Improvements to Zeus

Zeus's development is active these days. Below is a table of release dates for each version:

2008/12/20 - 1.2.0.0
2008/12/30 - 1.2.1.0
2009/03/11 - 1.2.2.0
2009/03/28 - 1.2.3.0
2009/04/02 - 1.2.4.0

This change log entry states that during HTTP communication of the Trojan with the C&C server the User-Agent used will be that of system's Internet Explorer. Before, it was a constant string embedded in the binary, which could have raised suspicion or blocked by ISPs.