BSidesLV, Black Hat USA, and DEF CON kick off this week in Las Vegas, bringing together policymakers, executives, experts, hackers, and enthusiasts against a backdrop of some of the most unsettled international events of recent years.

The availability of supposedly hacked Chinese data on the dark web appears to have surged in recent weeks on the heels of the massive Shanghai National Police breach, which was one of the largest ever recorded.

Researchers with Censys, a firm that indexes devices connected to the internet, said Thursday they’ve found what appears to be a ransomware command and control network capable of launching attacks, including one host located in the U.S.

The delegation includes top cyber officials with Ukraine’s State Special Communications Service as well as Ukraine’s Prosecutor General’s Office, the Security Service of Ukraine, the Cyber Police, and the National Cybersecurity Coordination Center.

Ukrainian officials shared the information with the U.S. government, Cyber Command said, and then the agency uploaded various technical details to VirusTotal, Pastebin and GitHub. The agency did not attribute the malware.

The U.S. Justice Department seized roughly $500,000 in ransom payments that a medical center in Kansas paid to North Korean hackers last year, along with cryptocurrency used to launder the payments, Deputy Attorney General Lisa Monaco said Tuesday.

America’s Frontier Fund (AFF) will be a hub for what the CEO Gilman Louie calls the Quad Investor Network (QIN), a partnership that AFF will lead with other global democracies to invest jointly in emerging technology.

In a series of tweets in both English and Persian, the group — which calls itself Gonjeshke Darande or Predatory Sparrow — said the 19.76 GB cache was just the “first part” of what would be released.

A leading congressional voice on cybersecurity is seeking to amend the annual defense policy legislation to include cyber protections for the nation’s most vital critical infrastructure.

The group claiming responsibility for the attack told Databreaches.net that it stole roughly 20GB of data, which included credit card data and confidential details about guests and workers from an employee at the BWI Airport Marriott in Baltimore.