LOWData Breach
Global

New HollowGraph malware uses Microsoft Graph for stealthy C2 comms

·Source: BleepingComputer

Updated:

Executive Summary

A malicious component dubbed HollowGraph uses the calendar feature in compromised Microsoft 365 mailboxes as a command-and-control channel to receive attacker commands and exfiltrate stolen data. [...]

Analysis

A malicious component dubbed HollowGraph uses the calendar feature in compromised Microsoft 365 mailboxes as a command-and-control channel to receive attacker commands and exfiltrate stolen data. [...]
Source Attribution

Originally published by BleepingComputer on Jul 20, 2026.

Related Threats

HIGHData Breach

Data Breaches Announced by Four Hospitals and Surgery Centers

Data breaches have been reported by Wildwood Surgical Center, Michigan Surgical Center, Penobscot Valley Hospital, and Whitfield Regional Hospital. Wildwood […] The post Data Breaches Announced by Four Hospitals and Surgery Centers appeared first on The HIPAA Journal .

HIPAA Journal
HIGHData Breach

DentaQuest Data Breach Potentially Impacts Over 23 Million People

In May 2026, hackers stole personal and dental health information from DentaQuest’s computer network. The post DentaQuest Data Breach Potentially Impacts Over 23 Million People appeared first on SecurityWeek .

SecurityWeek
HIGHData Breach

How CISOs can rise to the business resilience challenge

CISOs have quietly become their organizations’ de facto chief resilience officers as the role has evolved from its primary prevention roots to now include greater emphasis on incident response and business resiliency and recovery. “Any experienced CISO who’s come up through the ranks of IT has that operational mindset, which is about uptime,” says John Bruggeman , consulting CISO to OnX and CBTS.

CSO Online