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sphinx moth threat group file iastor32.exe

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: 2026-06-04T11:00:00Z · Confidence: medium

Hunt Hypothesis

The detection identifies potential malicious activity associated with the file iastor32.exe, which is linked to the Sphinx Moth threat group. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify and mitigate early-stage adversarial actions that may evade traditional detection methods.

YARA Rule

rule Sphinx_Moth_iastor32 
{ 

    meta:
        description = "sphinx moth threat group file iastor32.exe" 
        author = "Kudelski Security - Nagravision SA"
        reference = "www.kudelskisecurity.com"
        date = "2015-08-06"
   
    strings:
        $s0 = "MIIEpQIBAAKCAQEA4lSvv/W1Mkz38Q3z+EzJBZRANzKrlxeE6/UXWL67YtokF2nN" fullword ascii /* private key */
        $s1 = "iAeS3CCA4wli6+9CIgX8SAiXd5OezHvI1jza61z/flsqcC1IP//gJVt16nRx3s9z" fullword ascii /* private key */
   
    condition:
        uint16(0) == 0x5a4d and filesize < 2000KB and all of them
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

This rule contains 2 string patterns in its detection logic.

References

False Positive Guidance

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