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Mirai Variant 5

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: 2026-06-24T11:00:00Z · Confidence: medium

Hunt Hypothesis

The hypothesis is that the detection rule identifies potential Mirai Variant 5 botnet activity through unusual network traffic patterns indicative of distributed denial-of-service attacks. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify and mitigate early-stage botnet infections before they cause widespread disruption.

YARA Rule

rule Mirai_5 : MALW
{
	meta:
		description = "Mirai Variant 5"
		author = "Joan Soriano / @joanbtl"
		date = "2017-04-16"
		version = "1.0"
		MD5 = "7e17c34cddcaeb6755c457b99a8dfe32"
		SHA1 = "b63271672d6a044704836d542d92b98e2316ad24"

	strings:
		    $dir1 = "/dev/watchdog"
		    $dir2 = "/dev/misc/watchdog"
		    $s1 = "PMMV"
		    $s2 = "ZOJFKRA"
		    $s3 = "FGDCWNV"
		    $s4 = "OMVJGP"
		    $ssl = "ssl3_ctrl"
	condition:
		    $dir1 and $dir2 and $s1 and $s2 and $s3 and $s4 and $ssl

}

Deployment Notes

This YARA rule can be deployed in the following contexts:

This rule contains 7 string patterns in its detection logic.

False Positive Guidance

Original source: https://github.com/Yara-Rules/rules/blob/main/malware/MALW_Mirai.yar