/etc/snort/rules/virus.rules is in snort-rules-default 2.9.7.0-5build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | # Copyright 2001-2005 Sourcefire, Inc. All Rights Reserved
#
# This file may contain proprietary rules that were created, tested and
# certified by Sourcefire, Inc. (the "VRT Certified Rules") as well as
# rules that were created by Sourcefire and other third parties and
# distributed under the GNU General Public License (the "GPL Rules"). The
# VRT Certified Rules contained in this file are the property of
# Sourcefire, Inc. Copyright 2005 Sourcefire, Inc. All Rights Reserved.
# The GPL Rules created by Sourcefire, Inc. are the property of
# Sourcefire, Inc. Copyright 2002-2005 Sourcefire, Inc. All Rights
# Reserved. All other GPL Rules are owned and copyrighted by their
# respective owners (please see www.snort.org/contributors for a list of
# owners and their respective copyrights). In order to determine what
# rules are VRT Certified Rules or GPL Rules, please refer to the VRT
# Certified Rules License Agreement.
#
#
# $Id: virus.rules,v 1.28.2.1.2.1 2005/05/16 22:17:52 mwatchinski Exp $
#------------
# VIRUS RULES
#------------
#
# We don't care about virus rules anymore. BUT, you people won't stop asking
# us for virus rules. So... here ya go.
#
# There is now one rule that looks for any of the following attachment types:
#
# ade, adp, asd, asf, asx, bat, chm, cli, cmd, com, cpp, diz, dll, dot, emf,
# eml, exe, hlp, hsq, hta, ini, js, jse, lnk, mda, mdb, mde, mdw, msi, msp,
# nws, ocx, pif, pl, pm, pot, pps, ppt, reg, rtf, scr, shs, swf, sys, vb,
# vbe, vbs, vcf, vxd, wmd, wmf, wms, wmz, wpd, wpm, wps, wpz, wsc, wsf, wsh,
# xlt, xlw
#
alert tcp $HOME_NET any -> $EXTERNAL_NET 25 (msg:"VIRUS OUTBOUND bad file attachment"; flow:to_server,established; content:"Content-Disposition|3A|"; nocase; pcre:"/filename\s*=\s*.*?\.(?=[abcdehijlmnoprsvwx])(a(d[ep]|s[dfx])|c([ho]m|li|md|pp)|d(iz|ll|ot)|e(m[fl]|xe)|h(lp|sq|ta)|jse?|m(d[abew]|s[ip])|p(p[st]|if|[lm]|ot)|r(eg|tf)|s(cr|[hy]s|wf)|v(b[es]?|cf|xd)|w(m[dfsz]|p[dmsz]|s[cfh])|xl[tw]|bat|ini|lnk|nws|ocx)[\x27\x22\n\r\s]/iR"; classtype:suspicious-filename-detect; sid:721; rev:8;)
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