diff --git a/README.md b/README.md
index fa7599f..cf9ba07 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,7 @@ shiny devices are fun, finding and poking holes in their interface is a _lot_ of
 ## devices
 name | description | url
 -----|-------------|-----
+[CUJO](http://trycujo.com) | purposeful MiTM device for internet 'security'
 [LG webOS](http://www.lge.com) | HTTP phone home is never a good idea | [lg-webOS](lg_webOS)
 [HooToo TripMate series](http://www.hootoo.com) | there are lots of problems, some end up at root access | [hootoo](hootoo)
 [Philips Hue](http://www.meethue.com) | device communication insecure, Ruby library/CLI to control via REST HTTP | [hued](https://github.com/chorankates/hued)
diff --git a/cujo/README.md b/cujo/README.md
new file mode 100644
index 0000000..1701f75
--- /dev/null
+++ b/cujo/README.md
@@ -0,0 +1,146 @@
+# CUJO
+
+- [device](#device)
+- [digging](#digging)
+  - [nmap](#nmap)
+  - [sniffing](#sniffing)
+- [impersonating](#impersonating)
+  - [phone home](#phone-home)
+
+## TV
+name|value
+----|-----
+model|TODO
+product|`TODO`
+firmware|`TODO`
+features|TODO 
+vulnerabilities|all phone-home calls are done over `HTTP`
+
+
+## digging
+
+### nmap
+
+from `nmap -PN -sV <device>`, we get:
+
+```
+<TODO all ports are closed>
+```
+
+### sniffing
+
+watching the network activity of the device (`192.168.1.108`), noticed it tried to resolve:
+
+  * agent.cujo.io
+  * jenkins.getcujo.com
+  
+but since the network isn't allowing external traffic, the DNS resolution fails. 
+
+the device continues to retry this, but takes no other action.
+
+using `dnsmasq`, spoof these addresses to something under out control (`192.168.1.106`), and now we see:
+
+```
+Frame 125229: 74 bytes on wire (592 bits), 74 bytes captured (592 bits)
+Ethernet II, Src: 192.168.1.108 (cc:d3:1e:d0:20:67), Dst: 192.168.1.106 (f4:0f:24:04:2e:8f)
+Internet Protocol Version 4, Src: 192.168.1.108 (192.168.1.108), Dst: agent.cujo.io (192.168.1.106)
+Transmission Control Protocol, Src Port: 53455 (53455), Dst Port: 9443 (9443), Seq: 0, Len: 0
+    Source Port: 53455
+    Destination Port: 9443
+    [Stream index: 14]
+    [TCP Segment Len: 0]
+    Sequence number: 0    (relative sequence number)
+    Acknowledgment number: 0
+    Header Length: 40 bytes
+    Flags: 0x002 (SYN)
+    Window size value: 14600
+    [Calculated window size: 14600]
+    Checksum: 0xaf14 [validation disabled]
+    Urgent pointer: 0
+    Options: (20 bytes), Maximum segment size, SACK permitted, Timestamps, No-Operation (NOP), Window scale
+        Maximum segment size: 1460 bytes
+            Kind: Maximum Segment Size (2)
+            Length: 4
+            MSS Value: 1460
+        TCP SACK Permitted Option: True
+        Timestamps: TSval 51225, TSecr 0
+        No-Operation (NOP)
+        Window scale: 5 (multiply by 32)
+
+```
+
+now we can see it is making some empty TCP request to `9443`
+
+## impersonating
+
+### phone home
+
+standing up a webserver on `9443`, we start to see traffic:
+
+```
+\x16\x03\x01\x02\x00\x01\x00\x01\xfc\x03\x03\xa1\xe1\x9d\x08\x88]*\xce\xe7G
+```
+
+```
+\x16\x03\x01\x02\x00\x01\x00\x01\xfc\x03\x03Gg\xed\xa3m\x02\x88\xbd\xf0\xd1\x1eS\xf0\xfbc\xfb\x80K\x8dD\xed\xfb\x9b\x8c\xa0\xb2\xc6C\xc8\x15\x86\xbb\x00\x00\xa0\xc00\xc0,\xc0(\xc0$\xc0\x14\xc0
+```
+
+requests starting with `\x16\x03\x01` are almost certainly HTTPS requests coming over HTTP, so try to forge a usable cert:
+
+```
+$ openssl req -x509 -newkey rsa:2048 -keyout agents.cujo.io.pem -out agents.cujo.io.pem -days 365 -nodes
+Generating a 2048 bit RSA private key
+........................................................................................+++
+..........................................................................................................+++
+writing new private key to 'agents.cujo.io.pem'
+-----
+You are about to be asked to enter information that will be incorporated
+into your certificate request.
+What you are about to enter is what is called a Distinguished Name or a DN.
+There are quite a few fields but you can leave some blank
+For some fields there will be a default value,
+If you enter '.', the field will be left blank.
+-----
+Country Name (2 letter code) [AU]:US
+State or Province Name (full name) [Some-State]:California
+Locality Name (eg, city) []:Los Angeles
+Organization Name (eg, company) [Internet Widgits Pty Ltd]:CUJO
+Organizational Unit Name (eg, section) []:
+Common Name (e.g. server FQDN or YOUR name) []:agent.cujo.io
+Email Address []:
+
+$ openssl x509 -text -in agents.cujo.io.pem
+Certificate:
+    Data:
+        Version: 3 (0x2)
+        Serial Number:
+            e6:5b:e3:de:c4:4f:13:7e
+        Signature Algorithm: sha1WithRSAEncryption
+        Issuer: C=US, ST=California, L=Los Angeles, O=CUJO, CN=agent.cujo.io
+        Validity
+            Not Before: Nov 29 01:38:50 2016 GMT
+            Not After : Nov 29 01:38:50 2017 GMT
+        Subject: C=US, ST=California, L=Los Angeles, O=CUJO, CN=agent.cujo.io
+        Subject Public Key Info:
+            Public Key Algorithm: rsaEncryption
+            RSA Public Key: (2048 bit)
+                Modulus (2048 bit):
+                ...
+                Exponent: 65537 (0x10001)
+        X509v3 extensions:
+            X509v3 Subject Key Identifier:
+                B2:33:5E:3A:3D:6E:B8:DC:D8:19:89:A2:B5:67:1C:99:B1:B0:2F:2F
+            X509v3 Authority Key Identifier:
+                keyid:...
+                DirName:/C=US/ST=California/L=Los Angeles/O=CUJO/CN=agent.cujo.io
+                serial:...
+
+            X509v3 Basic Constraints:
+                CA:TRUE
+    Signature Algorithm: sha1WithRSAEncryption
+        ...
+-----BEGIN CERTIFICATE-----
+...
+-----END CERTIFICATE-----
+```
+