Public Mosaic C2 indicators
confirmed host

104.143.204.78

Cobalt Strikecommand-and-control server · :443

On AS26383. Its certificate is shared with 145 other hosts.

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, watermarks last. A shared value says the hosts were set up alike, not that one operator runs them.

SharedValueOther hosts
Cobalt Strike server keyca1c5ee4c6f4451759972387cacad5ac32 other hosts · 32 listed
TLS certificate87f2085c32b6a2cc709b365f55873e207a9caa10bffecf2fd16d3cf9d94d390c145 other hosts · 143 listed
JA4X template2166164053c1_2166164053c1_30d204a01551420 other hosts · 417 listed
Cobalt Strike watermark66666666689 other hosts · 89 listed

A Cobalt Strike watermark is a weak link: cracked and leaked builds share one.

Network context

SharedValueOther hosts
NetworkAS26383 · Baxet Group5 other hosts · 5 listed

Hosts near this one, for context only.

Summary

First seen by the scanner2026-09-30
In this archive since2026-09-30
Evidence1 certificate · 1 beacon configuration · 1 file served
Look up elsewhereVirusTotal · Shodan · Censys
About this listingWhat a listing means · Is this your address?

Observation history

Listed on 31 of the 63 days since this archive began recording, 2026-08-29 UTC.

  1. listed
  2. :443

2026-08-292026-10-30

  • first seen to last confirmed
  • listed after its last confirmation

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
  • 2026-09-30 – 2026-10-30 (31 days)

104.143.204.78:443 · Cobalt Strike

Last confirmed (15 days ago)

first seen2026-09-30 06:00 UTC
serviceip-port · tcp · HTTPS
networkAS26383 · Baxet Group
confidence100 / 100
tls certificate87f2085c32b6a2cc709b365f55873e207a9caa10bffecf2fd16d3cf9d94d390c
cert validity2015-05-20 → 2025-05-17
cert typeself-signed
cert key2048-bit
cert serial (hex)08bb00ee
cert serial (decimal)146473198

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

ja4x2166164053c1_2166164053c1_30d204a01551
cs watermark666666666

Beacon configuration

callbackwww.microsslcheck.com · set in the beacon by its builder; may be a redirector or a borrowed name
beacon typeHTTPS
cs versionCobalt Strike 4.9 (Sep 19, 2023)
getGET /load/main.js
postPOST /updates/check.php
user-agentMozilla/5.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/5.0)
sleep30s ±5%
watermark666666666
server key md5ca1c5ee4c6f4451759972387cacad5ac
inject stub40ed048138df0b3e23a0ef24dc5efa1a
spawn to x86%windir%\syswow64\rundll32.exe
spawn to x64%windir%\sysnative\rundll32.exe

Hosts sharing a value with this one

453 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 Cobalt Strike, as this one is.

AddressSharesLast confirmedStatus
Cobalt Strike server key · 32 other hosts · 32 listed

Every beacon carries its team server’s public key. Hosts sharing one were set up from the same server installation, or from a leaked or cracked copy that ships its key file, so it is not evidence of a single operator.

8.163.59.20server key · certificate · JA4X template · watermarklisted
192.252.185.78server key · certificate · JA4X template · watermarklisted
113.250.188.15server key · certificate · JA4X template · watermarklisted
43.136.92.170server key · certificate · JA4X template · watermarklisted
49.235.158.141server key · certificate · JA4X template · watermarklisted
137.220.194.15server key · certificate · JA4X template · watermarklisted
150.158.102.111server key · certificate · JA4X template · watermarklisted
191.223.41.183server key · certificate · JA4X template · watermarklisted
192.252.179.24server key · certificate · JA4X template · watermarklisted
175.27.214.144server key · certificate · JA4X template · watermarklisted
47.109.23.77server key · JA4X template · watermarklisted
8.152.212.104server key · JA4X template · watermarklisted
47.120.32.72server key · JA4X template · watermarklisted
47.92.208.27server key · JA4X template · watermarklisted
43.138.116.60server key · JA4X template · watermarklisted
42.51.44.173server key · JA4X template · watermarklisted
45.203.213.168server key · JA4X template · watermarklisted
149.30.232.29server key · JA4X template · watermarklisted
114.215.188.153server key · JA4X template · watermarklisted
47.94.224.229server key · JA4X template · watermarklisted
102.134.35.205server key · watermarklisted
162.14.122.146server key · watermarklisted
43.167.177.224server key · watermarklisted
8.159.146.72server key · watermarklisted
47.236.149.142server key · watermarklisted
198.44.116.156server key · watermarklisted
103.236.84.103server key · watermarklisted
1.117.61.139server key · watermarklisted
117.72.125.206server key · watermarklisted
39.98.116.82server key · watermarklisted
39.102.125.11server key · watermarklisted
207.57.123.57server key · watermarklisted
TLS certificate · 145 other hosts · 143 listed

These hosts presented the same certificate. Leaked or resold profiles reuse certificates, so this is not evidence of a single operator.

Of these, 10 are listed under an earlier value and 127 are past the 40 hosts shown.

117.72.182.5certificate · JA4X template · watermarklisted
49.232.42.116certificate · JA4X templatelisted
47.105.36.109certificate · JA4X templatelisted
101.42.255.92certificate · JA4X template · watermarklisted
111.231.116.164certificate · JA4X templatelisted
117.72.181.104certificate · JA4X templatelisted
60.247.206.23certificate · JA4X templatelisted
222.255.215.42certificate · JA4X templatelisted
JA4X template · 420 other hosts · 417 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, 28 are listed under an earlier value and 392 are past the 40 hosts shown.

Cobalt Strike watermark · 89 other hosts · 89 listed

The watermark identifies the Cobalt Strike licence a beacon was built with. Cracked and leaked builds share watermarks widely, so it is not evidence of a single operator.

Of these, 34 are listed under an earlier value and 55 are past the 40 hosts shown.

Samples served · 1 file

Files this address was seen serving, each identified by running or analysing it. A widely distributed file can reach unrelated hosts.

Every file here was served on :443.

FileConfirmedFile last seen
3c83abcc4f3bd4ff3feb913efab1d7cd96aa821e19288ce2ca5ae7fb3deb6571analysed

Deploy

Suricata rules and hunt queries for this address’s 1 listed listener.

Suricata rules

Each query searches the last 30 days of your logs for connections to these listeners and for the 1 file this address served. Queries hold only addresses, ports and file hashes.

Microsoft Defender XDR (KQL)
DeviceNetworkEvents
| where Timestamp > ago(30d)
| where (RemoteIP == "104.143.204.78" and RemotePort in (443))
DeviceFileEvents
| where Timestamp > ago(30d)
| where SHA256 in ("3c83abcc4f3bd4ff3feb913efab1d7cd96aa821e19288ce2ca5ae7fb3deb6571")
Microsoft Sentinel (KQL)
CommonSecurityLog
| where TimeGenerated > ago(30d)
| where (DestinationIP == "104.143.204.78" and DestinationPort in (443))
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="104.143.204.78" (All_Traffic.dest_port=443)))
    by All_Traffic.src_ip All_Traffic.dest_ip All_Traffic.dest_port
| tstats summariesonly=false count min(_time) as first_time max(_time) as last_time
    from datamodel=Endpoint.Filesystem where earliest=-30d
    (Filesystem.file_hash="3c83abcc4f3bd4ff3feb913efab1d7cd96aa821e19288ce2ca5ae7fb3deb6571")
    by Filesystem.dest Filesystem.file_path Filesystem.file_hash
Elastic (EQL)
network where
  (destination.ip == "104.143.204.78" and destination.port in (443))
file where file.hash.sha256 in ("3c83abcc4f3bd4ff3feb913efab1d7cd96aa821e19288ce2ca5ae7fb3deb6571")

Cite this record

Plain text, for a ticket or a report
Address 104.143.204.78 Family Cobalt Strike (command-and-control server) Ports :443 Status listed (feed checked 2026-10-30 18:37 UTC) First seen 2026-09-30 Last confirmed 2026-10-15 Record https://publicmosaic.com/ip/104.143.204.78 Source Public Mosaic, TLP:CLEAR