Function TestSimpleSequenceDeadline

pkg/rules/sequence_test.go:469–537

(t *testing.T)

}

func TestSimpleSequenceDeadline(t *testing.T) {
	log.SetLevel(log.DebugLevel)

	c := &config.FilterConfig{Name: "Command shell created a temp file"}
	f := filter.New(`
	sequence
	maxspan 100ms
  	|evt.name = 'CreateProcess' and ps.name = 'cmd.exe'| by ps.exe
  	|evt.name = 'CreateFile' and file.path icontains 'temp'| by file.path
	`, &config.Config{EventSource: config.EventSourceConfig{EnableFileIOEvents: true}, Filters: &config.Filters{}})
	require.NoError(t, f.Compile())

	ss := newSequenceState(f, c, new(ps.SnapshotterMock))

	e1 := &event.Event{
		Type:      event.CreateProcess,
		Timestamp: time.Now(),
		Name:      "CreateProcess",
		Tid:       2484,
		PID:       859,
		PS: &pstypes.PS{
			Name: "cmd.exe",
			Exe:  "C:\\Windows\\system32\\svchost-temp.exe",
		},
		Params: event.Params{
			params.ProcessID: {Name: params.ProcessID, Type: params.Uint32, Value: uint32(4143)},
		},
		Metadata: map[event.MetadataKey]any{"foo": "bar", "fooz": "barzz"},
	}
	require.False(t, ss.runSequence(e1))

	e2 := &event.Event{
		Type:      event.CreateFile,
		Timestamp: time.Now().Add(time.Millisecond * 200),
		Name:      "CreateFile",
		Tid:       2484,
		PID:       859,
		Category:  event.File,
		PS: &pstypes.PS{
			Name: "cmd.exe",
			Exe:  "C:\\Windows\\system32\\svchost.exe",
		},
		Params: event.Params{
			params.FilePath: {Name: params.FilePath, Type: params.UnicodeString, Value: "C:\\Windows\\system32\\svchost-temp.exe"},
		},
		Metadata: map[event.MetadataKey]any{"foo": "bar", "fooz": "barzz"},
	}
	time.Sleep(time.Millisecond * 110)
	require.False(t, ss.runSequence(e2))

	require.Equal(t, sequenceInitialState, ss.currentState())
	assert.Len(t, ss.partials, 0)

	// now the state machine has transitioned
	// to the initial state, which means we should
	// be able to match the sequence if we reinsert
	// the events
	require.False(t, ss.runSequence(e1))