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Look for CRC32 [poly]

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: 2026-04-23T09:00:00Z · Confidence: medium

Hunt Hypothesis

Adversaries may use CRC32 hash values to obfuscate or manipulate data during exfiltration or persistence. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify potential data tampering or covert communication channels.

YARA Rule

rule CRC32_poly_Constant {
	meta:
		author = "_pusher_"
		description = "Look for CRC32 [poly]"
		date = "2015-05"
		version = "0.1"
	strings:
		$c0 = { 2083B8ED }
	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