The NCSC issue guidance on Ransomware
‘The NCSC are aware of a ransomware campaign relating to version 2 of the “WannaCry” malware affecting a wide range of organisations globally.
NCSC are working with affected organisations and partners to investigate and coordinate the response in the UK. This guidance will be updated as new information becomes available.
From investigations and analysis performed to date, we know that the malware encrypts files, provides the user with a prompt which includes; a ransom demand, a countdown timer and bitcoin wallet to pay the ransom into.
The malware uses the vulnerability MS17-010 to propagate through a network using the SMBv1 protocol. This enables the malware to infect additional devices connected to the same network.”