Malwarebytes Anti-Malware
Malwarebytes is a site dedicated to fighting malware. Malwarebytes has developed a variety of tools that can identify and remove malicious software from your computer. When your computer becomes infected, Malwarebytes can provide the needed assistance to remove the infection and restore the machine back to optimum performance. IDTP - this truly does remove the go.google.com browser hijacker and the antivirus and antispyware variants.

Virus.org: Malware scanning service
Welcome to the Virus.Org Malware scanning service, this service scans uploaded files with several common Anti-Virus tools to attempt to determine if the uploaded file is in fact some form of Malware.

Microsoft Malware Protection Center
The Microsoft Malware Protection Center (MMPC) provides world class antimalware research and response capabilities that support Microsoft's range of security products and services. With laboratories in multiple locations around the globe the MMPC is able to respond quickly and effectively to new malicious and potentially unwanted software threats wherever and whenever they arise.

Comodo Instant Malware Analysis - Automated Analysis System
If you have a suspicious file, please submit it online by using the form below. Once the file is submitted, COMODO Automated Analysis System will scan it and report back its findings.

A+ NovaShield Anti-Malware v2.5 - Free Trial (Version 3.0 coming soon....)
NovaShield Anti-Malware is a behavior-based, signature-less software solution for detection and remediation of malware. NovaShield runs on Windows XP, Vista and Windows 7. NovaShield Anti-Malware offers powerful protection for your PC against both known and unknown threats, including Botnets, Trojans, Keyloggers, Rootkits, Worms, and Spyware.

Malwarebytes Anti-Malware - Download the latest version of the offline database installer
You might not be able to update the virus definitions database. We suggest you click this link if you are having problems. i.e. a virus/malware is stopping you from downloading the latest update.

The Rogue Gallery - Malware Labs at Lavasoft
The Rogue Gallery is a resource dedicated to keeping computer users safe from rogue security software. By providing a comprehensive database of current rogue security applications, you have the ability to clearly see what programs are considered rogue – and avoid them.

The PC Tools Malware Research Center
PC Tools runs an active and highly-specialized research lab, known as the Malware Research Centre, which is devoted to researching and identifying new spyware and malware infections for inclusion into our comprehensive anti-spyware database, which forms the 'brains' behind Spyware Doctor.

Malware Research Group (MRG)
Malware Research Group is an independent internet security research organization with a worldwide network of affiliates. We focus on testing security applications in various scenarios, malware research and providing the latest news about new forms of malware and other information in the field of internet security.

FireEye Malware Intelligence Lab
Threat research, analysis, and mitigation.