import datetime import pytest import stix2 def test_create_comparison_expression(): exp = stix2.EqualityComparisonExpression("file:hashes.'SHA-256'", stix2.HashConstant("aec070645fe53ee3b3763059376134f058cc337247c978add178b6ccdfb0019f", "SHA-256")) # noqa assert str(exp) == "file:hashes.'SHA-256' = 'aec070645fe53ee3b3763059376134f058cc337247c978add178b6ccdfb0019f'" def test_boolean_expression(): exp1 = stix2.MatchesComparisonExpression("email-message:from_ref.value", stix2.StringConstant(".+\\@example\\.com$")) exp2 = stix2.MatchesComparisonExpression("email-message:body_multipart[*].body_raw_ref.name", stix2.StringConstant("^Final Report.+\\.exe$")) exp = stix2.AndBooleanExpression([exp1, exp2]) assert str(exp) == "email-message:from_ref.value MATCHES '.+\\\\@example\\\\.com$' AND email-message:body_multipart[*].body_raw_ref.name MATCHES '^Final Report.+\\\\.exe$'" # noqa def test_boolean_expression_with_parentheses(): exp1 = stix2.MatchesComparisonExpression(stix2.ObjectPath("email-message", [stix2.ReferenceObjectPathComponent("from_ref"), stix2.BasicObjectPathComponent("value")]), stix2.StringConstant(".+\\@example\\.com$")) exp2 = stix2.MatchesComparisonExpression("email-message:body_multipart[*].body_raw_ref.name", stix2.StringConstant("^Final Report.+\\.exe$")) exp = stix2.ParentheticalExpression(stix2.AndBooleanExpression([exp1, exp2])) assert str(exp) == "(email-message:from_ref.value MATCHES '.+\\\\@example\\\\.com$' AND email-message:body_multipart[*].body_raw_ref.name MATCHES '^Final Report.+\\\\.exe$')" # noqa def test_hash_followed_by_registryKey_expression_python_constant(): hash_exp = stix2.EqualityComparisonExpression("file:hashes.MD5", stix2.HashConstant("79054025255fb1a26e4bc422aef54eb4", "MD5")) o_exp1 = stix2.ObservationExpression(hash_exp) reg_exp = stix2.EqualityComparisonExpression(stix2.ObjectPath("windows-registry-key", ["key"]), stix2.StringConstant("HKEY_LOCAL_MACHINE\\foo\\bar")) o_exp2 = stix2.ObservationExpression(reg_exp) fb_exp = stix2.FollowedByObservationExpression([o_exp1, o_exp2]) para_exp = stix2.ParentheticalExpression(fb_exp) qual_exp = stix2.WithinQualifier(300) exp = stix2.QualifiedObservationExpression(para_exp, qual_exp) assert str(exp) == "([file:hashes.MD5 = '79054025255fb1a26e4bc422aef54eb4'] FOLLOWEDBY [windows-registry-key:key = 'HKEY_LOCAL_MACHINE\\\\foo\\\\bar']) WITHIN 300 SECONDS" # noqa def test_hash_followed_by_registryKey_expression(): hash_exp = stix2.EqualityComparisonExpression("file:hashes.MD5", stix2.HashConstant("79054025255fb1a26e4bc422aef54eb4", "MD5")) o_exp1 = stix2.ObservationExpression(hash_exp) reg_exp = stix2.EqualityComparisonExpression(stix2.ObjectPath("windows-registry-key", ["key"]), stix2.StringConstant("HKEY_LOCAL_MACHINE\\foo\\bar")) o_exp2 = stix2.ObservationExpression(reg_exp) fb_exp = stix2.FollowedByObservationExpression([o_exp1, o_exp2]) para_exp = stix2.ParentheticalExpression(fb_exp) qual_exp = stix2.WithinQualifier(stix2.IntegerConstant(300)) exp = stix2.QualifiedObservationExpression(para_exp, qual_exp) assert str(exp) == "([file:hashes.MD5 = '79054025255fb1a26e4bc422aef54eb4'] FOLLOWEDBY [windows-registry-key:key = 'HKEY_LOCAL_MACHINE\\\\foo\\\\bar']) WITHIN 300 SECONDS" # noqa def test_file_observable_expression(): exp1 = stix2.EqualityComparisonExpression("file:hashes.'SHA-256'", stix2.HashConstant( "aec070645fe53ee3b3763059376134f058cc337247c978add178b6ccdfb0019f", 'SHA-256')) exp2 = stix2.EqualityComparisonExpression("file:mime_type", stix2.StringConstant("application/x-pdf")) bool_exp = stix2.AndBooleanExpression([exp1, exp2]) exp = stix2.ObservationExpression(bool_exp) assert str(exp) == "[file:hashes.'SHA-256' = 'aec070645fe53ee3b3763059376134f058cc337247c978add178b6ccdfb0019f' AND file:mime_type = 'application/x-pdf']" # noqa @pytest.mark.parametrize("observation_class, op", [ (stix2.AndObservationExpression, 'AND'), (stix2.OrObservationExpression, 'OR'), ]) def test_multiple_file_observable_expression(observation_class, op): exp1 = stix2.EqualityComparisonExpression("file:hashes.'SHA-256'", stix2.HashConstant( "bf07a7fbb825fc0aae7bf4a1177b2b31fcf8a3feeaf7092761e18c859ee52a9c", 'SHA-256')) exp2 = stix2.EqualityComparisonExpression("file:hashes.MD5", stix2.HashConstant("cead3f77f6cda6ec00f57d76c9a6879f", "MD5")) bool1_exp = stix2.OrBooleanExpression([exp1, exp2]) exp3 = stix2.EqualityComparisonExpression("file:hashes.'SHA-256'", stix2.HashConstant( "aec070645fe53ee3b3763059376134f058cc337247c978add178b6ccdfb0019f", 'SHA-256')) op1_exp = stix2.ObservationExpression(bool1_exp) op2_exp = stix2.ObservationExpression(exp3) exp = observation_class([op1_exp, op2_exp]) assert str(exp) == "[file:hashes.'SHA-256' = 'bf07a7fbb825fc0aae7bf4a1177b2b31fcf8a3feeaf7092761e18c859ee52a9c' OR file:hashes.MD5 = 'cead3f77f6cda6ec00f57d76c9a6879f'] {} [file:hashes.'SHA-256' = 'aec070645fe53ee3b3763059376134f058cc337247c978add178b6ccdfb0019f']".format(op) # noqa def test_root_types(): ast = stix2.ObservationExpression( stix2.AndBooleanExpression( [stix2.ParentheticalExpression( stix2.OrBooleanExpression([ stix2.EqualityComparisonExpression("a:b", stix2.StringConstant("1")), stix2.EqualityComparisonExpression("b:c", stix2.StringConstant("2"))])), stix2.EqualityComparisonExpression(u"b:d", stix2.StringConstant("3"))])) assert str(ast) == "[(a:b = '1' OR b:c = '2') AND b:d = '3']" def test_artifact_payload(): exp1 = stix2.EqualityComparisonExpression("artifact:mime_type", "application/vnd.tcpdump.pcap") exp2 = stix2.MatchesComparisonExpression("artifact:payload_bin", stix2.StringConstant("\\xd4\\xc3\\xb2\\xa1\\x02\\x00\\x04\\x00")) and_exp = stix2.AndBooleanExpression([exp1, exp2]) exp = stix2.ObservationExpression(and_exp) assert str(exp) == "[artifact:mime_type = 'application/vnd.tcpdump.pcap' AND artifact:payload_bin MATCHES '\\\\xd4\\\\xc3\\\\xb2\\\\xa1\\\\x02\\\\x00\\\\x04\\\\x00']" # noqa def test_greater_than_python_constant(): exp1 = stix2.GreaterThanComparisonExpression("file:extensions.windows-pebinary-ext.sections[*].entropy", 7.0) exp = stix2.ObservationExpression(exp1) assert str(exp) == "[file:extensions.windows-pebinary-ext.sections[*].entropy > 7.0]" def test_greater_than(): exp1 = stix2.GreaterThanComparisonExpression("file:extensions.windows-pebinary-ext.sections[*].entropy", stix2.FloatConstant(7.0)) exp = stix2.ObservationExpression(exp1) assert str(exp) == "[file:extensions.windows-pebinary-ext.sections[*].entropy > 7.0]" def test_less_than(): exp = stix2.LessThanComparisonExpression("file:size", 1024) assert str(exp) == "file:size < 1024" def test_greater_than_or_equal(): exp = stix2.GreaterThanEqualComparisonExpression("file:size", 1024) assert str(exp) == "file:size >= 1024" def test_less_than_or_equal(): exp = stix2.LessThanEqualComparisonExpression("file:size", 1024) assert str(exp) == "file:size <= 1024" def test_not(): exp = stix2.LessThanComparisonExpression("file:size", 1024, negated=True) assert str(exp) == "file:size NOT < 1024" def test_and_observable_expression(): exp1 = stix2.AndBooleanExpression([stix2.EqualityComparisonExpression("user-account:account_type", "unix"), stix2.EqualityComparisonExpression("user-account:user_id", stix2.StringConstant("1007")), stix2.EqualityComparisonExpression("user-account:account_login", "Peter")]) exp2 = stix2.AndBooleanExpression([stix2.EqualityComparisonExpression("user-account:account_type", "unix"), stix2.EqualityComparisonExpression("user-account:user_id", stix2.StringConstant("1008")), stix2.EqualityComparisonExpression("user-account:account_login", "Paul")]) exp3 = stix2.AndBooleanExpression([stix2.EqualityComparisonExpression("user-account:account_type", "unix"), stix2.EqualityComparisonExpression("user-account:user_id", stix2.StringConstant("1009")), stix2.EqualityComparisonExpression("user-account:account_login", "Mary")]) exp = stix2.AndObservationExpression([stix2.ObservationExpression(exp1), stix2.ObservationExpression(exp2), stix2.ObservationExpression(exp3)]) assert str(exp) == "[user-account:account_type = 'unix' AND user-account:user_id = '1007' AND user-account:account_login = 'Peter'] AND [user-account:account_type = 'unix' AND user-account:user_id = '1008' AND user-account:account_login = 'Paul'] AND [user-account:account_type = 'unix' AND user-account:user_id = '1009' AND user-account:account_login = 'Mary']" # noqa def test_invalid_and_observable_expression(): with pytest.raises(ValueError) as excinfo: stix2.AndBooleanExpression([stix2.EqualityComparisonExpression("user-account:display_name", "admin"), stix2.EqualityComparisonExpression("email-addr:display_name", stix2.StringConstant("admin"))]) assert "All operands to an 'AND' expression must have the same object type" in str(excinfo) def test_hex(): exp_and = stix2.AndBooleanExpression([stix2.EqualityComparisonExpression("file:mime_type", "image/bmp"), stix2.EqualityComparisonExpression("file:magic_number_hex", stix2.HexConstant("ffd8"))]) exp = stix2.ObservationExpression(exp_and) assert str(exp) == "[file:mime_type = 'image/bmp' AND file:magic_number_hex = h'ffd8']" def test_multiple_qualifiers(): exp_and = stix2.AndBooleanExpression([stix2.EqualityComparisonExpression("network-traffic:dst_ref.type", "domain-name"), stix2.EqualityComparisonExpression("network-traffic:dst_ref.value", "example.com")]) exp_ob = stix2.ObservationExpression(exp_and) qual_rep = stix2.RepeatQualifier(5) qual_within = stix2.WithinQualifier(stix2.IntegerConstant(1800)) exp = stix2.QualifiedObservationExpression(stix2.QualifiedObservationExpression(exp_ob, qual_rep), qual_within) assert str(exp) == "[network-traffic:dst_ref.type = 'domain-name' AND network-traffic:dst_ref.value = 'example.com'] REPEATS 5 TIMES WITHIN 1800 SECONDS" # noqa def test_set_op(): exp = stix2.ObservationExpression(stix2.IsSubsetComparisonExpression("network-traffic:dst_ref.value", "2001:0db8:dead:beef:0000:0000:0000:0000/64")) assert str(exp) == "[network-traffic:dst_ref.value ISSUBSET '2001:0db8:dead:beef:0000:0000:0000:0000/64']" def test_timestamp(): ts = stix2.TimestampConstant('2014-01-13T07:03:17Z') assert str(ts) == "t'2014-01-13T07:03:17Z'" def test_boolean(): exp = stix2.EqualityComparisonExpression("email-message:is_multipart", True) assert str(exp) == "email-message:is_multipart = true" def test_binary(): const = stix2.BinaryConstant("dGhpcyBpcyBhIHRlc3Q=") exp = stix2.EqualityComparisonExpression("artifact:payload_bin", const) assert str(exp) == "artifact:payload_bin = b'dGhpcyBpcyBhIHRlc3Q='" def test_list(): exp = stix2.InComparisonExpression("process:name", ['proccy', 'proximus', 'badproc']) assert str(exp) == "process:name IN ('proccy', 'proximus', 'badproc')" def test_list2(): # alternate way to construct an "IN" Comparison Expression exp = stix2.EqualityComparisonExpression("process:name", ['proccy', 'proximus', 'badproc']) assert str(exp) == "process:name IN ('proccy', 'proximus', 'badproc')" def test_invalid_constant_type(): with pytest.raises(ValueError) as excinfo: stix2.EqualityComparisonExpression("artifact:payload_bin", {'foo': 'bar'}) assert 'Unable to create a constant' in str(excinfo) def test_invalid_integer_constant(): with pytest.raises(ValueError) as excinfo: stix2.IntegerConstant('foo') assert 'must be an integer' in str(excinfo) def test_invalid_timestamp_constant(): with pytest.raises(ValueError) as excinfo: stix2.TimestampConstant('foo') assert 'must be a datetime object or timestamp string' in str(excinfo) def test_invalid_float_constant(): with pytest.raises(ValueError) as excinfo: stix2.FloatConstant('foo') assert 'must be a float' in str(excinfo) @pytest.mark.parametrize("data, result", [ (True, True), (False, False), ('True', True), ('False', False), ('true', True), ('false', False), ('t', True), ('f', False), ('T', True), ('F', False), (1, True), (0, False), ]) def test_boolean_constant(data, result): boolean = stix2.BooleanConstant(data) assert boolean.value == result def test_invalid_boolean_constant(): with pytest.raises(ValueError) as excinfo: stix2.BooleanConstant('foo') assert 'must be a boolean' in str(excinfo) @pytest.mark.parametrize("hashtype, data", [ ('MD5', 'zzz'), ('ssdeep', 'zzz=='), ]) def test_invalid_hash_constant(hashtype, data): with pytest.raises(ValueError) as excinfo: stix2.HashConstant(data, hashtype) assert 'is not a valid {} hash'.format(hashtype) in str(excinfo) def test_invalid_hex_constant(): with pytest.raises(ValueError) as excinfo: stix2.HexConstant('mm') assert "must contain an even number of hexadecimal characters" in str(excinfo) def test_invalid_binary_constant(): with pytest.raises(ValueError) as excinfo: stix2.BinaryConstant('foo') assert 'must contain a base64' in str(excinfo) def test_escape_quotes_and_backslashes(): exp = stix2.MatchesComparisonExpression("file:name", "^Final Report.+\\.exe$") assert str(exp) == "file:name MATCHES '^Final Report.+\\\\.exe$'" def test_like(): exp = stix2.LikeComparisonExpression("directory:path", "C:\\Windows\\%\\foo") assert str(exp) == "directory:path LIKE 'C:\\\\Windows\\\\%\\\\foo'" def test_issuperset(): exp = stix2.IsSupersetComparisonExpression("ipv4-addr:value", "198.51.100.0/24") assert str(exp) == "ipv4-addr:value ISSUPERSET '198.51.100.0/24'" def test_repeat_qualifier(): qual = stix2.RepeatQualifier(stix2.IntegerConstant(5)) assert str(qual) == 'REPEATS 5 TIMES' def test_invalid_repeat_qualifier(): with pytest.raises(ValueError) as excinfo: stix2.RepeatQualifier('foo') assert 'is not a valid argument for a Repeat Qualifier' in str(excinfo) def test_invalid_within_qualifier(): with pytest.raises(ValueError) as excinfo: stix2.WithinQualifier('foo') assert 'is not a valid argument for a Within Qualifier' in str(excinfo) def test_startstop_qualifier(): qual = stix2.StartStopQualifier(stix2.TimestampConstant('2016-06-01T00:00:00Z'), datetime.datetime(2017, 3, 12, 8, 30, 0)) assert str(qual) == "START t'2016-06-01T00:00:00Z' STOP t'2017-03-12T08:30:00Z'" qual2 = stix2.StartStopQualifier(datetime.date(2016, 6, 1), stix2.TimestampConstant('2016-07-01T00:00:00Z')) assert str(qual2) == "START t'2016-06-01T00:00:00Z' STOP t'2016-07-01T00:00:00Z'" def test_invalid_startstop_qualifier(): with pytest.raises(ValueError) as excinfo: stix2.StartStopQualifier('foo', stix2.TimestampConstant('2016-06-01T00:00:00Z')) assert 'is not a valid argument for a Start/Stop Qualifier' in str(excinfo) with pytest.raises(ValueError) as excinfo: stix2.StartStopQualifier(datetime.date(2016, 6, 1), 'foo') assert 'is not a valid argument for a Start/Stop Qualifier' in str(excinfo) def test_make_constant_already_a_constant(): str_const = stix2.StringConstant('Foo') result = stix2.patterns.make_constant(str_const) assert result is str_const