Obliterate Trojan	Obsorb Trojan	Odelud
Oemji	Offensive	OfferAgent
Offline Keylogger 1.0	Offer Companion	Off Trojan
OhBaby Trojan	OH MaKeR	Olfeb
OICQ Search	Olourk	Omega
Omniquad Instant Remote Control	Onban	One of The last Trojans
Online Recorder 5.3	OnSrvr	OnWebMedia
Opasoft	OPC Back Orifice	Open Pass
OpenSite	Optimizer Trojan	Optimize Trojan
Optix	Optix Killer	Optserve
Orbit	Orbit 1.0	OrbitExplorer
Orcu	Orig	Orion
Ortyc Trojan	OSBodyGuard	Oscabot
Osiris	OsirisX KeyLogger	Osmo.2560
OUA_Exploit Trojan	Ourxin	OuterLimit Trojan
OutLaw	Outwar	Overload Trojan
OverSpy	Oxon 1.1	Oxtic