10 Most Notable Cyber Attacks of 2023

The year 2023 bore witness to an unprecedented surge in ransomware attacks, marking it as a tumultuous period for cybersecurity. Extortion tactics became increasingly ruthless, with new trends like dual ransomware attacks posing formidable challenges for victim organizations striving to recover. This article dissects the 10 most notable and damaging ransomware attacks on U.S. organizations throughout the year, showcasing the evolving landscape of cyber threats and the efforts to combat them.

10 Most Notable Cyber Attacks of 2023

Ransomware Landscape Evolution

Cybersecurity companies reported historic highs in ransomware attacks, both on a monthly and yearly basis. The nature of the threat evolved beyond traditional data encryption, with attackers focusing more on data extortion threats to coerce victims into paying. This shift may have contributed to the surge, as the threat landscape witnessed an increase in callous extortion tactics.

Healthcare Sector Under Siege

Unsurprisingly, the healthcare sector found itself at the forefront of these attacks, constituting four out of the top 10 victim organizations. The rising trend of targeting healthcare institutions underscores the vulnerability of critical services and the need for robust cybersecurity measures in the industry.

Law Enforcement Wins and BlackCat Takedown

Amid the ransomware onslaught, law enforcement achieved notable victories. The Department of Justice, in a commendable move, announced the seizure of several websites belonging to the notorious Alphv/BlackCat ransomware gang. The FBI’s successful operation included the development of decryption tools to assist victims in their recovery efforts. However, experts caution that the group might rebrand, emphasizing the perpetual cat-and-mouse game between cybercriminals and law enforcement.

Chronicle of Notable Attacks

  1. Lehigh Valley Health Network (LVHN) Date: February 6 Impact: BlackCat ransomware attack affecting patient images for radiation oncology and sensitive information. LVHN refused to pay, leading to the release of nude photos of cancer patients in March.

  2. U.S. Marshals Service Date: February 17 Impact: Ransomware attack on sensitive law enforcement data, leading to disruptions for at least three months. No access to the Witness Protection Program was gained.

  3. Dish Network Date: February 23 Impact: Ransomware attack causing network outages and compromising data for over 290,000 individuals. Dish paid a ransom to prevent misuse of the acquired data.

  4. Western Digital Date: March 26 Impact: BlackCat ransomware group claims responsibility for data theft and disruption, leaking sensitive data, including footage from a video conference meeting.

  5. City of Dallas, Texas Date: May 3 Impact: Royal ransomware attack leading to significant network outages, with an $8.5 million budget approved for mitigation and recovery.

  6. Prospect Medical Holdings Date: July 31 – August 3 Impact: Rhysida ransomware attack affecting 16 hospitals, compromising patient data, including names, addresses, diagnoses, and in some cases, Social Security numbers.

  7. MGM Resorts Date: September 10 Impact: BlackCat operators gained access through a social engineering attack on the identity and access management vendor, leading to $100 million in losses.

  8. Boeing Date: October 27 Impact: LockBit ransomware listed Boeing on public data leak site, prompting investigations and potential data exposure. Losses and costs are still being assessed.

  9. Henry Schein Dates: October 14 and November 22 Impact: Dual ransomware attacks by BlackCat causing disruptions and compromising bank account and credit card information.

  10. Ardent Health Services Date: Thanksgiving Day Impact: Ongoing attack resulting in system outages, diverted ambulances, and temporary pausing of nonemergency procedures. Investigations are underway.


The year 2023 unfolded as a challenging chapter in the ongoing battle against ransomware. Despite the relentless attacks, law enforcement demonstrated resilience with successful operations against cybercriminals. The evolving tactics of ransomware groups, exemplified by dual attacks and increasingly callous extortion methods, call for a collective and proactive approach to cybersecurity. As organizations continue to fortify their defenses, the cybersecurity landscape remains dynamic, requiring constant vigilance and adaptation to thwart the ever-present threat of ransomware.

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