How well do security packages protect themselves against threats? Already in 2014, AV-TEST examined each relevant security software package in terms of whether it used simple protection technologies such as DEP and ASLR. Now comes the follow-up test with 31 solutions, and even more sophisticated checks. Whereas some manufacturers perfectly maintain the additional protection, the latest result is a bitter moment of truth for other providers.
Norton / Symantec products did quite well.
https://www.av-test.org/en/news/news-single-view/check-2015-self-protection-of-antivirus-software/