Add some material

calculation.php/README.md

@@ -1,8 +1,11 @@
-# calculation.php - semi-garbled
+# calculation.php - semi-garbled sketchy redirector
 
 Decodes to some incomplete PHP with trailing junk bytes, probably
 because a Base64 encoding got a bad character in it.
 
+Redirects human-run browsers, but deletes all `.htaccess` files
+if it gets a specially-valued google.
+
 ## Origin
 
 ### Download
@@ -21,11 +24,9 @@ DNS has 185.13.5.43 → s43.freehost.com.ua
 
 `p0f3` has 185.13.5.43 as FreeBSD 9.x or newer.
 
-`nmap` says: Aggressive OS guesses: FreeBSD 7.1-RELEASE - 9.0-CURRENT (96%),
-FreeBSD 10.3-RELEASE (94%), FreeBSD 8.1-RELEASE (92%), FreeBSD 9.1-RELEASE or
-10.1-RELEASE (92%), OpenBSD 4.0 (x86) (91%), FreeBSD 9.2-RELEASE (91%),
-FreeBSD 7.0-RELEASE-p1 - 10.0-CURRENT (91%), FreeBSD 9.0-RELEASE (91%),
-FreeBSD 7.0-BETA4 - 7.0 (90%), Cisco AsyncOS 9.6 - 9.7 (90%)
+`nmap` says:
+
+    Aggressive OS guesses: FreeBSD 7.1-RELEASE - 9.0-CURRENT (96%), FreeBSD 10.3-RELEASE (94%), FreeBSD 8.1-RELEASE (92%), FreeBSD 9.1-RELEASE or 10.1-RELEASE (92%), OpenBSD 4.0 (x86) (91%), FreeBSD 9.2-RELEASE (91%), FreeBSD 7.0-RELEASE-p1 - 10.0-CURRENT (91%), FreeBSD 9.0-RELEASE (91%), FreeBSD 7.0-BETA4 - 7.0 (90%), Cisco AsyncOS 9.6 - 9.7 (90%)
 
 but it also gets back "OpenSSH 6.0p1 Debian 4+deb7u2 (protocol 2.0)"
 from the SSH server.