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Iron Tiger Malware - HTTPBrowser Dropper

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: 2026-05-27T11:00:00Z · Confidence: medium

Hunt Hypothesis

The Iron Tiger Malware HTTPBrowser Dropper is likely being used to deliver payloads through browser-based HTTP requests, indicating potential lateral movement or data exfiltration. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify and mitigate early-stage malware activity before it leads to deeper network compromise.

YARA Rule

rule IronTiger_HTTPBrowser_Dropper 
{
   
    meta:
        author = "Cyber Safety Solutions, Trend Micro"
        description = "Iron Tiger Malware - HTTPBrowser Dropper"
        reference = "http://goo.gl/T5fSJC"
   
    strings:
        $str1 = ".dllUT" nocase wide ascii
        $str2 = ".exeUT" nocase wide ascii
        $str3 = ".urlUT" nocase wide ascii
   
    condition:
        uint16(0) == 0x5a4d and (2 of ($str*))
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

This rule contains 3 string patterns in its detection logic.

References

False Positive Guidance

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