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EXPLANATION.md

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Interpreting Results

Proxycheck.io

  • Api Documentation at: https://proxycheck.io/api/
  • Will typically give a vanilla yes/no
    • May also give a type (e.g. "VPN", "SOCKS", etc)
    • May also give a port number to check

GetIPIntel.net

IP Quality Score

IPHub

  • API Documentation at: https://iphub.info/api
  • Returns a "block number", or connection type.
    • Block 0: Residential or unknown
    • Block 1: Non-residential (e.g. webhost / proxy / vpn )

Teoh.io

  • API Documentation at: https://ip.teoh.io/vpn-proxy-api
  • Returns a yes/no: Hosting, Proxy
  • Returns a risk factor (Low, Medium, High, etc)
  • Returns an ISP type ( isp, Hosting/Datacenter, etc )
  • Teoh has generously donated an API key to us

IPHunter

  • API Documentation at: https://www.iphunter.info/api
  • Provides an ISP Name
  • Returns a "block number", or connection type.
    • Block 0: Residential or unknown
    • Block 1: Non-residential (e.g. webhost / proxy / vpn )

NoFraud.co

Compute hosts

SORBS

  • DNSBL Documentation at: http://www.sorbs.net/general/using.shtml
  • The "Spam and Open Relay Blocking System"
  • SORBS blacklists a variety of spam sources.
  • The main results to be interested in are:
    • 127.0.0.2 (HTTP Proxy)
    • 127.0.0.2 (SOCKS Proxy)
    • 127.0.0.2 (Misc Proxy)
    • Other results may help determine if a host is compromised. Many spam sources are compromised hosts or open proxies.

Spamhaus

  • DNSBL Documentation at: https://www.spamhaus.org/zen/
  • Very similar to SORBS
  • Results will normally have a link to a report explaining why the IP is listed
  • Primarily interesting results are 127.0.0.2, and 127.0.0.4-7.
    • 127.0.0.4-7 can be a strong indicator of a compromised host, or a proxy. See the linked report for more information.
    • 127.0.0.2 indicates that a host is sending, or has sent spam email. Many spam sources are compromised hosts or open proxies.

DShield / internet storm center

  • API Documentation at: https://dshield.org/api/
    • This is a more advanced/experimental feed, and requires additional manual research
  • Attacks: Number of attacks originating from this IP
  • Threatfeeds: Threat feeds that this IP appears in, as well as the last time that this IP was seen.
    • Google the threat feed name for more information.
      • Many will allow a lookup of the IP in question

Hola

  • Confirmed Hola VPN Nodes
  • Hola nodes often look like residential / non-proxy connections
  • There are two detection methods, both are 100% accurate, and are evidence of a recent Hola node.
    • I am unable to publicly disclose my detection methods at this time, as this might encourage Hola to make changes to avoid detection
  • Results will indicate the last time that the IP was seen, and by which method.

Cache

  • As we have a finite amount of resources, most results are cached.
  • This will indicate a yes/no as to wether the results were cached, as well as when they were cached, and when they will expire.

Port Scan

  • NO SCANS ARE MADE FROM TOOLFORGE.
  • For performance reasons, this check is not enabled by default.
  • More information on ports can be found at: https://en.wikipedia.org/wiki/Port_scanner and https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers
    • The tool checks the most common 1221 proxy ports, and returns if they are open or not.
  • This is a fairly advanced feed technique that often requires experience in interperting this sort of result.
  • Common indicators:
    • 1723: VPN: Not 100% evidence of an open proxy in and of itself. Some residential users (myself included) run a VPN out of the home to connect to various resources (cameras, home automation, etc)
    • 1080, 8080: Often a proxy server
    • 25, 109. 110, 585, 587, 993: Often evidence of a mail server. Most residential ISP's dissalow this sort of server, and explicitly block it.
    • 53: DNS - Domain name server. This service translates domain names into IP addresses. Uncommon on residential connections.
    • 80, 443: Web servers. This should be uncommon on residential connections, but is becoming more common. Often times on residential connections, it is a router configuration page
    • 21: FTP: File Transfer Protocol, Commonly used to upload / download files from a host. Becoming less common with SFTP operating on port 22. Can be an indicator of a webhost with other factors, but is not uncommon on residential connections
    • 22: SSH / SFTP: Typically a remote commandline used to configure and control linux/unix boxes. Traffic can be tunneled over SSH just like with a VPN / Proxy, and this can be an indicator of a webhost with other factors (behavioral, and other indicators listed above).
  • Further investigation:
    • nmap can be helpful.
    • If you want to know what's running on a port, you can use:
      • nmap -sV -p (port number, range, or numbers - comma seperated) (IP)
      • e.g.: nmap -sV -p 1-1000,1080,8080,923 127.0.0.1
      • Googling the port number can also be helpful
  • Port scans alone are rarely useful evidence of an open proxy.
    • Commonly used to confirm theories based on behavioral evidence

Other useful tools

Addittions or errors

  • Everything above is based on my own personal experience, and may be completely wrong!