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RijnDael AES

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 RijnDael AES detection rule identifies potential use of a custom AES encryption algorithm, which may indicate adversarial data exfiltration or persistence mechanisms. SOC teams should proactively hunt for this behavior in Azure Sentinel to detect and respond to advanced threats that leverage custom cryptographic techniques to evade standard detection methods.

YARA Rule

rule RijnDael_AES
{	meta:
		author = "_pusher_"
		description = "RijnDael AES"
		date = "2016-06"
	strings:
		$c0 = { A5 63 63 C6 84 7C 7C F8 }
	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