Security Updates give the most recent protection content for Norton Internet Security, which protect networked critical systems and remote and mobile users from unwanted network intrusions and hackers, as well as from viruses, Trojans, and worms.

To download and install the Security Update 621 you need to run LiveUpdate feature of Norton Internet Security product. Please note that LiveUpdate definition identifier of Security Update 621 is 20120524.001 and its description was last modified on May 24, 2012 2:57:00 PM PDT.

Security Update 621 adds coverage for the following vulnerabilities and threats:

• System Infected: Festi Rootkit Activity:
  This IPS signature is designed to detect and block the network communications initiated by Festi rootkit to prevent the threat from receiving additional commands and further updates even when antivirus might not be able to detect the infection.
  
  
• Web Attack: Exploit Toolkit Website 8:
  This signature detect attempts to download exploits from a malicious toolkit which may compromise a computer through various vendor vulnerabilities.
  
  

Security Update 621 provides updated coverage for the following vulnerabilities and threats:

• Web Attack: Acrobat PDF Suspicious File Download:
  This signature detects downloads of Adobe PDF files containing malicious content.
  
  
• Web Attack: Blackhole Toolkit Website 3:
  This signature detects attempts to download exploits from Blackhole toolkit that may compromise a computer through various vendor vulnerabilities.
  
  
• Fake App Attack: Fake AV Website 21:
  A Web based attack relating to misleading applications has been blocked. No further action is required, but you may wish to update your virus definitions and run a full system scan as a precautionary measure.
  
  
• Web Attack: Malicious Exploit Kit Website 4:
  This signature detect attempts to download exploits from a malicious toolkit which may compromise a computer through various vendor vulnerabilities.
  
  
• Web Attack: Malicious JAR File Download 6:
  This signature detects attempts to download malicious JAR files.
  
  
• Web Attack: Malicious Toolkit Website 18:
  This signature detect attempts to download exploits from a malicious toolkit which may compromise a computer through various vendor vulnerabilities.
  
  
• Web Attack: Exploit Toolkit Website 5:
  This signature detect attempts to download exploits from a malicious toolkit which may compromise a computer through various vendor vulnerabilities.
  
  
• Web Attack: Facebook Fake Plugin 3:
  This signature will detect malicious web pages which are used for facebook likejacking attacks.
  
  

Security Update 621 removes coverage for the following vulnerabilities and threats:

• Web Attack: WPAD Spoofing:
  This signature detects HTTP requests for the wpad.dat file from malicious domains.