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yara_test.py
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yara_test.py
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#!/usr/bin/env python
# Copyright (C) 2010-2015 Cuckoo Foundation.
# This file is part of Cuckoo Sandbox - http://www.cuckoosandbox.org
# See the file 'docs/LICENSE' for copying permission.
from __future__ import absolute_import, print_function
import logging
import os
import sys
try:
import yara
HAVE_YARA = True
except ImportError:
HAVE_YARA = False
log = logging.getLogger()
sys.path.append(os.path.join(os.path.abspath(os.path.dirname(__file__)), ".."))
from lib.cuckoo.common.config import Config
from lib.cuckoo.common.constants import CUCKOO_ROOT
from lib.cuckoo.common.objects import File
def init_yara():
"""Generates index for yara signatures."""
def find_signatures(root):
signatures = []
for entry in os.listdir(root):
if entry.endswith(".yara") or entry.endswith(".yar"):
signatures.append(os.path.join(root, entry))
return signatures
print("Initializing Yara...")
# Generate root directory for yara rules.
yara_root = os.path.join(CUCKOO_ROOT, "data", "yara")
# We divide yara rules in three categories.
# CAPE adds a fourth
categories = ["binaries", "memory", "CAPE"] # "urls"
generated = []
# Loop through all categories.
for category in categories:
# Check if there is a directory for the given category.
category_root = os.path.join(yara_root, category)
if not os.path.exists(category_root):
continue
# Check if the directory contains any rules.
signatures = []
for entry in os.listdir(category_root):
if entry.endswith(".yara") or entry.endswith(".yar"):
signatures.append(os.path.join(category_root, entry))
try:
compile_yara(os.path.join(category_root, entry))
except Exception as e:
print(os.path.join(category_root, entry), e)
if not signatures:
continue
# Generate path for the category's index file.
index_name = "index_{0}.yar".format(category)
index_path = os.path.join(yara_root, index_name)
# Create index file and populate it.
with open(index_path, "w") as index_handle:
for signature in signatures:
index_handle.write('include "{0}"\n'.format(signature))
generated.append(index_name)
for entry in generated:
if entry == generated[-1]:
print(("\t `-- {}", entry))
else:
print(("\t |-- {}", entry))
def compile_yara(rulepath=""):
"""Compile Yara signatures."""
if not HAVE_YARA:
if not File.notified_yara:
File.notified_yara = True
print("Unable to import yara (please compile from sources)")
return
if not os.path.exists(rulepath):
print(("The specified rule file at {} doesn't exist, skip", rulepath))
return
try:
rules = yara.compile(rulepath)
except Exception as e:
print("Unexpected error:", sys.exc_info()[0])
raise
if "duplicated identifier" in e.args[0]:
print("Duplicate rule in {}, rulepath")
print(e.args[0])
else:
print("ERROR: SyntaxError in rules: {}".format(e.args))
return
def test_yara():
print("About to attempt to compile yara rules...")
# Generate root directory for yara rules.
yara_root = os.path.join(CUCKOO_ROOT, "data", "yara")
# We divide yara rules in three categories.
# CAPE adds a fourth
categories = ["binaries", "urls", "memory", "CAPE"]
generated = []
# Loop through all categories.
for category in categories:
# Check if there is a directory for the given category.
category_root = os.path.join(yara_root, category)
if not os.path.exists(category_root):
continue
# Generate path for the category's index file.
index_name = "index_{0}.yar".format(category)
index_path = os.path.join(yara_root, index_name)
print(("Compiling {}", format(index_path)))
compile_yara(index_path)
def main():
os.chdir(CUCKOO_ROOT)
init_yara()
test_yara()
print("Complete")
if __name__ == "__main__":
cfg = Config()
try:
main()
except KeyboardInterrupt:
pass