Clop, a prolific ransomware gang, is credited with stealing data from at least 66 companies by exploiting a bug in a widely used corporate file transfer tool made by Cleo Software.
The cybercriminal organization on Tuesday listed some of the names of the companies it hacked on a leaked dark web site, which TechCrunch saw, but the companies did not respond to the organization's efforts to reach out to them. The organization said it would soon release the official name of the hacked company, presumably in an attempt to force the hackers to pay a ransom to prevent victims from releasing their stolen files.
This is the latest major hack by the Klopp gang in recent years, targeting file transfer tools used by companies to share large sensitive data sets over the internet. Several years ago, Klopp took credit for a hack that targeted hundreds of companies that relied on similar file transfer tools such as Accellion, GoAnywhere, and MOVEit.