Find Cell

I lost my phone while I was travelling back to home but I was able to get back my eNB ID, MCC and MNC could you help me catch the tower it was last found. Note: decimal value upto 1 digit

15B

challenge.txt

So firstly, after seeing what they have said about the eNB ID, MCC, and MNC, I decided to look up what they meant, so :

• eNB ID : used to identify an EnodeB uniquely

• MCC : mobile country code

• MNC : mobile network code

You can distinguish which one is which by knowing that the MCC and MNC are both 3 digits so 81097 must be the eNB ID

We can use the MCC and MNC to find out that the cell tower is in the US, and that its provider is AT&T. Now we need to triangulate the cell tower so after a bit of googling I found a website called cellmapper.net, where you can specify the eNB ID, MNC and MCC, so finally you get the latlong coordinates by clicking on the location, which are 32.8464489 and -24.554806.

Flag:

Because we know that the briefing says the format is darkCTF{latitude, longtitude} to 1 decimal place we know that the flag is DarkCTF{38.4, 24.5}

The rounding is very odd