<s>
Clam	O
AntiVirus	B-Application
(	O
ClamAV	O
)	O
is	O
a	O
free	B-Application
software	I-Application
,	O
cross-platform	O
antimalware	B-Application
toolkit	I-Application
able	O
to	O
detect	O
many	O
types	O
of	O
malware	O
,	O
including	O
viruses	O
.	O
</s>
<s>
It	O
was	O
developed	O
for	O
Unix	B-Application
and	O
has	O
third	O
party	O
versions	O
available	O
for	O
AIX	B-Application
,	O
BSD	B-Operating_System
,	O
HP-UX	B-Application
,	O
Linux	B-Application
,	O
macOS	B-Application
,	O
OpenVMS	B-Operating_System
,	O
OSF	B-Operating_System
(	O
Tru64	B-Operating_System
)	O
and	O
Solaris	B-Application
.	O
</s>
<s>
As	O
of	O
version	O
0.97.5	O
,	O
ClamAV	O
builds	O
and	O
runs	O
on	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
One	O
of	O
its	O
main	O
uses	O
is	O
on	O
mail	B-Protocol
servers	I-Protocol
as	O
a	O
server-side	O
email	O
virus	B-Application
scanner	I-Application
.	O
</s>
<s>
Sourcefire	O
,	O
developer	O
of	O
intrusion	O
detection	O
products	O
and	O
the	O
owner	O
of	O
Snort	B-Language
,	O
announced	O
on	O
17	O
August	O
2007	O
that	O
it	O
had	O
acquired	O
the	O
trademarks	O
and	O
copyrights	O
to	O
ClamAV	O
from	O
five	O
key	O
developers	O
.	O
</s>
<s>
ClamAV	O
includes	O
a	O
command-line	O
scanner	O
,	O
automatic	O
database	O
updater	O
,	O
and	O
a	O
scalable	O
multi-threaded	O
daemon	B-Operating_System
running	O
on	O
an	O
anti-virus	B-Application
engine	O
from	O
a	O
shared	O
library	O
.	O
</s>
<s>
The	O
application	O
features	O
a	O
Milter	B-Application
interface	O
for	O
sent	O
mail	O
and	O
on-demand	O
scanning	O
.	O
</s>
<s>
ELF	O
and	O
Portable	O
Executable	O
(	O
PE	O
)	O
files	O
compressed	O
with	O
UPX	B-Language
,	O
FSG	O
,	O
Petite	O
,	O
NsPack	O
,	O
wwpack32	O
,	O
MEW	O
,	O
and	O
Upack	O
,	O
or	O
obfuscated	O
with	O
SUE	O
,	O
Y0da	O
Cryptor	O
.	O
</s>
<s>
Office	B-Operating_System
Open	I-Operating_System
XML	I-Operating_System
file	I-Operating_System
formats	I-Operating_System
,	O
HTML	B-Language
,	O
Rich	O
Text	O
Format	O
(	O
RTF	O
)	O
and	O
Portable	B-Application
Document	I-Application
Format	I-Application
(	O
PDF	B-Application
)	O
.	O
</s>
<s>
ClamAV	O
was	O
tested	O
against	O
other	O
antivirus	B-Application
products	O
on	O
Shadowserver	O
.	O
</s>
<s>
In	O
2011	O
,	O
Shadowserver	O
tested	O
over	O
25	O
million	O
samples	O
against	O
ClamAV	O
and	O
numerous	O
other	O
antivirus	B-Application
products	O
.	O
</s>
<s>
In	O
the	O
2008	O
AV-TEST	O
comparison	O
of	O
antivirus	B-Application
tools	O
,	O
ClamAV	O
scored	O
poorly	O
in	O
on-demand	O
detection	O
,	O
avoiding	O
false	O
positives	O
,	O
and	O
rootkit	O
detection	O
.	O
</s>
<s>
AhnLab	O
,	O
the	O
top	O
antivirus	B-Application
,	O
detected	O
80.28	O
%	O
.	O
</s>
<s>
In	O
2022	O
Splunk	B-General_Concept
conducted	O
an	O
efficacy	O
study	O
involving	O
~	O
400,000	O
malware	O
samples	O
sourced	O
from	O
MalwareBazaar	O
.	O
</s>
<s>
In	O
particular	O
,	O
some	O
phishing	O
emails	O
can	O
be	O
detected	O
using	O
antivirus	B-Application
techniques	O
.	O
</s>
<s>
ClamAV	O
is	O
available	O
for	O
Linux	B-Application
and	O
BSD-based	O
operating	B-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
On	O
Linux	B-Application
servers	O
ClamAV	O
can	O
be	O
run	O
in	O
daemon	B-Operating_System
mode	O
,	O
servicing	O
requests	O
to	O
scan	O
files	O
sent	O
from	O
other	O
processes	O
.	O
</s>
<s>
These	O
can	O
include	O
mail	O
exchange	O
programs	O
,	O
files	O
on	O
Samba	B-Language
shares	O
,	O
or	O
packets	O
of	O
data	O
passing	O
through	O
a	O
proxy	O
server	O
.	O
</s>
<s>
On	O
Linux	B-Application
and	O
BSD	B-Operating_System
desktops	O
ClamAV	O
provides	O
on-demand	O
scanning	O
of	O
individual	O
files	O
,	O
directories	O
or	O
the	O
whole	O
PC	O
.	O
</s>
<s>
macOS	B-Operating_System
Server	I-Operating_System
has	O
included	O
ClamAV	O
since	O
version	O
10.4	O
.	O
</s>
<s>
It	O
is	O
used	O
within	O
the	O
operating	B-General_Concept
system	I-General_Concept
's	O
email	O
service	O
.	O
</s>
<s>
A	O
paid-for	O
graphical	B-Application
user	I-Application
interface	I-Application
is	O
available	O
from	O
Canimaan	O
Software	O
Ltd	O
in	O
the	O
form	O
of	O
ClamXav	O
.	O
</s>
<s>
Additionally	O
,	O
Fink	B-Application
,	O
Homebrew	B-Application
and	O
MacPorts	B-Application
have	O
ported	O
ClamAV	O
.	O
</s>
<s>
Another	O
program	O
which	O
uses	O
the	O
ClamAV	O
engine	O
on	O
macOS	B-Application
,	O
is	O
Counteragent	O
.	O
</s>
<s>
Working	O
alongside	O
the	O
Eudora	B-Application
Internet	I-Application
Mail	I-Application
Server	I-Application
program	O
,	O
Counteragent	O
scans	O
emails	O
for	O
viruses	O
using	O
ClamAV	O
and	O
also	O
optionally	O
provides	O
spam	O
filtering	O
through	O
SpamAssassin	B-Language
.	O
</s>
<s>
ClamAV	O
for	O
OpenVMS	B-Operating_System
is	O
available	O
for	O
DEC	B-Device
Alpha	I-Device
and	O
Itanium	B-General_Concept
platforms	O
.	O
</s>
<s>
The	O
build	O
process	O
is	O
simple	O
and	O
provides	O
basic	O
functionality	O
,	O
including	O
library	O
,	O
the	O
clamscan	O
utility	O
,	O
the	O
clamd	O
daemon	B-Operating_System
,	O
and	O
freshclam	O
for	O
update	O
.	O
</s>
<s>
There	O
are	O
IA-32	B-Device
and	O
x64	B-Device
variants	O
of	O
ClamAV	O
available	O
for	O
Windows	O
;	O
additionally	O
,	O
Cisco	O
's	O
Immunet	B-Application
uses	O
ClamAV	O
as	O
its	O
engine	O
.	O
</s>
<s>
A	O
port	O
of	O
ClamAV	O
is	O
available	O
for	O
OS/2	B-Application
(	O
including	O
eComStation	B-Device
and	O
ArcaOS	B-Device
)	O
with	O
a	O
native	O
UI	O
written	O
in	O
REXX	B-Language
.	O
</s>
<s>
Since	O
ClamAV	O
does	O
not	O
include	O
a	O
graphical	B-Application
user	I-Application
interface	I-Application
(	O
GUI	B-Application
)	O
but	O
instead	O
is	O
run	O
from	O
the	O
command	O
line	O
,	O
a	O
number	O
of	O
third-party	O
developers	O
have	O
written	O
GUIs	B-Application
for	O
the	O
application	O
for	O
various	O
platforms	O
and	O
uses	O
.	O
</s>
<s>
KlamAV	B-Language
for	O
TDE	B-Application
(	O
development	O
of	O
the	O
original	O
KDE	B-Application
version	O
was	O
discontinued	O
in	O
2009	O
)	O
.	O
</s>
<s>
ClamXav	O
is	O
a	O
port	O
which	O
includes	O
a	O
graphical	B-Application
user	I-Application
interfaces	I-Application
and	O
has	O
a	O
"	O
sentry	O
"	O
service	O
which	O
can	O
watch	O
for	O
changes	O
or	O
new	O
files	O
in	O
many	O
cases	O
.	O
</s>
<s>
There	O
is	O
also	O
an	O
update	O
and	O
scanning	O
scheduler	O
through	O
a	O
cron	B-General_Concept
job	I-General_Concept
facilitated	O
by	O
the	O
graphical	B-Application
interface	I-Application
.	O
</s>
<s>
ClamXav	O
can	O
detect	O
malware	O
specific	O
to	O
macOS	B-Application
,	O
Unix	B-Application
,	O
or	O
Windows	O
.	O
</s>
<s>
Tiger	O
Cache	O
Cleaner	O
is	O
shareware	B-License
software	O
which	O
installs	O
and	O
presents	O
a	O
graphic	B-Application
interface	I-Application
for	O
using	O
ClamAV	O
to	O
scan	O
for	O
viruses	O
,	O
and	O
provides	O
other	O
unrelated	O
functions	O
.	O
</s>
<s>
ClamWin	B-Language
is	O
a	O
graphical	B-Application
user	I-Application
interface	I-Application
front-end	O
ClamWin	B-Language
Pty	O
Ltd	O
.	O
developed	O
for	O
ClamAV	O
on	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
Features	O
include	O
on-demand	O
(	O
user-started	O
)	O
scanning	O
,	O
automatic	O
updates	O
,	O
scheduled	O
scanning	O
,	O
and	O
integration	O
with	O
File	B-Protocol
Explorer	I-Protocol
and	O
Microsoft	B-Application
Outlook	I-Application
.	O
</s>
<s>
ClamWin	B-Language
does	O
not	O
provide	O
on-access	O
scanning	O
.	O
</s>
<s>
A	O
Firefox	B-Operating_System
add-on	I-Operating_System
enables	O
ClamWin	B-Language
to	O
scan	O
downloaded	O
files	O
.	O
</s>
<s>
Several	O
other	O
extensions	O
allow	O
users	O
to	O
process	O
downloaded	O
files	O
with	O
any	O
software	O
and	O
scan	O
the	O
files	O
with	O
ClamWin	B-Language
.	O
</s>
<s>
On	O
Linux	B-Application
,	O
ClamAV	O
(	O
versions	O
0.99	O
and	O
later	O
)	O
supports	O
real-time	O
protection	O
via	O
the	O
Fanotify	O
add-on	B-Operating_System
for	O
the	O
Linux	B-Application
kernel	O
(	O
version	O
3.8	O
and	O
later	O
.	O
)	O
</s>
<s>
Alternatively	O
,	O
one	O
could	O
use	O
ClamFS	O
(	O
for	O
any	O
Unix-like	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
supporting	O
FUSE	B-Application
)	O
.	O
</s>
<s>
On	O
Microsoft	B-Application
Windows	I-Application
,	O
a	O
free	O
,	O
open-source	O
app	O
called	O
Clam	O
Sentinel	O
detects	O
file	O
changes	O
and	O
scans	O
modified	O
files	O
using	O
ClamWin	B-Language
.	O
</s>
<s>
Trend	O
Micro	O
claimed	O
that	O
Barracuda	O
's	O
utilization	O
of	O
ClamAV	O
infringes	O
on	O
a	O
software	O
patent	O
for	O
filtering	O
viruses	O
on	O
an	O
Internet	B-Application
gateway	I-Application
.	O
</s>
<s>
The	O
free	B-Application
software	I-Application
community	O
responded	O
in	O
part	O
by	O
calling	O
for	O
a	O
boycott	O
against	O
Trend	O
Micro	O
.	O
</s>
<s>
The	O
boycott	O
was	O
also	O
endorsed	O
by	O
the	B-Operating_System
Free	I-Operating_System
Software	I-Operating_System
Foundation	I-Operating_System
.	O
</s>
