Event ID - 0

Port No0
Service NameW32.Gunsan
RFC Doc0
ProtocolTCP
DescriptionThis destructive, mass-mailing worm propagates via email using its built-in SMTP (Standard Mail Transfer Protocol) engine. It is deletes several antivirus and monitoring programs
Reference LinkW32.Gunsan
AttackSolution:

Removing autostart entries from registry
prevents the malware from executing during startup. This is also an
effective malware process termination procedure.
Open Registry Editor. Click Start>Run, type REGEDIT then hit the
enter key.
In the left panel, double click the following:
HKEY_LOCAL_MACHINE>Software>Microsoft>
Windows>CurrentVersion>RunServices
In the right panel, locate and delete the entry:
Explorer = %system%\explorer16.exe
*where %System% is the Windows system directory, which is usually
C:\Windows\System or C:\WINNT\System32.
Restart your computer.

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