public mosaic llc support@publicmosaic.com
confirmed host

115.190.250.28

Cobalt Strikecommand-and-control server · :5521

Last confirmed 2026-09-15, first seen 2026-09-02. On AS137718.

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

115.190.250.28:5521 · Cobalt Strike

Last confirmed (today)

first seen2026-09-02 10:48 UTC
serviceip-port · tcp
networkAS137718 · Beijing Volcano Engine Technology
confidence100 / 100
cs watermark987654321

Beacon configuration

callback115.190.250.28 · same as this host
beacon typeHTTP
cs versionCobalt Strike 4.8 (Feb 28, 2023)
getGET /j.ad
postPOST /submit.php
user-agentMozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322)
sleep60s ±0%
watermark987654321
server key md51181f059dd3443abd3f7283687090789
inject stube43a1b63f09794f74d90a9889f7acb77
spawn to x86%windir%\syswow64\rundll32.exe
spawn to x64%windir%\sysnative\rundll32.exe

Observation history

18d agotoday

Observed on 14 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 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 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 Strike124.220.34.180Cobalt Strike

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

Pivots & lookups

same asn → 21 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.