public mosaic llc support@publicmosaic.com
confirmed host

IP address 38.207.177.73

Cobalt Strikecommand-and-control server · :9966

Last confirmed 2026-08-29, first seen 2026-08-28. On AS139659.

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

38.207.177.73:9966 · Cobalt Strike

Last confirmed (17 days ago)

first seen2026-08-28 21:51 UTC
serviceip-port · tcp
networkAS139659 · LUCIDACLOUD
confidence98 / 100
cs watermark987654321

Beacon configuration

callback38.207.177.73 · same as this host
beacon typeHTTP
cs versionCobalt Strike 4.8 (Feb 28, 2023)
getGET /cm
postPOST /submit.php
user-agentMozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0; BOIE9;ENAU)
sleep60s ±0%
watermark987654321
server key md57820b28fd142e5cac7f8f0df637d233b
inject stube43a1b63f09794f74d90a9889f7acb77
spawn to x86%windir%\syswow64\rundll32.exe
spawn to x64%windir%\sysnative\rundll32.exe

Observation history

18d agotoday

Observed on 1 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.

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

Neighbourhood · 38.207.177.0/24 · 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