Kaspersky detected HEUR:Exploit.Multi.Desert.gen and how to relove it ?

[MountainC]

It seems that this Trojan deserted my IIS log files. The logs in event viewer shows like this:

 Object name: C:\inetpub\logs\LogFiles\W3SVC2\u_ex230210.log//data0016.
 Object type: N/A.
 Danger level: high.
 Certainty level: partial signature match.
 Detected object type: Trojan.
 Detected: HEUR:Exploit.Multi.Desert.gen.
 Task name: KS10.1 - On-Demand Scan.
 User name: SYSTEM.
 Computer name: localhost.
 Process: N/A.
 PID: 0.

 

How can I resolve this problem? And what causes this?