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DJoinv07publicRC4encryptiondrmist

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: 2026-08-19T11:00:00Z · Confidence: medium

Hunt Hypothesis

This detection identifies potential legacy protocol vulnerabilities where adversaries exploit RC4 encryption weaknesses in public DJoin implementations to facilitate undetected lateral movement or data exfiltration. Proactive hunting for this behavior is essential within Azure Sentinel to uncover dormant threats leveraging outdated cryptographic standards that may evade standard signature-based defenses.

YARA Rule

rule DJoinv07publicRC4encryptiondrmist
{
      meta:
		author="malware-lu"
strings:
		$a0 = { C6 05 [2] 40 00 00 C6 05 [2] 40 00 00 [8] 00 [4] 00 [5] 00 }

condition:
		$a0 at pe.entry_point
}

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

Here are 5 specific false positive scenarios for the DJoinv07publicRC4encryptiondrmist rule, including suggested filters and exclusions tailored for an enterprise environment:

Original source: https://github.com/Yara-Rules/rules/blob/main/packers/packer.yar