yara(1)                     General Commands Manual                    yara(1)

NAME
       yara - find files matching patterns and rules written in a special-
       purpose language.

SYNOPSIS
       yara [OPTION]... [NAMESPACE:]RULES_FILE... FILE | DIR | PID

DESCRIPTION
       yara scans the given FILE, all files contained in directory DIR, or the
       process identified by PID looking for matches of patterns and rules
       provided in a special purpose-language. The rules are read from one or
       more RULES_FILE.

       The options to yara(1) are:

           --atom-quality-table
              Path to a file with the atom quality table.

       -C  --compiled-rules
              RULES_FILE contains rules already compiled with yarac.

       -c  --count
              Print number of matches only.

       -d  --define=identifier=value
              Define an external variable. This option can be used multiple
              times.

           --fail-on-warnings
              Treat warnings as errors. Has no effect if used with
              --no-warnings.

       -f  --fast-scan
              Speeds up scanning by searching only for the first occurrence of
              each pattern.

       -i identifier --identifier=identifier
              Print rules named identifier and ignore the rest. This option
              can be used multiple times.

           --max-process-memory-chunk=size
              While scanning process memory read data in chunks of the given
              size in bytes.

       -l number --max-rules=number
              Abort scanning after a number of rules matched.

           --max-strings-per-rule=number
              Set maximum number of strings per rule (default=10000)

       -x  --module-data=module=file
              Pass file's content as extra data to module. This option can be
              used multiple times.

       -n  --negate
              Print rules that doesn't apply (negate).

       -w  --no-warnings
              Disable warnings.

       -m  --print-meta
              Print metadata associated to the rule.

       -D  --print-module-data
              Print module data.

       -M  --module-names
              show module names

       -e  --print-namespace
              Print namespace associated to the rule.

       -S  --print-stats
              Print rules' statistics.

       -s  --print-strings
              Print strings found in the file.

       -L  --print-string-length
              Print length of strings found in the file.

       -X  --print-xor-key
              Print xor key of matched strings.

       -g  --print-tags
              Print the tags associated to the rule.

       -r  --recursive
              Scan files in directories recursively. It follows symlinks.

           --scan-list
              Scan files listed in FILE, one per line.

       -z size --skip-larger=size
              Skip files larger than the given size in bytes when scanning a
              directory.

       -k slots --stack-size=slots
              Set maximum stack size to the specified number of slots.

       -t tag --tag=tag
              Print rules tagged as tag and ignore the rest. This option can
              be used multiple times.

       -p number --threads=number
              Use the specified number of threads to scan a directory.

       -a seconds --timeout=seconds
              Abort scanning after a number of seconds has elapsed.

       -v  --version
              Show version information.

EXAMPLES
       $ yara /foo/bar/rules .

              Apply rules on /foo/bar/rules to all files on current directory.
              Subdirectories are not scanned.

       $ yara -t Packer -t Compiler /foo/bar/rules bazfile

              Apply rules on /foo/bar/rules to bazfile.  Only reports rules
              tagged as Packer or Compiler.

       $ cat /foo/bar/rules | yara -r /foo

              Scan all files in the /foo directory and its subdirectories.
              Rules are read from standard input.

       $ yara -d mybool=true -d myint=5 -d mystring="my string" /foo/bar/rules
       bazfile

              Defines three external variables mybool myint and mystring.

       $ yara -x cuckoo=cuckoo_json_report /foo/bar/rules bazfile

              Apply rules on /foo/bar/rules to bazfile while passing the
              content of cuckoo_json_report to the cuckoo module.


AUTHOR
       Victor M. Alvarez <plusvic@gmail.com>;<vmalvarez@virustotal.com>

Victor M. Alvarez             September 22, 2008                       yara(1)