Public Mosaic C2 indicators
confirmed host

218.237.58.53

Cobalt Strikecommand-and-control server · :50050, :443, :80

On AS9318. It presented 2 certificates; 56 other hosts share at least one of them.

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

SharedValueOther hosts
Cobalt Strike server key5a36284cd6c4fb5cffc67e8bb58754151 other host · 1 listed
TLS certificate56a06a233bd30f693de25ef12cc19e8b2c92d3eb97dd969a2578df084c37647856 other hosts · 56 listed
Issuance cohort2166164053c1_2166164053c1_30d204a01551_60e4afe8b719_4c8172b9dba556 other hosts · 56 listed
JA4X template2166164053c1_2166164053c1_30d204a01551429 other hosts · 426 listed
Cobalt Strike callbackbbb.0101011010010111001.com1 other host · 1 listed
Cobalt Strike watermark66666666690 other hosts · 90 listed

A Cobalt Strike callback is a weak link: the beacon’s builder sets it, and a borrowed name does not mean the named domain is involved.

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

Not shared with any other host in this archive: 1 certificate.

Network context

SharedValueOther hosts
NetworkAS9318 · SK Broadband Co1 other host · 1 listed

Hosts near this one, for context only.

Summary

First seen by the scanner2026-10-31
In this archive since2026-11-01
Ports3 · 3 listed
Evidence2 certificates · 2 beacon configurations · 4 files served
Look up elsewhereVirusTotal · Shodan · Censys
About this listingWhat a listing means · Is this your address?

Ports

This address answered on 3 ports. First seen and last confirmed dates are per row, by UTC day.

PortFirst seenLast confirmedStatusTLS certificateJA4XConfiguration
:50050 · Cobalt Strike team-server defaultlisted56a06a233bd32166164053c1_2166164053c1_30d204a01551
:443 · HTTPSlisted353ab63b2a972166164053c1_2166164053c1_30d204a01551beacon 1
:80listedbeacon 2

Observation history

Listed on 1 of the 65 days since this archive began recording, 2026-08-29 UTC.

  1. listed
  2. :50050
  3. :443 and 1 more

2026-08-292026-11-01

  • 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
  • 2026-11-01 (1 day)

Evidence

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

TLS certificate 56a06a233bd3

On :50050.

tls certificate56a06a233bd30f693de25ef12cc19e8b2c92d3eb97dd969a2578df084c376478
cert subjectMajor Cobalt Strike
cert subject orgcobaltstrike
cert issuerMajor Cobalt Strike
cert issuer orgcobaltstrike
cert validity2022-08-30 → 2022-11-28
cert typeself-signed
cert key2048-bit
cert serial (hex)27530dfe
cert serial (decimal)659754494

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 353ab63b2a97

On :443.

tls certificate353ab63b2a97fdbc7760e4c38f3e6edab311ad755a233d6820e75a976e056c4f
cert subjectjquery.com
cert subject orgjQuery
cert issuerjquery.com
cert issuer orgjQuery
cert validity2026-10-31 → 2027-10-31
cert typeself-signed
cert key2048-bit
cert serial (hex)43ab7d8c
cert serial (decimal)1135312268

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

Beacon configurations

2 configurations on 2 listeners. Common to both:

callbackbbb.0101011010010111001.com · set in the beacon by its builder; may be a redirector or a borrowed name
cs versionCobalt Strike 4.9 (Sep 19, 2023)
getGET /jquery-3.3.1.min.js
postPOST /jquery-3.3.2.min.js
get clientAccept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 · Accept-Encoding: gzip, deflate · __cfduid= · Cookie
post clientAccept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 · Accept-Encoding: gzip, deflate · __cfduid
user-agentMozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36 OPR/111.0.0.0 (Edition Yx 03)
sleep5s ±25%
watermark666666666
masked watermark63f3495a38df0b2679c382569328aa3510bd5ed7599e5a524dc69e74b81fc727
server key md55a36284cd6c4fb5cffc67e8bb5875415
inject stub40ed048138df0b3e23a0ef24dc5efa1a
inject executeCreateThread "ntdll!RtlUserThreadStart+0x42" · CreateThread · NtQueueApcThread_s · CreateRemoteThread · RtlCreateUserThread
inject transform x86append 9090 · prepend
spawn to x86%windir%\syswow64\runonce.exe
spawn to x64%windir%\sysnative\runonce.exe

Each configuration calls back on its own listener’s port. Where they differ:

Configurationbeacon type
Beacon 1 · :443HTTPS
Beacon 2 · :80HTTP

Listeners

Each listener below shows its status and what sets it apart. Dates are in Ports; certificates, configurations and files in Evidence. Common to all 3 listeners:

serviceip-port · tcp
networkAS9318 · SK Broadband Co
confidence100 / 100

218.237.58.53:50050 · Cobalt Strike

listed · certificate 56a06a233bd3

cohortshared issuance template · 57 hosts

218.237.58.53:443 · Cobalt Strike

listed · certificate 353ab63b2a97 · beacon 1

observed hostjquery.com
jarm2ad2ad16d2ad2ad00042d42d00042ddb04deffa1705e2edc44cae1ed24a4da

218.237.58.53:80 · Cobalt Strike

listed · beacon 2

Hosts sharing a value with this one

462 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 · 1 other host · 1 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.

175.124.145.102server key · certificate · issuance cohort · JA4X template · callback · watermarklisted
TLS certificate · 56 other hosts · 56 listed

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

Of these, 1 is listed under an earlier value and 16 are past the 40 hosts shown.

43.243.73.187certificate · issuance cohort · JA4X templatelisted
103.12.148.37certificate · issuance cohort · JA4X templatelisted
103.115.57.95certificate · issuance cohort · JA4X templatelisted
113.250.188.15certificate · issuance cohort · JA4X template · watermarklisted
156.254.20.46certificate · issuance cohort · JA4X template · watermarklisted
156.254.20.48certificate · issuance cohort · JA4X template · watermarklisted
156.254.20.47certificate · issuance cohort · JA4X template · watermarklisted
111.228.5.127certificate · issuance cohort · JA4X template · watermarklisted
60.247.206.23certificate · issuance cohort · JA4X templatelisted
47.120.32.72certificate · issuance cohort · JA4X template · watermarklisted
69.12.73.213certificate · issuance cohort · JA4X templatelisted
43.136.19.18certificate · issuance cohort · JA4X templatelisted
192.3.251.109certificate · issuance cohort · JA4X templatelisted
192.253.229.133certificate · issuance cohort · JA4X templatelisted
139.196.201.58certificate · issuance cohort · JA4X templatelisted
134.122.204.168certificate · issuance cohort · JA4X templatelisted
120.48.18.226certificate · issuance cohort · JA4X templatelisted
107.148.237.76certificate · issuance cohort · JA4X templatelisted
124.223.22.132certificate · issuance cohort · JA4X templatelisted
185.184.70.41certificate · issuance cohort · JA4X templatelisted
8.137.169.91certificate · issuance cohort · JA4X templatelisted
47.93.243.161certificate · issuance cohort · JA4X templatelisted
114.215.190.105certificate · issuance cohort · JA4X templatelisted
123.56.124.3certificate · issuance cohort · JA4X templatelisted
106.12.61.28certificate · issuance cohort · JA4X templatelisted
47.98.124.244certificate · issuance cohort · JA4X templatelisted
139.196.111.118certificate · issuance cohort · JA4X template · watermarklisted
146.19.216.170certificate · issuance cohort · JA4X templatelisted
146.19.216.163certificate · issuance cohort · JA4X templatelisted
154.94.237.203certificate · issuance cohort · JA4X templatelisted
64.7.199.195certificate · issuance cohort · JA4X templatelisted
134.122.203.247certificate · issuance cohort · JA4X templatelisted
1.15.76.39certificate · issuance cohort · JA4X templatelisted
95.182.114.29certificate · issuance cohort · JA4X templatelisted
150.158.102.111certificate · issuance cohort · JA4X template · watermarklisted
111.230.37.219certificate · issuance cohort · JA4X templatelisted
42.194.241.92certificate · issuance cohort · JA4X templatelisted
82.156.242.28certificate · issuance cohort · JA4X templatelisted
154.219.101.56certificate · issuance cohort · JA4X templatelisted
Issuance cohort · 56 other hosts · 56 listed

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

Of these, 40 are listed under an earlier value and 16 are past the 40 hosts shown.

JA4X template · 429 other hosts · 426 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, 40 are listed under an earlier value and 389 are past the 40 hosts shown.

Cobalt Strike callback · 1 other host · 1 listed

A beacon’s callback is set by its builder and may be a redirector or a borrowed name, which does not mean the named domain is involved. Hosts naming the same one are not evidence of a single operator.

Of these, 1 is listed under an earlier value.

Cobalt Strike watermark · 90 other hosts · 90 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, 9 are listed under an earlier value and 81 are past the 40 hosts shown.

Samples served · 4 files

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

FileConfirmedDelivered onFile last seen
c3f63cf618d947d01058034207875b2bb6a39f966a0953ec4ee122ece409d5ecanalysed:443
edef3be40b4fedd191cd3ee1774cf7f58b20ab7fd64cffdc86b1e7cf9d145ac4analysed:80
74d683b6a6113c1331238f2ee8dd2704bf48dd2ca16d3999e7d20732bc7a56d4analysed:443
d548b36b1ab11fd8e4a87c44cef3e03e2ea407c993588f0da9b880aaba8f551fanalysed:80

Deploy

Suricata rules and hunt queries for this address’s 3 listed listeners.

Suricata rules

Each query searches the last 30 days of your logs for connections to these listeners and for the 4 files this address served. Queries hold only addresses, ports and file hashes.

Microsoft Defender XDR (KQL)
DeviceNetworkEvents
| where Timestamp > ago(30d)
| where (RemoteIP == "218.237.58.53" and RemotePort in (80, 443, 50050))
DeviceFileEvents
| where Timestamp > ago(30d)
| where SHA256 in ("74d683b6a6113c1331238f2ee8dd2704bf48dd2ca16d3999e7d20732bc7a56d4", "c3f63cf618d947d01058034207875b2bb6a39f966a0953ec4ee122ece409d5ec", "d548b36b1ab11fd8e4a87c44cef3e03e2ea407c993588f0da9b880aaba8f551f", "edef3be40b4fedd191cd3ee1774cf7f58b20ab7fd64cffdc86b1e7cf9d145ac4")
Microsoft Sentinel (KQL)
CommonSecurityLog
| where TimeGenerated > ago(30d)
| where (DestinationIP == "218.237.58.53" and DestinationPort in (80, 443, 50050))
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="218.237.58.53" (All_Traffic.dest_port=80 OR All_Traffic.dest_port=443 OR All_Traffic.dest_port=50050)))
    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="74d683b6a6113c1331238f2ee8dd2704bf48dd2ca16d3999e7d20732bc7a56d4" OR Filesystem.file_hash="c3f63cf618d947d01058034207875b2bb6a39f966a0953ec4ee122ece409d5ec" OR Filesystem.file_hash="d548b36b1ab11fd8e4a87c44cef3e03e2ea407c993588f0da9b880aaba8f551f" OR Filesystem.file_hash="edef3be40b4fedd191cd3ee1774cf7f58b20ab7fd64cffdc86b1e7cf9d145ac4")
    by Filesystem.dest Filesystem.file_path Filesystem.file_hash
Elastic (EQL)
network where
  (destination.ip == "218.237.58.53" and destination.port in (80, 443, 50050))
file where file.hash.sha256 in ("74d683b6a6113c1331238f2ee8dd2704bf48dd2ca16d3999e7d20732bc7a56d4", "c3f63cf618d947d01058034207875b2bb6a39f966a0953ec4ee122ece409d5ec", "d548b36b1ab11fd8e4a87c44cef3e03e2ea407c993588f0da9b880aaba8f551f", "edef3be40b4fedd191cd3ee1774cf7f58b20ab7fd64cffdc86b1e7cf9d145ac4")

Cite this record

Plain text, for a ticket or a report
Address 218.237.58.53 Family Cobalt Strike (command-and-control server) Ports :80, :443, :50050 Status listed (feed checked 2026-11-01 09:37 UTC) First seen 2026-10-31 Last confirmed 2026-11-01 Record https://publicmosaic.com/ip/218.237.58.53 Source Public Mosaic, TLP:CLEAR