The biggest ransomware attacks of 2023 | Kaspersky official blog

Time was when any ransomware incident would spark a lively press and public reaction. Fast forward to the present, and the word “ransomware” in a headline doesn’t generate nearly as much interest: such attacks have become commonplace. Nonetheless, they continue to pose a grave threat to corporate security. This review spotlights the biggest and most high-profile incidents that occurred in 2023.

January 2023: LockBit attack on the UK’s Royal Mail

The year kicked off with the LockBit group attacking Royal Mail, the UK’s national postal service. The attack paralyzed international mail delivery, leaving millions of letters and parcels stuck in the company’s system. On top of that, the parcel tracking website, online payment system, and several other services were also crippled; and at the Royal Mail distribution center in Northern Ireland, printers began spewing out copies of the LockBit group’s distinctive orange ransom note.

As is commonly the case with modern ransomware attacks, LockBit threatened to post stolen data online unless the ransom was paid. Royal Mail refused to pay up, so the data ended up being published.

February 2023: ESXiArgs attacks VMware ESXi servers worldwide

February saw a massive automated ESXiArgs ransomware attack on organizations through the RCE vulnerability CVE-2021-21974 in VMware ESXi servers. Although VMware released a patch for this vulnerability back in early 2021, the attack left more than 3000 VMware ESXi servers encrypted.

The attack operators demanded just over 2BTC (around $45,000 at the time of the attack). For each individual victim they generated a new Bitcoin wallet and put its address in the ransom note.

Just days after the attack began, the cybercriminals unleashed a new strain of the cryptomalware, making it far harder to recover encrypted virtual machines. To make their activities more difficult to trace, they also stopped giving out ransom wallet addresses, prompting victims to make contact through the P2P messenger Tox instead.

March 2023: Clop group widely exploits a zero-day in GoAnywhere MFT

In March 2023, the Clop group began widely exploiting a zero-day vulnerability in Fortra’s GoAnywhere MFT (managed file transfer) tool. Clop is well-known for its penchant for exploiting vulnerabilities in such services: in 2020–2021, the group attacked organizations through a hole in Accelon FTA, switching in late 2021 to exploiting a vulnerability in SolarWinds Serv-U.

In total, more than 100 organizations suffered attacks on vulnerable GoAnywhere MFT servers, including Procter & Gamble, the City of Toronto, and Community Health Systems — one of the largest healthcare providers in the U.S.

April 2023: NCR Aloha POS terminals disabled by BlackCat attack

In April, the ALPHV group (aka BlackCat —  after the ransomware it uses) attacked NCR, a U.S. manufacturer and servicer of ATMs, barcode readers, payment terminals, and other retail and banking equipment.

The ransomware attack shut down the data centers handling the Aloha POS platform — which is used in restaurants, primarily fast food — for several days.

Essentially, the platform is a one-stop shop for managing catering operations: from processing payments, taking online orders, and operating a loyalty program, to managing the preparation of dishes in the kitchen and payroll accounting. As a result of the ransomware attack on NCR, many catering establishments were forced to revert to pen and paper.

May 2023: Royal ransomware attack on the City of Dallas

Early May saw a ransomware attack on municipal services in Dallas, Texas — the ninth most populous city in the U.S. Most affected were IT systems and communications of the Dallas Police Department, and printers on the City of Dallas network began churning out ransom notes.

Later that month, there was another ransomware attack on an urban municipality: the target this time was the City of Augusta in the U.S. state of Georgia, and the perpetrators were the BlackByte group.

June 2023: Clop group launches massive attacks through zero-days in MOVEit Transfer

In June, the same Clop group responsible for the February attacks on Fortra GoAnywhere MFT began exploiting a zero-day vulnerability in another managed file transfer tool — Progress Software’s MOVEit Transfer.

This ransomware attack — one of the largest incidents of the year — affected numerous organizations, including the oil company Shell, the New York City Department of Education, the BBC media corporation, the British pharmacy chain Boots, the Irish airline Aer Lingus, the University of Georgia, and the German printing equipment manufacturer Heidelberger Druckmaschinen.

July 2023: University of Hawaii pays ransom to the NoEscape group

In July, the University of Hawaii admitted to paying off ransomwarers. The incident itself occurred a month earlier when all eyes were fixed on the attacks on MOVEit. During that time, a relatively new group going by the name of NoEscape infected one of the university departments, Hawaiian Community College, with ransomware.

Having stolen 65GB of data, the attackers threatened the university with publication. The personal information of 28,000 people was apparently at risk of compromise. It was this fact that convinced the university to pay the ransom to the extortionists.

Of note is that university staff had to temporarily shut down IT systems to stop the ransomware from spreading. Although the NoEscape group supplied a decryption key upon payment of the ransom, the restoration of the IT infrastructure was expected to take two months.

August 2023: Rhysida targets the healthcare sector

August was marked by a series of attacks by the Rhysida ransomware group on the healthcare sector. Prospect Medical Holdings (PMH), which operates 16 hospitals and 165 clinics across several American states, was the organization that suffered the most.

The hackers claimed to have stolen 1TB of corporate documents and a 1.3 TB SQL database containing 500,000 social security numbers, passports, driver’s licenses, patient medical records, as well as financial and legal documents. The cybercriminals demanded a 50BTC ransom (then around $1.3 million).

September 2023: BlackCat attacks Caesars and MGM casinos

In early September, news broke of a ransomware attack on two of the biggest U.S. hotel and casino chains — Caesars and MGM — in one stroke. Behind the attacks was the ALPHV/BlackCat group, mentioned above in connection with the assault on the NCR Aloha POS platform.

The incident shut down the companies’ entire infrastructure — from hotel check-in systems to slot machines. Interestingly, the victims responded in very different ways. Caesars decided to pay the extortionists $15 million, half of the original $30 million demand.

MGM chose not to pay up, but rather to restore the infrastructure on its own. The recovery process took nine days, during which time the company lost $100 million (its own estimate), of which $10 million was direct costs related to restoring the downed IT systems.

October 2023: BianLian group extorts Air Canada

A month later, the BianLian group targeted Canada’s flag carrier, Air Canada. The attackers claim they stole more than 210GB of various information, including employee/supplier data and confidential documents. In particular, the attackers managed to steal information on technical violations and security issues of the airline.

November 2023: LockBit group exploits Citrix Bleed vulnerability

November was remembered for a Citrix Bleed vulnerability exploited by the LockBit group, which we also discussed above. Although patches for this vulnerability were published a month earlier, at the time of the large-scale attack more than 10,000 publicly accessible servers remained vulnerable. This is what the LockBit ransomware took advantage of to breach the systems of several major companies, steal data, and encrypt files.

Among the big-name victims was Boeing, whose stolen data the attackers ended up publishing without waiting for the ransom to be paid. The ransomware also hit the Industrial and Commercial Bank of China (ICBC), the largest commercial bank in the world.

The incident badly hurt the Australian arm of DP World, a major UAE-based logistics company that operates dozens of ports and container terminals worldwide. The attack on DP World Australia’s IT systems massively disrupted its logistics operations, leaving some 30,000 containers stranded in Australian ports.

December 2023: ALPHV/BlackCat infrastructure seized by law enforcement

Toward the end of the year, a joint operation by the FBI, the U.S. Department of Justice, Europol, and law enforcement agencies of several European countries deprived the ALPHV/BlackCat ransomware group of control over its infrastructure. Having hacked it, they quietly observed the cybercriminals’ actions for several months, collecting data decryption keys and aiding BlackCat victims.

In this way, the agencies rid more than 500 organizations worldwide of the ransom threat and saved around $68 million in potential payouts. This was followed in December by a final takeover of the servers, putting an end to BlackCat’s operations.

Various statistics about the ransomware group’s operations were also made public. According to the FBI, during the two years of its activity, ALPHV/BlackCat breached more than a thousand organizations, demanded a total of more than $500 million from victims, and received around $300 million in ransom payments.

How to guard against ransomware attacks

Ransomware attacks are becoming more varied and sophisticated with each passing year, so there isn’t (and can’t be) one killer catch-all tip to prevent incidents. Defense measures must be comprehensive. Focus on the following tasks:

Train employees in cybersecurity awareness.
Implement and refine data storage and employee access
Back up important data regularly and isolate it from the network.
Install robust protection on all corporate devices.
Monitor suspicious activity on the corporate network using an Endpoint Detection and Response (EDR)
Outsource threat search and response to a specialist company if your in-house information security lacks the capability.

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