Jérôme Meyer

190 Followers
164 Following
38 Posts

Security research at Nokia Deepfield (he/they).

EN/FR posts | Fan of Crocker’s Rules, art, and the Oxford comma.

Homepagehttps://med.ac/about
Signaljmeyer.01
Work accounthttps://infosec.exchange/@deepfield

#TerraBot: first #DDoS botnet we've seen carrying a working exploit for CVE-2026-0073 (Critical ADB auth bypass, patched May 2026).

Every other ADB botnet needs auth disabled; this one doesn't. Comes with 30+ methods + dual APK/ELF cross-platform worming.

C2: terrabot.qzz[.]io:69
Staging: 140.233.190[.]47 (AS214209)
hash: a532a072687f5bd6f8f4c2fb1ce899a5d3c4264453fe2e7bafc270e83661c893

#threatintel

Full technical report on the Potassium botnet, including latest campaign & C2 domains: https://github.com/deepfield/public-research/blob/main/potassium/report.md

#threatintel #DDoS

public-research/potassium/report.md at main · deepfield/public-research

DDoS botnet research and indicators of compromise from Nokia Deepfield ERT - deepfield/public-research

GitHub

I’m still completely lost with logic of JA4+ patent licensing and actual incompatibility with the copyleft-license. So it seems to be a patent-based license and really risky to implement if you want to keep your actual software open source.

Did someone explore alternatives to avoid this? and especially other format which are open source friendly?

#ja4 #ja3 #jarm #cti #opensource #patent #cti
#threatintel #cybersecurity

🔗 https://github.com/FoxIO-LLC/ja4/blob/main/License%20FAQ.md

@campuscodi @censys also notes in https://censys.com/blog/the-cpanel-situation-is/ that this may be related to a Mirai-derivative we have been tracking under Flameblox. I should be able to confirm that with the next attack commands.
The cPanel Situation Is… - Censys

CVE-2026-41940 is a critical pre-authentication bypass affecting cPanel and WHM. The vulnerability already appears to have been weaponized by multiple third parties.

Censys

Potassium update: the Mirai fork @synthient reported in March (https://x.com/deobfuscately/status/2033923869782712514) is still active and the operator appears to have taken up Dutch poetry. The new C2 domain is ikhebkankerinmijnrechterteelbal[.]st (would not recommend pasting that into Google Translate during standup.)

Same key material and HTTP C2 protocol as the original potassium.vitacoco...[.]st variant. 11-port random C2 rotation, spreading via ADB to Android TV boxes.

IoCs:

a87aa7995ee9996952edb323d703875812f71d08237756ab44367f10e6197c7e
6833cb4681ac69281474be2c626df06cd90bb05bec72ae697cf219a6603826c9
3f13e18e190a7fc4c795d7caa83534d2879376ce43fd1a9120f23e48639cfe85

C2: ikhebkankerinmijnrechterteelbal[.]st → byte-swapped → 45.153.34[.]245
Dropper: 92.38.186[.]44 (HTTP + netcat :25565)

#mirai #DDoS #threatintel

edit: added byte-swapped C2 value

Ben (@deobfuscately) on X

Potassium Botnet Installer: http://169[.]40[.]135[.]69/1000mgofpotassiumaday/arm7 C2: potassium[.]vitacocoyougolocobecauseyouaresodamndeliciocobarampam[.]st #ioc #hunting #mirai

X (formerly Twitter)
@campuscodi Saw a ~6 Tbps attack this morning with about 5k hosting sources, which had one thing in common: cPanel
@hrbrmstr congratulations on the new job! (And welcome to the Ann Arbor nexus)

New report from our ERT: #Maskify.

The operator built what a Series A deck would call "decentralized edge infrastructure": ENS for service discovery, IPFS for binary distribution, a custom P2P mesh network, QUIC transport.

In practice it is a DDoS botnet running on Android TV boxes that did not opt in.

https://github.com/deepfield/public-research/blob/main/maskify/report.md

#threatintel #ddos

public-research/maskify/report.md at main · deepfield/public-research

DDoS botnet research and indicators of compromise from Nokia Deepfield ERT - deepfield/public-research

GitHub

When a botnet operator names their payload after your team, you check the diff.

libcyn.so → deepfield.so
Custom cipher → wolfSSL TLS 1.3 (same stack as earlier Kimwolf)

C2 domains, floods, targets: all unchanged.

9a28696774d9ef6754540633daeef668767df5efa1804138abd35e1a6b31523e

#drifter #threatintel #ddos

The backstory of #Kimwolf, from our initial sightings early last year to how @synthient discovered the vuln that made that botnet possible.

https://www.wsj.com/tech/kimwolf-hack-residential-proxy-networks-a712ab59?st=3eNTjx