Scrabblous sends in this analysis of the Pushdo Trojan downloader's backend code and control server. Pushdo is a complex Trojan downloader that meticulously tracks its victims; much of its innovation is not in the Trojan itself but in its control infrastructure. Quoting: "The Pushdo controller also uses the GeoIP geolocation database in conjunction with whitelists and blacklists of country codes. This enables the Pushdo author to limit distribution of any one of the [421 different] malware loads from infecting users located in a particular country, or provides the ability to target a specific country or minority groups with a specific payload. Pushdo keeps track of the IP address of the victim, whether or not that person is an administrator on the computer, their primary hard drive serial number..., whether the filesystem is NTFS, how many times the victim system has executed a Pushdo variant, and the Windows OS version."

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