REVOKING THE TOKEN DIDN'T KILL THE BACKDOOR

Summary from the TLDR InfoSec newsletter

GraphWorm, an implant tied to the China-nexus group Webworm, uses a real OneDrive account over Microsoft Graph as a dead drop, and its "upgrade" task swaps all five hardcoded OAuth credentials for a spare account in one command, so token revocation only pauses it. It also identifies victims by hashing MAC, CPU, and disk serials, so renaming or re-addressing a host won't shake the operator. Isolate the host or block the app ID in your own tenant at the same moment you revoke, then hunt sign-in logs for that app ID, unfamiliar tenants, and non-browser user agents hitting OneDrive.