k3ym𖺀2d ago

In today's episode of "Can It Run Doom": DNS fucking TXT records.

Some absolute madlad (cough Adam Rice cough) compressed the entire shareware DOOM WAD, split it into around 1,964 chunks, shoved them into Cloudflare TXT records, and wrote a PowerShell script that reassembles and runs the whole goddamn game from DNS queries alone. Nothing touches disk. The DLLs are in DNS. THE FUCKING DLLS ARE IN DNS.

RFC 1035 was written in 1987. Those engineers are spinning in their graves fast enough to generate municipal power.

Bonus: this is a fully functional globally-distributed covert data exfil channel that your NGFW will never fucking see if you're not doing deep DNS inspection. Sleep well.

blog: https://blog.rice.is/post/doom-over-dns/

repo: https://github.com/resumex/doom-over-dns

Also lmao @ every blue team that has never once looked at their DNS query volume. How's that DLP policy working out for you.

It was always DNS.

#infosec #dns #doom #itisalwaysdns

Show threadSimon Hewison
@k3ym0 I did long ago work out that DNS is jolly good at distributing fairly static hierarchical datasets, because it inherently caches. For instance, they were once used to route faxes to appropriate gateways on the old tpc.int email to fax service. I also worked out a postcode to address and postcode geocoding schema.
1:20pmWeb