Add support for using the 'dotnet' module in YARA rules#749
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PeterMatula merged 11 commits intomasterfrom Apr 23, 2020
Merged
Add support for using the 'dotnet' module in YARA rules#749PeterMatula merged 11 commits intomasterfrom
PeterMatula merged 11 commits intomasterfrom
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s3rvac
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Apr 22, 2020
| // dotnet.user_strings[dotnet.number_of_user_strings - 8] == "{\x001\x001\x001\x001\x001\x00-\x002\x002\x002\x002\x002\x00-\x002\x000\x000\x000\x001\x00-\x000\x000\x000\x000\x001\x00}\x00\x00" and | ||
| // dotnet.user_strings[dotnet.number_of_user_strings - 6] == "{\x001\x001\x001\x001\x001\x00-\x002\x002\x002\x002\x002\x00-\x003\x000\x000\x000\x001\x00-\x000\x000\x000\x000\x001\x00}\x00\x00" and | ||
| // dotnet.user_strings[dotnet.number_of_user_strings - 4] == "{\x001\x001\x001\x001\x001\x00-\x002\x002\x002\x002\x002\x00-\x004\x000\x000\x000\x001\x00-\x000\x000\x000\x000\x001\x00}\x00\x00" and | ||
| // dotnet.user_strings[dotnet.number_of_user_strings - 2] == "{\x001\x001\x001\x001\x001\x00-\x002\x002\x002\x002\x002\x00-\x005\x000\x000\x000\x001\x00-\x000\x000\x000\x000\x001\x00}\x00\x00" |
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It seems that there is something wrong with the new YARA rule as the following two tests are failing:
tools.fileinfo.detection.packers.eziriz.EzirizDotnetTest_002 (sample_6.2.0.0_dotnet.exe_ --js[..]) [ FAIL ] (0.15s)
F
======================================================================
FAIL: test_fileinfo_json_output_is_correctly_parsed (tools.fileinfo.detection.packers.eziriz.EzirizDotnetTest_002)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/tcagent/work/c1867d72f67fc407/retdec-regression-tests/tools/fileinfo/detection/packers/eziriz/test.py", line 38, in test_fileinfo_json_output_is_correctly_parsed
self.assertEqual(self.fileinfo.output['tools'][0]['name'], 'Eziriz .NET Reactor')
AssertionError: 'Microsoft' != 'Eziriz .NET Reactor'
- Microsoft
+ Eziriz .NET Reactor
----------------------------------------------------------------------
Ran 1 test in 0.002s
FAILED (failures=1)
tools.fileinfo.detection.packers.eziriz.EzirizDotnetTest_002 (sample_6.2.9.2_dotnet.exe_ --js[..]) [ FAIL ] (0.16s)
F
======================================================================
FAIL: test_fileinfo_json_output_is_correctly_parsed (tools.fileinfo.detection.packers.eziriz.EzirizDotnetTest_002)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/tcagent/work/c1867d72f67fc407/retdec-regression-tests/tools/fileinfo/detection/packers/eziriz/test.py", line 38, in test_fileinfo_json_output_is_correctly_parsed
self.assertEqual(self.fileinfo.output['tools'][0]['name'], 'Eziriz .NET Reactor')
AssertionError: 'Microsoft' != 'Eziriz .NET Reactor'
- Microsoft
+ Eziriz .NET Reactor
----------------------------------------------------------------------
Ran 1 test in 0.003s
FAILED (failures=1)
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It is worse. I think YARA rule is hitting, but for some reason we filter it out. I run it with vanilla yara and the rule was found.
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@s3rvac, @ladislav-zezula, @metthal
Marek clarified some issues here. This new rule is fundamentally different from other existing rules and cpdetect (and maybe other tools) cannot deal with it. Other rules have strings to match. But this one gets detected, but there are no matches - cpdetect throws it away, This is what would be considered Heuristic rule and until now, we would hardcode it into a C++ source code. I will try to modify the toolchain to deal with it, but I don't know how hard it will be and how many issues I come accross.
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