(thanks to Oliver Beresford)
loadplugin ClamAV clamav.pm
full CLAMAV eval:check_clamav()
describe CLAMAV Clam AntiVirus detected something...
score CLAMAV 0.001
# Look for specific types of ClamAV detections
header __CLAMAV_PHISH X-Spam-Virus =~ /Yes.{1,30}Phishing/i
header __CLAMAV_PHISH_HEUR X-Spam-Virus =~ /Yes.{1,30}Phishing\.Heuristics\.Email/
header __CLAMAV_SANE X-Spam-Virus =~ /Yes.{1,30}Sanesecurity/i
header __CLAMAV_MBL X-Spam-Virus =~ /Yes.{1,30}MBL/
header __CLAMAV_MSRBL X-Spam-Virus =~ /Yes.{1,30}MSRBL/
# Give the above rules a very late priority so that they can see the output
# of previous rules - otherwise they don't work! Not sure what the correct
# priority should be but this seems to work...
priority __CLAMAV_PHISH 9999
priority __CLAMAV_PHISH_HEUR 9999
priority __CLAMAV_SANE 9999
priority __CLAMAV_MBL 9999
priority __CLAMAV_MSRBL 9999
# Work out what ClamAV detected and score accordingly
# ClamAV general signatures
meta CLAMAV_VIRUS (CLAMAV && !__CLAMAV_PHISH && !__CLAMAV_SANE && !__CLAMAV_MBL && !__CLAMAV_MSRBL)
describe CLAMAV_VIRUS Virus found by ClamAV default signatures
score CLAMAV_VIRUS 20.0
# ClamAV phishing signatures
meta CLAMAV_PHISH (CLAMAV && __CLAMAV_PHISH && !__CLAMAV_SANE && !__CLAMAV_PHISH_HEUR)
describe CLAMAV_PHISH Phishing email found by ClamAV default signatures
score CLAMAV_PHISH 10.0
# ClamAV phishing with heuristic engine (not signatures based, may lead to false positives)
# Available since ClamAV 0.91
meta CLAMAV_PHISH_HEUR (CLAMAV && __CLAMAV_PHISH_HEUR)
describe CLAMAV_PHISH_HEUR Phishing email found by ClamAV heuristic engine
score CLAMAV_PHISH_HEUR 2.0
# ClamAV SaneSecurity signatures from http://www.sanesecurity.com/clamav/
meta CLAMAV_SANE (CLAMAV && __CLAMAV_SANE)
describe CLAMAV_SANE SPAM found by ClamAV SaneSecurity signatures
score CLAMAV_SANE 7.5
# ClamAV MBL signatures from http://www.malware.com.br/
meta CLAMAV_MBL (CLAMAV && __CLAMAV_MBL)
describe CLAMAV_MBL Malware found by ClamAV MBL signatures
score CLAMAV_MBL 7.5
# ClamAV MSRBL signatures from http://www.msrbl.com/
meta CLAMAV_MSRBL (CLAMAV && __CLAMAV_MSRBL)
describe CLAMAV_MSRBL SPAM found by ClamAV MSRBL signatures
score CLAMAV_MSRBL 2.0