The malware FASTCash tampers with switch messages received from card issuers during a financial transaction, changing denials into approvals. The systems targeted often have misconfigurations preventing message authentication mechanisms from detecting tampered messages as fraudulent. The group responsible, BeagleBoyz, is a subset of North Korean-backed group HiddenCobra, which has attempted to steal nearly $2 billion since 2015 by disrupting critical banking systems.

Qantas begins alerting customers affected by cyber incident, including credit card, loyalty updates – Karryon
Summarize this content to a maximum of 60 words: Qantas begins alerting customers affected by cyber incident, including credit card, loyalty updates Karryon