VirusTotal is a free service that analyzes suspicious files and URLs and facilitates the quick detection of viruses, worms, trojans, and all kinds of malware detected by the antivirus industry.
"Malware Hunter is a specialized Shodan crawler that explores the Internet looking for command & control (C2s) servers for botnets. It does this by pretending to be an infected client that's reporting back to a C2. Since we don't know where the C2s are located the crawler effectively reports back to every IP on the Internet as if the target IP is a C2. If the crawler gets a positive response from the IP then we know that it's a C2."
"Disclaimer: The following tool is provided as-is. It provides a simple scan for CVE-2014-0160 (also known as Heartbleed) on a public server. This scan is not accurate for every possible server configuration."
W3Spy.net is a free online service where you can gather information about every website currently registered on the internet. Our software compiles data from various sources in real-time and presents you with a comprehensive report. Using our service its completely free, and there is no daily lookup limit.