Public Mosaic C2 indicators
confirmed host

39.106.221.81

Cobalt Strikecommand-and-control server · :8088

On AS37963.

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 watermark66666666689 other hosts · 89 listed

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

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

Network context

SharedValueOther hosts
NetworkAS37963 · Hangzhou Alibaba Advertising431 other hosts · 430 listed

Hosts near this one, for context only.

Summary

First seen by the scanner2026-10-21
In this archive since2026-10-21
Evidence1 beacon configuration · 1 file served
Look up elsewhereVirusTotal · Shodan · Censys
About this listingWhat a listing means · Is this your address?

Observation history

Listed on 10 of the 63 days since this archive began recording, 2026-08-29 UTC.

  1. listed
  2. :8088

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
  • 2026-10-21 – 2026-10-30 (10 days)

39.106.221.81:8088 · Cobalt Strike

Last confirmed (9 days ago)

first seen2026-10-21 06:08 UTC
serviceip-port · tcp
networkAS37963 · Hangzhou Alibaba Advertising
confidence100 / 100
cs watermark666666666

Beacon configuration

callback39.106.221.81 · same as this host
beacon typeHTTP
cs versionCobalt Strike 4.9 (Sep 19, 2023)
getGET /IE9CompatViewList.xml
postPOST /submit.php
user-agentMozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; Trident/6.0)
sleep60s ±0%
watermark666666666
server key md518d857e3737a625e77f6389baf3fd201
inject stub40ed048138df0b3e23a0ef24dc5efa1a
spawn to x86%windir%\syswow64\rundll32.exe
spawn to x64%windir%\sysnative\rundll32.exe

Hosts sharing a value with this one

89 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.

AddressFamilySharesLast confirmedStatus
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, 49 are past the 40 hosts shown.

36.93.147.195Cobalt Strikewatermarklisted
8.163.59.20Cobalt Strikewatermarklisted
117.72.182.5Cobalt Strikewatermarklisted
192.252.185.78Cobalt Strikewatermarklisted
102.134.35.205Cobalt Strikewatermarklisted
47.109.23.77Cobalt Strikewatermarklisted
113.250.188.15Cobalt Strikewatermarklisted
101.42.255.92Cobalt Strikewatermarklisted
8.152.212.104Cobalt Strikewatermarklisted
154.12.86.154Cobalt Strikewatermarklisted
47.120.32.72Cobalt Strikewatermarklisted
82.156.186.185Cobalt Strikewatermarklisted
49.232.21.222Cobalt Strikewatermarklisted
111.228.5.127Cobalt Strikewatermarklisted
106.53.168.218Cobalt Strikewatermarklisted
85.11.182.104Cobalt Strikewatermarklisted
156.254.20.48Cobalt Strikewatermarklisted
156.254.20.47Cobalt Strikewatermarklisted
162.14.122.146Cobalt Strikewatermarklisted
156.254.20.46Cobalt Strikewatermarklisted
1.117.74.144Cobalt Strikewatermarklisted
124.220.22.82Cobalt Strikewatermarklisted
154.219.115.123Cobalt Strikewatermarklisted
43.167.177.224Cobalt Strikewatermarklisted
43.136.92.170Cobalt Strikewatermarklisted
8.159.146.72Cobalt Strikewatermarklisted
47.108.225.4Cobalt Strikewatermarklisted
106.75.7.239Cobalt Strikewatermarklisted
49.235.158.141Cobalt Strikewatermarklisted
1.92.135.168Cobalt Strikewatermarklisted
47.236.149.142Cobalt Strikewatermarklisted
198.44.116.156Cobalt Strikewatermarklisted
139.196.111.118Cobalt Strikewatermarklisted
43.142.137.169Cobalt Strikewatermarklisted
47.109.103.59VShellwatermarklisted
118.25.147.157Cobalt Strikewatermarklisted
175.124.145.102Cobalt Strikewatermarklisted
103.236.84.103Cobalt Strikewatermarklisted
8.156.80.127Cobalt Strikewatermarklisted
137.220.194.15Cobalt Strikewatermarklisted

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 :8088.

FileConfirmedFile last seen
ae08fdeedc66ea70e9c07468f9ef97dff63b0994e5b1fe4d7f6ed51a46f7f122analysed

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 == "39.106.221.81" and RemotePort in (8088))
DeviceFileEvents
| where Timestamp > ago(30d)
| where SHA256 in ("ae08fdeedc66ea70e9c07468f9ef97dff63b0994e5b1fe4d7f6ed51a46f7f122")
Microsoft Sentinel (KQL)
CommonSecurityLog
| where TimeGenerated > ago(30d)
| where (DestinationIP == "39.106.221.81" and DestinationPort in (8088))
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="39.106.221.81" (All_Traffic.dest_port=8088)))
    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="ae08fdeedc66ea70e9c07468f9ef97dff63b0994e5b1fe4d7f6ed51a46f7f122")
    by Filesystem.dest Filesystem.file_path Filesystem.file_hash
Elastic (EQL)
network where
  (destination.ip == "39.106.221.81" and destination.port in (8088))
file where file.hash.sha256 in ("ae08fdeedc66ea70e9c07468f9ef97dff63b0994e5b1fe4d7f6ed51a46f7f122")

Cite this record

Plain text, for a ticket or a report
Address 39.106.221.81 Family Cobalt Strike (command-and-control server) Ports :8088 Status listed (feed checked 2026-10-30 18:37 UTC) First seen 2026-10-21 Last confirmed 2026-10-21 Record https://publicmosaic.com/ip/39.106.221.81 Source Public Mosaic, TLP:CLEAR