Fixing conditions with multiple underscores and adding a working example for reference #41
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Adding the multi underscore rule
| @@ -8,8 +8,8 @@ import ( | |||
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| var ( | |||
| searchExprLexer = lexer.Must(lexer.Regexp(`(?P<Keyword>(?i)(1 of them)|(all of them)|(1 of)|(all of))` + | |||
| `|(?P<SearchIdentifierPattern>\*?[a-zA-Z_]+\*[a-zA-Z0-9_*]*)` + | |||
| `|(?P<SearchIdentifier>[a-zA-Z_][a-zA-Z0-9_]*)` + | |||
| `|(?P<SearchIdentifierPattern>\*?[a-zA-Z_]+(?:[a-zA-Z0-9_]*_)*[a-zA-Z0-9]*\*)` + // Adjusted pattern to catch multiple underscores which is present upstream | |||
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This regex is tricky and unfortunately what's allowed here isn't actually defined in the spec: it's referred to as {search-identifier-pattern} but never actually defined https://github.com/SigmaHQ/sigma-specification/blob/main/Sigma_specification.md#condition
We don't want to allow plain *, but other than that we could just say any string containing a * and another character [a-zA-Z0-9_] is a SearchIdentifierPattern?
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Interestingly, there are rules committed upstream that does support at least what's presented. Reading the rules more thoroughly, seems like there are possibilities for wildcards to be present anywhere in the string.
Matching is done with * wildcards (any number of characters) at arbitrary positions in the pattern.
So technically something like 1 of selection_*curl_* is allowed if I'm reading this correctly, which I don't think even the original pattern supports.
Also I added a new bash script that pulls ALL of the rules down, and verifies that the tests still run with all rules provided by SigmaHQ. For some reason just doing a regex that matched only what you suggested wasn't working as expected.
❯ go test
path ./testdata/
path testdata/TestMarshalRule-proc_creation_win_apt_chafer_mar18
path testdata/TestMarshalRule-proxy_apt40
path testdata/TestMarshalRule-zeek_smb_converted_win_susp_psexec
path testdata/TestParseConfig-sysmon
path testdata/TestParseRule-UpstreamSigmaRule
path testdata/TestParseRule-proc_creation_win_apt_chafer_mar18
path testdata/TestParseRule-proxy_apt40
path testdata/TestParseRule-zeek_smb_converted_win_susp_psexec
path testdata/UniqueCondition_00dd6763892aba9f2e493b6ef3f47523c45539e2bc64ded60fa72d9c67ed38b1.yml
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path testdata/UniqueCondition_fdae7d4fec8ddb71c8db9f237c7bba057327de594ce24a85b58bd990ccce1a4e.yml
path testdata/UniqueCondition_fe4c0f7c9ca1b3d63084f13442a47bcc3a597da34f325423856cabc0f0a6451a.yml
path testdata/UniqueCondition_fea1e7609f3e4e4cd31111923fa71b1fbf2f546473ad0c5cd1331a0f65c31a6a.yml
path testdata/UniqueCondition_ffb3bb4e44ae67dfc542d5853113ed5b6f7df48aa311e20ab055e4d5d2875cdb.yml
path testdata/UpstreamSigmaRule.rule.yml
path testdata/generate_upstream_condition.sh
path testdata/proc_creation_win_apt_chafer_mar18.rule.yml
path testdata/proxy_apt40.rule.yml
path testdata/sysmon.config.yml
path testdata/zeek_smb_converted_win_susp_psexec.rule.yml
PASS
ok github.com/bradleyjkemp/sigma-go 0.177s
This reverts commit 648e8ea29d51d6cb809116c4e801a95fde4317cf.
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Regex changes for multiple underscores
While testing the upstreams rules for SigmaHQ, conditions with multiple underscores failed the regex parser with
Upstream Rule
Specifically this condition from upstream
The following regex didn't properly catch when multiple underscores where used
|(?P<SearchIdentifierPattern>\*?[a-zA-Z_]+\*[a-zA-Z0-9_*]*)But this new one now allows for the match to have any number of underscores before defining the regex pattern.
Additional Example
Added an examples directory as the provided example in the README.md was a little vague with sigma.Evalutator (which didn't work for me), and changed it to a working example as well.
Unittests