Clamd.conf file for CentOS

##
## Example config file for the Clam AV daemon
## Please read the clamd.conf(5) manual before editing this file.
##

# Comment or remove the line below.
#Example

# Uncomment this option to enable logging.
# LogFile must be writable for the user running daemon.
# A full path is required.
# Default: disabled
LogFile /var/log/clamav/clamd.log

# By default the log file is locked for writing – the lock protects against
# running clamd multiple times (if want to run another clamd, please
# copy the configuration file, change the LogFile variable, and run
# the daemon with –config-file option).
# This option disables log file locking.
# Default: no
#LogFileUnlock yes

# Maximum size of the log file.
# Value of 0 disables the limit.
# You may use ‘M’ or ‘m’ for megabytes (1M = 1m = 1048576 bytes)
# and ‘K’ or ‘k’ for kilobytes (1K = 1k = 1024 bytes). To specify the size
# in bytes just don’t use modifiers. If LogFileMaxSize is enabled, log
# rotation (the LogRotate option) will always be enabled.
# Default: 1M
LogFileMaxSize 2M

# Log time with each message.
# Default: no
#LogTime yes

# Also log clean files. Useful in debugging but drastically increases the
# log size.
# Default: no
#LogClean yes

# Use system logger (can work together with LogFile).
# Default: no
LogSyslog yes

# Specify the type of syslog messages – please refer to ‘man syslog’
# for facility names.
# Default: LOG_LOCAL6
#LogFacility LOG_MAIL

# Enable verbose logging.
# Default: no
#LogVerbose yes

# Enable log rotation. Always enabled when LogFileMaxSize is enabled.
# Default: no
#LogRotate yes

# Log additional information about the infected file, such as its
# size and hash, together with the virus name.
#ExtendedDetectionInfo yes

# This option allows you to save a process identifier of the listening
# daemon (main thread).
# Default: disabled
PidFile /var/run/clamd.pid

# Optional path to the global temporary directory.
# Default: system specific (usually /tmp or /var/tmp).
#TemporaryDirectory /var/tmp

# Path to the database directory.
# Default: hardcoded (depends on installation options)
DatabaseDirectory /var/clamav

# Only load the official signatures published by the ClamAV project.
# Default: no
#OfficialDatabaseOnly no

# The daemon can work in local mode, network mode or both.
# Due to security reasons we recommend the local mode.

# Path to a local socket file the daemon will listen on.
# Default: disabled (must be specified by a user)
LocalSocket /tmp/clamd.socket

# Sets the group ownership on the unix socket.
# Default: disabled (the primary group of the user running clamd)
#LocalSocketGroup virusgroup

# Sets the permissions on the unix socket to the specified mode.
# Default: disabled (socket is world accessible)
#LocalSocketMode 660

# Remove stale socket after unclean shutdown.
# Default: yes
#FixStaleSocket yes

# TCP port address.
# Default: no
TCPSocket 3310

# TCP address.
# By default we bind to INADDR_ANY, probably not wise.
# Enable the following to provide some degree of protection
# from the outside world. This option can be specified multiple
# times if you want to listen on multiple IPs. IPv6 is now supported.
# Default: no
TCPAddr 127.0.0.1

# Maximum length the queue of pending connections may grow to.
# Default: 200
MaxConnectionQueueLength 30

# Clamd uses FTP-like protocol to receive data from remote clients.
# If you are using clamav-milter to balance load between remote clamd daemons
# on firewall servers you may need to tune the options below.

# Close the connection when the data size limit is exceeded.
# The value should match your MTA’s limit for a maximum attachment size.
# Default: 25M
StreamMaxLength 55M

# Limit port range.
# Default: 1024
#StreamMinPort 30000
# Default: 2048
#StreamMaxPort 32000

# Maximum number of threads running at the same time.
# Default: 10
MaxThreads 20

# Waiting for data from a client socket will timeout after this time (seconds).
# Default: 120
ReadTimeout 300

# This option specifies the time (in seconds) after which clamd should
# timeout if a client doesn’t provide any initial command after connecting.
# Default: 5
#CommandReadTimeout 5

# This option specifies how long to wait (in miliseconds) if the send buffer is full.
# Keep this value low to prevent clamd hanging
#
# Default: 500
#SendBufTimeout 200

# Maximum number of queued items (including those being processed by MaxThreads threads)
# It is recommended to have this value at least twice MaxThreads if possible.
# WARNING: you shouldn’t increase this too much to avoid running out of file descriptors,
# the following condition should hold:
# MaxThreads*MaxRecursion + (MaxQueue – MaxThreads) + 6< RLIMIT_NOFILE (usual max is 1024) # # Default: 100 #MaxQueue 200 # Waiting for a new job will timeout after this time (seconds). # Default: 30 #IdleTimeout 60 # Don't scan files and directories matching regex # This directive can be used multiple times # Default: scan all #ExcludePath ^/proc/ #ExcludePath ^/sys/ # Maximum depth directories are scanned at. # Default: 15 #MaxDirectoryRecursion 20 # Follow directory symlinks. # Default: no #FollowDirectorySymlinks yes # Follow regular file symlinks. # Default: no #FollowFileSymlinks yes # Scan files and directories on other filesystems. # Default: yes #CrossFilesystems yes # Perform a database check. # Default: 600 (10 min) #SelfCheck 600 # Execute a command when virus is found. In the command string %v will # be replaced with the virus name. # Default: no #VirusEvent /usr/local/bin/send_sms 123456789 "VIRUS ALERT: %v" # Run as another user (clamd must be started by root for this option to work) # Default: don't drop privileges User clamav # Initialize supplementary group access (clamd must be started by root). # Default: no AllowSupplementaryGroups no # Stop daemon when libclamav reports out of memory condition. #ExitOnOOM yes # Don't fork into background. # Default: no #Foreground yes # Enable debug messages in libclamav. # Default: no #Debug yes # Do not remove temporary files (for debug purposes). # Default: no #LeaveTemporaryFiles yes # Permit use of the ALLMATCHSCAN command. If set to no, clamd will reject # any ALLMATCHSCAN command as invalid. # Default: yes #AllowAllMatchScan no # Detect Possibly Unwanted Applications. # Default: no #DetectPUA yes # Exclude a specific PUA category. This directive can be used multiple times. # See https://github.com/vrtadmin/clamav-faq/blob/master/faq/faq-pua.md for # the complete list of PUA categories. # Default: Load all categories (if DetectPUA is activated) #ExcludePUA NetTool #ExcludePUA PWTool # Only include a specific PUA category. This directive can be used multiple # times. # Default: Load all categories (if DetectPUA is activated) #IncludePUA Spy #IncludePUA Scanner #IncludePUA RAT # In some cases (eg. complex malware, exploits in graphic files, and others), # ClamAV uses special algorithms to provide accurate detection. This option # controls the algorithmic detection. # Default: yes #AlgorithmicDetection yes # This option causes memory or nested map scans to dump the content to disk. # If you turn on this option, more data is written to disk and is available # when the LeaveTemporaryFiles option is enabled. #ForceToDisk yes # This option allows you to disable the caching feature of the engine. By # default, the engine will store an MD5 in a cache of any files that are # not flagged as virus or that hit limits checks. Disabling the cache will # have a negative performance impact on large scans. # Default: no #DisableCache yes ## ## Executable files ## # PE stands for Portable Executable - it's an executable file format used # in all 32 and 64-bit versions of Windows operating systems. This option allows # ClamAV to perform a deeper analysis of executable files and it's also # required for decompression of popular executable packers such as UPX, FSG, # and Petite. If you turn off this option, the original files will still be # scanned, but without additional processing. # Default: yes ScanPE yes # Certain PE files contain an authenticode signature. By default, we check # the signature chain in the PE file against a database of trusted and # revoked certificates if the file being scanned is marked as a virus. # If any certificate in the chain validates against any trusted root, but # does not match any revoked certificate, the file is marked as whitelisted. # If the file does match a revoked certificate, the file is marked as virus. # The following setting completely turns off authenticode verification. # Default: no #DisableCertCheck yes # Executable and Linking Format is a standard format for UN*X executables. # This option allows you to control the scanning of ELF files. # If you turn off this option, the original files will still be scanned, but # without additional processing. # Default: yes #ScanELF yes # With this option clamav will try to detect broken executables (both PE and # ELF) and mark them as Broken.Executable. # Default: no #DetectBrokenExecutables yes ## ## Documents ## # This option enables scanning of OLE2 files, such as Microsoft Office # documents and .msi files. # If you turn off this option, the original files will still be scanned, but # without additional processing. # Default: yes #ScanOLE2 yes # With this option enabled OLE2 files with VBA macros, which were not # detected by signatures will be marked as "Heuristics.OLE2.ContainsMacros". # Default: no #OLE2BlockMacros no # This option enables scanning within PDF files. # If you turn off this option, the original files will still be scanned, but # without decoding and additional processing. # Default: yes #ScanPDF yes # This option enables scanning within SWF files. # If you turn off this option, the original files will still be scanned, but # without decoding and additional processing. # Default: yes #ScanSWF yes ## ## Mail files ## # Enable internal e-mail scanner. # If you turn off this option, the original files will still be scanned, but # without parsing individual messages/attachments. # Default: yes ScanMail yes # Scan RFC1341 messages split over many emails. # You will need to periodically clean up $TemporaryDirectory/clamav-partial directory. # WARNING: This option may open your system to a DoS attack. # Never use it on loaded servers. # Default: no #ScanPartialMessages yes # With this option enabled ClamAV will try to detect phishing attempts by using # signatures. # Default: yes #PhishingSignatures yes # Scan URLs found in mails for phishing attempts using heuristics. # Default: yes #PhishingScanURLs yes # Always block SSL mismatches in URLs, even if the URL isn't in the database. # This can lead to false positives. # # Default: no #PhishingAlwaysBlockSSLMismatch no # Always block cloaked URLs, even if URL isn't in database. # This can lead to false positives. # # Default: no #PhishingAlwaysBlockCloak no # Detect partition intersections in raw disk images using heuristics. # Default: no #PartitionIntersection no # Allow heuristic match to take precedence. # When enabled, if a heuristic scan (such as phishingScan) detects # a possible virus/phish it will stop scan immediately. Recommended, saves CPU # scan-time. # When disabled, virus/phish detected by heuristic scans will be reported only at # the end of a scan. If an archive contains both a heuristically detected # virus/phish, and a real malware, the real malware will be reported # # Keep this disabled if you intend to handle "*.Heuristics.*" viruses # differently from "real" malware. # If a non-heuristically-detected virus (signature-based) is found first, # the scan is interrupted immediately, regardless of this config option. # # Default: no #HeuristicScanPrecedence yes ## ## Data Loss Prevention (DLP) ## # Enable the DLP module # Default: No #StructuredDataDetection yes # This option sets the lowest number of Credit Card numbers found in a file # to generate a detect. # Default: 3 #StructuredMinCreditCardCount 5 # This option sets the lowest number of Social Security Numbers found # in a file to generate a detect. # Default: 3 #StructuredMinSSNCount 5 # With this option enabled the DLP module will search for valid # SSNs formatted as xxx-yy-zzzz # Default: yes #StructuredSSNFormatNormal yes # With this option enabled the DLP module will search for valid # SSNs formatted as xxxyyzzzz # Default: no #StructuredSSNFormatStripped yes ## ## HTML ## # Perform HTML normalisation and decryption of MS Script Encoder code. # Default: yes # If you turn off this option, the original files will still be scanned, but # without additional processing. #ScanHTML yes ## ## Archives ## # ClamAV can scan within archives and compressed files. # If you turn off this option, the original files will still be scanned, but # without unpacking and additional processing. # Default: yes ScanArchive yes # Mark encrypted archives as viruses (Encrypted.Zip, Encrypted.RAR). # Default: no #ArchiveBlockEncrypted no ## ## Limits ## # The options below protect your system against Denial of Service attacks # using archive bombs. # This option sets the maximum amount of data to be scanned for each input file. # Archives and other containers are recursively extracted and scanned up to this # value. # Value of 0 disables the limit # Note: disabling this limit or setting it too high may result in severe damage # to the system. # Default: 100M #MaxScanSize 150M # Files larger than this limit won't be scanned. Affects the input file itself # as well as files contained inside it (when the input file is an archive, a # document or some other kind of container). # Value of 0 disables the limit. # Note: disabling this limit or setting it too high may result in severe damage # to the system. # Default: 25M #MaxFileSize 30M # Nested archives are scanned recursively, e.g. if a Zip archive contains a RAR # file, all files within it will also be scanned. This options specifies how # deeply the process should be continued. # Note: setting this limit too high may result in severe damage to the system. # Default: 16 #MaxRecursion 10 # Number of files to be scanned within an archive, a document, or any other # container file. # Value of 0 disables the limit. # Note: disabling this limit or setting it too high may result in severe damage # to the system. # Default: 10000 #MaxFiles 15000 # Maximum size of a file to check for embedded PE. Files larger than this value # will skip the additional analysis step. # Note: disabling this limit or setting it too high may result in severe damage # to the system. # Default: 10M #MaxEmbeddedPE 10M # Maximum size of a HTML file to normalize. HTML files larger than this value # will not be normalized or scanned. # Note: disabling this limit or setting it too high may result in severe damage # to the system. # Default: 10M #MaxHTMLNormalize 10M # Maximum size of a normalized HTML file to scan. HTML files larger than this # value after normalization will not be scanned. # Note: disabling this limit or setting it too high may result in severe damage # to the system. # Default: 2M #MaxHTMLNoTags 2M # Maximum size of a script file to normalize. Script content larger than this # value will not be normalized or scanned. # Note: disabling this limit or setting it too high may result in severe damage # to the system. # Default: 5M #MaxScriptNormalize 5M # Maximum size of a ZIP file to reanalyze type recognition. ZIP files larger # than this value will skip the step to potentially reanalyze as PE. # Note: disabling this limit or setting it too high may result in severe damage # to the system. # Default: 1M #MaxZipTypeRcg 1M # This option sets the maximum number of partitions of a raw disk image to be scanned. # Raw disk images with more partitions than this value will have up to the value number # partitions scanned. Negative values are not allowed. # Note: setting this limit too high may result in severe damage or impact performance. # Default: 50 #MaxPartitions 128 # This option sets the maximum number of icons within a PE to be scanned. # PE files with more icons than this value will have up to the value number icons scanned. # Negative values are not allowed. # WARNING: setting this limit too high may result in severe damage or impact performance. # Default: 100 #MaxIconsPE 200 ## ## On-access Scan Settings ## # Enable on-access scanning. Currently, this is supported via fanotify. # Clamuko/Dazuko support has been deprecated. # Default: no #ScanOnAccess yes # Don't scan files larger than OnAccessMaxFileSize # Value of 0 disables the limit. # Default: 5M #OnAccessMaxFileSize 10M # Set the include paths (all files inside them will be scanned). You can have # multiple OnAccessIncludePath directives but each directory must be added # in a separate line. (On-access scan only) # Default: disabled #OnAccessIncludePath /home #OnAccessIncludePath /students # Set the exclude paths. All subdirectories are also excluded. # (On-access scan only) # Default: disabled #OnAccessExcludePath /home/bofh # With this option you can whitelist specific UIDs. Processes with these UIDs # will be able to access all files. # This option can be used multiple times (one per line). # Default: disabled #OnAccessExcludeUID 0 ## ## Bytecode ## # With this option enabled ClamAV will load bytecode from the database. # It is highly recommended you keep this option on, otherwise you'll miss detections for many new viruses. # Default: yes #Bytecode yes # Set bytecode security level. # Possible values: # None - no security at all, meant for debugging. DO NOT USE THIS ON PRODUCTION SYSTEMS # This value is only available if clamav was built with --enable-debug! # TrustSigned - trust bytecode loaded from signed .c[lv]d files, # insert runtime safety checks for bytecode loaded from other sources # Paranoid - don't trust any bytecode, insert runtime checks for all # Recommended: TrustSigned, because bytecode in .cvd files already has these checks # Note that by default only signed bytecode is loaded, currently you can only # load unsigned bytecode in --enable-debug mode. # # Default: TrustSigned #BytecodeSecurity TrustSigned # Set bytecode timeout in miliseconds. # # Default: 5000 # BytecodeTimeout 1000 ## ## Statistics gathering and submitting ## # Enable statistical reporting. # Default: no #StatsEnabled yes # Disable submission of individual PE sections for files flagged as malware. # Default: no #StatsPEDisabled yes # HostID in the form of an UUID to use when submitting statistical information. # Default: auto #StatsHostID auto # Time in seconds to wait for the stats server to come back with a response # Default: 10 #StatsTimeout 10 [/bash]