A financial institution's cybersecurity team noticed irregular activity involving unauthorized transactions originating from multiple compromised user accounts. Following their investigation, they discovered that these activities involved an organized crime group known for sophisticated cyber attacks. What indicators would most likely identify organized crime involvement?
Randomized scans and noisy network traffic without clear intent
An unsophisticated phishing attempt targeting random employees
A single compromised account with minimal unauthorized activity
Discovery of advanced malware and coordinated unauthorized transactions across multiple accounts