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ThreatExpert's Statistics for Worm:Win32/Agent.AB [Microsoft]:

Worm:Win32/Agent.AB [Microsoft] is also known as:
Threat AliasNumber of Incidents
P2P-Worm.Agent!sd5 [PC Tools]79
P2P-Worm.Win32.Agent.ag [Kaspersky Lab]79
W32.SillyP2P [Symantec]79
WORM_SILLY.CZ [Trend Micro]79
W32/Generic.worm.b [McAfee]72
Generic.dx [McAfee]7
Mal/Packer [Sophos]6
P2P-Worm.Win32.Agent.ag [Ikarus]3
Win32/Agent.worm.64052 [AhnLab]3
Mal/NafBot-A [Sophos]1

Worm:Win32/Agent.AB [Microsoft] has the following possible country of origin:
OriginNumber of Incidents
Italy7