APT28 PhantomNetVoxel BeardShell Stego C2
Detects fake image files (BMP, GIF, JPEG, PNG, TIFF) used by the BeardShell backdoor for command and control communications. These files contain an encrypted payload and a size field that matches the file's total size, a technique used by APT28 in the Phantom Net Voxel campaign.
YARA
