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Look for Random function

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: 2026-05-05T23:00:00Z · Confidence: medium

Hunt Hypothesis

The detection rule identifies the use of the Random function, which may indicate an adversary attempting to obfuscate or generate unpredictable values for malicious purposes. SOC teams should proactively hunt for this behavior in Azure Sentinel to uncover potential evasion tactics or automated tools used in advanced persistent threats.

YARA Rule

rule Unknown_Random {
	meta:
		author = "_pusher_"
		description = "Look for Random function"
		date = "2016-07"
	strings:
		$c0 = { 55 8B EC 52 8B 45 08 69 15 ?? ?? ?? ?? 05 84 08 08 42 89 15 ?? ?? ?? ?? F7 E2 8B C2 5A C9 C2 04 00 }
	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