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meta_pe: fix rich header length check for hash calculation #50

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meta_pe: fix rich header length check for hash calculation #50

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meta_pe: fix rich header length check for hash calculation
knowmalware Sep 23, 2016
d99c819
Simplify rich header hash calculation with latest pefile.
knowmalware Sep 2, 2017
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24 changes: 12 additions & 12 deletions laikaboss/modules/meta_pe.py
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Original file line number Diff line number Diff line change
Expand Up @@ -244,7 +244,9 @@ def parseRich(self, pe):

result['Rich Header Values'] = data
result['Checksum'] = pe.RICH_HEADER.checksum
result['Hashes'] = self.richHeaderHashes(pe)
hashes = self.richHeaderHashes(pe)
if hashes:
result['Hashes'] = hashes

return result

Expand All @@ -253,17 +255,15 @@ def richHeaderHashes(pe):
"""
Returns hashes of the Rich PE header
"""
rich_data = pe.get_data(0x80, 0x80)
data = list(struct.unpack('<32I', rich_data))
checksum = data[1]
rich_end = data.index(0x68636952)
md5 = hashlib.md5()
sha1 = hashlib.sha1()
sha256 = hashlib.sha256()
for i in range(rich_end):
md5.update(struct.pack('<I', (data[i] ^ checksum)))
sha1.update(struct.pack('<I', (data[i] ^ checksum)))
sha256.update(struct.pack('<I', (data[i] ^ checksum)))
rich = pe.parse_rich_header()
if not rich:
return None
clear_data = rich.get('clear_data', None)
if not clear_data:
return None
md5 = hashlib.md5(clear_data)
sha1 = hashlib.sha1(clear_data)
sha256 = hashlib.sha256(clear_data)
data = {
'MD5': md5.hexdigest(),
'SHA1': sha1.hexdigest(),
Expand Down