Versions

20.5.0.28	0.74%
20.4.0.40	18.75%
20.3.1.22	8.46%
20.3.0.36	10.66%
20.2.1.22	8.82%
20.2.0.19	14.71%
20.1.0.24	1.10%
19.9.2.1	2.94%
19.9.1.14	5.51%
19.9.1.2	0.37%
19.9.0.9	12.87%
19.5.0.145	0.37%
19.1.0.28	1.47%
19.0.0.128	0.37%
18.8.0.5	1.10%
18.8.0.3	2.21%
18.7.2.3	6.62%
18.7.1.3	0.74%
18.6.0.29	0.37%
17.9.0.12	1.84%

There are 20 versions of ncw.dll in the wild, the latest version being 20.5.0.28. The average file size is about 3.19 MB. The file is a digitally signed and issued to Symantec Corporation by VeriSign. The programs Norton Internet Security, Norton 360 and Norton 360 Premier Edition have been observed as installing specific variations of ncw.dll.

Norton Internet Security, by Symantec Corporation, is a PC program that provides malware prevention and removal during subscription period and uses signatures and heuristics to identify viruses, trojans and other malware. Norton Internet Security features include a email spam filtering, personal firewall, and phishing protection.