CrowdStrike says cybercriminals are attempting to install a new infostealer malware through fake fixes
Operation Endgame was 'the largest ever operation against botnets'
Dozens arrested globally and thousands sent warnings
Comes in the face of rising levels of ransomware
Hackers capitalised on differences between European and US payment systems
Executives first said hack was 'Just a small breach'
Tens of millions of pounds saved by NCF actions, according to spy chief
One seized laptop contained over 800,000 potential victim domain credentials