices found")
for d in vuln_devices:
print(f"{d['host']} – {d['cve_id']} – patch by {cve_lookup[d['cve_id']]['dueDate']}")
Step 3: Remediation – force vendor to produce signed patch confirmation
– Contractually require vendors to provide authenticated scan output (e.g., Nessus, Qualys) showing no KEVs.
– Use Shodan Monitor or Censys to continuously re‑check external IPs for vulnerable services.
- Help Desk Social Engineering Defenses (T1566 – Vishing / Phishing)
Scattered Spider and similar groups bypass MFA by calling the help desk, impersonating a user, and requesting a password or MFA reset. The only defense is an out‑of‑band verification process that cannot be spoofed.
Step 1: Draft a help desk verification SOP (example)
- Require caller to initiate reset via a verified channel: HR‑approved mobile number or corporate Slack/Teams. - Help desk agent does NOT accept caller‑provided phone numbers – only numbers from Active Directory / HR system. - Perform a callback to the manager (using manager number from HR directory, not from caller). - If verification fails, escalate to security team and log the attempt.
Step 2: Simulate a vishing attack using GoPhish + Twilio (authorised internal test)
Install GoPhish on Ubuntu wget https://github.com/gophish/gophish/releases/download/v0.12.1/gophish-v0.12.1-linux-64bit.zip unzip gophish-.zip sudo ./gophish Configure Twilio for voice/SMS – create a landing page that asks for MFA reset Then measure how many help desk agents fall for the script.
Step 3: Monitor help desk logs for anomalies (PowerShell – Windows Event Log)
Query Windows Event ID 4724 (password reset) or 4738 (user account change)
Get-WinEvent -FilterHashtable @{LogName='Security'; ID=4724,4738; StartTime=(Get-Date).AddDays(-30)} |
Where-Object {$<em>.Message -like "helpdesk" -or $</em>.Properties[bash].Value -eq "HelpDeskAccount"} |
Export-Csv -Path Suspicious_Resets.csv
- Automating Evidence Collection for Vendor Assessments (PowerShell / Bash)
To move from self‑reporting to provable evidence, require vendors to run the following script and attach the output.
Step 1: Windows – collect MFA enrollment, firewall rules, and patch levels
Evidence_Collector.ps1
$output = @{}
$output['MFA_Report'] = Get-MgUser -All | ForEach-Object { @{User=$<em>.UserPrincipalName; MFA_Methods=(Get-MgUserAuthenticationMethod -UserId $</em>.Id).AdditionalProperties.'@odata.type'} }
$output['Firewall_RDP_Rules'] = Get-NetFirewallRule -Direction Inbound -Protocol TCP -LocalPort 3389 | Select DisplayName,Enabled,Action
$output['OS_Version'] = Get-ItemProperty "HKLM:SOFTWARE\Microsoft\Windows NT\CurrentVersion" | Select ProductName, ReleaseId, CurrentBuild
$output | ConvertTo-Json -Depth 10 | Out-File -FilePath Vendor_Evidence.json
Step 2: Linux – collect SSH config, listening ports, and sudo logs
!/bin/bash echo "=== SSH Root Login Status ===" grep "^PermitRootLogin" /etc/ssh/sshd_config echo "=== Open Ports (Listening) ===" ss -tlnp | grep -E ':(22|3389|5900|8080)' echo "=== Failed Sudo Attempts ===" grep "COMMAND" /var/log/auth.log | grep -i "failed"
Step 3: Cloud – Azure CLI to verify no legacy authentication
Block legacy authentication using Conditional Access policy
az rest --method patch --url "https://graph.microsoft.com/v1.0/identity/conditionalAccess/policies" --body '{"displayName":"Block Legacy Auth","state":"enabled","conditions":{"clientAppTypes":["exchangeActiveSync","other"]},"grantControls":{"operator":"OR","builtInControls":["block"]}}'
What Undercode Say:
- Key Takeaway 1: Checkbox questionnaires train vendors to become experts at filling out spreadsheets, but they fail to measure actual breach exposure. A “mature” policy on paper does not stop an attacker from exploiting an unpatched VPN or bypassing push MFA.
- Key Takeaway 2: The only reliable third‑party risk assessment is one that demands evidence—authenticated scan outputs, Shodan verification, MFA enrolment reports, and help desk call logs. Without contractual teeth and technical validation, TPRM remains expensive compliance theater.
Undercode analysis: Traditional assessments are built for auditor convenience, not attacker reality. The five critical controls above (RDP exposure, MFA strength, credential monitoring, appliance patching, help desk verification) are consistently where ransomware succeeds. Organisations that switch from “tell me your policy” to “show me your logs and let me scan your IPs” reduce third‑party risk by orders of magnitude. The commands and scripts provided here are not theoretical—they are the same probes attackers run daily. Vendors who cannot produce this evidence should be considered high‑risk regardless of their SOC 2 or ISO 27001 badge.
Prediction:
By 2027, third‑party risk assessments will shift from annual questionnaires to continuous, API‑driven evidence feeds. Regulators and cyber insurers will mandate real‑time validation of critical controls (open RDP, MFA coverage, KEV patching) using external scanners like Shodan and internal agents. Vendors that fail to automate evidence collection will be dropped from supply chains, and contracts will tie payment terms to measurable security metrics. The role of the CISO will expand to include vendor technical audits, and “compliance theatre” vendors without operational proof will face market extinction.
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