International authorities and a raft of private technology companies say they have disrupted a cybercrime “assembly line” that allowed crooks to collect millions of login credentials and steal more than $47 million in ransom payments and by other fraudulent means.
The crux of the operation was the simultaneous targeting of two unrelated tools that are widely used in various online scams. The first is Amadey, a malware-as-a-service platform for compromising devices and delivering malicious payloads for ransomware and other scams. Amadey has been observed in the wild since at least 2018 and was seen last year abusing GitHub as it collected system information from infected devices and installed customized payloads. The second tool was StealC, an infostealer-as-a-service platform that collects credentials, authentication cookies, cryptocurrency wallets, browser extensions, and files whose names match customer-defined patterns.
Severing a critical link in the cybercrime chain
Amadey and StealC are separate tools that are run independently of each other. Given their widespread use, however, many customers use both in their individual cybercrime activities. The tools also, it turns out, relied on some of the same underlying infrastructure to run. Microsoft said it made this determination after analyzing the tools using AI. This insight allowed Microsoft attorneys to seek an order disrupting both at the same time.
“This action goes after the cybercrime ‘assembly line,’ where coordinated tools drive ransomware, financial fraud, and disruptions to public services,” Microsoft said Wednesday. “Amadey and StealC are often used alongside each other: Amadey helps attackers gain access to devices, while StealC steals passwords and sensitive information. Together, they form a critical link in the chain.”