Trend Micro detected the Conficker E variant also known as WORM_DOWNAD.E on April 7, 2009.
Conficker E Characteristics
The Conficker E variant propagates itself through MS08-067 to external IPs if internet is available and uses local IPs if there is no connection. Other Conficker E Characteristics are as follows:
Conficker E is said to have an untrigger date [...]

Read More--Conficker E Detected on April 7