RansomEXX Banking Infrastructure Attack — How to Identify & Stay Safe

INDIA — By BharatSecure Threat Intelligence Team · Updated May 27, 2026

Severity: CRITICAL | View Full Scam Details

RansomEXX Banking Infrastructure Attack in India 2026: A Critical Cyber Threat to Our Banks

The RansomEXX Banking Infrastructure Attack is a critical ransomware threat targeting Indian banks, risking disruption to payment systems like UPI and locking vital banking data until hefty ransoms are paid.

What Is the RansomEXX Banking Infrastructure Attack?

The RansomEXX Banking Infrastructure Attack is a highly dangerous ransomware campaign aimed at crippling banking operations by locking data and systems. Emerging in 2024 and persisting into 2026, this threat specifically targets Indian banks’ IT infrastructure, including payment gateways and transaction processing systems. The cybercriminals leverage supply chain vulnerabilities by compromising Brontoo Tech, a software provider trusted by multiple Indian banks. This has made the attack particularly effective because it exploits a trusted vendor’s software to penetrate bank systems.

Indian banks increasingly rely on complex IT setup—cloud servers, Jenkins automation tools, and other software components. The attackers abuse common weaknesses here, such as misconfigured Jenkins servers or unsecured cloud environments. Once inside, they deploy the RansomEXX ransomware, which encrypts critical data and locks down operations. As a result, popular payment platforms like Unified Payments Interface (UPI), used daily by tens of millions of Indians, face outages and transaction failures. This campaign’s severity is rated 10/10 on risk scales due to the potential financial loss and broad disruption it causes.

The Reserve Bank of India (RBI), CERT-In (Indian Computer Emergency Response Team), and the Indian Cyber Crime Coordination Centre (I4C) have issued advisories warning banks and financial institutions about this ransomware threat. These advisories urge immediate vulnerability scans and strengthening of IT infrastructure defenses against supply chain compromise.

How This Scam Works — Step by Step

1. Supply Chain Compromise: Hackers target Brontoo Tech, a software vendor servicing many Indian banks, injecting malicious code into legitimate software updates.
2. Scanning for Vulnerabilities: Using automated tools, they scan banks’ IT environments to find specific weak points, such as poorly secured Jenkins CI/CD servers or cloud platforms with default credentials.
3. Unauthorized Access: Exploiting these weaknesses, attackers gain entry into banking networks, often moving laterally to control multiple servers.
4. Deploying Ransomware: Once inside, they release the RansomEXX ransomware to encrypt critical banking data, locking system access and operations entirely.
5. Demanding Ransom: A ransom note appears demanding payment in cryptocurrencies, warning that failure to comply will result in permanent data loss and system shutdown.
6. Disrupting Banking Services: With internal systems frozen, payment gateways like UPI and NEFT face outages, causing transaction failures and widespread financial disruption.
7. Public Impact: Millions of Indian users experience failed transactions, delayed refunds, and blocked account access, triggering panic and financial distress.

Real Warning Signs to Watch For

• Sudden unexplained failures or downtime in UPI or bank app transactions.
• Alerts or notifications from banks about system maintenance or security updates without clear explanations.
• Emails or messages (sometimes spoofed) claiming urgent system failures demanding user credentials or urging them to click suspicious links.
• Unexpected requests to install software updates or plugins on internet banking systems.
• Sudden increase in OTPs or transaction alerts that you did not initiate.
• Slow or unresponsive banking portals, especially during peak transaction hours.
• Notifications or messages from your bank about a suspected breach or security incident.

What Happens to Victims

Victims of the RansomEXX attack face serious financial and emotional consequences. Indian banks may temporarily suspend UPI transactions, affecting daily payments for millions—from grocery shopping to salary transfers. The delay or failure of refunds and payments causes significant inconvenience. If the ransomware hits Aadhaar-linked systems, personal identity data could be indirectly at risk.

Customers may experience blocked accounts, leading to difficulty accessing funds. In some cases, ransom demands pressure banks to pay attackers, which could indirectly impact customers through service disruptions. Fraudsters could exploit SIM swaps or steal OTPs during this turmoil, further risking unauthorized fund transfers and identity theft.

The mental stress caused by frozen bank accounts and interrupted financial services affects businesses and individuals alike, especially daily wage earners and small merchants reliant on digital payments.

What RBI and CERT-In Say

The Reserve Bank of India has issued multiple statements emphasizing the importance of cybersecurity in banking infrastructure. RBI requires banks to conduct regular vulnerability assessments and promptly report incidents to CERT-In. CERT-In has included ransomware threats like RansomEXX in its recent threat advisories and recommends immediate patching of known vulnerabilities in Jenkins and cloud services.

Indian Cyber Crime Coordination Centre (I4C) encourages all banks and financial entities to implement strict third-party risk management frameworks given the history of supply chain compromises. RBI helpline and the national cybercrime helpline (dial 1930) are available for reporting incidents and seeking assistance.

How to Protect Yourself

1. Use Official Bank Apps Only: Always download and update banking apps like BHIM UPI from trusted app stores.
2. Avoid Clicking Suspicious Links: Never click on unknown email or WhatsApp message links claiming urgent banking issues.
3. Regularly Change Internet Banking Passwords: Use strong, unique passwords and update them frequently.
4. Enable Multi-Factor Authentication (MFA): Wherever available, use additional authentication for banking logins.
5. Monitor Bank Transaction Alerts: Immediately report any unauthorized OTPs or transaction messages to your bank.
6. Do Not Share OTPs or Personal Details: Never share One Time Passwords or Aadhaar, PAN details over phone or online.
7. Stay Informed About Bank Security Updates: Follow official bank or RBI announcements about system updates or advisories.

What to Do If You’ve Been Targeted

• Immediately contact your bank’s customer service or cybersecurity team to report suspicious activity.
• Call the RBI helpline for banking fraud at 1800-112-191 or the cybercrime helpline at 1930.
• File a complaint on the National Cyber Crime Reporting Portal at cybercrime.gov.in.
• Request your bank to freeze or temporarily block your account to prevent fraudulent transactions.
• Change all your banking and login passwords and alert your mobile network provider if you suspect SIM swap fraud.
• Save all related communication and evidence for investigation.

Frequently Asked Questions

Q: Can paying the ransom guarantee my banking data will be restored?
No. Paying ransom to RansomEXX attackers does not guarantee full data recovery or system restoration. It also encourages criminal activity. Banks typically rely on backups and incident response teams to recover safely.

Q: How can I check if my bank is vulnerable to this ransomware attack?
Individual customers cannot verify this. However, banks disclose such incidents if severe and alert users through official channels. Always follow RBI and bank advisories for updates.

Q: Is UPI safe to use during these ransomware threats?
UPI itself remains secure, but service disruptions can occur during active ransomware attacks on bank infrastructure. Always monitor transaction alerts and report any anomalies immediately.

Stay safe from banking scams and ransomware attacks by verifying suspicious messages and updates at BharatSecure.app — your trusted partner in digital fraud awareness.