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Elex Installer

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: 2026-06-13T23:00:00Z · Confidence: medium

Hunt Hypothesis

The Elex Installer rule detects potential adversary behavior involving the execution of suspicious installer files that may be used to deploy malware or establish persistence. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify and mitigate early-stage threats that could evade traditional detection methods.

YARA Rule

rule Trj_Elex_Installer 
{

    meta:
        author = "Centro Criptológico Nacional (CCN)"
        description = "Elex Installer"
        ref = "https://www.ccn-cert.cni.es/informes/informes-ccn-cert-publicos.html"
        
    strings:
        $mz = { 4d 5a }
        $str1 = {65 00 76 00 65 00 72 00 79 00 74 00 68 00 69 00 6e 00 67 00}
        $str2 = "IsWow64Process"
        $str3 = "SSFK"
        
    condition:
        ($mz at 0) and ($str1) and ($str2) and ($str3)
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

This rule contains 4 string patterns in its detection logic.

False Positive Guidance

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