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Enfal code tricks

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: 2026-06-15T11:00:01Z · Confidence: medium

Hunt Hypothesis

Adversaries may use Enfal code tricks to obfuscate malicious activities, making detection through traditional methods challenging. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify and mitigate potential stealthy attacks that evade standard monitoring and logging mechanisms.

YARA Rule

rule EnfalCode : Enfal Family 
{
    meta:
        description = "Enfal code tricks"
        author = "Seth Hardy"
        last_modified = "2014-06-19"
        
    strings:
        // mov al, 20h; sub al, bl; add [ebx+esi], al; push esi; inc ebx; call edi; cmp ebx, eax
        $decrypt = { B0 20 2A C3 00 04 33 56 43 FF D7 3B D8 }
        
    condition:
        any 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/malware/MALW_Enfal.yar