mirror of
https://github.com/mandiant/capa.git
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323 lines
11 KiB
Python
323 lines
11 KiB
Python
# Copyright (C) 2020 FireEye, Inc. All Rights Reserved.
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at: [package root]/LICENSE.txt
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# Unless required by applicable law or agreed to in writing, software distributed under the License
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# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and limitations under the License.
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import sys
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import textwrap
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import pytest
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from fixtures import *
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import capa.main
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import capa.rules
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import capa.engine
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import capa.features
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from capa.engine import *
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@pytest.mark.xfail(sys.version_info >= (3, 0), reason="vivsect only works on py2")
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def test_main(z9324d_extractor):
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# tests rules can be loaded successfully and all output modes
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path = z9324d_extractor.path
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assert capa.main.main([path, "-vv"]) == 0
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assert capa.main.main([path, "-v"]) == 0
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assert capa.main.main([path, "-j"]) == 0
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assert capa.main.main([path]) == 0
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@pytest.mark.xfail(sys.version_info >= (3, 0), reason="vivsect only works on py2")
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def test_main_single_rule(z9324d_extractor, tmpdir):
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# tests a single rule can be loaded successfully
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RULE_CONTENT = textwrap.dedent(
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"""
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rule:
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meta:
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name: test rule
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scope: file
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features:
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- string: test
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"""
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)
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path = z9324d_extractor.path
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rule_file = tmpdir.mkdir("capa").join("rule.yml")
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rule_file.write(RULE_CONTENT)
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assert (
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capa.main.main(
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[
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path,
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"-v",
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"-r",
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rule_file.strpath,
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]
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)
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== 0
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)
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@pytest.mark.xfail(sys.version_info >= (3, 0), reason="vivsect only works on py2")
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def test_main_shellcode(z499c2_extractor):
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path = z499c2_extractor.path
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assert capa.main.main([path, "-vv", "-f", "sc32"]) == 0
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assert capa.main.main([path, "-v", "-f", "sc32"]) == 0
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assert capa.main.main([path, "-j", "-f", "sc32"]) == 0
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assert capa.main.main([path, "-f", "sc32"]) == 0
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def test_ruleset():
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rules = capa.rules.RuleSet(
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[
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capa.rules.Rule.from_yaml(
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textwrap.dedent(
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"""
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rule:
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meta:
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name: file rule
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scope: file
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features:
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- characteristic: embedded pe
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"""
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)
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),
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capa.rules.Rule.from_yaml(
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textwrap.dedent(
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"""
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rule:
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meta:
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name: function rule
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scope: function
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features:
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- characteristic: tight loop
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"""
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)
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),
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capa.rules.Rule.from_yaml(
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textwrap.dedent(
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"""
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rule:
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meta:
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name: basic block rule
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scope: basic block
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features:
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- characteristic: nzxor
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"""
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)
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),
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]
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)
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assert len(rules.file_rules) == 1
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assert len(rules.function_rules) == 1
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assert len(rules.basic_block_rules) == 1
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@pytest.mark.xfail(sys.version_info >= (3, 0), reason="vivsect only works on py2")
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def test_match_across_scopes_file_function(z9324d_extractor):
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rules = capa.rules.RuleSet(
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[
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# this rule should match on a function (0x4073F0)
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capa.rules.Rule.from_yaml(
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textwrap.dedent(
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"""
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rule:
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meta:
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name: install service
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scope: function
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examples:
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- 9324d1a8ae37a36ae560c37448c9705a:0x4073F0
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features:
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- and:
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- api: advapi32.OpenSCManagerA
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- api: advapi32.CreateServiceA
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- api: advapi32.StartServiceA
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"""
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)
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),
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# this rule should match on a file feature
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capa.rules.Rule.from_yaml(
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textwrap.dedent(
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"""
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rule:
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meta:
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name: .text section
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scope: file
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examples:
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- 9324d1a8ae37a36ae560c37448c9705a
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features:
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- section: .text
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"""
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)
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),
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# this rule should match on earlier rule matches:
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# - install service, with function scope
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# - .text section, with file scope
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capa.rules.Rule.from_yaml(
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textwrap.dedent(
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"""
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rule:
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meta:
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name: .text section and install service
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scope: file
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examples:
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- 9324d1a8ae37a36ae560c37448c9705a
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features:
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- and:
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- match: install service
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- match: .text section
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"""
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)
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),
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]
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)
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capabilities, meta = capa.main.find_capabilities(rules, z9324d_extractor)
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assert "install service" in capabilities
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assert ".text section" in capabilities
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assert ".text section and install service" in capabilities
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@pytest.mark.xfail(sys.version_info >= (3, 0), reason="vivsect only works on py2")
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def test_match_across_scopes(z9324d_extractor):
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rules = capa.rules.RuleSet(
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[
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# this rule should match on a basic block (including at least 0x403685)
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capa.rules.Rule.from_yaml(
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textwrap.dedent(
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"""
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rule:
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meta:
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name: tight loop
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scope: basic block
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examples:
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- 9324d1a8ae37a36ae560c37448c9705a:0x403685
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features:
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- characteristic: tight loop
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"""
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)
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),
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# this rule should match on a function (0x403660)
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# based on API, as well as prior basic block rule match
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capa.rules.Rule.from_yaml(
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textwrap.dedent(
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"""
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rule:
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meta:
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name: kill thread loop
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scope: function
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examples:
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- 9324d1a8ae37a36ae560c37448c9705a:0x403660
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features:
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- and:
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- api: kernel32.TerminateThread
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- api: kernel32.CloseHandle
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- match: tight loop
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"""
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)
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),
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# this rule should match on a file feature and a prior function rule match
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capa.rules.Rule.from_yaml(
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textwrap.dedent(
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"""
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rule:
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meta:
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name: kill thread program
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scope: file
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examples:
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- 9324d1a8ae37a36ae560c37448c9705a
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features:
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- and:
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- section: .text
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- match: kill thread loop
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"""
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)
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),
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]
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)
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capabilities, meta = capa.main.find_capabilities(rules, z9324d_extractor)
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assert "tight loop" in capabilities
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assert "kill thread loop" in capabilities
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assert "kill thread program" in capabilities
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@pytest.mark.xfail(sys.version_info >= (3, 0), reason="vivsect only works on py2")
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def test_subscope_bb_rules(z9324d_extractor):
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rules = capa.rules.RuleSet(
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[
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capa.rules.Rule.from_yaml(
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textwrap.dedent(
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"""
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rule:
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meta:
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name: test rule
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scope: function
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features:
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- and:
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- basic block:
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- characteristic: tight loop
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"""
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)
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)
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]
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)
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# tight loop at 0x403685
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capabilities, meta = capa.main.find_capabilities(rules, z9324d_extractor)
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assert "test rule" in capabilities
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@pytest.mark.xfail(sys.version_info >= (3, 0), reason="vivsect only works on py2")
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def test_byte_matching(z9324d_extractor):
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rules = capa.rules.RuleSet(
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[
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capa.rules.Rule.from_yaml(
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textwrap.dedent(
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"""
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rule:
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meta:
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name: byte match test
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scope: function
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features:
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- and:
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- bytes: ED 24 9E F4 52 A9 07 47 55 8E E1 AB 30 8E 23 61
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"""
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)
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)
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]
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)
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capabilities, meta = capa.main.find_capabilities(rules, z9324d_extractor)
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assert "byte match test" in capabilities
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@pytest.mark.xfail(sys.version_info >= (3, 0), reason="vivsect only works on py2")
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def test_count_bb(z9324d_extractor):
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rules = capa.rules.RuleSet(
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[
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capa.rules.Rule.from_yaml(
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textwrap.dedent(
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"""
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rule:
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meta:
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name: count bb
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namespace: test
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scope: function
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features:
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- and:
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- count(basic blocks): 1 or more
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"""
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)
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)
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]
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)
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capabilities, meta = capa.main.find_capabilities(rules, z9324d_extractor)
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assert "count bb" in capabilities
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@pytest.mark.xfail(sys.version_info >= (3, 0), reason="vivsect only works on py2")
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def test_fix262(pma16_01_extractor, capsys):
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# tests rules can be loaded successfully and all output modes
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path = pma16_01_extractor.path
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assert capa.main.main([path, "-vv", "-t", "send HTTP request", "-q"]) == 0
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std = capsys.readouterr()
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assert "HTTP/1.0" in std.out
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assert "www.practicalmalwareanalysis.com" not in std.out
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