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Introduction
A threat actor has allegedly compromised the Foreigners’ Administration of the Serbian Ministry of Internal Affairs (MUP), putting the personal data of up to 180,000 individuals up for sale. The leaked data includes the names and unique ID numbers (JMBG) of 30,000 Serbian citizens, as well as the passport numbers and personal information of 150,000 foreigners who applied for residency in Serbia. This incident is a stark reminder that even state institutions can be vulnerable, and it underscores the critical need for proactive identity protection and robust data governance strategies.
Learning Objectives
- Analyze the tactics of a threat actor employing an extortion-based “double extortion” model.
- Implement basic system hardening commands on Linux and Windows to mitigate common vulnerabilities.
- Understand the key requirements for incident response and regulatory compliance following a data breach.
You Should Know
1. The Anatomy of a Double-Extortion Data Breach
The attacker in this incident is not using a traditional ransomware approach that solely encrypts files for a ransom. Instead, they are employing a “double extortion” tactic: data is exfiltrated from the affected environment before any encryption occurs. The group then threatens not only to withhold system restoration but also to publish the stolen information unless a ransom is paid. In this case, the threat actor first offered the data to a representative of the state, offering to destroy it if purchased. However, if no deal is made, the data will be sold to any interested buyer.
This strategy changes the risk calculus for the victim organization. Even if they have perfect backups to restore from a ransomware attack, the threat of public data exposure remains. For the individuals whose data is stolen, this means a lifelong risk of targeted phishing, identity theft, and other scams, as the data is likely to be sold and resold on the cybercriminal underground market.
How to Use This Information: If your organization faces a similar situation, do not engage with the attacker. Immediately activate your incident response team, isolate potentially compromised systems, and contact law enforcement. Use the following commands to check your own systems for suspicious outbound connections, a common sign of data exfiltration.
Linux: Check for established outbound connections on port 443 (HTTPS) and 80 (HTTP) sudo netstat -tunap | grep 'ESTABLISHED' | grep -E ':(80|443)\s' Windows: Find established connections and the associated processes netstat -ano | findstr "ESTABLISHED"
2. Immediate Post-Breach Hardening for Databases
Often, these breaches stem from poorly secured databases directly exposed to the internet. To prevent a similar fate, immediate hardening of database servers is critical. The Center for Internet Security (CIS) publishes detailed benchmarks for securing databases like MySQL, PostgreSQL, and Microsoft SQL Server, containing hundreds of specific configuration recommendations. A key step is moving databases from a public to a private subnet, restricting all inbound traffic except from authorized application servers. Additionally, network-level access controls should be strictly enforced.
How to Use This Information: Use the following commands to quickly assess the security posture of your database server. These commands help identify open ports and enforce firewall rules to limit access.
Linux (iptables): Allow only your application server (192.168.1.100) to access MySQL on port 3306 sudo iptables -A INPUT -p tcp -s 192.168.1.100 --dport 3306 -j ACCEPT sudo iptables -A INPUT -p tcp --dport 3306 -j DROP Save iptables rules (command varies by distribution) sudo iptables-save > /etc/iptables/rules.v4 Windows (PowerShell as Admin): Block all inbound traffic to port 1433 (SQL Server) except from a specific IP New-NetFirewallRule -DisplayName "Block SQL from Public" -Direction Inbound -Protocol TCP -LocalPort 1433 -Action Block New-NetFirewallRule -DisplayName "Allow SQL from App Server" -Direction Inbound -Protocol TCP -LocalPort 1433 -RemoteAddress 192.168.1.100 -Action Allow
3. API Security: The Forgotten Frontier
Many modern applications rely on APIs to connect databases to front-end interfaces. According to the OWASP API Security Top 10, the most common and impactful vulnerability is Broken Object Level Authorization (BOLA), present in over 40% of audited APIs. In the context of a government database, a vulnerable API could allow an attacker to bypass authorization checks and directly query the backend for records like JMBGs or passport numbers. This highlights the need for secure API development and rigorous testing.
How to Use This Information: API security should be a core part of the development lifecycle. All API calls should enforce strict authorization controls on the server-side, never trusting the client. Input validation is also critical.
Insecure API endpoint (vulnerable to IDOR/BOLA)
@app.route('/api/user/<int:user_id>')
def get_user(user_id):
No authorization check - any authenticated user can access any other user's data
user = User.query.get(user_id)
return jsonify(user.data)
Secure API endpoint
@app.route('/api/user/<int:user_id>')
@login_required
def get_user(user_id):
Check if the logged-in user has permission to access this specific resource
if current_user.id != user_id and not current_user.is_admin:
return jsonify({"error": "Unauthorized"}), 403
user = User.query.get(user_id)
return jsonify(user.data)
4. Cloud Hardening: Identity and Access Management (IAM)
As government agencies and businesses migrate to the cloud, the risk of misconfigured IAM policies grows. Attackers often exploit overly permissive roles or long-lived credentials to gain a foothold and move laterally within a cloud environment. The 2026 State of Cloud Security study shows that organizations are increasingly reducing long-lived cloud credentials and enacting more precise control over IAM permissions in AWS, Azure, and Google Cloud. The principle of least privilege—giving a user or service only the permissions it absolutely needs—is a cornerstone of cloud security.
How to Use This Information: Regularly audit your cloud IAM policies and enforce the use of Multi-Factor Authentication (MFA) for all user accounts. Here is an example of using the AWS CLI to list all IAM users and check if they have MFA enabled.
List all IAM users aws iam list-users --query 'Users[].UserName' --output table For a specific user, list their MFA devices aws iam list-mfa-devices --user-name <username> A simple script to list users without MFA (requires jq) for user in $(aws iam list-users --query 'Users[].UserName' --output text); do mfa_status=$(aws iam list-mfa-devices --user-name $user --query 'MFADevices' --output text) if [ -z "$mfa_status" ]; then echo "$user has NO MFA enabled" else echo "$user has MFA enabled" fi done
5. GDPR Compliance: The 72-Hour Rule
While Serbia is not an EU member state, it is a candidate country and many of its institutions process data of EU citizens, making them potentially subject to GDPR regulations if they offer goods or services to EU citizens or monitor their behavior. The GDPR mandates that data controllers must report a personal data breach to the relevant supervisory authority within 72 hours of becoming aware of it. This notification must include the nature of the breach, the categories and approximate number of data subjects involved, and the likely consequences of the breach.
How to Use This Information: Organizations must have a documented breach response plan in place. This plan should designate a Data Protection Officer (DPO) or a point of contact, outline internal escalation procedures, and pre-draft communication templates to meet the strict 72-hour timeline. After the immediate response, document all breaches, including the facts of the breach, its effects, and the remedial actions taken, as required by 33(5) of the GDPR. This documentation is crucial for demonstrating compliance to regulators.
What Undercode Say:
- The threat actor’s “offer to state” and threat of public sale is a classic extortion playbook. Do not pay. Engaging only incentivizes future attacks and does not guarantee data deletion.
- The combination of JMBG (similar to a Social Security Number) with names and residency details creates a high risk for identity theft. The danger lies not just in the data itself, but in the permanent, cumulative risk it poses to the individuals affected.
Prediction
This attack is a harbinger of a larger trend: politically motivated actors and cybercriminals will increasingly target government databases that aggregate sensitive citizen data. We will see a rise in “data hostage” situations, where the value is not in locking systems but in the threat of publicly exposing the most intimate details of individuals’ lives. The long-term consequence will be a significant erosion of public trust, forcing a painful, expensive reckoning with outdated data storage and security practices across the public and private sectors.
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Reported By: Milosrs Zlonamerni – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
