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confirmed host

154.12.90.231

Cobalt Strikecommand-and-control server · :443

Last confirmed 2026-08-31, first seen 2026-08-29. On AS401696.

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

154.12.90.231:443 · Cobalt Strike

Last confirmed (15 days ago)

first seen2026-08-29 06:41 UTC
serviceip-port · tcp · HTTPS blend-in
observed hostseesollc.cyou
networkAS401696 · cognetcloud
confidence100 / 100
tls certificatea927566bf9c09ac8e2761f5cbaa4ea8a662f28393f879bcba6c028c4c5beaa4c
cert subjectCloudFlare Origin Certificate
cert subject orgCloudFlare, Inc.
cert issuer orgCloudFlare, Inc.
cert validity2026-08-20 → 2041-08-16
cert typeCA-signed
cert key2048-bit
cert serial (decimal)708210658369683601359339657115331703219649954759
cert names*.seesollc.cyou seesollc.cyou

The certificate names above were validated by the issuing authority at issuance. They describe the certificate, not conduct by the names' owner — a legitimately issued certificate can be deployed on a listed host by whoever holds its private key, so treat the name as a pivot to investigate rather than as an attribution.

ja4xdc020972a4a8_9fb583da09a2_fb02ba79e164
jarm21d19d00021d21d00042d43d00000091f9827a8676a9d9f27d421962a09b5d
cs watermark987654321

Beacon configuration

callbackseesollc.cyou · same as this host
beacon typeHTTP
cs versionCobalt Strike 4.9 (Sep 19, 2023)
getGET /gp/aw/s/ref=is_s_/167-3294888-0262949/field-keywords=books
postPOST /N4215/adj/amzn.us.sr.aps
user-agentMozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36
sleep5s ±30%
watermark987654321
server key md57b70e142caa5b0a15071ce5ae9e33256
inject stubae5afcfee8026674dc8f3b4f2da46c7f
spawn to x86%windir%\syswow64\rundll32.exe
spawn to x64%windir%\sysnative\rundll32.exe

Observation history

18d agotoday

Observed on 3 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 JA4X issuance template · 19 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 →

101.33.202.134Adaptix107.172.217.220Cobalt Strike111.229.4.108Cobalt Strike151.236.21.109Havoc154.205.145.109Havoc154.94.224.35Cobalt Strike155.117.155.141Adaptix165.154.225.239Cobalt Strike167.172.142.69Havoc193.239.85.15Havoc210.2.169.213Havoc216.238.54.156BTMOB23.148.212.123Cobalt Strike23.148.212.86Cobalt Strike41.216.189.62Adaptix43.155.169.245Cobalt Strike45.87.53.6Cobalt Strike47.83.3.103Cobalt Strike87.232.84.18Adaptix

Shared Cobalt Strike watermark · 108 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.

1.15.76.39Cobalt Strike1.94.65.9Cobalt Strike101.200.193.211Cobalt Strike101.201.103.158Cobalt Strike101.42.136.73Cobalt Strike103.119.47.222Cobalt Strike103.217.186.180Cobalt Strike104.168.102.116Cobalt Strike106.15.10.2Cobalt Strike111.228.4.54Cobalt Strike111.231.116.164Cobalt Strike115.159.226.190Cobalt Strike115.190.161.178Cobalt Strike115.190.250.28Cobalt Strike116.198.233.179Cobalt Strike117.50.184.221Cobalt Strike117.72.242.9Cobalt Strike118.24.172.48Cobalt Strike118.89.79.131Cobalt Strike118.89.88.183Cobalt Strike119.45.160.160Cobalt Strike120.55.3.157Cobalt Strike120.55.93.58Cobalt Strike120.77.254.122Cobalt Strike

Showing 24 of 108. The rest are reachable from any of them.

Neighbourhood · 154.12.90.0/24 · 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.

154.12.90.160Flying Eagle

Pivots & lookups

same ja4x → 19 other hosts same asn → 16 other hosts lookups: virustotal · shodan · censys

Listed in error?

This page is generated from automated scanning and is publicly available. If you are responsible for this address and it should not be listed, write to support@publicmosaic.com — see abuse & takedown for what we need and what happens next, or opt-out to exclude a whole range from scanning.

Addresses are frequently compromised third-party hosts rather than infrastructure their owner stood up. A listing records what a scan observed at a point in time; it is not an allegation about whoever pays for the address.