Quote:Malwarebytes is the latest discovered victim of the SolarWinds hackers, the security company said – except that it wasn’t targeted through the SolarWinds platform.
“While Malwarebytes does not use SolarWinds, we, like many other companies were recently targeted by the same threat actor,” it disclosed in a Tuesday web posting.
Instead of using the SolarWinds Orion network-management system, the advanced persistent threat (APT) abused “applications with privileged access to Microsoft Office 365 and Azure environments,” the security firm said — specifically, an email-protection application.
“What started out as the SolarWinds attack is slowly turning out to be perhaps the most sophisticated and wide-reaching cyber-campaign we have ever seen,” Ami Luttwak, CTO and co-founder of Wiz, said via email. “It encompasses multiple companies used as backdoors to other companies, numerous tools and novel attack methods. This is far more than SolarWinds.”
The Microsoft Security Response Center flagged suspicious activity from a third-party email-security application used with Malwarebytes’ Microsoft Office 365 hosted service on Dec. 15. The activity was visible in the application’s API calls. After that, the company and Microsoft kicked off an “extensive” investigation.
“A newly released CISA report reveals how threat actors may have obtained initial access by password guessing or password spraying in addition to exploiting administrative or service credentials,” according to Malwarebytes. “In our particular instance, the threat actor added a self-signed certificate with credentials to the service principal account. From there, they can authenticate using the key and make API calls to request emails via MSGraph.”
Read more: https://threatpost.com/malwarebytes-sola...rs/163190/
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