Ransomware Attack on Ghanaian Financial Institution Encrypts 100TB of Data as Authorities Recover Millions in Linked Cybercrime Crackdown
A Ghanaian financial institution has suffered a major ransomware attack that encrypted approximately 100 terabytes of data, disrupted critical services, and resulted in the theft of around USD 120,000. The incident, disclosed as part of a broader regional cybercrime operation, highlights both the growing sophistication of ransomware attacks targeting African financial institutions and the increasing capability of local authorities to respond effectively.
The attack forms part of a wider cybercrime landscape uncovered during coordinated law enforcement operations across West Africa, which have led to hundreds of arrests and the recovery of millions of dollars.
Ransomware attack and immediate impact
The ransomware attack encrypted roughly 100 terabytes of operational and customer related data belonging to the financial institution, rendering key systems unavailable and disrupting essential banking services. Attackers also succeeded in exfiltrating approximately USD 120,000, underscoring the dual impact of modern ransomware operations that combine data encryption with direct financial theft.
Such a volume of encrypted data indicates deep penetration into backend systems rather than a limited endpoint level compromise.
Advanced malware analysis and data recovery
In response, Ghanaian authorities carried out advanced malware analysis to identify the specific ransomware strain used in the attack. This technical investigation enabled analysts to reverse engineer aspects of the malware and develop a custom decryption tool.
Using this tool, investigators were able to successfully recover nearly 30 terabytes of encrypted data, significantly reducing the operational and financial damage to the affected institution.
Identification of the ransomware strain
Authorities have confirmed that the ransomware variant was identified during forensic analysis, allowing defenders to understand its encryption routines, persistence mechanisms, and execution flow. This level of technical insight is notable in regional cybercrime responses and reflects a growing investment in local cyber defence capabilities.
The ability to create a functional decryptor also suggests weaknesses in the ransomware’s cryptographic implementation or key management.
Arrests linked to the ransomware case
Following the investigation, multiple suspects connected to the ransomware attack were arrested. Law enforcement actions targeted individuals believed to be involved in deployment, infrastructure management, and financial laundering activities linked to the attack.
Authorities have not disclosed whether additional arrests are expected, but investigations remain ongoing.
Operation Sentinel and wider cybercrime arrests
The ransomware incident was disclosed alongside the results of Operation Sentinel, a coordinated cybercrime enforcement effort across several African countries. During the operation, authorities in Benin alone made 106 arrests related to cyber enabled fraud and infrastructure abuse.
The operation reflects an increasingly regional approach to tackling cybercrime that frequently crosses national borders.
Dismantling of a major cyber-fraud network
Ghanaian authorities also dismantled a large cyber-fraud network operating across Ghana and Nigeria. The group used professionally designed websites and mobile applications to impersonate well-known fast-food brands, collecting online payments without delivering any goods.
The scheme defrauded more than 200 victims of over USD 400,000, demonstrating how cybercriminals increasingly combine technical sophistication with consumer facing deception.
Infrastructure takedown and seizures
As part of the fraud investigation, ten suspects were arrested in Ghana. Law enforcement seized more than 100 digital devices and took 30 fraudulent servers offline, significantly disrupting the group’s operational capability.
The infrastructure takedown is expected to have a lasting impact on similar fraud campaigns operating in the region.
Why this case matters
The Ghanaian ransomware case illustrates both the scale of cyber threats facing financial institutions and the tangible progress being made by African law enforcement in technical cyber investigations. Encrypting 100 terabytes of data places the incident among the most significant ransomware attacks reported in the region.
Equally significant is the successful recovery of data and the arrests that followed, showing that ransomware attacks do not always end with attackers walking away unchallenged.
Lessons for financial institutions
The attack reinforces the importance of offline backups, rapid incident response, and investment in malware analysis capabilities. Institutions operating in emerging markets face the same threat levels as global peers and must adopt comparable defensive postures.
Close collaboration with national cybercrime units can also prove decisive in limiting damage and pursuing attackers.
What happens next
Investigations into the ransomware attack and related fraud networks remain ongoing, with further arrests possible as authorities analyse seized devices and servers. The case is expected to inform future regional cybercrime operations and defensive strategies.
For the wider financial sector, the incident serves as a reminder that ransomware is a global threat, but also that coordinated technical and law enforcement responses can significantly reduce its impact.
