Archive Helmet Icon Archive A Reconstructed © MegaSecurity Database

Back Orifice

Family Author(s) From Date Has Image
BO Bee One Client BeeOne
BO Bee One Client 1.3b3 BeeOne
BO Bee One Client 1.41 BeeOne
BO Plugins and Tools
Back Orifice 1.20 Russian The Cult of the Dead Cow
Back Orifice 1.20 patched The Cult of the Dead Cow
Back Orifice Facil 1.2
Back Orifice 2000 (BO2K) The Cult of the Dead Cow

This archive is an almost-complete reconstruction of the legendary Mega Security (also known as Kobayashi), a premier 90s-era "Trojan Database" where malware authors once showcased their work. After a decade offline, the site was brought back in August 2024 by its original creator, MasterRat, who authorized the Malware Gallery to host this modernized, searchable version of the collection. While the original site remains available for those seeking a nostalgic, old-school experience, we are proud to continue its legacy here. Full credit and thanks go to MasterRat and the retired Mega Security staff for their years of dedicated work in cataloging these historical samples.