A breach of Deloitte’s email system, which may have exposed client details, emphasises the need for two-factor authentication and the monitoring of systems administrators.
Cyber attackers have reportedly compromised Deloitte’s global email server through an administrator’s account, giving them unrestricted access to emails and attachments.
The attackers may also have been able to access usernames, passwords, IP addresses, architectural diagrams for businesses and health information.
Deloitte’s auditing, tax consultancy and cyber security clients include banks, multinational media enterprises, pharmaceutical firms and government agencies.
Deloitte discovered the breach in March 2017, but it is believed the email system may have been compromised as early as October or November 2016, according to The Guardian.
The breach was regarded as so sensitive that reportedly only a handful of Deloitte’s most senior partners and lawyers were informed.
Deloitte is registered in London and its global headquarters is in New York. The breach is believed to have been US-focused.
The team investigating the breach has been reviewing potentially compromised documents for six months, but the attackers have yet to be identified, according to reports.