Removable Media Air-Gap Bridge Folders
Detects the creation of files within hidden folders on removable media that are designed to mimic the Windows Recycle Bin ($RECYCLE.BIN or $RECYCLE.BIN.USER). This technique is used by APT37's THUMBSBD and VIRUSTASK malware to stage malicious files (.rb, .dat) for bridging air-gapped networks.
Microsoft Sentinel (KQL)
