public mosaic llc support@publicmosaic.com
confirmed host

IP address 218.244.142.4

vShellCobalt Strikecontrollers · :8084, :8889, :50050

Last confirmed 2026-09-14, first seen 2026-08-31. On AS37963.

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

This address answered on 3 ports — :8084, :8889, :50050, across 2 malware families.

218.244.142.4:8084 · vShell

Last confirmed (2 days ago)

first seen2026-09-01 06:09 UTC
serviceip-port · tcp
networkAS37963 · Hangzhou Alibaba Advertising
confidence100 / 100

vShell configuration

Operator-supplied settings recovered by detonating a captured sample in a sandbox — the configured command-and-control host, mutex and campaign, not a live reading of this address.

c2 host218.244.142.4 · same as this host
c2 port8084
typetcp

218.244.142.4:8889 · Cobalt Strike

Last confirmed (yesterday)

first seen2026-09-01 05:53 UTC
serviceip-port · tcp
networkAS37963 · Hangzhou Alibaba Advertising
confidence100 / 100
cs watermark987654321

Beacon configuration

callback218.244.142.4 · same as this host
beacon typeHTTP
cs versionCobalt Strike 4.8 (Feb 28, 2023)
getGET /dot.gif
postPOST /submit.php
user-agentMozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; BOIE9;ENUS)
sleep60s ±0%
watermark987654321
server key md5a117565a423cea976c7f68b875394225
inject stube43a1b63f09794f74d90a9889f7acb77
spawn to x86%windir%\syswow64\rundll32.exe
spawn to x64%windir%\sysnative\rundll32.exe

218.244.142.4:50050 · Cobalt Strike

Last confirmed (yesterday)

first seen2026-08-31 19:41 UTC
serviceip-port · tcp · Cobalt Strike team server default
networkAS37963 · Hangzhou Alibaba Advertising
confidence100 / 100
tls certificateaa6feed05dd52a236a440bbf777d0922ccec190001b1f07ad476c63cd7cc56fa
cert subjectMajor Cobalt Strike
cert subject orgcobaltstrike
cert issuerMajor Cobalt Strike
cert issuer orgcobaltstrike
cert validity2026-06-01 → 2026-08-30
cert typeself-signed
cert key2048-bit
cert serial (decimal)1718693927

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

Observation history

18d agotoday

Observed on 15 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 · 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 →

Showing 24 of 270. Full cohort →

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.

Pivots & lookups