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This is an example configuration of services-darenet sockcheck module.
<pre>
/* sockcheck.conf
 *
 * This file describes what proxy scans to run: what ports to connect
 * to, what to send to them, to look for, and what to do if that is
 * found.
 */

/* Connect on port 1080, sending "\5\1\0" as challenge.
 * If we get "\5\0" as a response, it's an unsecured socks5.
 */
 
"1080:050100" {
   "0500" "reject:Unsecured socks5";
};

/* Connect on port 1080, sending "\4\1" followed by the port
 * and IP of the client, followed by the (NUL-terminated) ident to
 * use. If we get a four byte response with '\x5a' as the second
 * byte, it's an unsecured socks4 proxy.
 *
 * It would be generally wise to replace the $p$i with a hard-coded
 * one; many insecure proxies refuse to connect to themselves.
 */

"1080:0401$p$i=p=r=o=x=y00" {
   "..5a...." "reject:Unsecured socks4";
};
 
"23:" {
// This first test is interesting: multi-stage, and a default action is reject
// this crap at the front is the router trying to negotiate telnet options
 
   "fffb01fffb03fffd18fffd1f0d0a0d0a=U=s=e=r= =A=c=c=e=s=s= 
    =V=e=r=i=f=i=c=a=t=i=o=n0d0a0d0a=P=a=s=s=w=o=r=d3a= :=c=i=s=c=o0d0a" {
           "0d0a=P=a=s=s=w=o=r=d3a= " "accept";
           "other" "reject:[1 hour] Cisco router with default password";
 
   };
 
   "=W=i=n=G=a=t=e=>" "reject:Unsecured wingate";
   "=T=o=o= =m=a=n=y" "reject:Unsecured wingate";
   "=E=n=t=e=r= =h=o=s=t= =n=a=m=e" "reject:Unsecured wingate";
   // the 3a is ':'; due to a parser glitch, =: isn't parsed like you might expect
   "=E=n=t=e=r= 3a= =<=h=o=s=t=>" "reject:Unsecured wingate";
};

/* Connect on port 3128 (squid), trying to use a HTTP CONNECT
 * proxy.  If we get a 200 response, it worked and should be
 * booted.
 *
 * If you do this check on port 80, you might check for "200
 * Connection" instead to reduce false positives; many servers
 * send 200 OK responses for custom 404 Error pages.
 *
 * As with the SOCKS4 check, you may want to replace the $c:3128
 * (client hostname and port) with a hard-coded one.
 */
 
"3128:=C=O=N=N=E=C=T= $c=:=3=1=2=8= =H=T=T=P=/=1=.=00d0a0d0a" {
   "=H=T=T=P=/=1=.=0= =2=0=0" "reject:Unsecured proxy";
};

"27374:" {
   "" "reject:Subseven detected";
};
</pre>