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feat(filter): Add file/image path stem field #547

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Merged
rabbitstack merged 1 commit into from
Feb 11, 2026
Merged

feat(filter): Add file/image path stem field #547

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14 changes: 14 additions & 0 deletions pkg/filter/accessor_windows.go
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Original file line number Diff line number Diff line change
Expand Up @@ -673,6 +673,13 @@ func (l *fileAccessor) Get(f Field, e *event.Event) (params.Value, error) {
switch f.Name {
case fields.FilePath:
return e.GetParamAsString(params.FilePath), nil
case fields.FilePathStem:
path := e.GetParamAsString(params.FilePath)
n := strings.LastIndexByte(path, '.')
if n == -1 {
return path, nil
}
return path[:n], nil
case fields.FileName:
return filepath.Base(e.GetParamAsString(params.FilePath)), nil
case fields.FileExtension:
Expand Down Expand Up @@ -828,6 +835,13 @@ func (*moduleAccessor) Get(f Field, e *event.Event) (params.Value, error) {
switch f.Name {
case fields.ImagePath, fields.ModulePath, fields.DllPath:
return e.GetParamAsString(params.ImagePath), nil
case fields.ModulePathStem, fields.DllPathStem:
path := e.GetParamAsString(params.ImagePath)
n := strings.LastIndexByte(path, '.')
if n == -1 {
return path, nil
}
return path[:n], nil
case fields.ImageName, fields.ModuleName, fields.DllName:
return filepath.Base(e.GetParamAsString(params.ImagePath)), nil
case fields.ImageDefaultAddress, fields.ModuleDefaultAddress:
Expand Down
9 changes: 9 additions & 0 deletions pkg/filter/fields/fields_windows.go
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Original file line number Diff line number Diff line change
Expand Up @@ -447,6 +447,8 @@ const (
FileName Field = "file.name"
// FilePath represents the file full path (e.g. C:\Windows\System32\cmd.exe)
FilePath Field = "file.path"
// FilePathStem represents the full file path without extension (e.g. C:\Windows\System32\cmd)
FilePathStem Field = "file.path.stem"
// FileExtension represents the file extension (e.g. .exe or .dll)
FileExtension Field = "file.extension"
// FileOperation represents the file operation (e.g. create)
Expand Down Expand Up @@ -557,6 +559,8 @@ const (
DllSize Field = "dll.size"
// DllPath is the DLL full path
DllPath Field = "dll.path"
// DllPath is the DLL path stem field
DllPathStem Field = "dll.path.stem"
// DllName is the DLL name
DllName Field = "dll.name"
// DllPID is the pid of the process where the DLL was loaded
Expand Down Expand Up @@ -593,6 +597,8 @@ const (
ModuleDefaultAddress Field = "module.default_address"
// ModulePath is the module full path
ModulePath Field = "module.path"
// ModulePathStem is the module path stem field
ModulePathStem Field = "module.path.stem"
// ModuleName is the module name
ModuleName Field = "module.name"
// ModulePID is the pid of the process where the module was loaded
Expand Down Expand Up @@ -1124,6 +1130,7 @@ var fields = map[Field]FieldInfo{
ImageIsExecutable: {ImageIsExecutable, "indicates if the loaded image is an executable", params.Bool, []string{"image.is_exec'"}, &Deprecation{Since: "3.0.0", Fields: []Field{ModuleIsExecutable}}, nil},
ImageIsDotnet: {ImageIsDotnet, "indicates if the loaded image is a .NET assembly", params.Bool, []string{"image.is_dotnet'"}, &Deprecation{Since: "3.0.0", Fields: []Field{ModuleIsDotnet}}, nil},
ModulePath: {ModulePath, "full module path", params.UnicodeString, []string{"module.path = 'C:\\Windows\\System32\\advapi32.dll'"}, nil, nil},
ModulePathStem: {ModulePathStem, "module path stem", params.UnicodeString, []string{"module.path.stem = 'C:\\Windows\\System32\\advapi32'"}, nil, nil},
ModuleName: {ModuleName, "module name", params.UnicodeString, []string{"module.name = 'advapi32.dll'"}, nil, nil},
ModuleBase: {ModuleBase, "the base address of process in which the module is loaded", params.Address, []string{"module.base.address = 'a65d800000'"}, nil, nil},
ModuleChecksum: {ModuleChecksum, "module checksum", params.Uint32, []string{"module.checksum = 746424"}, nil, nil},
Expand All @@ -1146,6 +1153,7 @@ var fields = map[Field]FieldInfo{
ModuleIsExecutable: {ModuleIsExecutable, "indicates if the loaded module is an executable", params.Bool, []string{"module.is_exec'"}, nil, nil},
ModuleIsDotnet: {ModuleIsDotnet, "indicates if the loaded module is a .NET assembly", params.Bool, []string{"module.pe.is_dotnet'"}, nil, nil},
DllPath: {DllPath, "full dll path", params.UnicodeString, []string{"dll.path = 'C:\\Windows\\System32\\advapi32.dll'"}, nil, nil},
DllPathStem: {DllPathStem, "dll path stem", params.UnicodeString, []string{"dll.path.stem = 'C:\\Windows\\System32\\advapi32'"}, nil, nil},
DllName: {DllName, "module name", params.UnicodeString, []string{"dll.name = 'advapi32.dll'"}, nil, nil},
DllBase: {DllBase, "the base address of process in which the DLL is loaded", params.Address, []string{"dll.base = 'a65d800000'"}, nil, nil},
DllSize: {DllSize, "dll virtual mapped size", params.Uint32, []string{"dll.size > 1024"}, nil, nil},
Expand All @@ -1163,6 +1171,7 @@ var fields = map[Field]FieldInfo{

FileObject: {FileObject, "file object address", params.Uint64, []string{"file.object = 18446738026482168384"}, nil, nil},
FilePath: {FilePath, "full file path", params.UnicodeString, []string{"file.path = 'C:\\Windows\\System32'"}, nil, nil},
FilePathStem: {FilePathStem, "full file path without extension", params.UnicodeString, []string{"file.path.stem = 'C:\\Windows\\System32\\cmd'"}, nil, nil},
FileName: {FileName, "full file name", params.UnicodeString, []string{"file.name contains 'mimikatz'"}, nil, nil},
FileOperation: {FileOperation, "file operation", params.AnsiString, []string{"file.operation = 'open'"}, nil, nil},
FileShareMask: {FileShareMask, "file share mask", params.AnsiString, []string{"file.share.mask = 'rw-'"}, nil, nil},
Expand Down
3 changes: 3 additions & 0 deletions pkg/filter/filter_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -663,6 +663,7 @@ func TestFileFilter(t *testing.T) {
{`file.path ifuzzy 'C:\\WINDOWS\\sYS\\32dll'`, true},
{`file.path fuzzy ('C:\\Windows\\system32\\kernel', 'C:\\Windows\\system32\\ser3ll')`, true},
{`file.path ifuzzynorm 'C:\\WINDOWS\\sÝS\\32dll'`, true},
{`file.path.stem = 'C:\\Windows\\system32\\user32'`, true},
{`base(file.path) = 'user32.dll'`, true},
{`ext(base(file.path)) = '.dll'`, true},
{`base(file.path, false) = 'user32'`, true},
Expand Down Expand Up @@ -1014,6 +1015,8 @@ func TestModuleFilter(t *testing.T) {
{`module.signature.issuer icontains 'Microsoft Windows'`, true},
{`module.signature.subject icontains 'Microsoft Corporation'`, true},
{`module.pe.is_dotnet`, false},
{`module.path.stem endswith 'System32\\kernel32'`, true},
{`dll.path.stem endswith 'System32\\kernel32'`, true},
{`dll.signature.type = 'EMBEDDED'`, true},
{`dll.signature.level = 'AUTHENTICODE'`, true},
{`dll.signature.exists`, true},
Expand Down
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