Konni's Flea Circus: How A Chat App Turned Your Whole Flock Into A Relay Station
I have been in this field since before most of your analysts knew what a command prompt was. I have watched threats evolve from mildly irritating to catastrophically embarrassing. And yet, somehow, this Konni situation still managed to make me set down my coffee.
Let me be direct. The Konni group is distributing fake grain through ZIP file attachments. The Flock clicks. The Flock always clicks. And what crawls out of that ZIP is a particularly nasty set of fleas called EndRAT, which then quietly makes itself at home in the wool and starts phoning home.
Here is the part that should concern you professionally and keep you awake personally. These parasites are propagating through KakaoTalk. A chat application. The wolves found a way to use your lambs' own social infrastructure as a delivery mechanism, turning each infected sheep into a relay that lures the next one. It is elegant, in the way that a bear trap is elegant. I do not enjoy admitting that.
In my day, if you wanted to propagate something, you needed physical media and a considerable amount of patience. Discipline was the natural filter. Now the Flock just forwards a ZIP file to eleven colleagues with a cheerful message and considers it networking.
The persistence mechanisms here are textbook but effective. EndRAT establishes itself quietly, enables data exfiltration, and essentially hands the wolves a remote control for your entire pasture. The Shepherds will not notice until the quarterly review, at which point they will ask why nobody told them.
Someone told them. Nobody listened. This is the natural order.
The Sky Pasture integration in many of these environments only compounds the exposure. More surface area, more gaps, more opportunities for a hole in the fence that nobody documented because the person who documented things left in 2019.
Remediation
First: block ZIP attachments from external senders at the Electric Fence level. Yes, someone will complain. Let them complain.
Second: if your organization uses KakaoTalk or any similar platform for business communication, establish strict controls on file sharing. Treat every attachment as suspect until proven otherwise. This is not paranoia. This is Tuesday.
Third: apply your shearing schedules religiously. EndRAT exploits environments that have not been properly dipped. Unpatched systems are an open invitation with a welcome mat.
Fourth: run tabletop exercises that specifically simulate chat-based luring scenarios. The Flock needs repetition. They will not remember the first time. Or the second.
Fifth: log everything. Tape-era discipline. If it is not logged, it did not happen, and if it did not happen, you cannot defend against it.
Stay suspicious out there, the wolves certainly are.
Original Report: https://thehackernews.com/2026/03/konni-deploys-endrat-through-spear.html