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x509 public key infrastructure cert

yara LOW Yara-Rules
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This rule was pulled from an open-source repository and enriched with AI. Validate in a test environment before deploying to production.
View original rule at Yara-Rules →
Retrieved: 2026-05-05T11:00:00Z · Confidence: medium

Hunt Hypothesis

The detection rule identifies potential misuse of x.509 certificates in a public key infrastructure setup, which could indicate unauthorized certificate generation or impersonation activities. SOC teams should proactively hunt for this behavior to uncover adversarial attempts to establish rogue certificates and compromise internal trust relationships within their Azure Sentinel environment.

YARA Rule

rule x509_public_key_infrastructure_cert
{	meta:
		desc = "X.509 PKI Certificate"
		ext = "crt"
	strings:
		$c0 = { 30 82 ?? ?? 30 82 ?? ?? }
	condition: 
		$c0
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

This rule contains 1 string patterns in its detection logic.

False Positive Guidance

Original source: https://github.com/Yara-Rules/rules/blob/main/crypto/crypto_signatures.yar