Flame Malware used open source software to mislead security software.

This adds additional fuel to the already burning fire of the 'Flame Malware' (excuse the pun). Initial suspicions and investigations of the flame virus show sophisticated coding structure and functionality, typically the fruitful outcome of well-funded software development. Recent finds show that open source software had been used in an attempt for “evade” security mechanisms, and this should be very concerning for large enterprise organisations e.g. government agencies.

Additonal reading: http://www.itnews.com.au/News/315920,flame-malware-used-open-source-software.aspx