How were systems infected with upgraded to the latest version of Conficker (Conficker.D, Conficker.C or Downadup.C)?

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How were systems infected with upgraded to the latest version of Conficker (Conficker.D, Conficker.C or Downadup.C)?

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Unlike prior versions of Conficker (Conficker.A, Conficker.B, Conficker.C/Conficker.B++), systems infected with the latest version of Conficker (Conficker.D, Conficker.C or Downadup.C) are not infected by being attacked by other systems infected by Conficker. Systems with the latest version of Conficker (Conficker.D, Conficker.C or Downadup.C) were previously attacked and infected with Conficker.B. These already-compromised systems were then upgraded to the latest version of Conficker (Conficker.D, Conficker.C or Downadup.C).

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