Public Mosaic C2 indicators
confirmed host

20.111.19.203

Adaptixcommand-and-control server · :4321, :443

On AS8075.

listed last confirmed feed checked TLP:CLEAR Suricata rules Show in the live feed

Relations

Values this address shares with other hosts in this archive, rarest first. A shared value says the hosts were set up alike, not that one operator runs them.

SharedValueOther hosts
JA4X template5de83f524929_5de83f524929_795797892f9c121 other hosts · 121 listed

Not shared with any other host in this archive: 2 certificates.

Not a pivot:

  • JA4X template 000000000000_000000000000_e1926048963f

This fingerprint records a certificate with no distinguished name: its issuer and subject sections are both empty. It links this host to no other.

Network context

SharedValueOther hosts
NetworkAS8075 · Microsoft88 other hosts · 79 listed

Hosts near this one, for context only.

Summary

First seen by the scanner2026-10-12
In this archive since2026-10-12
Ports2 · 2 listed
Evidence2 certificates
Look up elsewhereVirusTotal · Shodan · Censys
About this listingWhat a listing means · Is this your address?

Ports

This address answered on 2 ports. First seen and last confirmed dates are per row, by UTC day.

PortFirst seenLast confirmedStatusTLS certificateJA4X
:4321listed15a0718c9e8a5de83f524929_5de83f524929_795797892f9c
:443 · HTTPSlisted52ad8b7ce5dc000000000000_000000000000_e1926048963f · empty DN

This fingerprint records a certificate with no distinguished name: its issuer and subject sections are both empty. It links this host to no other.

Observation history

Listed on 19 of the 63 days since this archive began recording, 2026-08-29 UTC.

  1. listed
  2. :4321
  3. :443

2026-08-292026-10-30

  • first seen to last confirmed

A marked day is a UTC day the feed listed this address. The feed keeps a listener for up to 90 days after its last confirmation, so a listed day is not a confirmation. A listener no longer in the feed is drawn to its last confirmation.

Listed days as dates
  • 2026-10-12 – 2026-10-30 (19 days)

Evidence

Each certificate, configuration and file appears once, with the listeners that carried it.

TLS certificate 15a0718c9e8a

On :4321.

tls certificate15a0718c9e8a9d357035e66ae29136b3164474d6ebde6007eab72d91eac0e03f
cert subject orgInternet Widgits Pty Ltd
cert issuer orgInternet Widgits Pty Ltd
cert validity2026-10-06 → 2036-10-03
cert typeself-signed
cert key2048-bit
cert serial (hex)6c8bbd5f07ea9cbd8e7be13d85388e7baddd5ec8
cert serial (decimal)619687303390959157919132323149375644953260941000

The names above are what the certificate claims, not proof that this host owns them. Treat a familiar name as a likely impersonation.

TLS certificate 52ad8b7ce5dc

On :443.

tls certificate52ad8b7ce5dc72a428519a03e169ec677b0782d93332010deb884b18b55fd24a
cert validity2026-10-06 → 2027-10-06
cert typeself-signed
cert key2048-bit
cert serial (hex)497a4e34636908bfa205cbd89f4a0b82
cert serial (decimal)97668690087619637762004899345572957058
cert names127.0.0.1 ::1 localhost

The names above are what the certificate claims, not proof that this host owns them. Treat a familiar name as a likely impersonation.

Listeners

Each listener below shows its status and what sets it apart. Dates are in Ports; certificates, configurations and files in Evidence. Common to both listeners:

serviceip-port · tcp
networkAS8075 · Microsoft
confidence100 / 100

20.111.19.203:4321 · Adaptix

listed · certificate 15a0718c9e8a

20.111.19.203:443 · Adaptix

listed · certificate 52ad8b7ce5dc

Hosts sharing a value with this one

121 other hosts in this archive share at least one value with this one. Each is listed once, under its first shared value in Relations order. Dates and status are from the records that share a value. Showing the 40 that rank first. Every host shown is labelled Adaptix, as this one is.

AddressSharesLast confirmedStatus
JA4X template · 121 other hosts · 121 listed

These hosts’ certificates share one JA4X template, which points to the same certificate tooling. It is not evidence of a single operator.

Of these, 81 are past the 40 hosts shown.

38.60.203.203JA4X templatelisted
182.255.45.114JA4X templatelisted
37.72.168.189JA4X templatelisted
188.166.244.201JA4X templatelisted
185.207.154.11JA4X templatelisted
23.227.203.190JA4X templatelisted
43.225.157.17JA4X templatelisted
181.41.201.103JA4X templatelisted
92.4.93.169JA4X templatelisted
91.215.85.182JA4X templatelisted
91.215.85.180JA4X templatelisted
91.202.233.155JA4X templatelisted
91.202.233.154JA4X templatelisted
80.253.251.221JA4X templatelisted
8.137.111.232JA4X templatelisted
45.202.1.16JA4X templatelisted
43.161.245.213JA4X templatelisted
43.133.165.151JA4X templatelisted
39.105.16.200JA4X templatelisted
37.72.168.163JA4X templatelisted
23.227.203.71JA4X templatelisted
206.206.103.203JA4X templatelisted
193.143.1.148JA4X templatelisted
182.92.227.226JA4X templatelisted
178.94.25.230JA4X templatelisted
146.70.87.218JA4X templatelisted
120.27.155.171JA4X templatelisted
116.198.18.139JA4X templatelisted
103.228.171.113JA4X templatelisted
103.116.52.203JA4X templatelisted
43.140.219.182JA4X templatelisted
31.56.228.50JA4X templatelisted
185.242.245.120JA4X templatelisted
121.127.253.146JA4X templatelisted
23.227.199.67JA4X templatelisted
38.132.122.161JA4X templatelisted
130.185.82.117JA4X templatelisted
185.213.20.250JA4X templatelisted
154.219.115.123JA4X templatelisted
23.227.203.6JA4X templatelisted

Deploy

Suricata rules and hunt queries for this address’s 2 listed listeners.

Suricata rules

Each query searches the last 30 days of your logs for connections to these listeners. Queries hold only addresses, ports and file hashes.

Microsoft Defender XDR (KQL)
DeviceNetworkEvents
| where Timestamp > ago(30d)
| where (RemoteIP == "20.111.19.203" and RemotePort in (443, 4321))
Microsoft Sentinel (KQL)
CommonSecurityLog
| where TimeGenerated > ago(30d)
| where (DestinationIP == "20.111.19.203" and DestinationPort in (443, 4321))
Splunk (SPL, CIM data models)
| tstats summariesonly=false count min(_time) as first_time max(_time) as last_time
    from datamodel=Network_Traffic where earliest=-30d
    ((All_Traffic.dest_ip="20.111.19.203" (All_Traffic.dest_port=443 OR All_Traffic.dest_port=4321)))
    by All_Traffic.src_ip All_Traffic.dest_ip All_Traffic.dest_port
Elastic (EQL)
network where
  (destination.ip == "20.111.19.203" and destination.port in (443, 4321))

Cite this record

Plain text, for a ticket or a report
Address 20.111.19.203 Family Adaptix (command-and-control server) Ports :443, :4321 Status listed (feed checked 2026-10-30 18:37 UTC) First seen 2026-10-12 Last confirmed 2026-10-30 Record https://publicmosaic.com/ip/20.111.19.203 Source Public Mosaic, TLP:CLEAR