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iexpl0re code features

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: 2026-06-16T11:00:00Z · Confidence: medium

Hunt Hypothesis

The rule detects potential adversary behavior involving the exploration of code features, which may indicate reconnaissance or initial compromise activities. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify early-stage threats and prevent further lateral movement or data exfiltration.

YARA Rule

rule iexpl0reCode : iexpl0ree Family 
{
    meta:
        description = "iexpl0re code features"
        author = "Seth Hardy"
        last_modified = "2014-07-21"
        
    strings:
        $ = { 47 83 FF 64 0F 8C 6D FF FF FF 33 C0 5F 5E 5B C9 C3 }
        $ = { 80 74 0D A4 44 41 3B C8 7C F6 68 04 01 00 00 }
        $ = { 8A C1 B2 07 F6 EA 30 04 31 41 3B 4D 10 7C F1 }
        $ = { 47 83 FF 64 0F 8C 79 FF FF FF 33 C0 5F 5E 5B C9 C3 }
        // 88h decrypt
        $ = { 68 88 00 00 00 68 90 06 00 00 68 ?? ?? ?? ?? 89 3? E8 }
        $ = { BB 88 00 00 00 53 68 90 06 00 00 68 ?? ?? ?? ?? 89 3? E8 }
        
    condition:
        any of them
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

False Positive Guidance

Original source: https://github.com/Yara-Rules/rules/blob/main/malware/MALW_Iexpl0ree.yar