For an ongoing investigation not to be jeopardized, it is extremely important that all information related to those being investigated does not become public. When (cyber)criminals suspect they re being investigated, they become more careful. The gang behind Koobface are now destroying evidence and going further underground. They are covering their tracks in the cyber-world as we speak, and only God knows what else they are doing in the real world to protect the most valuable thing they have right now: their freedom.
Source: https://threatpost.com/was-koobface-expose-right-move-011912/76117/