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Ponmocup Installer

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: 2026-06-28T11:00:00Z · Confidence: medium

Hunt Hypothesis

This detection rule identifies the execution of the Ponmocup Installer, a legitimate software component that adversaries may leverage to establish persistence or mask malicious activity within Azure Sentinel environments. Proactively hunting for this behavior is essential because its low severity classification often leads to alert fatigue, allowing threat actors to exploit it as a trusted foothold before initiating more aggressive attack phases.

YARA Rule

rule Trj_Ponmocup {
        meta:
                author = "Centro Criptológico Nacional (CCN)"
                ref ="https://www.ccn-cert.cni.es/informes/informes-ccn-cert-publicos.html"
                description = "Ponmocup Installer"
        strings:
                $mz = { 4d 5a }
                $pac = { 48 8F BB 54 5F 3E 4F 4E }
                $unp = { 8B B8 7C 1F 46 00 33 C8 }
        condition:
                ($mz at 0) and ($pac at 0x61F7C) and ($unp at 0x29F0)
}

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

Here are 5 specific false positive scenarios for the Ponmocup Installer detection rule in an enterprise environment, along with suggested filters or exclusions:

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