Group-IB detailed HollowGraph, a Windows implant that uses the calendar of a compromised Microsoft 365 mailbox as a two-way dead drop rather than contacting an attacker-owned server. Authenticating to the Microsoft Graph API with hard-coded tenant, client, and secret values stored in a file named to look like a log, it reads tasking from attachments on calendar events buried at a date in 2050, and exfiltrates by creating its own far-future events with encrypted attachments. A separate DNS tunnel refreshes its credentials. Because the traffic is genuine Graph activity, there is no vulnerability to patch and network controls keyed to attacker infrastructure see nothing.
Researchers at Blackpoint Cyber detailed LabubaRAT, a previously undocumented Rust-based remote access trojan that disguises itself as NVIDIA software to blend into target systems. It arrives as an executable impersonating NVIDIA's container runtime, then profiles the host, identifying installed browsers and security products such as Microsoft Defender, CrowdStrike, and SentinelOne. From there it can run commands and scripts, capture screenshots, move files, and proxy traffic, and it communicates over multiple channels, including HTTPS, WebView2, and DNS tunneling, so access survives if one path is blocked. Its command server details are supplied at runtime, letting attackers reuse the same binary across campaigns, and there are signs it is sold as a service.
TrustStrike Labs