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Detects a possible .eml used in the Ukraine BE power attack

yara LOW Yara-Rules
community
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: 2026-05-09T23:00:01Z · Confidence: medium

Hunt Hypothesis

Adversaries may use .eml files to exfiltrate data or execute malicious payloads, mimicking legitimate email traffic. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify potential indicators of compromise linked to advanced persistent threats.

YARA Rule

rule email_Ukraine_power_attack_attachment : mail {
	meta:
		author = " @yararules"
		description = "Detects a possible .eml used in the Ukraine BE power attack"
		ref1 = "https://twitter.com/lowcalspam/status/692625258394726400"

	strings:
		$filename = "filename=\"=?windows-1251?B?xO7k4PLu6jEueGxz?=\""
		
		condition:
		all of them
}

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/email/email_Ukraine_BE_powerattack.yar