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Internal names found in LURK0/CCTV0 samples

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: 2026-06-17T23:00:00Z · Confidence: medium

Hunt Hypothesis

Adversaries may use internal network names within malicious samples to evade detection or establish persistence. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify potential lateral movement or command and control activities.

YARA Rule

rule SharedStrings : Family {
	meta:
		description = "Internal names found in LURK0/CCTV0 samples"
		author = "Katie Kleemola"
		last_updated = "07-22-2014"
	
	strings:
		// internal names
		$i1 = "Butterfly.dll"
		$i2 = /\\BT[0-9.]+\\ButterFlyDLL\\/
		$i3 = "ETClientDLL"

		// dbx
		$d1 = "\\DbxUpdateET\\" wide
		$d2 = "\\DbxUpdateBT\\" wide
		$d3 = "\\DbxUpdate\\" wide
		
		// other folders
		$mc1 = "\\Micet\\"

		// embedded file names
		$n1 = "IconCacheEt.dat" wide
		$n2 = "IconConfigEt.dat" wide

		$m1 = "\x00\x00ERXXXXXXX\x00\x00" wide
		$m2 = "\x00\x00111\x00\x00" wide
		$m3 = "\x00\x00ETUN\x00\x00" wide
		$m4 = "\x00\x00ER\x00\x00" wide

	condition:
		any of them //todo: finetune this

}

Deployment Notes

This YARA rule can be deployed in the following contexts:

This rule contains 13 string patterns in its detection logic.

False Positive Guidance

Original source: https://github.com/Yara-Rules/rules/blob/main/malware/MALW_LURK0.yar