Virtual assets are digital representations of value that can be transferred, stored, or traded, such as certain cryptocurrencies, tokens, or other ledger-based instruments. In cyber security, they matter because they let attackers move proceeds quickly, across borders, and sometimes through multiple services before investigators can react. They are also a common target in wallet theft, phishing, exchange compromise, and ransomware payment flows.
Defenders care about virtual assets because they change how money is traced after an intrusion. Security teams, fraud analysts, and AML investigators may need to correlate blockchain activity, account logins, IP changes, and transaction timing to spot laundering or suspicious transfers. Controls such as wallet screening, transaction monitoring, travel-rule checks, and strong custody procedures help reduce risk. The term does not imply illegality: virtual assets are used in legitimate commerce as well, but their speed and portability make them useful to both attackers and defenders.