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fix is_ordinal IndexError

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```
 Traceback (most recent call last):
   File "/opt/CAPE/utils/../lib/cuckoo/common/cape_utils.py", line 223, in flare_capa_details
     capabilities, counts = capa.main.find_capabilities(rules, extractor, disable_progress=True)
   File "/usr/local/lib/python2.7/dist-packages/capa/main.py", line 116, in find_capabilities
     function_matches, bb_matches, feature_count = find_function_capabilities(ruleset, extractor, f)
   File "/usr/local/lib/python2.7/dist-packages/capa/main.py", line 68, in find_function_capabilities
     for feature, va in extractor.extract_insn_features(f, bb, insn):
   File "/usr/local/lib/python2.7/dist-packages/capa/features/extractors/viv/__init__.py", line 84, in extract_insn_features
     for feature, va in capa.features.extractors.viv.insn.extract_features(f, bb, insn):
   File "/usr/local/lib/python2.7/dist-packages/capa/features/extractors/viv/insn.py", line 599, in extract_features
     for feature, va in insn_handler(f, bb, insn):
   File "/usr/local/lib/python2.7/dist-packages/capa/features/extractors/viv/insn.py", line 93, in extract_insn_api_features
     for name in capa.features.extractors.helpers.generate_symbols(dll, symbol):
   File "/usr/local/lib/python2.7/dist-packages/capa/features/extractors/helpers.py", line 61, in generate_symbols
     if not is_ordinal(symbol):
   File "/usr/local/lib/python2.7/dist-packages/capa/features/extractors/helpers.py", line 45, in is_ordinal
     return symbol[0] == "#"
 IndexError: string index out of range
```
This commit is contained in:
doomedraven
2020-12-08 09:50:00 +01:00
committed by GitHub
parent 9ce0c94e17
commit 64c71d8e6d
1 changed files with 3 additions and 1 deletions
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4
capa/features/extractors/helpers.py
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@@ -42,7 +42,9 @@ def is_ordinal(symbol):
"""
is the given symbol an ordinal that is prefixed by "#"?
"""
return symbol[0] == "#"
if symbol:
return symbol[0] == "#"
return False
def generate_symbols(dll, symbol):