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MediumElastic detection rulesElastic

Azure WireServer OpenSSL Certificate Decrypt or LinuxTransport Generation

Identifies OpenSSL generating a CN=LinuxTransport certificate or decrypting CMS/PKCS7 payloads with a key that is not the Azure Linux Agent certificate under /var/lib/waagent. Adversaries can scrape WireServer…

Description

Identifies OpenSSL generating a CN=LinuxTransport certificate or decrypting CMS/PKCS7 payloads with a key that is not the Azure Linux Agent certificate under /var/lib/waagent. Adversaries can scrape WireServer certificates, mint a LinuxTransport identity, and decrypt extension protectedSettings with openssl cms -decrypt or smime -decrypt.

Detection logic

Its licence does not clear it for publishing here

Sunturai publishes a detection's own text where the licence it arrived under has been reviewed and permits it, and Elastic License 2.0 has not. The query as its source wrote it, its canonical form and the hash that pins this revision are in the workspace record.

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Detection requirements

Platform
ContainersESXiIaaSIdentity ProviderLinuxmacOSNetwork DevicesOffice SuiteSaaSWindows

The rule states no platform. This is derived from the 2 ATT&CK techniques it maps to.

Log source category
event_index

Known benign triggers

  • Custom configuration-management that decrypts CMS blobs with an organization key outside /var/lib/waagent. Confirm the key path and exclude the specific command line after review.

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