public mosaic llc support@publicmosaic.com
confirmed host

43.139.173.26

Cobalt Strikecommand-and-control server · :12581, :12580

Last confirmed 2026-09-09, first seen 2026-09-05. On AS45090.

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

This address answered on 2 ports — :12581, :12580.

43.139.173.26:12581 · Cobalt Strike

Last confirmed (6 days ago)

first seen2026-09-05 21:27 UTC
serviceip-port · tcp
networkAS45090 · Shenzhen Tencent Computer Systems Com…
confidence100 / 100
cs watermark666666666

Beacon configuration

callback43.139.173.26 · same as this host
beacon typeHTTP
cs versionCobalt Strike 4.9 (Sep 19, 2023)
getGET /activity
postPOST /submit.php
user-agentMozilla/5.0 (compatible; MSIE 9.0; qdesk 2.4.1263.203; Windows NT 6.1; WOW64; Trident/5.0)
sleep60s ±0%
watermark666666666
server key md5cbc2b87350981e2fdd2bc8fb66998681
inject stub40ed048138df0b3e23a0ef24dc5efa1a
spawn to x86%windir%\syswow64\rundll32.exe
spawn to x64%windir%\sysnative\rundll32.exe

43.139.173.26:12580 · Cobalt Strike

Last confirmed (6 days ago)

first seen2026-09-05 21:27 UTC
serviceip-port · tcp
networkAS45090 · Shenzhen Tencent Computer Systems Com…
confidence100 / 100
cs watermark666666666

Beacon configuration

callback43.139.173.26 · same as this host
beacon typeHTTP
cs versionCobalt Strike 4.9 (Sep 19, 2023)
getGET /load
postPOST /submit.php
user-agentMozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0)
sleep60s ±0%
watermark666666666
server key md5cbc2b87350981e2fdd2bc8fb66998681
inject stub40ed048138df0b3e23a0ef24dc5efa1a
spawn to x86%windir%\syswow64\rundll32.exe
spawn to x64%windir%\sysnative\rundll32.exe

Observation history

18d agotoday

Observed on 5 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 · 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.

1.92.135.168Cobalt Strike101.126.10.34Cobalt Strike101.201.109.2Cobalt Strike101.37.236.20Cobalt Strike101.42.255.92Cobalt Strike103.204.174.212Cobalt Strike103.212.186.85Cobalt Strike103.236.84.103Cobalt Strike103.6.169.62Cobalt Strike107.172.217.220Cobalt Strike111.228.5.127Cobalt Strike113.250.188.15Cobalt Strike114.215.188.153Cobalt Strike114.66.27.110Cobalt Strike116.205.106.137Cobalt Strike117.72.125.206Cobalt Strike117.72.182.5Cobalt Strike120.76.143.184Cobalt Strike123.207.214.140Cobalt Strike124.222.161.70Cobalt Strike124.222.210.55Cobalt Strike137.220.194.15Cobalt Strike139.196.111.118Cobalt Strike149.30.232.29Cobalt Strike

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

Pivots & lookups

same asn → 358 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.