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Mimikatz Wrapper used by attackers in Operation Cleaver

yara HIGH Yara-Rules
backdoorcommunitycredential-theft
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: 2026-05-31T23:00:00Z · Confidence: medium

Hunt Hypothesis

The Mimikatz Wrapper detected in this rule indicates adversaries are leveraging it to extract credentials as part of the Operation Cleaver campaign, enabling lateral movement and persistence within the network. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify and mitigate advanced persistent threats before they cause significant damage.

YARA Rule

rule OPCLEAVER_mimikatzWrapper
{

    meta:
        description = "Mimikatz Wrapper used by attackers in Operation Cleaver"
        reference = "http://cylance.com/assets/Cleaver/Cylance_Operation_Cleaver_Report.pdf"
        date = "2014/12/02"
        author = "Cylance Inc."
        score = "70"

    strings:
        $s1 = "mimikatzWrapper"
        $s2 = "get_mimikatz"

    condition:
        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_OPCleaver.yar