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Merge pull request #393 from emmanvg/391-ssdeep-hash-case 

resolve problem with SSDEEP use in hashing-algorithm-ov
master^2
Chris Lenk 2020-05-15 09:36:26 -04:00 committed by GitHub
parent 658e70bf04 b4dbc419f6
commit 33e07edf3b
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 51 additions and 17 deletions
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30
stix2/patterns.py
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@ -121,21 +121,21 @@ class BooleanConstant(_Constant):
_HASH_REGEX = {
"MD5": ("^[a-fA-F0-9]{32}$", "MD5"),
"MD6": ("^[a-fA-F0-9]{32}|[a-fA-F0-9]{40}|[a-fA-F0-9]{56}|[a-fA-F0-9]{64}|[a-fA-F0-9]{96}|[a-fA-F0-9]{128}$", "MD6"),
"RIPEMD160": ("^[a-fA-F0-9]{40}$", "RIPEMD-160"),
"SHA1": ("^[a-fA-F0-9]{40}$", "SHA-1"),
"SHA224": ("^[a-fA-F0-9]{56}$", "SHA-224"),
"SHA256": ("^[a-fA-F0-9]{64}$", "SHA-256"),
"SHA384": ("^[a-fA-F0-9]{96}$", "SHA-384"),
"SHA512": ("^[a-fA-F0-9]{128}$", "SHA-512"),
"SHA3224": ("^[a-fA-F0-9]{56}$", "SHA3-224"),
"SHA3256": ("^[a-fA-F0-9]{64}$", "SHA3-256"),
"SHA3384": ("^[a-fA-F0-9]{96}$", "SHA3-384"),
"SHA3512": ("^[a-fA-F0-9]{128}$", "SHA3-512"),
"SSDEEP": ("^[a-zA-Z0-9/+:.]{1,128}$", "ssdeep"),
"WHIRLPOOL": ("^[a-fA-F0-9]{128}$", "WHIRLPOOL"),
"TLSH": ("^[a-fA-F0-9]{70}$", "TLSH"),
"MD5": (r"^[a-fA-F0-9]{32}$", "MD5"),
"MD6": (r"^[a-fA-F0-9]{32}|[a-fA-F0-9]{40}|[a-fA-F0-9]{56}|[a-fA-F0-9]{64}|[a-fA-F0-9]{96}|[a-fA-F0-9]{128}$", "MD6"),
"RIPEMD160": (r"^[a-fA-F0-9]{40}$", "RIPEMD-160"),
"SHA1": (r"^[a-fA-F0-9]{40}$", "SHA-1"),
"SHA224": (r"^[a-fA-F0-9]{56}$", "SHA-224"),
"SHA256": (r"^[a-fA-F0-9]{64}$", "SHA-256"),
"SHA384": (r"^[a-fA-F0-9]{96}$", "SHA-384"),
"SHA512": (r"^[a-fA-F0-9]{128}$", "SHA-512"),
"SHA3224": (r"^[a-fA-F0-9]{56}$", "SHA3-224"),
"SHA3256": (r"^[a-fA-F0-9]{64}$", "SHA3-256"),
"SHA3384": (r"^[a-fA-F0-9]{96}$", "SHA3-384"),
"SHA3512": (r"^[a-fA-F0-9]{128}$", "SHA3-512"),
"SSDEEP": (r"^[a-zA-Z0-9/+:.]{1,128}$", "SSDEEP"),
"WHIRLPOOL": (r"^[a-fA-F0-9]{128}$", "WHIRLPOOL"),
"TLSH": (r"^[a-fA-F0-9]{70}$", "TLSH"),
}

4
stix2/properties.py
View File

@ -417,7 +417,7 @@ HASHES_REGEX = {
"SHA3256": (r"^[a-fA-F0-9]{64}$", "SHA3-256"),
"SHA3384": (r"^[a-fA-F0-9]{96}$", "SHA3-384"),
"SHA3512": (r"^[a-fA-F0-9]{128}$", "SHA3-512"),
"SSDEEP": (r"^[a-zA-Z0-9/+:.]{1,128}$", "ssdeep"),
"SSDEEP": (r"^[a-zA-Z0-9/+:.]{1,128}$", "SSDEEP"),
"WHIRLPOOL": (r"^[a-fA-F0-9]{128}$", "WHIRLPOOL"),
"TLSH": (r"^[a-fA-F0-9]{70}$", "TLSH"),
}
@ -431,6 +431,8 @@ class HashesProperty(DictionaryProperty):
key = k.upper().replace('-', '')
if key in HASHES_REGEX:
vocab_key = HASHES_REGEX[key][1]
if vocab_key == "SSDEEP" and self.spec_version == "2.0":
vocab_key = vocab_key.lower()
if not re.match(HASHES_REGEX[key][0], v):
raise ValueError("'{0}' is not a valid {1} hash".format(v, vocab_key))
if k != vocab_key:

16
stix2/test/v20/test_observed_data.py
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@ -714,6 +714,22 @@ def test_file_example():
assert f.decryption_key == "fred" # does the key have a format we can test for?
def test_file_ssdeep_example():
f = stix2.v20.File(
name="example.dll",
hashes={
"SHA-256": "ceafbfd424be2ca4a5f0402cae090dda2fb0526cf521b60b60077c0f622b285a",
"ssdeep": "96:gS/mFkCpXTWLr/PbKQHbr/S/mFkCpXTWLr/PbKQHbrB:Tu6SXTWGQHbeu6SXTWGQHbV",
},
size=1024,
)
assert f.name == "example.dll"
assert f.size == 1024
assert f.hashes["SHA-256"] == "ceafbfd424be2ca4a5f0402cae090dda2fb0526cf521b60b60077c0f622b285a"
assert f.hashes["ssdeep"] == "96:gS/mFkCpXTWLr/PbKQHbr/S/mFkCpXTWLr/PbKQHbrB:Tu6SXTWGQHbeu6SXTWGQHbV"
def test_file_example_with_NTFSExt():
f = stix2.v20.File(
name="abc.txt",

16
stix2/test/v21/test_observed_data.py
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@ -785,6 +785,22 @@ def test_file_example():
assert f.atime == dt.datetime(2016, 12, 21, 20, 0, 0, tzinfo=pytz.utc)
def test_file_ssdeep_example():
f = stix2.v21.File(
name="example.dll",
hashes={
"SHA-256": "ceafbfd424be2ca4a5f0402cae090dda2fb0526cf521b60b60077c0f622b285a",
"SSDEEP": "96:gS/mFkCpXTWLr/PbKQHbr/S/mFkCpXTWLr/PbKQHbrB:Tu6SXTWGQHbeu6SXTWGQHbV",
},
size=1024,
)
assert f.name == "example.dll"
assert f.size == 1024
assert f.hashes["SHA-256"] == "ceafbfd424be2ca4a5f0402cae090dda2fb0526cf521b60b60077c0f622b285a"
assert f.hashes["SSDEEP"] == "96:gS/mFkCpXTWLr/PbKQHbr/S/mFkCpXTWLr/PbKQHbrB:Tu6SXTWGQHbeu6SXTWGQHbV"
def test_file_example_with_NTFSExt():
f = stix2.v21.File(
name="abc.txt",

2
stix2/test/v21/test_pattern_expressions.py
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@ -518,7 +518,7 @@ def test_invalid_boolean_constant():
@pytest.mark.parametrize(
"hashtype, data", [
('MD5', 'zzz'),
('ssdeep', 'zzz=='),
('SSDEEP', 'zzz=='),
],
)
def test_invalid_hash_constant(hashtype, data):