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EquationDrug - Filesystem filter driver – volrec.sys, scsi2mgr.sys

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: 2026-05-23T23:00:00Z · Confidence: medium

Hunt Hypothesis

The detection identifies potential adversary use of filesystem filter drivers like volrec.sys and scsi2mgr.sys, which are commonly associated with advanced persistent threats for persistence and data exfiltration. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify and mitigate early-stage malware activity that may evade traditional detection methods.

YARA Rule

rule EquationDrug_FileSystem_Filter 
{

    meta:
        description = "EquationDrug - Filesystem filter driver – volrec.sys, scsi2mgr.sys"
        author = "Florian Roth @4nc4p"
        reference = "http://securelist.com/blog/research/69203/inside-the-equationdrug-espionage-platform/"
        date = "2015/03/11"
        hash = "57fa4a1abbf39f4899ea76543ebd3688dcc11e13"

    strings:
        $s0 = "volrec.sys" fullword wide
        $s1 = "volrec.pdb" fullword ascii
        $s2 = "Volume recognizer driver" fullword wide

    condition:
        all of them
}

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_Equation.yar