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Linux.Bew Backdoor

yara LOW Yara-Rules
backdoorcommunity
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

The Linux.Bew Backdoor detection rule identifies potential adversary persistence by monitoring for suspicious file modifications and unusual process executions commonly associated with backdoor activity. SOC teams should proactively hunt for this behavior in Azure Sentinel to detect and mitigate early-stage compromise attempts by adversaries leveraging Linux-based systems.

YARA Rule

rule LinuxBew: MALW
{
	meta:
		description = "Linux.Bew Backdoor"
		author = "Joan Soriano / @w0lfvan"
		date = "2017-07-10"
		version = "1.0"
		MD5 = "27d857e12b9be5d43f935b8cc86eaabf"
		SHA256 = "80c4d1a1ef433ac44c4fe72e6ca42395261fbca36eff243b07438263a1b1cf06"
	strings:
		$a = "src/secp256k1.c"
		$b = "hfir.u230.org"
		$c = "tempfile-x11session"
	condition:
		all of them
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

This rule contains 3 string patterns in its detection logic.

False Positive Guidance

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