Well, I must say I'm not impressed. Just downloaded the only virus scanner for BeOS and here's what it recognizes:
/boot/home/addons/BeRAV>berav ~/virus/*
RAV Antivirus for BeOS i386 8.1.001
Copyright (c) 1995-2000 GeCAD The Software Company. All rights reserved.
Free for home users!
Scan engine 8.3 for i386.
Last update: Sat Mar 3 16:56:27 2001
Scanning for 55759 malwares (viruses, trojans and worms).
*** Since the number of existing viruses grow radically, it is recommended ***
*** to update your product to keep good detection/cleaning capabilities. ***
*** So check out
http://www.gecad.ro/rav/ for updates! ***
/boot/home/virus/pif.fable.a Infected: I_Worm/PIF.Fable.A (exact)
/boot/home/virus/W95_Magistr.28672@mm
/boot/home/virus/W95_Hybris.worm.B Infected: I_Worm/Hybris.C
/boot/home/virus/W32_Nimda.E@mm
/boot/home/virus/W32_Nimda.A@mm
/boot/home/virus/W32_Klez.H@mm
/boot/home/virus/W32_Badtrans.B@mm
/boot/home/virus/W32-Aliz.A
/boot/home/virus/VBS_NetLog.a Infected: VBS/Netlog.A
/boot/home/virus/VBS-Stages.A.~ Infected: VBS/Stages.A (exact)
/boot/home/virus/Kak.htm Suspicious: I_Worm/Kak.A
/boot/home/virus/Kak.htm->(SCRIPT1) Infected: I_Worm/Kak.D
/boot/home/virus/KAK.HTM Infected: I_Worm/Kak.A
/boot/home/virus/Bt.dl~ Infected: Trojan/Backdoor.BO.ButtTrumpet
/boot/home/virus/Backdoor.Trojan.zip
/boot/h.../virus/Backdoor.SubSeven22.zip
/boot/home/virus/Abel.eex
Time: 0 second(s).
Files/second: 47
Objects scanned: 17. New objects: 17
Infected: 7. Different virus bodies: 7.
Files: 16. Directories: 0. Archives: 0. Packed: 0. Mail files: 0
Warnings: 8.
Not good, only 7 out of 16.