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LuckyCat 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: 2026-06-19T23:00:00Z · Confidence: medium

Hunt Hypothesis

Adversaries may use obfuscated or encoded payloads in Azure environments to evade basic detection, leveraging code tricks to execute malicious commands without triggering standard security controls. SOC teams should proactively hunt for these patterns to identify potential stealthy attacks that bypass traditional detection mechanisms.

YARA Rule

rule LuckyCatCode : LuckyCat Family 
{
    meta:
        description = "LuckyCat code tricks"
        author = "Seth Hardy"
        last_modified = "2014-06-19"
        
    strings:
        $xordecrypt = { BF 0F 00 00 00 F7 F7 ?? ?? ?? ?? 32 14 39 80 F2 7B }
        $dll = { C6 ?? ?? ?? 64 C6 ?? ?? ?? 6C C6 ?? ?? ?? 6C }
        $commonletters = { B? 63 B? 61 B? 73 B? 65 }
        
    condition:
        $xordecrypt or ($dll and $commonletters)
}

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_LuckyCat.yar