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ARP cache poisoner used by attackers in Operation Cleaver

yara HIGH Yara-Rules
backdoorcommunity
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

Attackers in Operation Cleaver are likely using ARP cache poisoning to intercept and manipulate network traffic, enabling lateral movement and data exfiltration. Proactively hunting for this behavior in Azure Sentinel can help identify early-stage network compromise and prevent further damage within the environment.

YARA Rule

rule OPCLEAVER_Jasus
{

    meta:
        description = "ARP cache poisoner 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 = "pcap_dump_open"
        $s2 = "Resolving IPs to poison..."
        $s3 = "WARNNING: Gateway IP can not be found"

    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_OPCleaver.yar