I participated with CTF.SG again, but as most of us were burnt out from 0ctf, we didn’t have the full force this time around.
The site uses fixed scoring and not dynamic, so some questions were determined to be easier than others.
Category: Forensics | 42 solves | 100 points
Challenge DescriptionDumbster diving. File Download Link
The challenge description mentions Dumpster, which means Garbage Bin - thus we check the Recycle Bin.
When I first opened it, I saw many recycled
phrases, like over 1000 files maybe, so I knew it was the right place.
As we are searching for something that stands out, let’s sort by file type to filter out all these
Upon doing so, I found a very obvious
BSIDESTLV2020.txt, which I opened and there was the flag!
Category: Forensics | 29 solves | 200 points
Challenge DescriptionYou need some EFF in your life. File Download Link
From what I can tell, EFF refers to Electronic Frontier Foundation, which doesn’t mean anything for us.
So what can be better with less, in a computer context? Maybe your browsing history?
Hence I went to check for browser history! First IE… nope nothing there.
So I continued looking for something that stood out… this time it was Chrome History!
Unfortunately I deleted the 8 GB image so I don’t have a screenshot now.
And we’ve found the flag!