public mosaic llc support@publicmosaic.com
confirmed host

IP address 103.212.186.85

Cobalt Strikecommand-and-control server · :8888

Last confirmed 2026-09-09, first seen 2026-09-06. On AS401701. Its certificate is shared with 99 other confirmed hosts.

listed last confirmed feed checked TLP:CLEAR SURICATA .RULES SEE THE LIVE FEED →

103.212.186.85:8888 · Cobalt Strike

Last confirmed (6 days ago)

first seen2026-09-06 05:10 UTC
serviceip-port · tcp
networkAS401701 · cognetcloud
confidence100 / 100
tls certificate87f2085c32b6a2cc709b365f55873e207a9caa10bffecf2fd16d3cf9d94d390c
cert validity2015-05-20 → 2025-05-17
cert typeself-signed
cert key2048-bit
cert serial (decimal)146473198

The certificate names above are what the certificate ASSERTS, not proof this host owns them — a self-signed certificate can claim any subject, so treat a familiar name here as an impersonation attempt rather than an identity.

ja4x2166164053c1_2166164053c1_30d204a01551
cs watermark666666666

Beacon configuration

callback103.212.186.85 · same as this host
beacon typeHTTPS
cs versionCobalt Strike 4.9 (Sep 19, 2023)
getGET /updates.rss
postPOST /submit.php
user-agentMozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0; BOIE9;ENXA)
sleep60s ±0%
watermark666666666
server key md580b3cbcd66440fd1bc68c4a194b712e1
inject stube781a4479f7c5a03b2dcfe4bd436366f
spawn to x86%windir%\syswow64\rundll32.exe
spawn to x64%windir%\sysnative\rundll32.exe

Observation history

18d agotoday

Observed on 4 of the 18 days since this archive began recording, 2026-08-29 UTC. Presence is per UTC day: a day is marked when the scanner confirmed this address at least once, not once per scan.

Shared TLS certificate · 99 hosts

These hosts served the same certificate. That is the strongest link this corpus can draw between two addresses, though it evidences a shared BUILD rather than a shared operator: a leaked or resold profile puts the same certificate in different hands. Full cohort →

Showing 24 of 99. Full cohort →

Shared JA4X issuance template · 270 hosts

These hosts issued certificates from the same template — the same distinguished-name fields hashed in the same order. It links tooling, not necessarily an operator. Full cohort →

Showing 24 of 270. Full cohort →

Shared Cobalt Strike watermark · 56 hosts

A watermark identifies the Cobalt Strike licence a beacon was generated from. Hosts sharing one were built from the same copy of the software — which is not the same as one operator, since cracked and leaked builds circulate widely and share a watermark by definition.

Showing 24 of 56. The rest are reachable from any of them.

Neighbourhood · 103.212.186.0/24 · 1 host

1 other confirmed host in the same /24. Adjacent addresses under one operator are a different signal from a shared certificate — they suggest a block, not a build.

Pivots & lookups