public mosaic llc support@publicmosaic.com
confirmed host

39.96.125.59

Cobalt Strikecommand-and-control server · :8551, :50050

Last confirmed 2026-09-11, first seen 2026-09-09. On AS37963. Its certificate is shared with 3 other confirmed hosts.

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

This address answered on 2 ports — :8551, :50050.

39.96.125.59:8551 · Cobalt Strike

Last confirmed (4 days ago)

first seen2026-09-10 01:11 UTC
serviceip-port · tcp
networkAS37963 · Hangzhou Alibaba Advertising
confidence100 / 100
cs watermark0

Beacon configuration

callback39.96.125.59 · same as this host
beacon typeHTTP
cs versionCobalt Strike 4.1 (Jun 25, 2020)
getGET /push
postPOST /submit.php
user-agentMozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0; BOIE9;ENAU)
sleep60s ±0%
watermark0
server key md5e72c5d3441421ece5f815e26cd6af69f
inject stub187ab8f98098de95714613f8544c9613
spawn to x86%windir%\syswow64\rundll32.exe
spawn to x64%windir%\sysnative\rundll32.exe

39.96.125.59:50050 · Cobalt Strike

Last confirmed (4 days ago)

first seen2026-09-09 12:05 UTC
serviceip-port · tcp · Cobalt Strike team server default
networkAS37963 · Hangzhou Alibaba Advertising
confidence100 / 100
tls certificate64257fc0fac31c01a5ccd816c73ea86e639260da1604d04db869bb603c2886e6
cert subjectMajor Cobalt Strike
cert subject orgcobaltstrike
cert issuerMajor Cobalt Strike
cert issuer orgcobaltstrike
cert validity2019-06-14 → 2019-09-12
cert typeself-signed
cert key2048-bit
cert serial (decimal)856871957

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
cohortshared issuance template · 4 hosts

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 TLS certificate · 3 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 →

109.236.50.145Cobalt Strike118.25.100.71Cobalt Strike146.70.232.107Cobalt Strike

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 →

1.14.104.208Cobalt Strike1.15.76.39Cobalt Strike101.126.10.34Cobalt Strike101.200.193.211Cobalt Strike101.200.29.195Cobalt Strike101.200.85.0Cobalt Strike101.201.103.158Cobalt Strike101.201.109.2Cobalt Strike101.33.200.145Cobalt Strike101.33.225.32Cobalt Strike101.35.238.122Cobalt Strike101.42.136.73Cobalt Strike101.42.255.92Cobalt Strike101.43.103.154Cobalt Strike102.203.116.201Cobalt Strike103.119.47.222Cobalt Strike103.12.148.37Cobalt Strike103.204.174.212Cobalt Strike103.212.186.85Cobalt Strike103.27.111.130Cobalt Strike103.6.169.62Cobalt Strike104.168.102.116Cobalt Strike106.15.10.2Cobalt Strike106.53.61.9Cobalt Strike

Showing 24 of 270. Full cohort →

Shared Cobalt Strike watermark · 6 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.

109.236.50.145Cobalt Strike117.50.180.204Cobalt Strike118.25.100.71Cobalt Strike14.103.160.117Cobalt Strike47.236.56.15Cobalt Strike47.96.106.127Cobalt Strike

Pivots & lookups

same cert → 3 other hosts same ja4x → 270 other hosts same asn → 323 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.