Researchers published WannaCry ransomware decryption tool for older Windows (XP, 2003, 7). It uses bug in the Windows Crypto API which does not immediately erase private key. The application is crawling the computer memory, looking for the prime numbers which can divide the public key used for the encryption.
Google introduced behavior-based malware scanner to every Android device. It's part of the Google Play Service and scans installed apps and provides phone tracking in the case of theft.
Croatian CERT honeypot detected a new SMB worm which uses seven tools from the NSA hacking toolkit. It uses Tor based C&C server, currently only beaconing the server, and spreading using the SMB exploit.
Research by the Recorded Future and the Intrusiontruth group concludes that so-called APT3, widely believed to be a China-based threat actor, is directly connected to the Chinese Ministry of State Security (MSS).
Sophos discovered malware infecting Seagate NAS devices which turn them into Monero cryptocurrency miners. However, “This threat is not targeting the Seagate Central device specifically; however, the device has a design flaw that allows it to be compromised. Most all of these devices have already been infected by this threat.” https://www.sophos.com/en-us/medialibrary/PDFs/technical%20papers/Cryptomining-malware-on-NAS-servers.pdf?la=en
Wikileaks released another CIA malware spying framework. Called 'Athena', the program "provides remote beacon and loader capabilities on target computers running the Microsoft Windows operating system (from Windows XP to Windows 10)."
Maltrail is a malicious traffic detection system, utilizing publicly available lists containing malicious and generally suspicious trails, along with static trails compiled from various AV reports and custom user defined lists.