Azure WireServer HTTP Request from Unexpected User Agent

Last updated a month ago on 2026-08-17

Created a month ago on 2026-08-17

About

Identifies HTTP requests to Azure WireServer (168.63.129.16) for GoalState, certificates, versions, or HostGAPlugin vmSettings that do not use a known guest-agent user agent. These requests retrieve transport certificates and extension protectedSettings, including embedded SAS URLs. Azure Linux Agent, Windows guest agent, and related platform UAs are excluded. Requests with no user agent are also excluded; that pattern is common for the Windows guest agent.

Tags

Domain: CloudDomain: NetworkOS: LinuxOS: WindowsPlatform: AzureUse Case: Threat DetectionTactic: Credential AccessTactic: DiscoveryData Source: Network Packet CaptureLanguage: eql

Severity

medium

Risk Score

MITRE ATT&CK™

Credential Access (TA0006)(external, opens in a new tab or window)

↳ Unsecured Credentials (T1552)(external, opens in a new tab or window)

Discovery (TA0007)(external, opens in a new tab or window)

↳ System Information Discovery (T1082)(external, opens in a new tab or window)

False Positive Examples

Custom health checks that call HostGAPlugin /versions or /vmSettings with curl. Exclude the specific user agent or host group after validating the script.

License

Elastic License v2(external, opens in a new tab or window)

Definition

Rule Type: Event Correlation Rule
Integration Pack: Prebuilt Security Detection Rules
Index Patterns: logs-network_traffic.http*
Related Integrations: network_traffic(external, opens in a new tab or window)
Query

✄𐘗text code block:
✄𐘗network where event.module == "network_traffic" and
destination.ip == "168.63.129.16" and
user_agent.original != null and
not user_agent.original : (
  "WALinuxAgent*",
  "VMAgent*",
  "Python-urllib*",
  "cpprestsdk*",
  "ACMS/*"
) and
(
  url.query : ("*comp=versions*", "*comp=goalstate*", "*comp=certificates*") or
  (destination.port == 32526 and url.path : ("/versions", "/vmSettings"))
)

Install detection rules in Elastic Security

Detect Azure WireServer HTTP Request from Unexpected User Agent in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(external, opens in a new tab or window).