Note that there's no common language, common religion, common ethnicity, common currency or market, or common communications infrastructure, one cannot help but come to the conclusion that the thing in common was the dictatorial regimes running them. A "bug" says Microsoft? Yeah, right.
I'd be looking very carefully at the certificates that Microsoft allow for those countries after this. This is probably some fairly simple hack that got noticed far too quickly, and now something a bit more invisible has been put in place.