The Killer Clown (hacktoria)

February 1st 2025 | #ctf #hacktoria #osint

Briefing

Greetings, Special Agent.

We have a very urgent case on our hands. The San Francisco Police Department is working on a true horror case this October. There is an actual killer clown roaming the streets of the greater San Francisco area.

The killer is dressed as a clown and strikes at night, mostly targeting women and younger men. The victims are drugged and bound tightly with a long rope, stretching all the way around the body. After this, the killer attaches an oxygen tank to the victim and puts them inside a coffin sized box.

The victim is then buried alive and a picture is taken of the location, which is then sent to the police. With the amount of oxygen in the tank, victims usually last about 24 hours. Though with the panic setting in, some die withing 6 hours. A few others suffered a heart attack from the panic.

About 30 minutes ago, the San Francisco Police Department received a new picture from the clown. This time we have reason to believe the victim is Melany Parker, a 23 year old woman from Northwest Berkeley. She was reported missing by her boyfriend, after she didn’t return from her evening jog.

Given the circumstances, we have no time to waste. Your assignment is simple, find the location of the picture below. Before the next victim dies, tied up in a box underground, slowly suffocating while tightly wrapped in ropes.

As always, Special Agent, the contract is yours, if you choose to accept.

Answer Instruction

Use the answer to unlock the flagfile, this will reward you with your badge.

Use the name of the park + name of the path,

Sample: local-park-name-dirty-mud-path

So we have two locations - San Francisco - Northwest Berkeley

Check San Francisco "Parks and Recreation" (https://www.sfrecpark.org/) they should know a thing or two about SF Parks. The search feature allows filtering, but there are too much and North-west Berkeley parks are not included:

One of the Parks mentioned repeatedly is Ohlone Park:

Although it is quite big, it is mainly a dog park (probably not the best place to bury anyone...) and the benches are different:

Two other bigger parks can be found left of Ohlone Park. Strawberry Creek Park Playground and Cedar Rose Park.

Strawberry Creek features the same bins:

However a house with a roof like the one in the picture is nowhere near:

Next: Cedar Rose Park which has very similar benches, bins, ...

...and similar looking rooftops nearby:

Found it!!

Dead ends:

Trying to identify the plants: https://identify.plantnet.org/k-world-flora/identify

Looking for geolocated park benches in flickr:

The Flickr group friends of the East Bay Regional Parks https://www.flickr.com/groups/ebrpd/

Putting it all together:

cedar-rose-park-ohlone-greenway


< subscribe (thm) | trooper (thm) >