The Microsoft Video ActiveX control contains a vulnerability that may allow a remote attacker to execute code on a vulnerable system. This vulnerability requires no user interaction and is being actively exploited. Rules to detect attacks targeting this vulnerability are included in this release and are identified with GID 1, SIDs 15588 through 15677.Detailed changelogs can be found here: http://www.snort.org/vrt/advisories/2009/07/07 /vrt-rules-2009-07-07.”]
Source: https://blog.talosintelligence.com/2009/07/microsoft-video-activex-control-rule.html