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confirmed host

IP address 156.40.156.39

Cobalt Strikecommand-and-control server · :80, :8443

Last confirmed 2026-09-02, first seen 2026-08-27. On AS3527.

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

This address answered on 2 ports — :80, :8443.

156.40.156.39:80 · Cobalt Strike

Last confirmed (13 days ago)

first seen2026-08-28 08:19 UTC
serviceip-port · tcp
networkAS3527 · National Institutes of Health
confidence98 / 100

156.40.156.39:8443 · Cobalt Strike

Last confirmed (13 days ago)

first seen2026-08-27 15:56 UTC
serviceip-port · tcp · alt-HTTPS
networkAS3527 · National Institutes of Health
confidence100 / 100
tls certificate891340c83944973221766514afac9e69c2e7684cf34dcf413ef4631430ef7ab7
cert subjectMajor Cobalt Strike
cert subject orgcobaltstrike
cert issuerMajor Cobalt Strike
cert issuer orgcobaltstrike
cert validity2026-05-04 → 2026-08-02
cert typeself-signed
cert key3072-bit
cert serial (decimal)10294237980290546539

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

Observation history

18d agotoday

Observed on 5 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 →

Pivots & lookups