As part of their reconnaissance, scammers often set up mailbox rules to hide or delete any emails they send from the compromised account. Instead, they monitor email and track activity in the company, to maximize the chances of executing a successful attack. Once the account has been compromised, hackers rarely launch an attack right away. Cybercriminals impersonate Microsoft - the world’s most impersonated brand, with 1 in 3 attacks impersonating the well-known company - and use social-engineering tactics to try to trick email recipients into visiting a phishing website and disclosing their login credentials. Office 365 account-takeover attacks begin with infiltration. Once the account is compromised, hackers monitor and track activity to learn how the company does business, the email signatures they use, and the way financial transactions are handled, so they can launch successful attacks, including harvesting additional login credentials for other accounts. More than 1.5 million malicious and spam emails were sent from the compromised accounts in one month! Click To Tweet Highlighted ThreatĪccount Takeover – Cybercriminals use brand impersonation, social engineering, and phishing to steal login credentials and access Office 365 accounts. Recent analysis of #AccountTakeover attacks found that 29 percent of organizations had their Office 365 accounts compromised. Here’s a closer look at account takeover and solutions to help detect and block attacks. With more than half of all global businesses already using Office 365 and adoption continuing to grow quickly, hackers have set their sights on taking over accounts because they serve as a gateway to an organization and its data - a lucrative payoff for the criminals. Attacks also come via web and business applications, including SMS. Brute-force attacks are also used to successfully takeover accounts because people use very simple passwords that are easy to guess and they don’t change them often enough. Hackers also use stolen passwords for personal emails and use access to that account to try to get access to business email. Due to the fact that people often use the same password for their different accounts, hackers were able to successfully reuse the stolen credentials and gain access to additional accounts. In some cases, hackers leveraged usernames and passwords acquired in previous data breaches. Hackers executed the account-takeover attacks using a variety of methods. More than 1.5 million malicious and spam emails were sent from the hacked Office 365 accounts in that one month! A recent analysis of account-takeover attacks targeted at Barracuda customers found that 29 percent of organizations had their Office 365 accounts compromised by hackers in March 2019. Protect your Office 365 accounts from pervasive attacks.īarracuda researchers have revealed a startling rise in account takeover, one of the fastest growing email security threats.
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