public mosaic llc support@publicmosaic.com
confirmed host

IP address 139.196.50.117

Cobalt Strikecommand-and-control server · :20266, :8839, :20275

Last confirmed 2026-09-15, first seen 2026-09-02. On AS37963.

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

This address answered on 3 ports — :20266, :8839, :20275.

139.196.50.117:20266 · Cobalt Strike

Last confirmed (today)

first seen2026-09-07 10:53 UTC
serviceip-port · tcp
networkAS37963 · Hangzhou Alibaba Advertising
confidence100 / 100
tls certificate0b40fcf9a403fb78bbf688f3aae05f16e9ec64c6f7960fe986ddef504ad9730a
cert subjectPwn3rs Striked
cert subject orgPwn3rs
cert issuerPwn3rs Striked
cert issuer orgPwn3rs
cert validity2026-07-23 → 2026-10-21
cert typeself-signed
cert key3072-bit
cert serial (decimal)9339036740275403492

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

139.196.50.117:8839 · Cobalt Strike

Last confirmed (today)

first seen2026-09-06 10:45 UTC
serviceip-port · tcp
networkAS37963 · Hangzhou Alibaba Advertising
confidence100 / 100
tls certificate0b40fcf9a403fb78bbf688f3aae05f16e9ec64c6f7960fe986ddef504ad9730a
cert subjectPwn3rs Striked
cert subject orgPwn3rs
cert issuerPwn3rs Striked
cert issuer orgPwn3rs
cert validity2026-07-23 → 2026-10-21
cert typeself-signed
cert key3072-bit
cert serial (decimal)9339036740275403492

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
jarm2ad2ad16d2ad2ad00042d42d00042ddb04deffa1705e2edc44cae1ed24a4da
cs watermark987654321

Beacon configuration

callback139.196.50.117 · same as this host
beacon typeHTTPS
cs versionCobalt Strike 4.9 (Sep 19, 2023)
getGET /wp06/wp-includes/po.php
postPOST /includes/phpmailer/class.pop3.php
user-agentMozilla/5.0 (Windows; U; MSIE 7.0; Windows NT 5.2) Java/1.5.0_08
sleep10s ±0%
watermark987654321
server key md50be9b8abddf88b77ced2e8051626fde2
inject stubae5afcfee8026674dc8f3b4f2da46c7f
spawn to x86%windir%\syswow64\rundll32.exe
spawn to x64%windir%\sysnative\rundll32.exe

139.196.50.117:20275 · Cobalt Strike

Last confirmed (today)

first seen2026-09-02 10:52 UTC
serviceip-port · tcp
networkAS37963 · Hangzhou Alibaba Advertising
confidence100 / 100
cs watermark987654321

Beacon configuration

callback139.196.50.117 · same as this host
beacon typeHTTP
cs versionCobalt Strike 4.9 (Sep 19, 2023)
getGET /wp08/wp-includes/dtcla.php
postPOST /includes/phpmailer/class.pop3.php
user-agentMozilla/5.0 (Windows; U; MSIE 7.0; Windows NT 5.2) Java/1.5.0_08
sleep10s ±0%
watermark987654321
server key md50be9b8abddf88b77ced2e8051626fde2
inject stubae5afcfee8026674dc8f3b4f2da46c7f
spawn to x86%windir%\syswow64\rundll32.exe
spawn to x64%windir%\sysnative\rundll32.exe

Observation history

18d agotoday

Observed on 14 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