An attacker can use this to monitor different trojans running in different victim machines, rapidly running the appropriate client.
BackDoor-ATX [McAfee]security risk or a "backdoor" program [F-Prot]Trojan Horse [Panda]Trojan.Win32.VB.beTrojan.Win32.VB.be [Kaspersky]
trojan.win32.vb.be.exetrojanscanner.exe